iOS手势-UILongPressGestureRecognizer

1. UILongPressGestureRecognizer（长按）基本介绍

• 父类是UIGestureRecognizer
• 一般开发中,长按操作只会做一次
• 假设在一开始长按的时候就做一次操作
• 默认调用两次

2. UILongPressGestureRecognizer应用举例

- (void)setUpLongPress
{
    // 长按
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];

    [self.imageView addGestureRecognizer:longPress];
}

// 长按图片的时候就会触发长按手势
- (void)longPress:(UILongPressGestureRecognizer *)longPress
{
    // 一般开发中,长按操作只会做一次
    // 假设在一开始长按的时候就做一次操作

    if (longPress.state == UIGestureRecognizerStateBegan) {

        NSLog(@"%ld",longPress.state);
    }
}

3. UILongPressGestureRecognizer属性

// 要求的点击次数，默认为0次
@property (nonatomic) NSUInteger numberOfTapsRequired;      // Default is 0.

// 要求的手指数量，默认为1个
@property (nonatomic) NSUInteger numberOfTouchesRequired __TVOS_PROHIBITED;

// 最小的按压持续时间，默认是0.5秒
@property (nonatomic) CFTimeInterval minimumPressDuration;

// 允许识别过程中手指移动的最大距离，默认是10
@property (nonatomic) CGFloat allowableMovement;           // Default is 10. Maximum movement in pixels allowed before the gesture fails. Once recognized (after minimumPressDuration) there is no limit on finger movement for the remainder of the touch tracking