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我有两个 uiviews 与内部一些奇怪形状的 png 重叠。我想在每个 uiview 的顶部绘制一个不可见的形状，并检测我是否点击了这些形状。否则，可以通过重叠看到水龙头。我认为我下面的代码会允许这种情况发生，但根本没有显示任何内容。

-(void)drawRect:(CGRect)rect {
    quadrantOnePath = CGPathCreateMutable();
    CGPathMoveToPoint(quadrantOnePath, NULL, 30, 214);
    CGPathAddLineToPoint(quadrantOnePath, NULL, 281, 47);
    CGPathAddLineToPoint(quadrantOnePath, NULL, 493, 51);
    CGPathAddLineToPoint(quadrantOnePath, NULL, 306, 376);
    CGPathCloseSubpath(quadrantOnePath);
}

//in viewdidload

UITapGestureRecognizer *tapBlueRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(viewBlueFloorplans:)];
[tapBlueRecognizer setNumberOfTapsRequired:1];
[tapBlueRecognizer setDelegate:self];
[floorBlueHolderview addGestureRecognizer:tapBlueRecognizer];


// viewbluefunction
-(void)viewBlueFloorplans:(id)sender meso:(UIGestureRecognizer *)recognizer {

   CGPoint factor = [recognizer locationOfTouch:0 inView:self.view];
   bool processTouch = CGPathContainsPoint(quadrantOnePath, NULL, factor, true);

   if(processTouch) {
    NSLog(@"tap_viewBLU");
   }
}
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1 回答 1

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1，您实际上不必绘制形状即可在其上使用 CGPathContainsPoint。如果你知道形状是正确的然后放

quadrantOnePath = CGPathCreateMutable();
CGPathMoveToPoint(quadrantOnePath, NULL, 30, 214);
CGPathAddLineToPoint(quadrantOnePath, NULL, 281, 47);
CGPathAddLineToPoint(quadrantOnePath, NULL, 493, 51);
CGPathAddLineToPoint(quadrantOnePath, NULL, 306, 376);
CGPathCloseSubpath(quadrantOnePath);

如果形状没有改变，则进入“viewdidload”。（为了防止内存泄漏，不要忘记释放 quadrantOnePath）如果你不想调试形状，那就画吧。

2、@selector(viewBlueFloorplans:)不会打电话-(void)viewBlueFloorplans:(id)sender meso:(UIGestureRecognizer *)recognizer

@selector(viewBlueFloorplans:)将会通知-(void)viewBlueFloorplans:(UIGestureRecognizer *)recognizer

3、如果你没有真正实现委托方法，那么[tapBlueRecognizer setDelegate:self];就不应该设置（为了节省一些计算）。

于 2012-04-19T11:49:04.737 回答