IOS，Objective-C，相冊功能的實現。，iosobjective-c

IOS，Objective-C，相冊功能的實現。，iosobjective-c

#import "ViewController.h"

#define kuan [UIScreen mainScreen].bounds.size.width
#define gao [UIScreen mainScreen].bounds.size.height
@interface ViewController ()<UIScrollViewDelegate>
@property (weak, nonatomic) IBOutlet UIScrollView *huaKuang;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //設置contentSize
    _huaKuang.contentSize=CGSizeMake((kuan)*4, gao);
    _huaKuang.backgroundColor=[UIColor blackColor];
    //設置分頁
    _huaKuang.pagingEnabled=YES;
    //隱藏滾動條
    //滾動時是否顯示水平滾動條
    _huaKuang.showsHorizontalScrollIndicator=NO;
    //滾動時是否顯示垂直滾動條
    _huaKuang.showsVerticalScrollIndicator=NO;
    //設置代理,需要遵循代理協議<UIScrollViewDelegate>，寫在@interface ViewController ()的後面
    _huaKuang.delegate=self;
    //添加子視圖，因為是多個所以寫了一個方法來實現添加
    [self tianJianZiShiTu];
}
-(void)tianJianZiShiTu
{
    //假如有六個圖片，就要創建六個UIScrollView和六個UIImageView,並且找到六個圖片
    for(int i=0;i<3;i++)
    {
        //創建UIScrollView
        //為了區分開不同的照片加一個20黑邊，需要設置ScrollViewscroll View中的Left和View中的Width
        UIScrollView *uisv=[[UIScrollView alloc] initWithFrame:CGRectMake((kuan+20)*i, 0, kuan, gao)];
        //把創建完成的添加到總的那個UIScrollView上
        [_huaKuang addSubview:uisv];
        //創建UIImageView
        UIImageView *uiiv=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, kuan, gao)];
        //把創建的UIImageView添加到UIScrollView中
        [uisv addSubview:uiiv];
        //設置UIImageView的圖片
         NSString *imageName = [NSString stringWithFormat:@"new_feature_%d",i + 1];
        uiiv.image=[UIImage imageNamed:imageName];
        //設置tag值
        uiiv.tag=1000;
        //設置UIScrollView的代理
        uisv.delegate=self;
        //設置縮放范圍
        uisv.minimumZoomScale=0.5;
        uisv.maximumZoomScale=1.5;
        //定義點擊事件
        UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dianJiShiJian:)];
        //設置有效點擊數(就是雙擊)
        tap.numberOfTapsRequired=2;
        //添加到UIScrollView中
        [uisv addGestureRecognizer:tap];
    }
}
-(void)dianJiShiJian:(UITapGestureRecognizer *)tap
{
    //獲取點擊事件的view
    UIScrollView *uisv1=(UIScrollView *)tap.view;
    if(uisv1.zoomScale!=1.0)
   {
       [uisv1 setZoomScale:1.0 animated:YES];
       return ;
   }
    CGPoint location=[tap locationInView:tap.view];
    CGRect rect=CGRectMake(location.x-100, location.y-100, 200, 200);
    [uisv1 zoomToRect:rect animated:YES];
}
//指定縮放的視圖
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
    if (scrollView == _huaKuang) {
        return nil;
    }
    UIImageView *imageView = (UIImageView *)[scrollView viewWithTag:1000];
    return imageView;
}

//滾動結束，把所有的縮放視圖的縮放比例置為1.0
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    if (scrollView == _huaKuang) {
        for (id obj in _huaKuang.subviews) {
            if ([obj isKindOfClass:[UIScrollView class]]) {
                UIScrollView *scaleSC = (UIScrollView *)obj;
                scaleSC.zoomScale = 1.0;
            }
        }
    }
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

@end