在iOS中从x，y查找对象

当iOS中给出（x，y）坐标时，如何找到窗口中存在的UIElement？我将拥有一个具有许多UI元素的视图控制器，并且我将得到x，y，我必须用它来查找视图中存在的元素。

一个视图可能在给定的

CGPoint

上有多个视图。此方法应返回在给定点存在的数组子视图

   -(NSArray*)viewsAtPoint:(CGPoint)point inView:(UIView*)view {
         NSArray *subviews = view.subviews;
         NSMutableArray *mutableArray = [[NSMutableArray alloc]init];
         for(UIView *subview in subviews) {
            CGPoint thisSubviewPoint = subview.frame.origin;
            if(thisSubviewPoint.x == point.x && thisSubviewPoint.y == point.y) {
             [mutableArray addObject:subview];
            }
         }
         return mutableArray;
      }

---

要获取特定点的视图列表，可以使用

-(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;
}

要获取特定点的最顶层视图，可以使用

-(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级子视图，并且没有嵌套的子视图

如果有嵌套的子视图，可以定义递归函数来查找最顶层的视图

-(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;
}

if（mutableArray.count！=0）{firstView=[mutableArray objectAtIndex:0]；}