斯威夫特NSTextField文本消失

这个问题可能存在于一个6岁的职位在objective-c。我还没有找到最近的答案或问题，或者用Swift编写的问题。斯威夫特NSTextField文本消失

我正在使用故事板，并且我有子类NSTextField。出于某种原因，当我点击该字段时，占位符显示，当我输入文本并单击时，文本消失。文本实际上存在，因为当我再次点击时，输入的文本仍然存在。看来这是某种类型的渲染问题，即某个图层正在覆盖文本值？很奇怪。我正在使用NSTrackingArea并且还添加了CALayer。

这里发生了什么的截图：

这里是我的代码：

class NowTextField: NSTextField { 

    override func draw(_ dirtyRect: NSRect) { 
     super.draw(dirtyRect) 

     // required nonsense 
     let textFieldLayer = CALayer() 
     let textFieldRect = NSRect(x: 0, y: 0, width: 120, height: 32) 
     let textFieldTrackingArea = NSTrackingArea.init(rect: textFieldRect, options: [NSTrackingAreaOptions.activeInActiveApp, NSTrackingAreaOptions.mouseEnteredAndExited], owner: self, userInfo: nil) 
     self.wantsLayer = true 
     self.layer = textFieldLayer 
     self.addTrackingArea(textFieldTrackingArea) 

     // styling 
     self.textColor = NSColor.darkGray 
     self.layer?.cornerRadius = 4 
     self.layer?.backgroundColor = NSColor.white.cgColor 
     self.layer?.borderColor = NSColor.lightGray.cgColor 
     self.layer?.borderWidth = 2 
     self.drawsBackground = false 
    } 

    override func mouseEntered(with event: NSEvent) { 
     self.textColor = NSColor.darkGray 
     self.layer?.cornerRadius = 4 
     self.layer?.backgroundColor = NSColor.white.cgColor 
     self.layer?.borderColor = NSColor.highlightBlue.cgColor 
     self.layer?.borderWidth = 2 
     self.drawsBackground = false 
    } 

    override func mouseExited(with event: NSEvent) { 
     self.textColor = NSColor.darkGray 
     self.layer?.cornerRadius = 4 
     self.layer?.backgroundColor = NSColor.white.cgColor 
     self.layer?.borderColor = NSColor.lightGray.cgColor 
     self.layer?.borderWidth = 2 
     self.drawsBackground = false 
    } 
}

来源

2017-06-06 Steven Schafer

设置文本字段中的init方法或'awakeFromNib（）的'，而不是在每一个'draw'。 – Willeke

不幸的是，这并没有解决问题。添加到'awakeFromNib（）'时，所有内容都是相同的 –

我找到了答案。我删除了let textFieldLayer = CALayer()以及self.layer = textFieldLayer，因为它们似乎在文本字段的顶部添加了不必要的图层。这是我的工作版本全码：

class NowTextField: NSTextField { 

override func draw(_ dirtyRect: NSRect) { 
    super.draw(dirtyRect) 

    // required nonsense 
    let textFieldRect = NSRect(x: 0, y: 0, width: 120, height: 32) 
    let textFieldTrackingArea = NSTrackingArea.init(rect: textFieldRect, options: [NSTrackingAreaOptions.activeInActiveApp, NSTrackingAreaOptions.mouseEnteredAndExited], owner: self, userInfo: nil) 
    self.wantsLayer = true 
    self.addTrackingArea(textFieldTrackingArea) 

    // styling 
    self.textColor = NSColor.darkGray 
    self.layer?.cornerRadius = 4 
    self.layer?.backgroundColor = NSColor.white.cgColor 
    self.layer?.borderColor = NSColor.lightGray.cgColor 
    self.layer?.borderWidth = 2 
    self.drawsBackground = false 
} 

override func mouseEntered(with event: NSEvent) { 
    self.textColor = NSColor.darkGray 
    self.layer?.cornerRadius = 4 
    self.layer?.backgroundColor = NSColor.white.cgColor 
    self.layer?.borderColor = NSColor.highlightBlue.cgColor 
    self.layer?.borderWidth = 2 
    self.drawsBackground = false 
} 

override func mouseExited(with event: NSEvent) { 
    self.textColor = NSColor.darkGray 
    self.layer?.cornerRadius = 4 
    self.layer?.backgroundColor = NSColor.white.cgColor 
    self.layer?.borderColor = NSColor.lightGray.cgColor 
    self.layer?.borderWidth = 2 
    self.drawsBackground = false 
}

}

来源

2017-06-06 23:11:59

斯威夫特NSTextField文本消失

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