iOS 图片碎片化轮播

在项目中，常常用到轮播图，我们常常会想到用UIScrollView来实现。但是还有很多较高大上的方法，效果也更加炫酷。比如下面将要说的碎片化轮播。

效果类似现实中广告牌的翻转效果，如图

实际上是两层view在交替显示，所以先要一个TranformFadeView类，实现翻转的翻转碎片化的效果，翻转时间，碎片宽度的等..

TranformFadeView.h

#import <UIKit/UIKit.h>@interface TranformFadeView : UIView/***  Image显示方式*/
@property (nonatomic) UIViewContentMode  contentMode;/***  要显示的相片*/
@property (nonatomic, strong) UIImage   *image;/***  垂直方向方块的个数*/
@property (nonatomic) NSInteger          verticalCount;/***  水平的个数*/
@property (nonatomic) NSInteger          horizontalCount;/***  开始构造出作为mask用的view*/
- (void)buildMaskView;/***  渐变动画的时间*/
@property (nonatomic) NSTimeInterval     fadeDuradtion;/***  两个动画之间的时间间隔*/
@property (nonatomic) NSTimeInterval     animationGapDuration;/***  开始隐藏动画**  @param animated 是否执行动画*/
- (void)fadeAnimated:(BOOL)animated;/***  开始显示动画**  @param animated 时候执行动画*/
- (void)showAnimated:(BOOL)animated;@end

TranformFadeView.m

#import "TranformFadeView.h"typedef enum : NSUInteger {kSubViewTag = 0x1000,} ETranformFadeViewValue;@interface TranformFadeView ()/***  图片*/
@property (nonatomic, strong) UIImageView    *imageView;/***  所有的maskView*/
@property (nonatomic, strong) UIView         *allMaskView;/***  maskView的个数*/
@property (nonatomic)         NSInteger       maskViewCount;/***  存储maskView的编号*/
@property (nonatomic, strong) NSMutableArray *countArray;@end@implementation TranformFadeView/***  初始化并添加图片**  @param frame frame值*/
- (void)initImageViewWithFrame:(CGRect)frame {self.imageView                     = [[UIImageView alloc] initWithFrame:frame];self.imageView.layer.masksToBounds = YES;[self addSubview:self.imageView];
}- (instancetype)initWithFrame:(CGRect)frame {if (self = [super initWithFrame:frame]) {[self initImageViewWithFrame:self.bounds];}return self;
}- (void)buildMaskView {// 如果没有,就返回空if (self.horizontalCount < 1 || self.verticalCount < 1) {return;}// 承载所有的maskViewself.allMaskView = [[UIView alloc] initWithFrame:self.bounds];self.maskView    = self.allMaskView;// 计算出每个view的尺寸CGFloat height         = self.frame.size.height;CGFloat width          = self.frame.size.width;CGFloat maskViewHeight = self.verticalCount   <= 1 ? height : (height / self.verticalCount);CGFloat maskViewWidth  = self.horizontalCount <= 1 ? width  : (width  / self.horizontalCount);// 用以计数int count = 0;// 先水平循环,再垂直循环for (int horizontal = 0; horizontal < self.horizontalCount; horizontal++) {for (int vertical = 0; vertical < self.verticalCount; vertical++) {CGRect frame = CGRectMake(maskViewWidth  * horizontal,maskViewHeight * vertical,maskViewWidth,maskViewHeight);UIView *maskView         = [[UIView alloc] initWithFrame:frame];maskView.frame           = frame;maskView.tag             = kSubViewTag + count;maskView.backgroundColor = [UIColor blackColor];[self.allMaskView addSubview:maskView];count++;}}self.maskViewCount = count;// 存储self.countArray  = [NSMutableArray array];for (int i = 0; i < self.maskViewCount; i++) {[self.countArray addObject:@(i)];}
}/***  策略模式一**  @param inputNumber 输入**  @return 输出*/
- (NSInteger)strategyNormal:(NSInteger)inputNumber {NSNumber *number = self.countArray[inputNumber];return number.integerValue;
}- (void)fadeAnimated:(BOOL)animated {if (animated == YES) {for (int i = 0; i < self.maskViewCount; i++) {UIView *tmpView = [self maskViewWithTag:[self strategyNormal:i]];[UIView animateWithDuration:(self.fadeDuradtion <= 0.f ? 1.f : self.fadeDuradtion)delay:i * (self.animationGapDuration <= 0.f ? 0.2f : self.animationGapDuration)options:UIViewAnimationOptionCurveLinearanimations:^{tmpView.alpha = 0.f;} completion:^(BOOL finished) {}];}} else {for (int i = 0; i < self.maskViewCount; i++) {UIView *tmpView = [self maskViewWithTag:i];tmpView.alpha   = 0.f;}}
}- (void)showAnimated:(BOOL)animated {if (animated == YES) {for (int i = 0; i < self.maskViewCount; i++) {UIView *tmpView = [self maskViewWithTag:[self strategyNormal:i]];[UIView animateWithDuration:(self.fadeDuradtion <= 0.f ? 1.f : self.fadeDuradtion)delay:i * (self.animationGapDuration <= 0.f ? 0.2f : self.animationGapDuration)options:UIViewAnimationOptionCurveLinearanimations:^{tmpView.alpha = 1.f;} completion:^(BOOL finished) {}];}} else {for (int i = 0; i < self.maskViewCount; i++) {UIView *tmpView = [self maskViewWithTag:i];tmpView.alpha   = 1.f;}}
}/***  根据tag值获取maskView**  @param tag maskView的tag值**  @return tag值对应的maskView*/
- (UIView *)maskViewWithTag:(NSInteger)tag {return [self.maskView viewWithTag:tag + kSubViewTag];
}#pragma mark - setter & getter.@synthesize contentMode = _contentMode;- (void)setContentMode:(UIViewContentMode)contentMode {_contentMode               = contentMode;self.imageView.contentMode = contentMode;
}- (UIViewContentMode)contentMode {return _contentMode;
}@synthesize image = _image;- (void)setImage:(UIImage *)image {_image               = image;self.imageView.image = image;
}- (UIImage *)image {return _image;
}@end

控制其中，用定时器设定5张图片的交替轮播，采用两层TranformFadeView

#import "ViewController.h"
#import "TranformFadeView.h"typedef enum : NSUInteger {kTypeOne,kTypeTwo,} EType;
@interface ViewController ()@property (weak, nonatomic) IBOutlet UIView *contentView;
@property (nonatomic, strong) TranformFadeView *tranformFadeViewOne;
@property (nonatomic, strong) TranformFadeView *tranformFadeViewTwo;
@property (nonatomic,strong)NSTimer *timer;
@property (nonatomic)         EType     type;@property (nonatomic, strong) NSArray   *images;
@property (nonatomic)         NSInteger  count;
@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];self.images = @[[UIImage imageNamed:@"banner5"],[UIImage imageNamed:@"banner1"],[UIImage imageNamed:@"banner2"],[UIImage imageNamed:@"banner3"],[UIImage imageNamed:@"banner4"]];// 图片1self.tranformFadeViewOne                      = [[TranformFadeView alloc] initWithFrame:self.contentView.bounds];self.tranformFadeViewOne.contentMode          = UIViewContentModeScaleAspectFill;self.tranformFadeViewOne.image                = [self currentImage];self.tranformFadeViewOne.verticalCount        = 3;self.tranformFadeViewOne.horizontalCount      = 20;self.tranformFadeViewOne.center               = self.contentView.center;self.tranformFadeViewOne.fadeDuradtion        = 1.f;self.tranformFadeViewOne.animationGapDuration = 0.075f;[self.tranformFadeViewOne buildMaskView];[self.contentView addSubview:self.tranformFadeViewOne];// 图片2self.tranformFadeViewTwo                      = [[TranformFadeView alloc] initWithFrame:self.contentView.bounds];self.tranformFadeViewTwo.contentMode          = UIViewContentModeScaleAspectFill;self.tranformFadeViewTwo.image                = [self currentImage];self.tranformFadeViewTwo.verticalCount        = 3;self.tranformFadeViewTwo.horizontalCount      = 30;self.tranformFadeViewTwo.center               = self.contentView.center;self.tranformFadeViewTwo.fadeDuradtion        = 1.f;self.tranformFadeViewTwo.animationGapDuration = 0.075f;[self.tranformFadeViewTwo buildMaskView];[self.contentView addSubview:self.tranformFadeViewTwo];[self.tranformFadeViewTwo fadeAnimated:NO];self.timer = [NSTimer timerWithTimeInterval:4 target:self selector:@selector(timerAction) userInfo:nil repeats:YES];[[NSRunLoop mainRunLoop] addTimer:self.timer forMode:NSDefaultRunLoopMode];
}- (void)timerAction
{NSLog(@"adsf");if (self.type == kTypeOne) {self.type = kTypeTwo;[self.contentView sendSubviewToBack:self.tranformFadeViewTwo];self.tranformFadeViewTwo.image = [self currentImage];[self.tranformFadeViewTwo showAnimated:NO];[self.tranformFadeViewOne fadeAnimated:YES];} else {self.type = kTypeOne;[self.contentView sendSubviewToBack:self.tranformFadeViewOne];self.tranformFadeViewOne.image = [self currentImage];[self.tranformFadeViewOne showAnimated:NO];[self.tranformFadeViewTwo fadeAnimated:YES];}}
- (UIImage *)currentImage {self.count = ++self.count % self.images.count;return self.images[self.count];
}

@end

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