UIScrollView 添加手势点击事件 - iOS

为 UIScrollView 添加手势事件，通过屏幕宽度与 UIScrollView 的偏移量 contentOffset 的方式获取对应的当前滚动页面点击事件，具体 code 如下：
首先，创建 UIScrollView 实现简易的基础控件并绑定手势事件进行监听

#pragma mark - ************************************ UI
- (UIScrollView *)carouselScrView {
    if (!_carouselScrView) {
        NSInteger scrViewHeight = SCREEN_HEIGHT / 3;
        UIScrollView *scrView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, scrViewHeight)];
        scrView.backgroundColor = [UIColor lightGrayColor];
        scrView.delegate = self;
        scrView.pagingEnabled = YES;// 设置是否可以分页滚动
        scrView.bounces = NO;// 设置不能滚动到边界外面，当然你也可以只设置某一个方向滚动到边界外面(这里指的是手拖)
        scrView.showsHorizontalScrollIndicator = NO;// 设置是否显示水平和垂直显示条
        scrView.showsVerticalScrollIndicator = NO;
        
        NSArray *arrData = @[@"1",@"2",@"3",@"4"];
        for (NSInteger i = 0; i < arrData.count; i++) {
            UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(i * SCREEN_WIDTH, 0, SCREEN_WIDTH, scrViewHeight)];
            imgView.userInteractionEnabled = YES;
            imgView.image = [[UIImage imageNamed:arrData[i]] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
            // 绑定手势监听
            UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapHotScrWithEvent:)];
            tapGesture.delegate = self;
            tapGesture.numberOfTouchesRequired = 1;// 设计点按次数，默认为1
            tapGesture.numberOfTapsRequired = 1;// 点按手指数
            
            [imgView addGestureRecognizer:tapGesture];
            [scrView addSubview:imgView];
        }
        
        scrView.contentSize = CGSizeMake(arrData.count * SCREEN_WIDTH, scrViewHeight);
        
        _carouselScrView = scrView;
    }
    return _carouselScrView;
}

其次，处理绑定的手势事件 action

#pragma mark - ************************************ Event
- (void)tapHotScrWithEvent:(UITapGestureRecognizer *)tap {
    // 屏幕的偏移量
    CGFloat x = self.carouselScrView.contentOffset.x;
    // 屏幕的宽
    CGFloat  w = CGRectGetWidth(self.carouselScrView.frame);
    // 偏移量除以宽，得到当前的页数
    NSInteger  curPage = x/w;
    
    NSLog(@"轮播图被点击了：%ld", (long)curPage);
}

最后，基础的声明、设置代理和调用实现的部分

@interface YHDemoVC () <UIScrollViewDelegate, UIGestureRecognizerDelegate>

// 轮播图
@property (nonatomic, strong) UIScrollView *carouselScrView;

@end

@implementation YHDemoVC

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self.view addSubview:self.tabView];
}

以上便是此次分享的全部内容，希望能对大家有所帮助！