iOS 浏览相册功能实现 —— HERO博客
2024-04-10 03:35:45
iOS 浏览相册功能实现，可缩放，画笔标记，缓存图片，记录下载进度。
首先看一下效果图：
下面简述下主要思路及相关代码：
HWPhotoVC（控制器，用collcetView展示缩略图，点击cell展示大图片）：
#import <UIKit/UIKit.h>@interface HWPhotoVC : UIViewController@end/*** ---------------分割线--------------- ***/#import "HWPhotoVC.h"
#import "HWPhotoView.h"
#import "HWNavBar.h"
#import "HWLoadingView.h"
#import "HWPhotoManger.h"#define KItemW 111
#define KItemH 111
#define KMargin 10@interface HWPhotoVC ()<UICollectionViewDelegate, UICollectionViewDataSource>@property (nonatomic, strong) NSArray *photos;
@property (nonatomic, strong) NSArray *thumPhotos;
@property (nonatomic, strong) UICollectionView *collectionView;
@property (nonatomic, weak) HWPhotoView *photoView;
@property (nonatomic, weak) HWLoadingView *loadingView;@end@implementation HWPhotoVCstatic NSString *const reuseIdentifier = @"HWPhotosCell";- (void)viewDidLoad {[super viewDidLoad];self.view.backgroundColor = [UIColor whiteColor];//创建控件[self creatControl];
}- (void)creatControl
{CGFloat navBarH = 64.0f;//导航条HWNavBar *navBar = [[HWNavBar alloc] initWithFrame:CGRectMake(0, 0, KMainW, navBarH)];navBar.title = @"相册";[navBar addBackButtonWithAction:@selector(photoVCBackAction)];[self.view addSubview:navBar];//展示视图布局UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];flowLayout.sectionInset = UIEdgeInsetsMake(KMargin, KMargin, KMargin, KMargin);//展示视图_collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, navBarH, KMainW, KMainH - navBarH) collectionViewLayout:flowLayout];_collectionView.backgroundColor = [UIColor clearColor];_collectionView.showsVerticalScrollIndicator = NO;_collectionView.dataSource = self;_collectionView.delegate = self;[self.view addSubview:_collectionView];//加载视图HWLoadingView *loadingView = [[HWLoadingView alloc] initWithFrame:CGRectMake(0, 0, KMainW, KMainH)];loadingView.progress = 0.0f;weakify(self);loadingView.back = ^() {strongify(weakSelf);[strongSelf photoVCBackAction];};[self.view addSubview:loadingView];self.loadingView = loadingView;//注册标识[_collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:reuseIdentifier];//获取信息[self getInfo];
}- (HWPhotoView *)photoView
{if (!_photoView) {HWPhotoView *photoView = [[HWPhotoView alloc] initWithFrame:CGRectMake(0, 0, KMainW, KMainH)];photoView.photos = _photos;photoView.thumPhotos = _thumPhotos;weakify(self);photoView.back = ^(CGRect imageViewFrame, NSInteger item) {strongify(weakSelf);[strongSelf photoDismissAnimationWithFrame:imageViewFrame item:item];};[self.view addSubview:photoView];_photoView = photoView;}return _photoView;
}- (void)photoDismissAnimationWithFrame:(CGRect)frame item:(NSInteger)item
{//根据item宽度计算每行可显示的个数int colCount = (int)((KMainW - KMargin) / (KItemW + KMargin));//创建图片并设置初始frameUIImageView __block *imageView = [[UIImageView alloc] initWithFrame:frame];imageView.image = [UIImage imageWithContentsOfFile:[HWPhotoManger getImagePathWithImageName:_photos[item]]];[self.view addSubview:imageView];//点击图片时左上第一张是否能完整显示BOOL isIntact = (int)_collectionView.contentOffset.y % (KMargin + KItemH) <= KMargin;//点击图片时左下第一张是否能完整显示BOOL isIntactBottom = (int)(_collectionView.contentOffset.y + _collectionView.bounds.size.height) % (KMargin + KItemH) <= KMargin;//点击图片时左上第一张图片itemNSInteger currentFirstItem = (int)_collectionView.contentOffset.y / (KMargin + KItemH) * colCount;//点击图片时左下第一张图片itemNSInteger currentBottomFirstItem = (int)(_collectionView.contentOffset.y + _collectionView.bounds.size.height) / (KMargin + KItemH) * colCount;if (isIntactBottom) currentBottomFirstItem = currentBottomFirstItem - colCount;//视图可以展示的最大item数量NSInteger showMaxItemCount = currentBottomFirstItem - currentFirstItem + colCount;//当结束点击图片在最上一行，并且图片不能完整显示时，下移CollectionView使图片完整显示if (!isIntact && (item - currentFirstItem < colCount && item - currentFirstItem > - 1)) {[_collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:item inSection:0] atScrollPosition:UICollectionViewScrollPositionTop animated:NO];}//当结束点击图片在最下一行，并且图片不能完整显示时，上移CollectionView使图片完整显示if (!isIntactBottom && (item - currentFirstItem > showMaxItemCount - colCount - 1 && item - currentFirstItem < showMaxItemCount)) {CGFloat movePadding = KItemH - ((int)(_collectionView.contentOffset.y + _collectionView.bounds.size.height) % (KItemH + KMargin) - KMargin);[_collectionView setContentOffset:CGPointMake(0, _collectionView.contentOffset.y + movePadding)];}//当结束点击item小于左上第一张图片时，下移CollectionView至选中行为最上一行if (item < currentFirstItem) {[_collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:item inSection:0] atScrollPosition:UICollectionViewScrollPositionTop animated:NO];}//当结束点击item大于右下（左上第一张图片item + 可最大展示item数）时，上移CollectionView至选中行为最下一行if (item > currentFirstItem + showMaxItemCount - 1) {CGFloat movePadding = KItemH - ((int)(_collectionView.contentOffset.y + _collectionView.bounds.size.height) % (KItemH + KMargin) - KMargin) + (KItemH + KMargin) * (item / colCount - currentBottomFirstItem / colCount);if (isIntactBottom) movePadding = movePadding - (KItemH + KMargin);[_collectionView setContentOffset:CGPointMake(0, _collectionView.contentOffset.y + movePadding)];}//加延时确保获取到的cellFrame是collectionView移动之后的dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{//获取图片缩小后的frameUICollectionViewCell *cell = [_collectionView cellForItemAtIndexPath:[NSIndexPath indexPathForItem:item inSection:0]];//消失动画[UIView animateWithDuration:0.25f animations:^{imageView.frame = [self.view convertRect:cell.frame fromView:_collectionView];}completion:^(BOOL finished) {[imageView removeFromSuperview];imageView = nil;}];});
}- (void)getInfo
{[_loadingView show];//网络请求获取相册相关信息这里省略了，直接模拟获取到图片数组、缩略图数组、相册版本号、相册idNSArray *urlArray = @[@"http://a2.qpic.cn/psb?/V13GwxkT2AqZnq/axUD1TxyazB3vSFQkDQLn5M0QPSZQB5WWLaDW0V5Xj4!/b/dGkBAAAAAAAA&bo=cQSAAgAAAAAFB9M!&rf=viewer_4", @"http://a2.qpic.cn/psb?/V13GwxkT2AqZnq/D0m2YadD0efgMEFUzxDI.VP54dmoNLE6jXG4q3Hu39Q!/b/dGkBAAAAAAAA&bo=AASAAgAAAAAFB6I!&rf=viewer_4", @"http://a2.qpic.cn/psb?/V13GwxkT2AqZnq/ajOssbYw05gPzrifwEeHYJQm63nINjpnDNk3lXV7utQ!/b/dGkBAAAAAAAA&bo=cgSAAgAAAAAFANc!&rf=viewer_4", @"http://a1.qpic.cn/psb?/V13GwxkT2AqZnq/Y2bx7nPZOo*xK9CnWnEuMOIvnAOeMDLnvFGuE325tSg!/b/dGgBAAAAAAAA&bo=FQIsAQAAAAAFABk!&rf=viewer_4", @"http://a1.qpic.cn/psb?/V13GwxkT2AqZnq/yJZVj17bdMMR3sCLT1YWwNFKgK057vNjw0zL1IH6FTg!/b/dGgBAAAAAAAA&bo=4AEsAQAAAAAFAO8!&rf=viewer_4", @"http://a1.qpic.cn/psb?/V13GwxkT2AqZnq/HJUjYRFTxYElxuIP00GzRWHoymfiyylKmisGK9gbDUc!/b/dGgBAAAAAAAA&bo=VQOAAgAAAAAFAPc!&rf=viewer_4", 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getPhotoVersionKeyWithPhotoID:photoID]];//如果有本地缓存if ([newVersion isEqualToString:currentVersion]) {//取本地图片_photos = [NSKeyedUnarchiver unarchiveObjectWithFile:[HWPhotoManger getPhotoPathWithPhotoID:photoID]];_thumPhotos = [NSKeyedUnarchiver unarchiveObjectWithFile:[HWPhotoManger getThumPhotoPathWithPhotoID:photoID]];//刷新[_loadingView dismiss];[_collectionView reloadData];//如果没有本地缓存}else {HWPhotoManger *photoManger = [HWPhotoManger sharePhotoManger];//加载图片if (!photoManger.isLoading) {[photoManger getImageWithUrlArray:urlArray thumUrlArray:thumUrlArray photoID:photoID version:newVersion];}else {_loadingView.progress = photoManger.progress;}//加载失败photoManger.error = ^() {NSLog(@"加载失败，请检查网络");dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{[self photoVCBackAction];});};//刷新进度photoManger.progressBlock = ^(CGFloat progress) {_loadingView.progress = progress;};//刷新视图photoManger.finishBlock = ^(NSArray *array, NSArray *thumArray) {_photos = array;_thumPhotos = thumArray;[_loadingView dismiss];[_collectionView reloadData];};}
}- (void)photoVCBackAction
{[self dismissViewControllerAnimated:YES completion:nil];
}#pragma mark - UICollectionViewDataSource
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{return _thumPhotos.count;
}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:[HWPhotoManger getImagePathWithImageName:_thumPhotos[indexPath.item]]]];return cell;
}- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{return CGSizeMake(KItemW, KItemH);
}#pragma mark - UICollectionViewDelegate
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];CGRect selectPhotoFrame = [self.view convertRect:cell.frame fromView:collectionView];[self.photoView showWithSelectPhotoFrame:selectPhotoFrame selectItem:indexPath.item];
}@end
HWPhotoView（图片展示视图，用scrollView做为容器展示图片，设置缩放、点击、滑动事件，添加了一个collectionView做为快速浏览视图，画笔功能是添加了一个空视图覆盖在图片上，并未与图片融合）：
#import <UIKit/UIKit.h>@interface HWPhotoView : UIView@property (nonatomic, strong) NSArray *photos;
@property (nonatomic, strong) NSArray *thumPhotos;
@property (nonatomic, copy) void(^ back)(CGRect imageFrame, NSInteger item);- (void)showWithSelectPhotoFrame:(CGRect)selectPhotoFrame selectItem:(NSInteger)selectItem;@end/*** ---------------分割线--------------- ***/#import "HWPhotoView.h"
#import "HWPaintView.h"
#import "HWPaintBar.h"
#import "HWPhotoManger.h"
#import "HWNavBar.h"#define KHWPhotoViewMargin 2
#define KCollectionViewHeigth 100
#define KPicMinScale 1.0
#define KPicMaxScale 2.4
#define KItemW 70
#define KItemH 96@interface HWPhotoView ()<UICollectionViewDelegate, UICollectionViewDataSource, UIScrollViewDelegate, HWPaintBarDelegate>@property (nonatomic, weak) UILabel *label;
@property (nonatomic, weak) UIImageView *imageView;
@property (nonatomic, weak) UIScrollView *scrollView;
@property (nonatomic, weak) HWNavBar *navBar;
@property (nonatomic, weak) HWPaintView *paintView;
@property (nonatomic, weak) HWPaintBar *paintBar;
@property (nonatomic, strong) UICollectionView *collectionView;
@property (nonatomic, assign) NSInteger index;
@property (nonatomic, assign) CGFloat startCollectionViewX;
@property (nonatomic, assign) CGFloat lastScrContX;@end@implementation HWPhotoViewstatic NSString *const reuseIdentifier = @"HWPhotoViewCell";- (instancetype)initWithFrame:(CGRect)frame
{if (self = [super initWithFrame:frame]) {self.backgroundColor = [UIColor blackColor];//容器UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];scrollView.minimumZoomScale = KPicMinScale;scrollView.maximumZoomScale = KPicMaxScale;scrollView.showsVerticalScrollIndicator = NO;scrollView.showsHorizontalScrollIndicator = NO;scrollView.delegate = self;[self addSubview:scrollView];self.scrollView = scrollView;//单击UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(click)];tap.numberOfTouchesRequired = 1;tap.numberOfTapsRequired = 1;[scrollView addGestureRecognizer:tap];//双击UITapGestureRecognizer *tap2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleClick)];tap2.numberOfTapsRequired = 2;[scrollView addGestureRecognizer:tap2];[tap requireGestureRecognizerToFail:tap2];//右滑手势UISwipeGestureRecognizer *rightSwip = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(nextPage)];rightSwip.direction = UISwipeGestureRecognizerDirectionLeft;[scrollView addGestureRecognizer:rightSwip];//左滑手势UISwipeGestureRecognizer *leftSwip = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(forwardPage)];leftSwip.direction = UISwipeGestureRecognizerDirectionRight;[scrollView addGestureRecognizer:leftSwip];//下滑手势UISwipeGestureRecognizer *downSwip = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(downSwipAction)];downSwip.direction = UISwipeGestureRecognizerDirectionDown;[scrollView addGestureRecognizer:downSwip];//图片UIImageView *imageView = [[UIImageView alloc] init];[self.scrollView addSubview:imageView];self.imageView = imageView;//手绘板HWPaintView *paintView = [[HWPaintView alloc] initWithFrame:self.bounds];paintView.hidden = YES;[self addSubview:paintView];self.paintView = paintView;//导航条HWNavBar *navBar = [[HWNavBar alloc] initWithFrame:CGRectMake(0, 0, KMainW, 64)];navBar.title = @"相册";[navBar addBackButtonWithAction:@selector(photoViewBackAction)];[self addSubview:navBar];self.navBar = navBar;//开启手绘按钮UIButton *paintBtn = [[UIButton alloc] initWithFrame:CGRectMake(KMainW - 95, 20, 80, 44)];paintBtn.selected = YES;[paintBtn setTitle:@"显示画笔" forState:UIControlStateNormal];[paintBtn setTitle:@"隐藏画笔" forState:UIControlStateSelected];[paintBtn addTarget:self action:@selector(paintBtnOnClick:) forControlEvents:UIControlEventTouchUpInside];[navBar addSubview:paintBtn];//画笔工具条HWPaintBar *paintBar = [[HWPaintBar alloc] initWithFrame:CGRectMake(KMainW - 60, 80, 44, 412)];paintBar.delegate = self;[self addSubview:paintBar];self.paintBar = paintBar;//布局UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;layout.minimumLineSpacing = KHWPhotoViewMargin;layout.sectionInset = UIEdgeInsetsMake(KHWPhotoViewMargin, KHWPhotoViewMargin, KHWPhotoViewMargin, KHWPhotoViewMargin);//浏览条_collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, KMainH - KCollectionViewHeigth, KMainW, KCollectionViewHeigth) collectionViewLayout:layout];_collectionView.backgroundColor = [UIColor colorWithHexString:@"003c65"];_collectionView.dataSource = self;_collectionView.delegate = self;[self addSubview:_collectionView];//注册标识[_collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:reuseIdentifier];}return self;
}//左滑事件
- (void)nextPage
{if (_index < _photos.count - 1) {_index ++;//当滑动展示视图超出展示范围，未选中时进行翻页，先恢复到原位置[_collectionView setContentOffset:CGPointMake(_startCollectionViewX, 0)];//滑动时展示图最右边图片是否能完全显示BOOL isIntactRight = (int)(_collectionView.contentOffset.x + KMainW) % (KHWPhotoViewMargin + KItemW) <= KHWPhotoViewMargin;//滑动时展示图最右边图片itemNSInteger currentRightItem = (int)(_collectionView.contentOffset.x + KMainW) / (KHWPhotoViewMargin + KItemW);if (isIntactRight) currentRightItem--;//如果最右边item不能完全显示，并滑动到该item，左移视图至item完全显示if (!isIntactRight && _index == currentRightItem) {CGFloat movePadding = KItemW - ((int)(_collectionView.contentOffset.x + KMainW) % (KItemW + KHWPhotoViewMargin) - KHWPhotoViewMargin);[_collectionView setContentOffset:CGPointMake(_collectionView.contentOffset.x + movePadding, 0)];}//如果滑动超出展示视图最大item，左移视图至item显示if (_index > currentRightItem) {CGFloat movePadding = KItemW - ((int)(_collectionView.contentOffset.x + KMainW) % (KItemW + KHWPhotoViewMargin) - KHWPhotoViewMargin) + (KItemW + KHWPhotoViewMargin);if (isIntactRight) movePadding = movePadding - (KItemW + KHWPhotoViewMargin);[_collectionView setContentOffset:CGPointMake(_collectionView.contentOffset.x + movePadding, 0)];}//刷新视图[self reloadPhotoView];[self transitionWithType:@"pageCurl" WithSubtype:kCATransitionFromRight ForView:self];}else {NSLog(@"已经是最后一页了");}
}//右滑事件
- (void)forwardPage
{if (_index > 0) {_index --;//当滑动展示视图超出展示范围，未选中时进行翻页，先恢复到原位置[_collectionView setContentOffset:CGPointMake(_startCollectionViewX, 0)];//滑动时展示图最左边图片是否能完全显示BOOL isIntactLeft = (int)_collectionView.contentOffset.x % (KHWPhotoViewMargin + KItemW) <= KHWPhotoViewMargin;//滑动时展示图最左边图片itemNSInteger currentLeftItem = (int)_collectionView.contentOffset.x / (KHWPhotoViewMargin + KItemW);//如果最左边item不能完全显示，并滑动到该item，右移视图至item完全显示if (!isIntactLeft && _index == currentLeftItem) {CGFloat movePadding = (int)_collectionView.contentOffset.x % (KItemW + KHWPhotoViewMargin);[_collectionView setContentOffset:CGPointMake(_collectionView.contentOffset.x - movePadding, 0)];}//如果滑动超出展示视图最小item，右移视图至item显示if (_index < currentLeftItem) {CGFloat movePadding = (int)_collectionView.contentOffset.x % (KItemW + KHWPhotoViewMargin) + (KItemW + KHWPhotoViewMargin);[_collectionView setContentOffset:CGPointMake(_collectionView.contentOffset.x - movePadding, 0)];}//刷新视图[self reloadPhotoView];[self transitionWithType:@"pageUnCurl" WithSubtype:kCATransitionFromRight ForView:self];}else {NSLog(@"已经是第一页了");}
}//下滑事件
- (void)downSwipAction
{[self dismiss];[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];if (_back) _back(_imageView.frame, _index);
}//更新视图信息
- (void)reloadPhotoView
{dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{[self reloadSelectItem];});_scrollView.zoomScale = KPicMinScale;_imageView.image = [UIImage imageWithContentsOfFile:[HWPhotoManger getImagePathWithImageName:_photos[_index]]];[self setImageViewFrame];_label.text = [NSString stringWithFormat:@"%ld / %ld", _index + 1, _photos.count];
}//更新展示视图选中项
- (void)reloadSelectItem
{_startCollectionViewX = _collectionView.contentOffset.x;UICollectionViewCell *cell;for (int i = 0; i < _photos.count; i++) {cell = [_collectionView cellForItemAtIndexPath:[NSIndexPath indexPathForItem:i inSection:0]];cell.backgroundView.layer.borderWidth = i == _index ? 5.0f : 0.0f;}
}//设置翻页动画效果
- (void)transitionWithType:(NSString *)type WithSubtype:(NSString *)subtype ForView:(UIView *)view
{CATransition *animation = [CATransition animation];animation.duration = 0.7f;animation.type = type;if (subtype != nil) {animation.subtype = subtype;}animation.timingFunction = UIViewAnimationOptionCurveEaseInOut;[view.layer addAnimation:animation forKey:@"animation"];
}//单击屏幕显示隐藏菜单
- (void)click
{if (_navBar.hidden == YES) {_navBar.hidden = NO;_collectionView.hidden = NO;[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];}else {_navBar.hidden = YES;_collectionView.hidden = YES;[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];}
}//双击屏幕放大缩小图片
- (void)doubleClick
{[UIView animateWithDuration:0.25f animations:^{_scrollView.zoomScale = _scrollView.zoomScale == KPicMinScale ? KPicMaxScale : KPicMinScale;}];
}//返回按钮点击事件
- (void)photoViewBackAction
{[self dismiss];if (_back) _back(_imageView.frame, _index);
}//开启编辑按钮点击事件
- (void)paintBtnOnClick:(UIButton *)btn
{btn.selected = !btn.selected;_paintBar.hidden = !btn.selected;
}//显示
- (void)showWithSelectPhotoFrame:(CGRect)selectPhotoFrame selectItem:(NSInteger)selectItem
{self.hidden = NO;_index = selectItem;_label.text = [NSString stringWithFormat:@"%ld / %ld", _index + 1, _photos.count];[_collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:_index inSection:0] atScrollPosition:UICollectionViewScrollPositionLeft animated:NO];dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{[self reloadSelectItem];});_imageView.image = [UIImage imageWithContentsOfFile:[HWPhotoManger getImagePathWithImageName:_photos[_index]]];_imageView.frame = selectPhotoFrame;[UIView animateWithDuration:0.25f animations:^{[self setImageViewFrame];}];
}//更新图片frame
- (void)setImageViewFrame
{CGRect frame = _imageView.frame;frame.size.width = _imageView.image.size.width > KMainW ? KMainW : _imageView.image.size.width;frame.size.height = frame.size.width * (_imageView.image.size.height / _imageView.image.size.width);if (frame.size.height > KMainH) {frame.size.height = KMainH;frame.size.width = KMainH * (_imageView.image.size.width / _imageView.image.size.height);}frame.origin.x = (KMainW - frame.size.width) * 0.5;frame.origin.y = (KMainH - frame.size.height) * 0.5;_imageView.frame = frame;
}//隐藏
- (void)dismiss
{_scrollView.zoomScale = KPicMinScale;self.hidden = YES;
}#pragma mark - HWPaintBarDelegate
- (void)didClickClearBtnInHWPaintBar:(HWPaintBar *)paintBar
{[_paintView clear];
}- (void)didClickCancelBtnInHWPaintBar:(HWPaintBar *)paintBar
{[_paintView cancel];
}- (void)paintBar:(HWPaintBar *)paintBar didClickBrushBtnWithState:(BOOL)isOpen
{_paintView.hidden = !isOpen;if (!isOpen) [_paintView clear];
}- (void)paintBar:(HWPaintBar *)paintBar didClickStateBtnWithState:(int)state
{_paintView.lineState = state;
}- (void)paintBar:(HWPaintBar *)paintBar didClickColorBtnWithColor:(UIColor *)color
{_paintView.lineColor = color;
}#pragma mark - UICollectionViewDataSource
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{return _thumPhotos.count;
}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageWithContentsOfFile:[HWPhotoManger getImagePathWithImageName:_thumPhotos[indexPath.item]]]];cell.backgroundView.layer.borderColor = [[UIColor colorWithHexString:@"#00BFFF"] CGColor];if (indexPath.item == _index) cell.backgroundView.layer.borderWidth = 5.0f;return cell;
}- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{return CGSizeMake(KItemW, KItemH);
}- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{_index = indexPath.item;[_paintView clear];[self reloadPhotoView];
}#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{CGFloat offsetX = (scrollView.bounds.size.width > scrollView.contentSize.width) ? (scrollView.bounds.size.width - scrollView.contentSize.width) * 0.5 : 0.0;CGFloat offsetY = (scrollView.bounds.size.height > scrollView.contentSize.height) ? (scrollView.bounds.size.height - scrollView.contentSize.height) * 0.5 : 0.0;self.imageView.center = CGPointMake(scrollView.contentSize.width * 0.5 + offsetX, scrollView.contentSize.height * 0.5 + offsetY);
}- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{return self.imageView;
}- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{if (scrollView.isZooming) return;//设置允许翻页的偏移量CGFloat movePadding = 70;//仿苹果原生相册，图片放大后，滑动前在边界时才允许翻页，这里加了±10的偏移量if (scrollView.contentOffset.x < - movePadding && self.lastScrContX < 10) {_scrollView.zoomScale = KPicMinScale;[self forwardPage];}if (scrollView.contentSize.width - scrollView.contentOffset.x < KMainW - movePadding && scrollView.contentSize.width != 0 && fabs(self.lastScrContX + KMainW - scrollView.contentSize.width) < 10) {_scrollView.zoomScale = KPicMinScale;[self nextPage];}
}//滑动自然停止时调用
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{//记录滑动停止时的偏移量self.lastScrContX = scrollView.contentOffset.x;
}//滑动手动停止时调用
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{self.lastScrContX = scrollView.contentOffset.x;
}@end
HWPaintView（绘画视图）：
#import <UIKit/UIKit.h>typedef enum {HWPaintLineStateNormal = 0,HWPaintLineStateLight,
} HWPaintLineState;@interface HWPaintView : UIView@property (nonatomic, assign) HWPaintLineState lineState;
@property (nonatomic, strong) UIColor *lineColor;- (void)clear;
- (void)cancel;@end/*** ---------------分割线--------------- ***/#import "HWPaintView.h"@interface HWPaintView ()@property (nonatomic, strong) NSMutableArray *paths;@end@implementation HWPaintView- (NSMutableArray *)paths
{if (!_paths) {_paths = [NSMutableArray array];}return _paths;
}- (instancetype)initWithFrame:(CGRect)frame
{if (self = [super initWithFrame:frame]) {self.backgroundColor = [UIColor clearColor];self.lineColor = [UIColor colorWithHexString:@"#fa4d32"];}return self;
}- (void)clear
{[self.paths removeAllObjects];[self setNeedsDisplay];
}- (void)cancel
{[self.paths removeLastObject];[self setNeedsDisplay];
}- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{UITouch *touch = [touches anyObject];CGPoint startPoint = [touch locationInView:touch.view];UIBezierPath *path = [UIBezierPath bezierPath];path.lineCapStyle = kCGLineCapRound;path.lineJoinStyle = kCGLineJoinRound;path.lineWidth = 5;[path moveToPoint:startPoint];[path addLineToPoint:startPoint];[self.paths addObject:path];[self setNeedsDisplay];
}- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{UITouch *touch = [touches anyObject];CGPoint currentPoint = [touch locationInView:touch.view];UIBezierPath *path = [self.paths lastObject];[path addLineToPoint:currentPoint];[self setNeedsDisplay];
}- (void)drawRect:(CGRect)rect
{for (UIBezierPath *path in self.paths) {if (self.lineState == HWPaintLineStateNormal) {[self.lineColor set];}else if (self.lineState == HWPaintLineStateLight) {[[UIColor whiteColor] set];CGContextSetShadowWithColor(UIGraphicsGetCurrentContext(), CGSizeMake(0, 0), 8, [self.lineColor CGColor]);}[path stroke];}
}@end
HWPhotoManger（图片加载缓存管理类，在这里获取图片、路径、进度）：
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>@interface HWPhotoManger : NSObject@property (nonatomic, copy) void(^progressBlock)(CGFloat progress);
@property (nonatomic, copy) void(^finishBlock)(NSArray *array, NSArray *thumArray);
@property (nonatomic, copy) void(^error)();
@property (nonatomic, assign, readonly) BOOL isLoading;
@property (nonatomic, assign) CGFloat progress;+ (instancetype)sharePhotoManger;
+ (NSString *)getPhotoVersionKeyWithPhotoID:(NSString *)photoID;
+ (NSString *)getPhotoPathWithPhotoID:(NSString *)photoID;
+ (NSString *)getThumPhotoPathWithPhotoID:(NSString *)photoID;
+ (NSString *)getImagePathWithImageName:(NSString *)imageName;
- (void)getImageWithUrlArray:(NSArray *)urlArray thumUrlArray:(NSArray *)thumUrlArray photoID:(NSString *)photoID version:(NSString *)version;@end/*** ---------------分割线--------------- ***/#import "HWPhotoManger.h"#define KPhotoCachesPath [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]@interface HWPhotoManger ()@property (nonatomic, assign, readwrite) BOOL isLoading;@end@implementation HWPhotoManger+ (instancetype)sharePhotoManger
{static HWPhotoManger *instance;static dispatch_once_t onceToken;dispatch_once(&onceToken, ^{instance = [[self alloc] init];});return instance;
}- (void)getImageWithUrlArray:(NSArray *)urlArray thumUrlArray:(NSArray *)thumUrlArray photoID:(NSString *)photoID version:(NSString *)version
{_isLoading = YES;if (_progressBlock == nil) _progressBlock = ^(CGFloat progress) {};if (_finishBlock == nil) _finishBlock = ^(NSArray *array, NSArray *thumArray) {};if (_error == nil) _error = ^(){};NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];NSString *versionKey = [NSString stringWithFormat:@"photosVersionKey%@", photoID];//本地相册路径（原图）NSString *photoName = [@"HWPhotosCache" stringByAppendingString:photoID];NSString *photoPath = [KPhotoCachesPath stringByAppendingPathComponent:photoName];//本地相册路径（缩略图）NSString *thumPhotoName = [@"HWThumPhotosCache" stringByAppendingString:photoID];NSString *thumPhotoPath = [KPhotoCachesPath stringByAppendingPathComponent:thumPhotoName];NSMutableArray *temArr = [NSMutableArray array];NSMutableArray *thumTemArr = [NSMutableArray array];__block int i = 0;weakify(self);dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{strongify(weakSelf);for (NSString *url in urlArray) {//加载图片（这个方式并不好）UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:url]]];if (image == nil) {dispatch_async(dispatch_get_main_queue(), ^{strongSelf.error();strongSelf.isLoading = NO;strongSelf.progress = 0;});return;}//将图片保存到本地NSString *imageName = [NSString stringWithFormat:@"%@image%d", photoName, i];NSString *iamgePath = [KPhotoCachesPath stringByAppendingPathComponent:imageName];[UIImagePNGRepresentation(image) writeToFile:iamgePath atomically:YES];[temArr addObject:imageName];UIImage *thumImage = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:thumUrlArray[i++]]]];if (thumImage == nil) {dispatch_async(dispatch_get_main_queue(), ^{strongSelf.error();strongSelf.isLoading = NO;strongSelf.progress = 0;});return;}NSString *thumImageName = [NSString stringWithFormat:@"%@thumImage%d", thumPhotoName, i];NSString *thumIamgePath = [KPhotoCachesPath stringByAppendingPathComponent:thumImageName];[UIImagePNGRepresentation(thumImage) writeToFile:thumIamgePath atomically:YES];[thumTemArr addObject:thumImageName];dispatch_async(dispatch_get_main_queue(), ^{strongSelf.progress = (CGFloat)thumTemArr.count / urlArray.count;strongSelf.progressBlock(strongSelf.progress);if (urlArray.count == thumTemArr.count) {strongSelf.finishBlock(temArr, thumTemArr);strongSelf.isLoading = NO;strongSelf.progress = 0;//保存[defaults setObject:version forKey:versionKey];[NSKeyedArchiver archiveRootObject:temArr toFile:photoPath];[NSKeyedArchiver archiveRootObject:thumTemArr toFile:thumPhotoPath];}});}});
}+ (NSString *)getPhotoVersionKeyWithPhotoID:(NSString *)photoID
{return [NSString stringWithFormat:@"photosVersionKey%@", photoID];
}+ (NSString *)getPhotoPathWithPhotoID:(NSString *)photoID
{return [KPhotoCachesPath stringByAppendingPathComponent:[@"HWPhotosCache" stringByAppendingString:photoID]];
}+ (NSString *)getThumPhotoPathWithPhotoID:(NSString *)photoID
{return [KPhotoCachesPath stringByAppendingPathComponent:[@"HWThumPhotosCache" stringByAppendingString:photoID]];
}+ (NSString *)getImagePathWithImageName:(NSString *)imageName
{return [KPhotoCachesPath stringByAppendingPathComponent:imageName];
}@end
还有几个自定义的视图不贴出来了。
相册Demo下载链接：http://code.cocoachina.com/view/134624
写博客的初心是希望大家共同交流成长，博主水平有限难免有偏颇之处，欢迎批评指正。
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