如何检测手指移入或移出我的自定义 UIView

Posted 2023-03-13

【中文标题】如何检测手指移入或移出我的自定义 UIView

【英文标题】：How to detect finger moves in or out my customized UIView

【发布时间】：2013-12-17 08:18:42

【问题描述】：

我有一个自定义的 UIView

@interface EColumn : UIView

我在它的超级视图中有很多这个 EColumn 的实例。

如何检测手指何时按住并在此 UIView 区域内移动，以及何时移出。

我不是指点击手势，我可以使用这个来检测点击手势：

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(taped:)];
        [self addGestureRecognizer:tapGesture];

【参考方案1】：

@implementation EColumn

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

    UIView *view = [self touchedViewWithTouches:touches andEvent:event];
    NSLog(@"%@",view);


- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

    UIView *view = [self touchedViewWithTouches:touches andEvent:event];
    NSLog(@"%@",view);


- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

    UIView *view = [self touchedViewWithTouches:touches andEvent:event];
    NSLog(@"%@",view);


- (UIView *)touchedViewWithTouches:(NSSet *)touches andEvent:(UIEvent *)event

    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:touch.view];

    UIView *touchedView;

    for (UIView *view in self.subviews)
    
        if(CGRectContainsPoint(view.frame, touchLocation))
        
            touchedView = view;
            break;
        
    

    return touchedView;


@end

【参考方案2】：

您可以使用 UILongPressGestureRecognizer 检测特定时间的手指按住。为此，您还可以指定 minimumPressDuration 和 numberOfTouchesRequired

UILongPressGestureRecognizer *longPressRecognizer = 
         [[UILongPressGestureRecognizer alloc]
         initWithTarget:self 
         action:@selector(longPressDetected:)];
    longPressRecognizer.minimumPressDuration = 3;
    longPressRecognizer.numberOfTouchesRequired = 1;
    [self addGestureRecognizer:longPressRecognizer];

要检测移动，您可以使用 UIPanGestureRecognizer

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
    [panRecognizer setMinimumNumberOfTouches:1];
    [panRecognizer setMaximumNumberOfTouches:1];
    [self addGestureRecognizer:panRecognizer];