在UILabel子类中概述UILabel文本

Question

我正在努力寻找一种方法来简单地为我的UILabel文本添加轮廓/笔触/轮廓.谈论围绕UILabel背景的文字字母的笔划.

我正在使用swift 3,我想直接将我的文本概述到我的子类中:UILabel.

我找到了多个答案,建议这样做:

let strokeTextAttributes = [
        NSStrokeColorAttributeName : UIColor.black,
        NSForegroundColorAttributeName : UIColor.white,
        NSStrokeWidthAttributeName : -4.0,
        NSFontAttributeName : UIFont.boldSystemFont(ofSize: 30)
    ]

    self.attributedText = NSMutableAttributedString(string: self.text!, attributes: strokeTextAttributes)

但问题是它不起作用.我的文字仍然相同,没有大纲......

谁能在这帮助我？那将是一件好事:)

非常感谢.干杯伙计们.

Answer 1

这段代码对我有用.

斯威夫特3

let strokeTextAttributes = [
  NSStrokeColorAttributeName : UIColor.black,
  NSForegroundColorAttributeName : UIColor.white,
  NSStrokeWidthAttributeName : -4.0,
  NSFontAttributeName : UIFont.boldSystemFont(ofSize: 30)
] as [String : Any]

myLabel.attributedText = NSMutableAttributedString(string: "Test me i have color.", attributes: strokeTextAttributes)

Swift 4.2

let strokeTextAttributes = [
  NSAttributedString.Key.strokeColor : UIColor.red,
  NSAttributedString.Key.foregroundColor : UIColor.white,
  NSAttributedString.Key.strokeWidth : -4.0,
  NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 30)]
  as [NSAttributedString.Key : Any]

labelOutLine.attributedText = NSMutableAttributedString(string: "Your outline text", attributes: strokeTextAttributes)

Answer 2

在这里你有课程实现,复制和粘贴到playgrond测试:

    class StrokedLabel: UILabel {

        var strockedText: String = "" {
            willSet(newValue) {
                let strokeTextAttributes = [
                    NSStrokeColorAttributeName : UIColor.black,
                    NSForegroundColorAttributeName : UIColor.white,
                    NSStrokeWidthAttributeName : -4.0,
                    NSFontAttributeName : UIFont.boldSystemFont(ofSize: 30)
                    ] as [String : Any]

                let customizedText = NSMutableAttributedString(string: newValue,
                                                               attributes: strokeTextAttributes)


                attributedText = customizedText
            }
        }
    }


//////////// PLAYGROUND IMPLEMENTATION PART /////////
    let text = "Stroked text"

// UILabel subclass initialization
    let label = StrokedLabel(frame: CGRect(x: 0, y: 0, width: 200, height: 50))
// simple assign String to 'strockedText' property to see the results
    label.strockedText = text

    label.backgroundColor = UIColor.white


    label

Swift 4.2

import UIKit

class StrokedLabel: UILabel {

var strockedText: String = "" {
    willSet(newValue) {
        let strokeTextAttributes : [NSAttributedString.Key : Any] = [
            NSAttributedString.Key.strokeColor : UIColor.black,
            NSAttributedString.Key.foregroundColor : UIColor.white,
            NSAttributedString.Key.strokeWidth : -4.0,
            NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 30)
            ] as [NSAttributedString.Key  : Any]

        let customizedText = NSMutableAttributedString(string: newValue,
                                                       attributes: strokeTextAttributes)


        attributedText = customizedText
    }
}

}

//////////// PLAYGROUND IMPLEMENTATION PART /////////
  let text = "Stroked text"

  // UILabel subclass initialization
  let label = StrokedLabel(frame: CGRect(x: 0, y: 0, width: 200, height: 50))
  // simple assign String to 'strockedText' property to see the results
  label.strockedText = text

  label.backgroundColor = UIColor.clear


  label

也许欢迎对这门课进行重构,但是应该以这种形式为你工作

如您所见,使用非常方便.

Answer 3

@anandnimje回答转换为Swift 4.2并将其包装成一个函数:

public func stroke(font: UIFont, strokeWidth: Float, insideColor: UIColor, strokeColor: UIColor) -> [NSAttributedStringKey: Any]{
    return [
        NSAttributedStringKey.strokeColor : strokeColor,
        NSAttributedStringKey.foregroundColor : insideColor,
        NSAttributedStringKey.strokeWidth : -strokeWidth,
        NSAttributedStringKey.font : font
        ]
}

用法:

label.attributedText = NSMutableAttributedString(string: "Hello World", 
attributes: stroke(font: UIFont(name: "SourceSansPro-Black", size: 20)!, 
strokeWidth: 4, insideColor: .white, strokeColor: .black))

确保您的UIFont名称正确,否则崩溃.如果你有正确的名字,永远不应该是一个问题.