iOS中的UIScorllView(滑动控件,时机控制)的基本使用

#import "RootViewController.h"
#define kScreenWidth [UIScreen mainScreen].bounds.size.width
#define kScreenHeight [UIScreen mainScreen].bounds.size.height
@interface RootViewController () <UIScrollViewDelegate>

@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    /**
      UIScorllView 滑动控件的基类,可以支持滚动,用于当内容页区域大于可视区域大小时,可以通过滚动来查看整个内容区域,他的UITableView,UITextView的父类
   
     
     */
    //1.创建控件
    UIScrollView *scrolView = [[UIScrollView alloc] initWithFrame:CGRectMake(20, 30, kScreenWidth - 20 *2, kScreenHeight - 30 * 2)];

    //2.配置属性
    scrolView.backgroundColor = [UIColor redColor];
    //1设置内容页的大小
    scrolView.contentSize = CGSizeMake(scrolView.bounds.size.width, scrolView.bounds.size.height);
    //2设置偏移量
    scrolView.contentOffset = CGPointMake(400, 0);
    //3隐藏欢动指示器
//    scrolView.showsHorizontalScrollIndicator = NO; //水平
//    scrolView.showsVerticalScrollIndicator = NO; // 竖直
    //4控制scrollView能否滑动
    scrolView.scrollEnabled = YES;
    //5方向锁,控制滑动时只能单方向滑动
    scrolView.directionalLockEnabled = NO;
    //6控制点击状态条时,scroll是否可以回到顶部,y的偏移量为0;
    scrolView.scrollsToTop = YES;
    //7控制当前内容页到边界是,是否具有弹跳效果.
    scrolView.bounces = YES;
    //8控制即使内容页区域大小 小于等于 scrollView大小时,依然有反弹效果
    scrolView.alwaysBounceHorizontal = YES;
    
   //9代理
    /**
     *  对于协议和代理的使用步骤:(一对多  --- 一个代理对象可以做多个任务(方法))
     1.针对自定义协议:
        1>自定义协议(存放让代理实现的任务,分为可选和必须实现)
        2>定义代理属性(用于存储代理对象,id类型 --要服从协议,语义特性为assign)
        3>在其他文件中为该类设置代理(指定任务由谁完成)
        4>让代理对象所属的类服从协议(答应干活)
        5>代理对象实现协议中的方法(制定任务完成的细节)
        6>委托方通知代理去执行协议中的方法,(让代理干活)
     2.无需自定义协议:
        1>在其他类中为该类指定代理(指定任务由谁来做)
        2>让代理对象所属的类服从协议(代理答应任务由他来做)
        3>代理对象实现协议中的方法(制定任务完成的细节)
     */
    scrolView.delegate = self;
    
    //10和缩放视图有关的的属性
    scrolView.minimumZoomScale = 1.0;
    scrolView.maximumZoomScale = 4.0;
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    //3.添加到父视图
    [self.view addSubview:scrolView];
    
    //4.释放
    [scrolView release];
    //添加到UIImageView
    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"3.jpg"]];
    imageView.tag = 200;
    imageView.userInteractionEnabled = YES;
    imageView.frame = CGRectMake(0 , 0, scrolView.contentSize.width, scrolView.contentSize.height);
    [scrolView addSubview:imageView];
    [imageView release];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation


*/
//只要拖拽就会触发,拖拽改变偏移量
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
   //打印偏移量
   // NSLog(@"offst = %@",NSStringFromCGPoint(scrollView.contentOffset));

    
}
// any offset changes    Zoom缩放
//只要缩放就会触发,改变大小
- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
   //打印内容页的大小
    NSLog(@"contentSize = %@",NSStringFromCGSize(scrollView.contentSize));
}

//当scrollView将要拖拽时,此时手指刚刚接触到屏幕
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
   //滑动结束  回到最左边
    [scrollView setContentOffset:CGPointZero animated:YES];
}

//当scrollView 开始加速时触发,此时手指已经离开视图(不一定触发,有加速过程才会触发该方法)
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{
    
}
// called on finger up if the user dragged. decelerate is true if it will continue moving afterwards
//当scrollView减速结束是触发,已经停止滑动
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    
}
//当scrollView将要结束拖拽是接触
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
    
}// called on finger up as we are moving
//当scrollView计数拖拽时触发,此时手指已经离开视图
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    
}// called when scroll view grinds to a halt

//当滑动scrollView ,并且动画结束时触发(前提是必须要有动画效果)
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{
    
}// called when setContentOffset/scrollRectVisible:animated: finishes. not called if not animating
//返回需要缩放的视图,但是只能是scrollView的子视图
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
     NSLog(@"%s,%d",__FUNCTION__ , __LINE__);
    return [scrollView viewWithTag:200];
}
//当将要开始缩放时触发
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view{
    
}
//缩放结束时触发
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale
{
    
}
//当scrollsToTop属性设置为YES时,通过该方法进一步询问,点击状态条是否可以回到顶部
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView{
     NSLog(@"%s,%d",__FUNCTION__ , __LINE__);
    return YES;
}// return a yes if you want to scroll to the top. if not defined, assumes YES
//当点击状态条,scrollView回到顶部时触发
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView{
     NSLog(@"%s,%d",__FUNCTION__ , __LINE__);
}// called when scrolling animation finished. may be called immediately if already at top

@end