将subLayer添加到imageView.layer [英] add subLayer to a imageView.layer

问题描述

好吧，我知道每个imageViews都有一个图层（我们可以通过：imageView.layer访问它）。我想使用我的 imageView 的图层并添加一个subLayer所在的层： shapeLayer （即CAShapeLayer）我的代码不起作用，它不显示形状层！

well I know that every imageViews have a layer (we can access it with :imageView.layer).I would like to use the layer of my imageView and add a subLayer to it's layer:shapeLayer(that is a CAShapeLayer) My code doesn't work, it doesn't show the shape layer!

- (void)viewDidLoad 
{
   imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
   [self.view addSubview:imageView];
}

- (void)anotherMethod
{
   [imageView.layer addSublayer:shapeLayer];
}

请问如何解决？

推荐答案

尝试一下：

[outputImage.layer insertSublayer:shapeLayer atIndex:0];

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