//  ViewController.m

//  05-UIScrollView的代理(delegate)

#import "ViewController.h"

@interface ViewController () <UIScrollViewDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // 1.UIScrollView

    UIScrollView *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UIImageView

    UIImage *image = [UIImage imageNamed:@"minion"];

    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];

    [scrollView addSubview:imageView];

    // 2.设置contenSize

    scrollView.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");

}