UIScrollView常用属性和代理方法

UIScrollView常用属性.

 1     //在设置最大滚动距离时 一般用到最后一个控件的最大Y值 或 X值 CGRectGetMaxX
 2     //点进去浏览,分别有最大最小x,最大最小y,最大最小中点(CGRectMidX ....MidY)
 3     CGFloat maxY = CGRectGetMaxY(self.lastBtn.frame) + 10;
 4     //设置滚动区域,x=0时只能上下滚动,y=0时左右滚动
 5     self.scrollView.contentSize = CGSizeMake(0, maxY);
 6     self.scrollView.delegate = self;
 7     //设置额外的滚动区域{top, left, bottom, right}
 8     self.scrollView.contentInset = UIEdgeInsetsMake(64, 0, 44, 0);
 9     //设置默认滚动位置(启动时停留在哪个位置)
10     self.scrollView.contentOffset = CGPointMake(0, -64);

代理方法的使用解释

 1 //只要滚动了就会触发
 2 - (void)scrollViewDidScroll:(UIScrollView *)scrollView;   
 3 {
 4 //     NSLog(@" scrollViewDidScroll");
 5         NSLog(@"ContentOffset  x is  %f,yis %f",scrollView.contentOffset.x,scrollView.contentOffset.y);
 6 }
 7 //开始拖拽视图
 8 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;   
 9 {
10    NSLog(@"scrollViewWillBeginDragging");
11 }
12 //完成拖拽
13 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate; 
14 {
15    NSLog(@"scrollViewDidEndDragging");
16 }
17 //将开始降速时
18 - (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView;   
19 {
20    NSLog(@"scrollViewWillBeginDecelerating");
21 }
22
23 //减速停止了时执行，手触摸时执行
24 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;   
25 {
26    NSLog(@"scrollViewDidEndDecelerating");
27 }
28 //滚动动画停止时执行,代码改变时出发,也就是setContentOffset改变时
29 - (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView;
30 {
31    NSLog(@"scrollViewDidEndScrollingAnimation");
32 }
33 //设置放大缩小的视图，要是uiscrollview的subview
34 - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView;   
35 {
36    NSLog(@"viewForZoomingInScrollView");
37     return viewA;//这里返回一个view.告诉代理将要对哪个view操作
38 }
39 //完成放大缩小时调用
40 - (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale; 
41 {
42     viewA.frame=CGRectMake(50,0, 100, 400);
43    NSLog(@"scale between minimum and maximum. called after any ‘bounce‘ animations");
44 }// scale between minimum and maximum. called after any ‘bounce‘ animations
45
46 //如果你不是完全滚动到滚轴视图的顶部，你可以轻点状态栏，那个可视的滚轴视图会一直滚动到顶部，那是默认行为，你可以通过该方法返回NO来关闭它
47 - (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView;   
48 {
49     NSLog(@"scrollViewShouldScrollToTop");
50    return YES;
51 }
52
53 - (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView;     
54 {
55     NSLog(@"scrollViewDidScrollToTop");　　}