UITapGestureRecognizer 区分多指单双击

最新推荐文章于 2018-04-29 09:45:55 发布

转载最新推荐文章于 2018-04-29 09:45:55 发布 · 5k 阅读

文章标签：

#action

iPhone 专栏收录该内容

21 篇文章

订阅专栏

本文介绍了一种使用Objective-C实现的触摸手势识别方法，通过不同类型的UITapGestureRecognizer来区分单击、双击及多指操作，并通过delegate设置手势间的优先级。

    - (void)viewDidLoad {
        
        UITapGestureRecognizer *singleTapOne = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
        singleTapOne.numberOfTouchesRequired = 1; singleTapOne.numberOfTapsRequired = 1; singleTapOne.delegate = self;
        
        UITapGestureRecognizer *singleTapTwo = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
        singleTapTwo.numberOfTouchesRequired = 2; singleTapTwo.numberOfTapsRequired = 1; singleTapTwo.delegate = self;
        
        UITapGestureRecognizer *doubleTapOne = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
        doubleTapOne.numberOfTouchesRequired = 1; doubleTapOne.numberOfTapsRequired = 2; doubleTapOne.delegate = self;
        
        UITapGestureRecognizer *doubleTapTwo = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
        doubleTapTwo.numberOfTouchesRequired = 2; doubleTapTwo.numberOfTapsRequired = 2; doubleTapTwo.delegate = self;
        
        [singleTapOne requireGestureRecognizerToFail:doubleTapOne]; // Single tap requires double tap to fail
        [singleTapTwo requireGestureRecognizerToFail:doubleTapTwo];
        
        [self.view addGestureRecognizer:singleTapOne]; [singleTapOne release];
        [self.view addGestureRecognizer:singleTapTwo]; [singleTapTwo release];
        [self.view addGestureRecognizer:doubleTapOne]; [doubleTapOne release];
        [self.view addGestureRecognizer:doubleTapTwo]; [doubleTapTwo release];
        
        
        [super viewDidLoad];
    }
    - (void)handleSingleTap:(UITapGestureRecognizer *)sender {
        if (sender.numberOfTouchesRequired == 1) {
            NSLog(@"Single Tap with a finger.");
        }
        else if (sender.numberOfTouchesRequired == 2) {
            NSLog(@"Single Tap with two finger.");
        }
    }
    - (void)handleDoubleTap:(UITapGestureRecognizer *)sender {
        if (sender.numberOfTouchesRequired == 1) {
            NSLog(@"Double Tap with a finger.");
        }
        else if (sender.numberOfTouchesRequired == 2) {
            NSLog(@"Double Tap with two finger.");
        }
    }