UICollectionView实现书本翻页布局

效果图:

UICollectionView能够实现你想要的任何布局,Vincent Ngo在raywenderlich中,用swift介绍了如何实现书本翻页布局,不得不佩服Vincent Ngo的想法,链接地址:http://www.raywenderlich.com/94565/how-to-create-an-ios-book-open-animation-part-1;

本文参考了这种思想,用OC编程实现了其中一部分效果,如上图所示;下面代码在每处都加上了详细解释,欢迎大家提供意见,

新建一个BookCell,继承自UIcollectionViewCell,在实现部分,重写applyLayoutAttributes方法,实现书本边缘圆角效果:

#import "BookCell.h"@implementation BookCell{BOOL isRightPage;
}//初始化
- (instancetype)initWithFrame:(CGRect)frame {self = [super initWithFrame:frame];if (self) {//设置背景self.bgView = [[UIView alloc] initWithFrame:self.contentView.bounds];self.bgView.backgroundColor = [UIColor whiteColor];[self.contentView addSubview:self.bgView];//添加图片self.imageView = [[UIImageView alloc] initWithFrame:self.bgView.bounds];[self.bgView addSubview:self.imageView];//添加星座labelself.textLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 80, 40)];self.textLabel.center = CGPointMake(self.bgView.bounds.size.width / 2 + 20, self.bgView.bounds.size.height - 20);[self.bgView addSubview:self.textLabel];//开启反锯齿self.layer.allowsEdgeAntialiasing = YES;}return self;
}//默认自定义布局,布局圆角 和 中心线
- (void)applyLayoutAttributes:(UICollectionViewLayoutAttributes *)layoutAttributes {[super applyLayoutAttributes:layoutAttributes];//判断cell的奇数偶数if (layoutAttributes.indexPath.item % 2 == 0) {//如果偶数,则中心线在左边,页面右边有圆角,左边没有圆角isRightPage = YES;self.layer.anchorPoint = CGPointMake(0, 0.5);} else {isRightPage = NO;self.layer.anchorPoint = CGPointMake(1, 0.5);}//圆角设置UIRectCorner corner = isRightPage ? UIRectCornerTopRight | UIRectCornerBottomRight : UIRectCornerTopLeft | UIRectCornerBottomLeft;UIBezierPath *bezier = [UIBezierPath bezierPathWithRoundedRect:self.bgView.bounds byRoundingCorners:corner cornerRadii:CGSizeMake(16, 16)];//CAShapeLayer: 通过给定的贝塞尔曲线UIBezierPath,在空间中作图CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];maskLayer.frame = self.bgView.bounds;maskLayer.path = bezier.CGPath;self.bgView.layer.mask = maskLayer;self.bgView.clipsToBounds = YES;
}
@end

新建一个 BookLayout 布局类,继承自 UICollectionViewLayout ,在这里我们将实现关键的3个必须实现的布局方法:

1. prepareLayout

2. collectionViewContentSize

3. layoutAttributesForElementsInRect

关键思想,是在 layoutAttributesForItemAtIndexPath 方法中,实现空间布局,考虑到frame的变化,旋转角度和旋转比例的变化,以及cell的frame变化后,anchor点的重新设定等;

#import "BookLayout.h"@implementation BookLayout//定义cell的尺寸
static CGFloat pageWidth = 180;
static CGFloat pageHeight = 280;
static CGFloat numberOfPages = 0; //定义总的cell个数- (void)prepareLayout {[super prepareLayout];//滚动结束时,翻动快些self.collectionView.decelerationRate = UIScrollViewDecelerationRateFast;numberOfPages = [self.collectionView numberOfItemsInSection:0];self.collectionView.pagingEnabled = YES;//滚动视图整页翻动
}//布局实时更新
- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds {return YES;
}//内容滚动区域设置
- (CGSize)collectionViewContentSize {//每个视图上显示两页CGFloat width = numberOfPages / 2 - 1;return CGSizeMake(width * self.collectionView.bounds.size.width, self.collectionView.bounds.size.height);
}//每个cell的布局设置
- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath {//获取cell的布局UICollectionViewLayoutAttributes *layoutAttributes = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];//设置frameCGRect frame;frame.origin.x = self.collectionView.bounds.size.width / 2 - pageWidth / 2 + self.collectionView.contentOffset.x;frame.origin.y = (self.collectionViewContentSize.height - pageHeight) / 2;frame.size.width = pageWidth;frame.size.height = pageHeight;layoutAttributes.frame = frame;//设置ratioCGFloat page = (indexPath.item - indexPath.item % 2) * 0.5; //结果 0,0,1,1,2,2 ...CGFloat ratio = - 0.5 + page - (self.collectionView.contentOffset.x / self.collectionView.bounds.size.width); //通过偏移量,获取比重//限制比重if (ratio > 0.5) {ratio = 0.5 + 0.1 * (ratio - 0.5);} else if (ratio < -0.5) {ratio = - 0.5 + 0.1 * (ratio + 0.5);}//if ((ratio > 0 && indexPath.item % 2 == 1) || (ratio < 0 && indexPath.item % 2 == 0)) {if (indexPath.row != 1) {return nil;}}//计算旋转角度angle,设定3D旋转CGFloat newRatio = MIN(MAX(ratio, -1), 1);//计算m34CATransform3D transform = CATransform3DIdentity;transform.m34 = 1.0 / - 2000;CGFloat angle = 0.0f;if (indexPath.item % 2 == 0) {//中心线在左边angle = (1 - newRatio) * (-M_PI_2);} else if (indexPath.item % 2 == 1) {//中心线在右边angle = (1 + newRatio) * (M_PI_2);}angle += (indexPath.row % 2) / 1000;transform = CATransform3DRotate(transform, angle, 0, 1, 0);layoutAttributes.transform3D = transform;if (indexPath.row == 0) {layoutAttributes.zIndex = NSIntegerMax;}return layoutAttributes;
}//所有cell布局数组
- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect {NSMutableArray *array = [NSMutableArray array];for (NSUInteger i = 0; i < numberOfPages; i++) {NSIndexPath *index = [NSIndexPath indexPathForItem:i inSection:0];UICollectionViewLayoutAttributes *attributes = [self layoutAttributesForItemAtIndexPath:index];if (attributes != nil) {[array addObject:attributes];}}return array;
}
@end

当布局完成后,我们就大功告成了,在 UICollectionView 中,实现代理和数据源就OK了

#import "BookView.h"
#import "BookCell.h"
#import "BookLayout.h"
@implementation BookView
{NSMutableArray *_array;NSMutableArray *_arrayStr;
}static NSString *const reuseIdentifier = @"cell";
- (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout {self = [super initWithFrame:frame collectionViewLayout:layout];if (self) {self.backgroundColor = [UIColor clearColor];self.dataSource = self;self.delegate =self;[self registerClass:[BookCell class] forCellWithReuseIdentifier:reuseIdentifier];self.showsHorizontalScrollIndicator = NO;_array = (NSMutableArray *)@[@"",@"封面.jpg",@"白羊座1.jpg",@"金牛座2.jpg",@"双子座3.jpg",@"巨蟹座4.jpg",@"狮子座5.jpg",@"处女座6.jpg",@"天平座7.jpg",@"天蝎座8.jpg",@"射手座9.jpg",@"魔蝎座10.jpg",@"水瓶座11.jpg",@"双鱼座12.jpg",@"封底.jpg",@""];_arrayStr = (NSMutableArray *)@[@"",@"",@"白羊座",@"金牛座",@"双子座",@"巨蟹座",@"狮子座",@"处女座",@"天平座",@"天蝎座",@"射手座",@"魔蝎座",@"水瓶座",@"双鱼座",@"",@""];}return self;
}- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {return 16;
}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {BookCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];cell.imageView.image = [UIImage imageNamed:_array[indexPath.row]];cell.textLabel.text = [NSString stringWithFormat:@"%@", _arrayStr[indexPath.row]];cell.textLabel.font = [UIFont systemFontOfSize:12];cell.textLabel.textColor = [UIColor colorWithRed:148 / 255.0f green:0.0f blue:211 / 255.0f alpha:1.0f];return cell;
}
@end

#import "ViewController.h"
#import "BookView.h"
#import "BookLayout.h"
#define kScreenWidth [UIScreen mainScreen].bounds.size.width
#define kScreenHeight [UIScreen mainScreen].bounds.size.height@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];BookLayout *layout = [[BookLayout alloc] init];BookView *book = [[BookView alloc] initWithFrame:CGRectMake(10, 100, 300, 500) collectionViewLayout:layout];[self.view addSubview:book];
}@end

是不是感觉不可思议!

代码下载地址:

http://download.csdn.net/download/et295394330/9122319

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