NSTextField自定义对焦环

Question

是否有可能在可编辑的NSTextField中绘制自定义对焦环？我搜索了整个网络，但找不到工作解决方案。我将NSTextField分类并覆盖“drawFocusRingMask”，但没有任何结果。

我的目标是要实现像一个在Mac OS Adressbook对焦环（在编辑一个人）

Answer 1

此代码的NSTextField的子类作品：

- (void)awakeFromNib { 
    self.focusRingType = NSFocusRingTypeNone; 
} 

- (void)drawRect:(NSRect)dirtyRect { 
    [super drawRect:dirtyRect]; 

    BOOL focus = NO; 

    //check, if the NSTextField is focused 
    id firstResponder = self.window.firstResponder; 
    if ([firstResponder isKindOfClass:[NSTextView class]]) { 
     NSTextView *textView = (NSTextView*)firstResponder; 
     NSClipView *clipView = (NSClipView*)textView.superview; 
     NSTextField *textField = (NSTextField*)clipView.superview; 
     if (textField == self) 
      focus = YES; 
    } 

    if (focus) { 
     NSRect bounds = self.bounds; 
     NSRect outerRect = NSMakeRect(bounds.origin.x - 2, 
             bounds.origin.y - 2, 
             bounds.size.width + 4, 
             bounds.size.height + 4); 

     NSRect innerRect = NSInsetRect(outerRect, 1, 1); 

     NSBezierPath *clipPath = [NSBezierPath bezierPathWithRect:outerRect]; 
     [clipPath appendBezierPath:[NSBezierPath bezierPathWithRect:innerRect]]; 

     [clipPath setWindingRule:NSEvenOddWindingRule]; 
     [clipPath setClip]; 

     [[NSColor colorWithCalibratedWhite:0.6 alpha:1.0] setFill]; 
     [[NSBezierPath bezierPathWithRect:outerRect] fill]; 
    } 
} 

Answer 2

上面的回答是工作好！ 以下是雨燕3.0的版本，我转换

class MyTextField: NSTextField { 
override func awakeFromNib() { 
    self.focusRingType = NSFocusRingType.none 
} 

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

    var focus = false 

    if let firstResponder = self.window?.firstResponder { 
     if firstResponder.isKind(of: NSTextView.self) { 
      let textView = firstResponder as! NSTextView 
      if let clipView = textView.superview { 
       if let textField = clipView.superview { 
        if textField == self { 
         focus = true 
        } 
       } 
      } 
     } 
    } 

    if focus { 
     let bounds = self.bounds 
     let outerRect = NSMakeRect(bounds.origin.x - 2, bounds.origin.y - 2, bounds.size.width + 4, bounds.size.height + 4) 
     let innerRect = NSInsetRect(outerRect, 1, 1) 
     let clipPath = NSBezierPath(rect: outerRect) 
     clipPath.append(NSBezierPath(rect: innerRect)) 
     clipPath.windingRule = NSWindingRule.evenOddWindingRule 
     clipPath.setClip() 

     NSColor(calibratedWhite: 0.6, alpha: 1.0).setFill() 
     NSBezierPath(rect: outerRect).fill() 
     self.backgroundColor = NSColor(cgColor: CGColor(red: 1, green: 0.4, blue: 0.5, alpha: 0.4)) 
    } 

} 

}

以及如何使用是如下

textView.select(withFrame: textView.frame, editor: NSText(), delegate: self, start, 0, length: 3)