IOS基础控件--滚动视图 UIScrollView和UIScrollViewDelegate协议

UIScrollView 滚动视图

#import "ViewController.h"

#import "GlobalDefine.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    //滚动视图
    UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, SCREENWIDTH, SCREENHEIGHT)];
    //图片内容的宽高
    scrollView.contentSize = CGSizeMake(5 * SCREENWIDTH, SCREENHEIGHT);
    //启用分页
    scrollView.pagingEnabled = YES;
    //弹动
    scrollView.bounces = NO;
    
    [self.view addSubview:scrollView];
    
    //添加5张图片
    for (int i = 0; i < 5; ++i)
    {
        UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(i * SCREENWIDTH, 0, SCREENWIDTH, SCREENHEIGHT)];
        imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.png", i]];
        [scrollView addSubview:imageView];
    }
}

UIScrollViewdDelegate协议

- (void)viewDidLoad
{
    [super viewDidLoad];

    //写相关代码

    //遵循协议代理
    scrollView.delegate = self;
}


//常用方法
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    NSLog(@"滑动时执行");
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
    NSLog(@"结束拖拽时执行");
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"单个滑动结束时执行");
    //scrollView.contentOffset.x和scrollView.contentOffser.y计算内容偏移的坐标
}