#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
