UIView：如何检查触摸是否在开始的同一视图内结束

发布于 2024-11-03 03:11:12 字数 189 浏览 7 评论 0原文

在 AcaniUsers 中，我在 UITableView 内创建了一个由 ThumbView : UIView 实例组成的网格。所有 thumbViews 的宽度均为 kThumbSize。如何检测触摸是否在其开始的同一视图内结束？

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审判长 2024-11-10 03:11:12

在您使用的视图扩展中；

斯威夫特4：

open override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesEnded(touches, with: event)
    guard let touchPoint = touches.first?.location(in: self) else { return }
    guard self.bounds.contains(touchPoint) else { return }
    // Do items for successful touch inside the view
}

In the view extension you use;

Swift 4:

open override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesEnded(touches, with: event)
    guard let touchPoint = touches.first?.location(in: self) else { return }
    guard self.bounds.contains(touchPoint) else { return }
    // Do items for successful touch inside the view
}

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清风不识月 2024-11-10 03:11:12

以下方法有效，但我不确定这是否是最好的方法。我也这么认为。

由于所有 thumbViews 的宽度均为 kThumbSize，因此只需在 touchesEnded 中检查 locationInView 的 x 坐标UITouch 实例（假设 self.multipleTouchEnabled = NO）小于或等于 kThumbSize。这意味着触摸在 thumbView 内结束。无需检查 y 坐标，因为如果触摸垂直移动，则包含 thumbViews 的 tableView 会滚动并且触摸会被取消。

在 ThumbView : UIView（其实例是 UITableView 的子视图）中执行以下操作：

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"touchesEnded %@", touches);
    CGPoint touchPoint = [[touches anyObject] /* only one */ locationInView:self];
    if (touchPoint.x >= 0.0f && touchPoint.x <= kThumbSize) {
        [(ThumbsTableViewCell *)self.superview.superview thumbTouched:self];
    }
}

要一次仅注册一个 thumbView 上的触摸，您可以还可能想在 ThumbView 的 init 实例方法中设置 self.exclusiveTouch = YES;。

The following works, but I'm not sure if it's the best way to go about it. I think so though.

Since all thumbViews have a width of kThumbSize, just check in touchesEnded that the x-coordinate of the locationInView of the UITouch instance (assuming self.multipleTouchEnabled = NO) is less than or equal to kThumbSize. This means the touches ended inside the thumbView. No need to check the y-coordinate because if the touches move vertically, the tableView, which contains the thumbViews, scrolls and the touches are cancelled.

Do the following in ThumbView : UIView (whose instances are subviews of a UITableView):

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"touchesEnded %@", touches);
    CGPoint touchPoint = [[touches anyObject] /* only one */ locationInView:self];
    if (touchPoint.x >= 0.0f && touchPoint.x <= kThumbSize) {
        [(ThumbsTableViewCell *)self.superview.superview thumbTouched:self];
    }
}

To only register touches on one thumbView at a time, you also probably want to set self.exclusiveTouch = YES; in the init instance method of ThumbView.

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