本文介绍了在NSImageView的顶部添加CATextLayer的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我试图在NSImage顶部显示文本.我使用以下代码
I'm trying to display text on top of an NSImage.I use the following code
let myTextLayer = CATextLayer()
myTextLayer.string = "My text"
myTextLayer.foregroundColor = NSColor.cyan.cgColor
myTextLayer.frame = self.img_view.bounds
self.img_view.layer=myTextLayer;
这将继续产生空的NSImageView
This keeps producing empty NSImageView
推荐答案
在使用图层之前,您需要明确说出NSImageView
wantsLayer
,如下所示
You needs explicitly say NSImageView
wantsLayer
before use layers, like below
self.img_view.wantsLayer = true
let myTextLayer = CATextLayer()
myTextLayer.string = "My text"
myTextLayer.foregroundColor = NSColor.cyan.cgColor
myTextLayer.frame = self.img_view.bounds
self.img_view.layer.addSublayer(myTextLayer)
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