如何更改UITextField上清除按钮的色调颜色 [英] How to change the tint color of the clear button on a UITextField

问题描述

我的UITextfield上有一个自动生成的清除按钮，默认为蓝色色调。我无法将色调颜色更改为白色。我尝试修改故事板和代码但没有成功，我不想使用自定义图像。

I have an auto-generated clear button on my UITextfield, with the default blue tint color. I cannot change the tint color to white. I have tried modifying the storyboard and code without success, and I do not want to use a custom image.

如何更改默认的清除按钮色调颜色而不使用自定义图片？

How can I change the default clear button tint color without using a custom image?

推荐答案

你走了！

TintTextField。

A TintTextField.

不使用自定义图像或添加按钮等。

Using no custom image, or added buttons etc.

class TintTextField: UITextField {

  var tintedClearImage: UIImage?

  required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    setupTintColor()
  }

  override init(frame: CGRect) {
    super.init(frame: frame)
    setupTintColor()
  }

  func setupTintColor() {
    clearButtonMode = UITextFieldViewMode.WhileEditing
    borderStyle = UITextBorderStyle.RoundedRect
    layer.cornerRadius = 8.0
    layer.masksToBounds = true
    layer.borderColor = tintColor.CGColor
    layer.borderWidth = 1.5
    backgroundColor = UIColor.clearColor()
    textColor = tintColor
  }

  override func layoutSubviews() {
    super.layoutSubviews()
    tintClearImage()
  }

  private func tintClearImage() {
    for view in subviews as! [UIView] {
      if view is UIButton {
        let button = view as! UIButton
        if let uiImage = button.imageForState(.Highlighted) {
          if tintedClearImage == nil {
            tintedClearImage = tintImage(uiImage, tintColor)
          }
          button.setImage(tintedClearImage, forState: .Normal)
          button.setImage(tintedClearImage, forState: .Highlighted)
        }
      }
    }
  }
}


func tintImage(image: UIImage, color: UIColor) -> UIImage {
  let size = image.size

  UIGraphicsBeginImageContextWithOptions(size, false, image.scale)
  let context = UIGraphicsGetCurrentContext()
  image.drawAtPoint(CGPointZero, blendMode: CGBlendMode.Normal, alpha: 1.0)

  CGContextSetFillColorWithColor(context, color.CGColor)
  CGContextSetBlendMode(context, CGBlendMode.SourceIn)
  CGContextSetAlpha(context, 1.0)

  let rect = CGRectMake(
    CGPointZero.x,
    CGPointZero.y,
    image.size.width,
    image.size.height)
  CGContextFillRect(UIGraphicsGetCurrentContext(), rect)
  let tintedImage = UIGraphicsGetImageFromCurrentImageContext()
  UIGraphicsEndImageContext()

  return tintedImage
}

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