在iOS中从x，y查找对象 [英] FInd the object from x,y in iOS

问题描述

当在iOS中给出（x，y）坐标时，如何查找窗口中存在哪个UIElement？我将拥有一个包含许多UI元素的视图控制器，并且将得到x，y，我必须使用x，y查找视图中存在的元素。

How to find which UIElement is present in the window when (x,y) coordinates is given in iOS ? I will be having a view controller with many UI elements and I will be given x,y with which I have to find the element present in the view .

推荐答案

要获取可以使用的特定点的视图列表，

To get a list of views at a particular point you can use,

-(NSArray*)subviewsAtPoint:(CGPoint)point inView:(UIView*)view {

    NSMutableArray *viewsAtPoint = [[NSMutableArray alloc]init];
    for(UIView *subview in view.subviews) {

        if(CGRectContainsPoint(subview.frame, point))
            [viewsAtPoint addObject:subview];
    }
    return viewsAtPoint;
}

要获得特定位置的最高视图，可以使用

To get the topmost view at a particular point, you can use

-(UIView *)topmostViewAtPoint:(CGPoint)point inView:(UIView*)view {

    for(UIView *subview in view.subviews.reverseObjectEnumerator) {

        if(CGRectContainsPoint(subview.frame, point))
            return subview;
    }
    return view;
}

上面的代码假设只有一个子视图级别，没有子视图嵌套子视图。

The above code assumes that there is only one level of subviews and there are no nested subviews.

如果您有嵌套子视图，则可以定义一个递归函数以找到最顶层的视图。

If you have nested subviews, you can define a recursive function to find the topmost view.

-(UIView *)topmostViewAtPoint:(CGPoint)point inView:(UIView*)view {

    for(UIView *subview in view.subviews.reverseObjectEnumerator) {

        if(CGRectContainsPoint(subview.frame, point))
        {
            CGPoint innerPoint = [self.view convertPoint:point toView:subview];
            [self topmostViewAtPoint:innerPoint inView:subview];
        }
     }
    return view;
}

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