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GaoYu
V2EX  ›  iDev

对 NSAttributedString 进行封装, 使用超方便

  •  
  •   GaoYu · 2017-06-19 11:53:23 +08:00 · 2963 次点击
    这是一个创建于 2475 天前的主题,其中的信息可能已经有所发展或是发生改变。

    每次使用NSAttributedString的时候, 总会写一大堆臃肿的代码, 一般我们会写到Extensioncategory中,对String, NSAttributedString进行扩展, 然后调用起来稍微方便一些..

    或者你也可以这样进行扩展

    extension UILabel {
        convenience init(frame: CGRect = .zero, attributedText: String, textColor: UIColor, font: UIFont, lineSpacing: CGFloat) {
            self.init(frame: frame)
            let paragraphStyle = NSMutableParagraphStyle()
            paragraphStyle.lineSpacing = lineSpacing
            paragraphStyle.lineBreakMode = .byTruncatingTail
            let attrStr = NSAttributedString(string: attributedText, attributes: [NSParagraphStyleAttributeName: paragraphStyle,
                                                                                  NSFontAttributeName: font,
                                                                                  NSForegroundColorAttributeName: textColor])
            self.attributedText = attrStr
        }
    }
    

    这里我对NSAttributedString的所有属性都进行了简单的封装, 让开发者使用起来超方便

    项目地址 如果你喜欢的话, 欢迎 star

    使用方法如下:

    // 1. shadow: you can set range, default allRange
    label1.attributedText = content.toAttributed.shadow {
        $0.shadowColor = UIColor.red
        $0.shadowOffset = CGSize(width: 3, height: 3)
        $0.shadowBlurRadius = 2.0
    }.rawValue
    
    
    // 2. paragraphStyle: you can set range, default allRange
    label2.attributedText = content.toAttributed.paragraph {
        $0.alignment = .center
        $0.lineSpacing = 8.0
    }.rawValue
    
    
    // 3. underLine:  you can set range, default allRange
    label3.attributedText = content.toAttributed.underLine(style: [.styleDouble, .patternDot], color: UIColor.red).rawValue
    
    // 4. font, foregroundColor
    textField.attributedPlaceholder = "Please enter the phone number".toAttributed.font(.systemFont(ofSize: 15))
                                                                     .foregroundColor(.red).rawValue
    
    // 5. Even you can do it
    label6.attributedText = content.toAttributed
                .underLine(style: [.styleSingle, .patternDot], color: .red, range: NSMakeRange(0, 5))
                .font(.systemFont(ofSize: 18), range: NSMakeRange(5, 5))
                .backgroundColor(.blue, range: NSMakeRange(10, 5))
                .foregroundColor(.purple, range: NSMakeRange(15, 5))
                .baselineOffset(value: 5, range: NSMakeRange(20, 5))
                .obliqueness(angle: 0.5, range: NSMakeRange(25, 5))
                .kern(padding: 0.3, range: NSMakeRange(30, 5))
                .expansion(value: 0.3, range: NSMakeRange(35, 5))
                .stroke(color: .green, width: 3, range: NSMakeRange(40, 5))
                .textEffect(range: NSMakeRange(50, 5))
                .shadow{
                    $0.shadowColor = UIColor.red
                    $0.shadowOffset = CGSize(width: 3, height: 3)
                    $0.shadowBlurRadius = 2.0
                }.rawValue
    
    
    wgziOS
        1
    wgziOS  
       2017-06-20 10:51:27 +08:00
    很厉害的样子,还在学 swift,看不懂
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