UITapGestureRecognizer

最新推荐文章于 2018-04-29 09:45:24 发布

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本文介绍如何使用UIKit框架中的UITapGestureRecognizer来实现iOS应用中的不同触控手势识别，包括单指单击、单指双击、双指单击及双指双击等，并展示了如何设置手势的触发条件以及避免手势冲突。

//单指单击

2: UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc]initWithTarget:self

3: action:@selector(handleSingleFingerEvent:)];

4: singleFingerOne.numberOfTouchesRequired = 1; //手指数

5: singleFingerOne.numberOfTapsRequired = 1; //tap次数

6: singleFingerOne.delegate = self;

7:

8: //单指双击

9: UITapGestureRecognizer *singleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self

10: action:@selector(handleSingleFingerEvent:)];

11: singleFingerTwo.numberOfTouchesRequired = 1;

12: singleFingerTwo.numberOfTapsRequired = 2;

13: singleFingerTwo.delegate = self;

14:

15: //双指单击

16: UITapGestureRecognizer *doubleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self

17: action:@selector(handleDoubleFingerEvent:)];

18: doubleFingerOne.numberOfTouchesRequired = 2;

19: doubleFingerOne.numberOfTapsRequired = 1;

20: doubleFingerOne.delegate = self;

21:

22: UITapGestureRecognizer *doubleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self

23:    action:@selector(handleDoubleFingerEvent:)];

24: doubleFingerTwo.numberOfTouchesRequired = 2;

25: doubleFingerTwo.numberOfTapsRequired = 2;

26: doubleFingerTwo.delegate = self;

27:

28: //如果不加下面的话，当单指双击时，会先调用单指单击中的处理，再调用单指双击中的处理

29: [singleFingerOne requireGestureRecognizerToFail:singleFingerTwo];

30: //同理双指亦是如此

31: [doubleFingerOne requireGestureRecognizerToFail:doubleFingerTwo];

32:

33: [self.view addGestureRecognizer:singleFingerOne];

34: [self.view addGestureRecognizer:singleFingerTwo];

35: [self.view addGestureRecognizer:doubleFingerOne];

36: [self.view addGestureRecognizer:doubleFingerTwo];

37:

38: [singleFingerOne release];

39: [singleFingerTwo release];

40: [doubleFingerOne release];

41: [doubleFingerTwo release];