IOS源碼之OC相簿，可以迴圈查看圖片

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#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//懶載入,調用get方法時對屬性進行初始化-(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];    //設定UIScrollView的contentSize    _huaBu.contentSize=CGSizeMake(kuan*3, gao);    //設定分頁    _huaBu.pagingEnabled=YES;    //隱藏水平滾動欄和垂直滾動欄    _huaBu.showsHorizontalScrollIndicator=NO;    _huaBu.showsVerticalScrollIndicator=NO;    //設定背景顏色,突出不同的圖片    _huaBu.backgroundColor=[UIColor blackColor];    //設定代理要遵守協議<UIScrollViewDelegate>    _huaBu.delegate=self;    //調用方法添加子視圖    [self tianJiaZiShiTu];    //調用方法添加圖片    [self tianJiaTuPian];}//添加子視圖的方法-(void)tianJiaZiShiTu{    //相簿的話，是一個大的UIScrollView中放了很多的小UIScrollView，但是為了節省記憶體空間，所以只是添加了三個UIScrollView（圖片不停的變換位置）    for (int i=0; i<3; i++) {        //建立YZUIScrollView        YZUIScrollView * yzuisv=[[YZUIScrollView alloc] initWithFrame:CGRectMake(kuan*i, 0, kuan-20, gao)];        //添加YZUIScrollView        [_huaBu addSubview:yzuisv];        //設定tag值，便於區分        yzuisv.tag=1000+i;    }}//添加方法的圖片-(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]];    //設定位移量，這步很重要    _huaBu.contentOffset=CGPointMake(kuan, 0);}//確保索引可用-(NSInteger)indexFofEnable:(NSInteger)index{    if(index<0)    {        return self.images.count-1;    }    else if (index>self.images.count-1)    {        return 0;    }    else        return index;}//滾動結束後，把所有的縮放視圖比例還原為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;        }    }    //判斷左右滑動    //位移量的x為0，就是說明向右滑動了，就是看的之前左邊的那張圖片    if(scrollView.contentOffset.x==0)    {        //對應的映像應該是變成左邊的映像        _currentIndex--;    }    //位移量的x為兩個螢幕的寬，就是說明向左滑動了，就是看的之前右邊的那張圖片    else if(scrollView.contentOffset.x== kuan*2)    {        //對應的映像應該是變成右邊的映像        _currentIndex++;    }    _currentIndex=[self indexFofEnable:_currentIndex];    [self tianJiaTuPian];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

　　第二個類

 

#import "YZUIScrollView.h"@interface YZUIScrollView ()<UIScrollViewDelegate>

@property(nonatomic,strong)UIImage *image;//內容視圖的圖片

@property(nonatomic,strong)UIImageView *imageview;@end@implementation YZUIScrollView-(instancetype)initWithFrame:(CGRect)frame{    if(self =[super initWithFrame:frame])    {        //新增內容視圖        UIImageView *imageview1=[[UIImageView alloc] initWithFrame:self.bounds];        [self addSubview:imageview1];        _imageview=imageview1;        //設定最大最小倍數和代理        self.minimumZoomScale=0.5;        self.maximumZoomScale=1.5;        self.delegate=self;        //雙擊事件        UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(shuangJi:)];        tap.numberOfTapsRequired=2;        [self addGestureRecognizer:tap];    }    return self;}-(void)shuangJi:(UITapGestureRecognizer *)tap{    //當縮放比例不為1.0，還原縮放比例    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];}//重寫setImg方法-(void)setImage:(UIImage *)image{    //set本身的方法要完成的事必須完成    _image=image;    //設定內容視圖的圖片    _imageview.image=image;}//UIScrollViewDelegate代理方法-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{    return _imageview;}@end

　　

 

IOS源碼之OC相簿，可以迴圈查看圖片