最近整理了一下CoreText里面的相关知识点，现在刚看到NSAttributedString，也从网上查到了一些资料，不过总感觉有很多文章只是对于Apple Document的翻译，对于初学者来说，可能更想要知道落实到代码是什么？每一个属性又是做什么的。废话不多少，发车了！

一：源代码

github地址：NSAttributedString。喜欢的麻烦给颗星🙃

二：属性列表

NSAttributedString属性列表如下:

三：效果示意图和代码实现

再说一遍，先把上面的demo下载下来：NSAttributedString，下面的代码都在demo的代码里面

3.1：font

字体设定

具体实现代码如下：

 //代码位置：BoldSystemFontViewController.swift
  func refreshLabel(font:UIFont){
    let dict = [NSAttributedStringKey.font:font]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.2：paragraphStyle

paragraphStyle

//代码位置：ParagraphStyleViewController.swift
func refreshLabel(index:Int){
    let style = NSMutableParagraphStyle.init()
    switch index {
    case 0:
        style.lineSpacing = 20.0
        break
    case 1:
        style.paragraphSpacing = 20.0
        break
    case 2:
        style.alignment = .right
        break
    case 3:
        style.firstLineHeadIndent = 20.0
        break
    case 4:
        style.headIndent = 20.0
        break
    case 5:
        style.tailIndent = 20.0
        break
    case 6:
        style.lineBreakMode = .byWordWrapping
        break
    case 7:
        style.minimumLineHeight = 10
        break
    case 8:
        style.maximumLineHeight = 20
        break
    case 9:
        style.baseWritingDirection = .rightToLeft
        break
    case 10:
        style.lineHeightMultiple = 3.0
        break
    case 11:
        style.paragraphSpacingBefore = 20.0
        break
    case 12:
        style.hyphenationFactor = 20.0
        break
    case 13:
        let decimalTab = NSTextTab.init(textAlignment: .right, location: 5, options: [:])
        let percentTab = NSTextTab.init(textAlignment: .left, location: 20, options: [:])
        style.tabStops = [decimalTab,percentTab]
        break
    case 14:
        style.defaultTabInterval = .infinity*2
        break
    case 15:
        style.allowsDefaultTighteningForTruncation = true
        break
    case 16:
        let decimalTab = NSTextTab.init(textAlignment: .right, location: 5, options: [:])
        style.addTabStop(decimalTab)
        break
    case 17:
        let decimalTab = NSTextTab.init(textAlignment: .right, location: 5, options: [:])
        style.removeTabStop(decimalTab)
        break
    case 18:
        let newStyle = NSMutableParagraphStyle.init()
        newStyle.lineSpacing = 30
        style.setParagraphStyle(newStyle)
        break
    default:
        break
    }
    let dict = [NSAttributedStringKey.paragraphStyle:style]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.3：ForeGroundColor

ForeGroundColor

//代码位置：ForegroundColorViewController.swift
func refreshLabel(color:UIColor){
    let dict = 
[NSAttributedStringKey.foregroundColor:color]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.4：backgroundColor

backgroundColor

//BackgroundColorViewController.swift
func refreshLabel(color:UIColor){
    let dict = [NSAttributedStringKey.backgroundColor:color]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.5:ligature

ligature

//代码位置：LigatureViewController.swift
func refreshLabel(index:Int){
    let dict = [NSAttributedStringKey.ligature:index]
    
    let attrStr = NSMutableAttributedString.init(string: self.titleStr + pinyin, attributes: dict)
    label.attributedText = attrStr
}

3.6：kern

kern

//KernViewController.swift
func refreshLabel(index:Int){
    let dict = [NSAttributedStringKey.kern:index]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.7:strikethroughStyle

strikethroughStyle

//代码位置：StrikethroughStyleViewController.swift
func refreshLabel(index:Int){
    let dict = [NSAttributedStringKey.strikethroughStyle:index]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.8：UnderlineStyle

UnderlineStyle

//UnderlineStyleViewController.swift
func refreshLabel(index:Int){
    let dict = [NSAttributedStringKey.underlineStyle:index]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.9:StrokeColor

StrokeColor

//代码位置：StrokeColorViewController.swift
func refreshLabel(color:UIColor){
    let dict = [NSAttributedStringKey.strokeColor:color,NSAttributedStringKey.strokeWidth:1] as [NSAttributedStringKey : Any]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.10：StrokeWidth

StrokeWidth

//代码位置：StrokeWidthViewController.swift
func refreshLabel(width:CGFloat){
    let dict = [NSAttributedStringKey.strokeColor:UIColor.red,NSAttributedStringKey.strokeWidth:width] as [NSAttributedStringKey : Any]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.11：shadow

shadow

//代码位置：ShadowViewController.swift
 func refreshLabel(){
    let red = CGFloat(arc4random_uniform(255))/CGFloat(255.0)
    let green = CGFloat( arc4random_uniform(255))/CGFloat(255.0)
    let blue = CGFloat(arc4random_uniform(255))/CGFloat(255.0)
    let alpha = CGFloat(arc4random_uniform(255))/CGFloat(255.0)
    let color = UIColor.init(red:red, green:green, blue:blue , alpha: alpha)
    let shadowBlurRadius = arc4random_uniform(5)
    let offsetX = arc4random_uniform(2)
    let offsetY = arc4random_uniform(5)
    let shadow = NSShadow.init()
    shadow.shadowOffset = CGSize(width: CGFloat(offsetX), height:CGFloat(offsetY))
    shadow.shadowBlurRadius = CGFloat(shadowBlurRadius)
    shadow.shadowColor = color
    let dict = [NSAttributedStringKey.shadow:shadow]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.12：textEffect

textEffect

感觉这个操作有点卡。。。等有时间了看看咋回事

//代码位置:TextEffectViewController.swift
func refreshLabel(){
    let dict = [NSAttributedStringKey.textEffect:NSAttributedString.TextEffectStyle.letterpressStyle]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.13:Attachment

Attachment

//代码位置：AttachmentViewController.swift
func refreshLabel(index:Int){
    let attach = NSTextAttachment.init()
    switch index {
    case 0:
        attach.contents = Data.init(base64Encoded: "zhangfangtao", options: .ignoreUnknownCharacters)
        break
    case 1:
        attach.fileType = "txt"
        break
    case 2:
        attach.image = UIImage.init(named: "icon")
        break
    case 3:
        attach.bounds = CGRect(x: 0, y: 0, width: 50, height: 50)
        break
    case 4:
        let filewrapper = FileWrapper.init(symbolicLinkWithDestinationURL: URL.init(string: "www.baidu.com")!)
        attach.fileWrapper = filewrapper
    default:
        break
    }
    
    attach.bounds = CGRect(x: 0, y: 0, width: 50, height: 50)
    let imageStr = NSAttributedString.init(attachment: attach)
    let attrStr = NSMutableAttributedString.init(string: self.titleStr)
    attrStr.insert(imageStr, at: 6)
    label.attributedText = attrStr
}

3.14：Link

Link

//代码位置：LinkViewController.swift
 func refreshLabel(){
    let dict = [NSAttributedStringKey.link:URL.init(string: "www.baidu.com")]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.15：BaselineOffset

BaselineOffset

//代码位置：BaselineOffsetViewController.swift
func refreshLabel(index:Int){
    let dict = [NSAttributedStringKey.baselineOffset:self.offsetArray[index]]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.16：UnderlineColor

UnderlineColor

//代码位置：UnderlineColorViewController.swift
func refreshLabel(color:UIColor){
    let dict = [NSAttributedStringKey.underlineStyle:1,NSAttributedStringKey.underlineColor:color] as [NSAttributedStringKey : Any]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.17：StrikethroughColor

StrikethroughColor

//代码位置：StrikethroughColorViewController.swift
func refreshLabel(color:UIColor){
    let dict = [NSAttributedStringKey.strikethroughStyle:1,NSAttributedStringKey.strikethroughColor:color] as [NSAttributedStringKey : Any]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.18：ObliquenessView

ObliquenessView

//代码位置：ObliquenessViewController.swift
func refreshLabel(index:Float){
    let dict = [NSAttributedStringKey.obliqueness:index]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.19：ExpansionView

ExpansionView

//代码位置：ExpansionViewController.swift
func refreshLabel(index:Float){
    let dict = [NSAttributedStringKey.expansion:index]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.20：WritingDirectionView

WritingDirectionView

这个还有些小问题，近期也没时间找答案了，怎么赋值？麻烦知道的人留言告诉一下呗。

//代码位置：WritingDirectionViewController.swift
 func refreshLabel(index:NSNumber){
let alertController = UIAlertController.init(title: "这个我目前还不知道怎么设置", message: "正在查询相关的资料", preferredStyle: .alert)
    let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.cancel, handler: nil)
    let okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.default, handler: nil)
    alertController.addAction(cancelAction)
    alertController.addAction(okAction)
    self.present(alertController, animated: true, completion: nil)
    return
    
    let dict = [NSAttributedStringKey.writingDirection:index]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

3.21：VerticalGlyphForm

VerticalGlyphForm

 //代码位置：VerticalGlyphFormViewController.swift
func refreshLabel(index:Float){
    let dict = [NSAttributedStringKey.verticalGlyphForm:index]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

写在最后

时间有限，很多细节还没有接触到，如果有入门想了解的可以看看。源代码github地址：NSAttributedString。喜欢的麻烦给颗星🙃。