//  ViewController.m
//  05-UIScrollView的代理(delegate)#import "ViewController.h"@interface ViewController () <UIScrollViewDelegate>@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];// 1.UIScrollViewUIScrollView *scrollView = [[UIScrollView alloc] init];scrollView.backgroundColor = [UIColor redColor];scrollView.frame = CGRectMake(0, 20, 300, 200);[self.view addSubview:scrollView];// 注意点:通过代码创建scrollView,一开始subviews这个数组为nil
//    NSLog(@"%@",scrollView.subviews);// 1.创建UIImageViewUIImage *image = [UIImage imageNamed:@"minion"];UIImageView *imageView = [[UIImageView alloc] initWithImage:image];[scrollView addSubview:imageView];// 2.设置contenSizescrollView.contentSize = image.size;// 3.设置代理scrollView.delegate = self;
}#pragma mark - UIScrollViewDelegate 代理方法
/***  当scrollView正在滚动的时候就会自动调用这个方法*/
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
//    NSLog(@"scrollViewDidScroll--");
}/***  用户即将开始拖拽scrollView时就会调用这个方法*/
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{NSLog(@"scrollViewWillBeginDragging-");
}/***  用户即将停止拖拽scrollView时就会调用这个方法*/
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
//    NSLog(@"scrollViewWillEndDragging");
}/***  用户已经停止拖拽scrollView时就会调用这个方法*/
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{if (decelerate == NO) {NSLog(@"用户已经停止拖拽scrollView,停止滚动");} else {NSLog(@"用户已经停止拖拽scrollView,但是scrollView由于惯性会继续滚动,减速");}
}/*** scrollView减速完毕会调用,停止滚动*/
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{NSLog(@"scrollView减速完毕会调用,停止滚动");
}