如何返回被触摸的子视图

时间:2012-12-17 20:53:02

标签: objective-c ios

我在这里搜索并看到很多答案,说打开userInteractionEnabled属性。我已经做到了。

我以编程方式创建子视图(不在Interface Builder中)。子视图是UIView的自定义子类(称为PieceSuperClass)。

我想要的只是看起来像

UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self.view];

UIView *hitView = [self.view hitTest:currentPosition withEvent:event];

if ([hitView isKindOfClass:[PieceSuperClass class]]) {
    return hitView;
}

出于某种原因,hitView isKindOfClass UIImageView即使我绝对将其声明为PieceSuperClass。 'PieceSuperClass'是UIImageView的子类。

// Draw proper piece 
UIImage *pieceImage = [UIImage imageNamed:[NSString stringWithFormat:@"%@%@.png", pieceColor, pieceName]]; 
PieceSuperClass *pieceImageView = [[PieceSuperClass alloc] initWithFrame:CGRectMake(0, 0, 39, 38)]; 
pieceImageView.image = pieceImage; 
pieceImageView.identifier = [NSString stringWithFormat:@"%@%@%@", pieceColor, pieceName, pieceNumber]; 
pieceImageView.userInteractionEnabled = YES; 
[boardView addSubview:pieceImageView];

3 个答案:

答案 0 :(得分:0)

我认为您正在使用当前位置跟踪错误的视图。如果PieceSuperClass是你的self.view的子视图,你应该跟踪它:

CGPoint currentPosition = [touch locationInView:self.view.subviews];

答案 1 :(得分:0)

这来自UITouch Documentation

  

最初发生触摸的视图。 (只读)

     

@property(非原子,只读,保留)UIView * view

因此,您可以知道触摸了哪个视图,只需执行此操作:

UIView *hitView = touch.view;
if ([hitView isKindOfClass:[PieceSuperClass class]]) {
    return hitView;
}

答案 2 :(得分:0)

想出来!

- (id)whichPieceTouched:touches withEvent:event
{
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self.view];

for (int i = 0; i < [piecesArray count]; i++) {
    if (CGRectContainsPoint([[piecesArray objectAtIndex:i] frame], currentPosition)) {
        return [piecesArray objectAtIndex:i];
        }
    }
}

虽然我有一个挥之不去的问题:它似乎总是选择下方约20个像素的对象(或下一个对象)。

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