CoreText --->NSAttributedStri

2018-01-24 本文已影响254人张芳涛

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:

属性名称	意义
font	字体
paragraphStyle	段落设置，默认是：defaultParagraphStyle
foregroundColor	文字颜色，默认是黑色的
backgroundColor	背景颜色，默认是没有背景颜色
ligature	网上说是连字功能，默认是关闭的，我试了一下，没啥用，可能没有看到可以连字的字母吧
kern	字符间距，0表示字符间距不可用
strikethroughStyle	删除线的类型，只有0(无删除线)1(有删除线)两种样式
underlineStyle	下划线样式0(没有下划线),1(有下划线)
strokeColor	文字的描边颜色，默认是没有描边颜色，也就是背景颜色
strokeWidth	文字的描边宽度，默认是0，没有描边
shadow	阴影，默认是没有阴影的
textEffect	文字效果，默认没有文字效果
attachment	附件
link	链接
baselineOffset	基线的偏移量
underlineColor	下划线颜色，默认是nil，背景颜色
strikethroughColor	删除线颜色，默认是nil，背景颜色
obliqueness	字体倾斜度，默认是没有倾斜度
expansion	字体的伸缩，小于零是缩小，大于零是扩张
writingDirection	字体的方向，有LRE, RLE, LRO, 和RLO几种模式，现在还不知道怎么赋值。。。。。( ˇˍˇ )
verticalGlyphForm	文字的排版方向

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🙃。