在NSImageView的顶部添加CATextLayer [英] Add CATextLayer on Top of NSImageView

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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