一个UIScrollView添加多个imageview不显示，代码如下：

UIScrollView *appScrollView=[[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 275)];

    appScrollView.contentSize=CGSizeMake(URLArray.count *appScrollView.frame.size.width /3, appScrollView.frame.size.height);


    for(int i=0;i<[URLArray count];i++)
    {
        NSString *URLString=URLArray;

        NSURL *url=[NSURL URLWithString:URLString];

        NSData *imageData=[NSData dataWithContentsOfURL:url];
        UIImage *image=[UIImage imageWithData:imageData];
        UIImageView *imageView=[[UIImageView alloc] initWithImage:image];
//NSLog(@"%f",appScrollView.frame.size.width/3);

        CGFloat imageViewX=i*appScrollView.frame.size.width/3;

        CGFloat imageViewY=0;
        CGFloat imageViewW=appScrollView.frame.size.width/3;
        CGFloat imageViewH=appScrollView.frame.size.height;

        imageView.frame=CGRectMake(imageViewX,imageViewY, imageViewW, imageViewH);
        [appScrollView addSubview:imageView];
       // NSLog(@"111");

    }
    appScrollView.pagingEnabled=YES;
    appScrollView.delegate=self;
    [self.view addSubview:appScrollView];

一个UIScrollView添加多个imageview不显示，代码如下：

UIScrollView *appScrollView=[[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 275)];

    appScrollView.contentSize=CGSizeMake(URLArray.count *appScrollView.frame.size.width /3, appScrollView.frame.size.height);


    for(int i=0;i<[URLArray count];i++)
    {
        NSString *URLString=URLArray;

        NSURL *url=[NSURL URLWithString:URLString];

        NSData *imageData=[NSData dataWithContentsOfURL:url];
        UIImage *image=[UIImage imageWithData:imageData];
        UIImageView *imageView=[[UIImageView alloc] initWithImage:image];
//NSLog(@"%f",appScrollView.frame.size.width/3);

        CGFloat imageViewX=i*appScrollView.frame.size.width/3;

        CGFloat imageViewY=0;
        CGFloat imageViewW=appScrollView.frame.size.width/3;
        CGFloat imageViewH=appScrollView.frame.size.height;

        imageView.frame=CGRectMake(imageViewX,imageViewY, imageViewW, imageViewH);
        [appScrollView addSubview:imageView];
       // NSLog(@"111");

    }
    appScrollView.pagingEnabled=YES;
    appScrollView.delegate=self;
    [self.view addSubview:appScrollView];