ios - Swift:在另一个 UIView 下对 UIView 进行 hitTest

Question

我在 RedOrGreenUIView 之上有 TransparentUIView。 TransparentUIView 有一个 UILongPressGestureRecognizer 附加到它。一旦用户开始长按它，我检查这个 LongPressGesture 的 .Changed 状态，并执行下面的 hitTest:

var p:CGPoint = rec.locationInView(self.view)
var selectedView = view.hitTest(p, withEvent: nil)
if selectedView != nil {
   if selectedView == TransparentUIView {
       println("TransparentUIView is being touched")
   }
}

我将 TransparentView 作为 selectedView 正常。但是我需要能够同时对 RedOrGreenUIView 进行 hitTest，它位于 TransparentUIView 之下。我无法全神贯注地完成这项工作。请帮忙。

Answer 1

为您的容器创建自定义 View 并覆盖 pointInside: 消息以在点不在符合条件的 subview 内时返回 NO，如下所示:

@interface PassthroughView : UIView
@end

@implementation PassthroughView
-(BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    for (UIView *view in self.subviews) {
        if (!view.hidden && view.alpha > 0 && view.userInteractionEnabled && [view pointInside:[self convertPoint:point toView:view] withEvent:event])
            return YES;
    }
    return NO;
}
@end

快速版本

class PassThroughView: UIView {

     override func pointInside(point: CGPoint, withEvent event: UIEvent?) -> Bool {
            for subview in subviews as [UIView] {
                if !subview.hidden && subview.alpha > 0 && subview.userInteractionEnabled && subview.pointInside(convertPoint(point, toView: subview), withEvent: event) {
                    return true
                }
            }
            return false
        }
    }