IOS开发（18）之UIScrollView控件

1 前言

2 代码实例

#import <UIKit/UIKit.h>

@interface ZYViewController : UIViewController<UIScrollViewDelegate>

@property(nonatomic,strong) UIImageView *myImageView;
@property(nonatomic,strong) UIScrollView *myScrollView;

@end

@synthesize myImageView;
@synthesize myScrollView;

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor whiteColor];
UIImage *imageToLoad = [UIImage imageNamed:@"Apple.png"];
self.myImageView = [[UIImageView alloc] initWithImage:imageToLoad];
self.myScrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];//初始化UIScrollerView控件
[self.myScrollView addSubview:self.myImageView];//添加图片到UIScrollerView中
self.myScrollView.contentSize = self.myImageView.bounds.size;//将图片的大小设置给UIScrollerView
self.myScrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite;//滑动视图外观设置为白色
myScrollView.delegate = self;//滚动视图的代理设置为自己
[self.view addSubview:self.myScrollView];//添加UIScrollerView

}

#pragma mark UIScrollView
//内容滑动时调用该方法
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
self.myScrollView.alpha = 0.5f;
NSLog(@"调用scrollViewDidScroll方法");
}
//滑动视图手指离开屏幕而且内容还在滑动的时候
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
self.myScrollView.alpha = 1.0f;
NSLog(@"调用scrollViewDidEndDecelerating方法");
}
//完成拖拽动作时候调用的
-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
self.myScrollView.alpha = 1.0f;
NSLog(@"调用scrollViewDidEndDragging方法");
}

#import <UIKit/UIKit.h>

@interface ZYUIScrollViewController : UIViewController

@property(nonatomic,strong) UIScrollView *myScrollView;

@end

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor whiteColor];
//实例化三张图片
UIImage *iPhone = [UIImage imageNamed:@"iPhone.png"];
UIImage *iPod = [UIImage imageNamed:@"iPod.png"];
UIImage *macBookAir = [UIImage imageNamed:@"Mac.png"];
CGRect scrollViewRect = self.view.bounds;//初始化一个屏幕视图大小矩形边框
self.myScrollView = [[UIScrollView alloc] initWithFrame:scrollViewRect];//初始化UIScrollView控件
self.myScrollView.pagingEnabled = YES;//启动分页
self.myScrollView.contentSize = CGSizeMake(scrollViewRect.size.width*3.0f, scrollViewRect.size.height);//设置UIScrollView的大小
[self.view addSubview:self.myScrollView];//添加UIScrollView视图
CGRect imageViewRect = self.view.bounds;
UIImageView *iPhoneImageView = [[UIImageView alloc] initWithImage:iPhone];//初始化图片视图
[iPhoneImageView setFrame:imageViewRect];//设置UIImage的大小
[self.myScrollView addSubview:iPhoneImageView];
imageViewRect.origin.x += imageViewRect.size.width;//imageViewRect的横坐标向右移动原来imageViewRect宽度的距离
UIImageView *iPodImageView = [[UIImageView alloc] initWithImage:iPod];
[iPodImageView setFrame:imageViewRect];
[self.myScrollView addSubview:iPodImageView];
imageViewRect.origin.x += imageViewRect.size.width;
UIImageView *macBookAirImageView = [[UIImageView alloc] initWithImage:macBookAir];
[macBookAirImageView setFrame:imageViewRect];
[self.myScrollView addSubview:macBookAirImageView];

}

3 结语