CoreText --->NSAttributedString入門教程

最近整理了一下CoreText里面的相關(guān)知識點(diǎn)，現(xiàn)在剛看到NSAttributedString，也從網(wǎng)上查到了一些資料，不過總感覺有很多文章只是對于Apple Document的翻譯，對于初學(xué)者來說，可能更想要知道落實(shí)到代碼是什么？每一個屬性又是做什么的。廢話不多少，發(fā)車了！

一：源代碼

github地址：NSAttributedString。喜歡的麻煩給顆星??

二：屬性列表

NSAttributedString屬性列表如下:

屬性名稱 意義
font 字體
paragraphStyle 段落設(shè)置，默認(rèn)是：defaultParagraphStyle
foregroundColor 文字顏色，默認(rèn)是黑色的
backgroundColor 背景顏色，默認(rèn)是沒有背景顏色
ligature 網(wǎng)上說是連字功能，默認(rèn)是關(guān)閉的，我試了一下，沒啥用，可能沒有看到可以連字的字母吧
kern 字符間距，0表示字符間距不可用
strikethroughStyle 刪除線的類型，只有0(無刪除線)1(有刪除線)兩種樣式
underlineStyle 下劃線樣式0(沒有下劃線),1(有下劃線)
strokeColor 文字的描邊顏色，默認(rèn)是沒有描邊顏色，也就是背景顏色
strokeWidth 文字的描邊寬度，默認(rèn)是0，沒有描邊
shadow 陰影，默認(rèn)是沒有陰影的
textEffect 文字效果，默認(rèn)沒有文字效果
attachment 附件
link 鏈接
baselineOffset 基線的偏移量
underlineColor 下劃線顏色，默認(rèn)是nil，背景顏色
strikethroughColor 刪除線顏色，默認(rèn)是nil，背景顏色
obliqueness 字體傾斜度，默認(rèn)是沒有傾斜度
expansion 字體的伸縮，小于零是縮小，大于零是擴(kuò)張
writingDirection 字體的方向，有LRE, RLE, LRO, 和RLO幾種模式，現(xiàn)在還不知道怎么賦值。。。。。( ˇ?ˇ )
verticalGlyphForm 文字的排版方向

三：效果示意圖和代碼實(shí)現(xiàn)

再說一遍，先把上面的demo下載下來：NSAttributedString，下面的代碼都在demo的代碼里面

3.1：font

字體設(shè)定

具體實(shí)現(xiàn)代碼如下：

 //代碼位置：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
//代碼位置：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
//代碼位置：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
//代碼位置：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
//代碼位置：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
//代碼位置：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
//代碼位置：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
//代碼位置：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

感覺這個操作有點(diǎn)卡。。。等有時間了看看咋回事

//代碼位置: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
//代碼位置：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
//代碼位置：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
//代碼位置：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
//代碼位置：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
//代碼位置：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
//代碼位置：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
//代碼位置：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

這個還有些小問題，近期也沒時間找答案了，怎么賦值？麻煩知道的人留言告訴一下唄。

//代碼位置：WritingDirectionViewController.swift
 func refreshLabel(index:NSNumber){
let alertController = UIAlertController.init(title: "這個我目前還不知道怎么設(shè)置", message: "正在查詢相關(guān)的資料", 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
 //代碼位置：VerticalGlyphFormViewController.swift
func refreshLabel(index:Float){
    let dict = [NSAttributedStringKey.verticalGlyphForm:index]
    let attrStr = NSMutableAttributedString.init(string: self.titleStr, attributes: dict)
    label.attributedText = attrStr
}

寫在最后

時間有限，很多細(xì)節(jié)還沒有接觸到，如果有入門想了解的可以看看。源代碼github地址：NSAttributedString。喜歡的麻煩給顆星??。

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