IOS UIScrollView学习

@interface IKEDViewController ()<UIScrollViewDelegate>

{
UIImageView *myImageView;
UIScrollView *myScrollView;

}

UIImage *iPhone = [UIImage imageNamed:@"iPhone.png"];
UIImage *iPad = [UIImage imageNamed:@"iPad.png"];
UIImage *macBookAir = [UIImage imageNamed:@"MacBookAir.png"];

CGRect scrollViewRect = self.view.bounds;

myScrollView = [[UIScrollView alloc] initWithFrame:scrollViewRect];
myScrollView.pagingEnabled = YES;

myScrollView.contentSize = CGSizeMake(scrollViewRect.size.width * 3, scrollViewRect.size.height);

[self.view addSubview:myScrollView];

UIImageView *iphoneImgView = [[UIImageView alloc]initWithFrame:imgRect];
iphoneImgView.image = iPhone;
iphoneImgView.contentMode = UIViewContentModeScaleAspectFit;
[myScrollView addSubview:iphoneImgView];

imgRect.origin.x+=imgRect.size.width;
UIImageView *ipad = [[UIImageView alloc]initWithFrame:imgRect];
ipad.contentMode = UIViewContentModeScaleAspectFit;
ipad.image = iPad;
[myScrollView addSubview:ipad];

imgRect.origin.x+=imgRect.size.width;
UIImageView *macBook = [[UIImageView alloc]initWithFrame:imgRect];
macBook.contentMode = UIViewContentModeScaleAspectFit;
macBook.image = macBookAir;
[myScrollView addSubview:macBook];