#import "ViewController.h" #import "YZUIScrollView.h" #define kuan ([UIScreen mainScreen].bounds.size.width+20) #define gao [UIScreen mainScreen].bounds.size.height @interface ViewController ()<UIScrollViewDelegate> @property (weak, nonatomic) IBOutlet UIScrollView *huaBu; @property(nonatomic,strong)NSArray *images; @property(nonatomic)NSInteger currentIndex; @end @implementation ViewController //懒加载,调用get方法时对属性进行初始化 -(NSArray *)images { if(_images==nil) { NSMutableArray *imagearray=[NSMutableArray array]; for (int i=1; i<7; i++) { NSString *imageName=[NSString stringWithFormat:@"new_feature_%d",i]; UIImage *image=[UIImage imageNamed:imageName]; [imagearray addObject:image]; } _images=imagearray; } return _images; } - (void)viewDidLoad { [super viewDidLoad]; //设置UIScrollView的contentSize _huaBu.contentSize=CGSizeMake(kuan*3, gao); //设置分页 _huaBu.pagingEnabled=YES; //隐藏水平滚动栏和垂直滚动栏 _huaBu.showsHorizontalScrollIndicator=NO; _huaBu.showsVerticalScrollIndicator=NO; //设置背景颜色,突出不同的图片 _huaBu.backgroundColor=[UIColor blackColor]; //设置代理要遵守协议<UIScrollViewDelegate> _huaBu.delegate=self; //调用方法添加子视图 [self tianJiaZiShiTu]; //调用方法添加图片 [self tianJiaTuPian]; } //添加子视图的方法 -(void)tianJiaZiShiTu { //相册的话,是一个大的UIScrollView中放了很多的小UIScrollView,但是为了节省内存空间,所以只是添加了三个UIScrollView(图片不停的变换位置) for (int i=0; i<3; i++) { //创建YZUIScrollView YZUIScrollView * yzuisv=[[YZUIScrollView alloc] initWithFrame:CGRectMake(kuan*i, 0, kuan-20, gao)]; //添加YZUIScrollView [_huaBu addSubview:yzuisv]; //设置tag值,便于区分 yzuisv.tag=1000+i; } } //添加方法的图片 -(void)tianJiaTuPian { YZUIScrollView *leftSC=(YZUIScrollView *)[_huaBu viewWithTag:1000]; YZUIScrollView *middleSC=(YZUIScrollView *)[_huaBu viewWithTag:1001]; YZUIScrollView *rightSC=(YZUIScrollView *)[_huaBu viewWithTag:1002]; leftSC.image=self.images[[self indexFofEnable:_currentIndex-1]]; middleSC.image=self.images[[self indexFofEnable:_currentIndex]]; rightSC.image=self.images[[self indexFofEnable:_currentIndex+1]]; //设置偏移量,这步很重要 _huaBu.contentOffset=CGPointMake(kuan, 0); } //确保索引可用 -(NSInteger)indexFofEnable:(NSInteger)index { if(index<0) { return self.images.count-1; } else if (index>self.images.count-1) { return 0; } else return index; } //滚动结束后,把所有的缩放视图比例还原为1.0 -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { for (id obj in _huaBu.subviews) { if([obj isKindOfClass:[UIScrollView class]]) { UIScrollView *scaleSC=(UIScrollView *)obj; scaleSC.zoomScale=1.0; } } //判断左右滑动 //偏移量的x为0,就是说明向右滑动了,就是看的之前左边的那张图片 if(scrollView.contentOffset.x==0) { //对应的图像应该是变成左边的图像 _currentIndex--; } //偏移量的x为两个屏幕的宽,就是说明向左滑动了,就是看的之前右边的那张图片 else if(scrollView.contentOffset.x== kuan*2) { //对应的图像应该是变成右边的图像 _currentIndex++; } _currentIndex=[self indexFofEnable:_currentIndex]; [self tianJiaTuPian]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end
第二个类
#import "YZUIScrollView.h" @interface YZUIScrollView ()<UIScrollViewDelegate>
@property(nonatomic,strong)UIImage *image;//内容视图的图片
@property(nonatomic,strong)UIImageView *imageview; @end @implementation YZUIScrollView -(instancetype)initWithFrame:(CGRect)frame { if(self =[super initWithFrame:frame]) { //添加内容视图 UIImageView *imageview1=[[UIImageView alloc] initWithFrame:self.bounds]; [self addSubview:imageview1]; _imageview=imageview1; //设置最大最小倍数和代理 self.minimumZoomScale=0.5; self.maximumZoomScale=1.5; self.delegate=self; //双击事件 UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(shuangJi:)]; tap.numberOfTapsRequired=2; [self addGestureRecognizer:tap]; } return self; } -(void)shuangJi:(UITapGestureRecognizer *)tap { //当缩放比例不为1.0,还原缩放比例 if (self.zoomScale !=1.0) { [self setZoomScale:1.0 animated:YES]; return ; } CGPoint location =[tap locationInView:self]; CGRect rect =CGRectMake(location.x-100, location.y-100,200,200); [self zoomToRect:rect animated:YES]; } //重写setImg方法 -(void)setImage:(UIImage *)image { //set本身的方法要完成的事必须完成 _image=image; //设置内容视图的图片 _imageview.image=image; } //UIScrollViewDelegate代理方法 -(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView { return _imageview; } @end