UIScrollView

#import "RootViewController.h"
//定义保存屏幕宽度和高度的宏

#define kWidth self.view.frame.size.width
#define kHeidth self.view.frame.size.height
@interface RootViewController ()

@end

@implementation RootViewController

#pragma mark ------- 代理检测滚动过程中触发的方法----

//滚动过程中触发的方法
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    NSLog(@"正在滚动");
    

}
//即将开始拖拽,此时滚动视图即将加速
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    NSLog(@"即将开始拖拽");
}
//结束拖拽,不再加速
-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
    NSLog(@"拖拽结束");
}
//即将开始减速
-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView {
    NSLog(@"即将开始减速");
}

//结束减速，也就是停止滚动
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    NSLog(@"结束滚动");
    // 先从负责滚动的⼤scrollView找到他的⼦视图
    for (UIScrollView *sView in scrollView.subviews){
        // 在根据⼦类的对象类型进⾏判断
        if ([sView isKindOfClass:[UIScrollView class]]){
            // 把视图的尺⼨恢复到原有尺⼨
            sView.zoomScale = 1.0;
        }
    }

}


//指定缩放视图
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
    return [scrollView.subviews firstObject];
}
//中心缩放
-(void)scrollViewDidZoom:(UIScrollView *)scrollView {
    UIImageView *imageView = [scrollView.subviews firstObject];
    
    if (scrollView.zoomScale <= 1.0) {
        imageView.center = self.view.center ;
    }
}


-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale {
    NSLog(@"%@",NSStringFromCGSize(scrollView.contentSize));//只是打印
   
}



- (void)viewDidLoad {
    
    
    
    [super viewDidLoad];
    
    
    
    //创建滚动视图
    int a = 7;
    CGFloat totalWidth = self.view.frame.size.width;
    CGFloat totalHeight = self.view.frame.size.height;
    UIScrollView *scroll = [[[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] bounds]]autorelease];
    scroll.backgroundColor = [UIColor grayColor];
    //设置代理
    scroll.delegate = self;
    /**
     如果想实现滚动视图的缩放功能，必须指定缩放的视图以及缩放的比例
     指定缩放视图需要实现代理方法，指定缩放比例，shhiwei滚动设置缩放比例
     
     
     */
    
    
//    scroll.minimumZoomScale = 0.5;//最小缩放比例
//    scroll.maximumZoomScale = 2.0;//最大缩放比例
    [self.view addSubview:scroll];
    //设置滚动视图的相关属性
    //1、滚动区域，内容区域的大小
    
    //如果想要实现滚动操作，有三种情况
    /*
     1、内容视图的宽（滚动区域的宽大于滚动视图的宽）
     2、内容视图（滚动区域）的高大于滚动视图的高
     3、内容视图（滚动区域）的宽和高大于滚动视图的宽和高
     
     */
 
    
    
    scroll.contentSize = CGSizeMake(totalWidth * a,0);
    scroll.contentOffset =CGPointMake(0, 0);   //偏移量
    
    //设置整页滚动
    
    scroll.pagingEnabled = YES;
    
    //关闭横向显示条
//    scroll.showsHorizontalScrollIndicator = NO;
    
    //关闭滚动视图的回弹效果
    scroll.bounces = NO;
    
    
    //for循环创建七个UIImageView并且添加到滚动视图上去
    for (int i = 0; i < a; i++) {
        
        
        
        UIImageView *imageView =
        [[UIImageView alloc]
         initWithFrame:CGRectMake(0, 0,
                                  totalWidth, totalHeight)];
        imageView.image = [UIImage
                           imageNamed:[NSString stringWithFormat:@"%d.jpg", i + 1]];
        

        //先创建小
        UIScrollView *scroll1 = [[UIScrollView alloc] initWithFrame:CGRectMake(totalWidth * i,0 , totalWidth, totalHeight)];
        
        scroll1.delegate = self;
        scroll1.minimumZoomScale = 0.5;
        scroll1.maximumZoomScale = 2.0;
        
                [scroll1 addSubview:imageView];
        
        [scroll addSubview:scroll1];
        
        [imageView release];
        [scroll1 release];
    }

    // Do any additional setup after loading the view.
}