1.話不多說(shuō)，直接上代碼

        let label = UILabel(frame: view.bounds)
        label.textAlignment = .center
        view.addSubview(label)
        
        let myString = "Swift"
        //設(shè)置文字顏色成藍(lán)色，屬性文本別的設(shè)置也幾乎就是在這個(gè)字典中設(shè)置
        let myAttribute = [NSForegroundColorAttributeName: UIColor.blue]
        let myAttrString = NSAttributedString(string: myString, attributes: myAttribute)
        label.attributedText = myAttrString

生成效果：

屏幕快照 2017-05-05 下午2.31.57.png

2.設(shè)置文本屬性

從上面代碼看出，設(shè)置文本的屬性，是通過(guò)myAttribute這個(gè)字典來(lái)實(shí)現(xiàn)的。所以下面一一列舉一些常用的設(shè)置：

1.設(shè)置背景顏色

//設(shè)置成黃色
let myAttribute = [NSBackgroundColorAttributeName: UIColor.yellow]

屏幕快照 2017-05-05 下午2.35.04.png

2.設(shè)置字體和字體大小

let myAttribute = [NSFontAttributeName: UIFont(name: "Chalkduster", size: 18.0)]

屏幕快照 2017-05-05 下午2.39.20.png

3.設(shè)置下劃線

let myAttribute = [ NSUnderlineStyleAttributeName: NSUnderlineStyle.StyleSingle.rawValue ]

屏幕快照 2017-05-05 下午2.40.24.png

4.設(shè)置陰影

let myShadow = NSShadow()
myShadow.shadowBlurRadius = 3
myShadow.shadowOffset = CGSize(width: 3, height: 3)
myShadow.shadowColor = UIColor.gray

let myAttribute = [ NSShadowAttributeName: myShadow ]

屏幕快照 2017-05-05 下午2.40.46.png

3.Attributes創(chuàng)建

文本的屬性可以單獨(dú)一個(gè)一個(gè)的創(chuàng)建，如下：

let singleAttribute1 = [ NSForegroundColorAttributeName: UIColor.green ]
let singleAttribute2 = [ NSBackgroundColorAttributeName: UIColor.yellow ]
let singleAttribute3 = [ NSUnderlineStyleAttributeName: NSUnderlineStyle.styleDouble.rawValue ]

也可以一次創(chuàng)建多個(gè)屬性，因?yàn)閍ttributes是一個(gè)字典

let multipleAttributes: [String : Any] = [
    NSForegroundColorAttributeName: UIColor.green,
    NSBackgroundColorAttributeName: UIColor.yellow,
    NSUnderlineStyleAttributeName: NSUnderlineStyle.styleDouble.rawValue ]

同時(shí)，也可以自定義屬性上去

let customAttribute = [ "MyCustomAttributeName": "Some value" ]

或者創(chuàng)建出一個(gè)屬性字典，然后依次添加key-value進(jìn)去

var multipleAttributes = [String : Any]()
multipleAttributes[NSForegroundColorAttributeName] = UIColor.green
multipleAttributes[NSBackgroundColorAttributeName] = UIColor.yellow
multipleAttributes[NSUnderlineStyleAttributeName] = NSUnderlineStyle.styleDouble.rawValue

4.創(chuàng)屬性字符串

1.通過(guò)string創(chuàng)建

let attrString1 = NSAttributedString(string: "Hello.")

2.通過(guò)string創(chuàng)建，同時(shí)附加自定義屬性

let attrString2 = NSAttributedString(string: "Hello.", attributes: ["MyCustomAttribute": "A value"])

3.通過(guò)string和特定的屬性創(chuàng)建

let myAttributes1 = [ NSForegroundColorAttributeName: UIColor.green ]
let attrString3 = NSAttributedString(string: "Hello.", attributes: myAttributes1)

4.如果需要改變屬性或者改變內(nèi)容，則可以創(chuàng)建出可變的屬性字符串

let mutableAttrString1 = NSMutableAttributedString()

5.可變屬性文本使用

首先，創(chuàng)建出可變屬性文本

let myString = "Swift"
        //設(shè)置文字顏色成藍(lán)色，富文本別的設(shè)置也幾乎就是在這個(gè)字典中設(shè)置
        let myAttribute = [ NSForegroundColorAttributeName: UIColor.red ]
        let myAttrString = NSMutableAttributedString(string: myString, attributes: myAttribute)
        label.attributedText = myAttrString

如圖：

屏幕快照 2017-05-05 下午2.59.28.png

然后給屬性文本添加新的樣式的屬性文本

let afterString = NSAttributedString(string: "是Apple力推的語(yǔ)言！")
        myAttrString.append(afterString)
        
        label.attributedText = myAttrString

屏幕快照 2017-05-05 下午3.02.11.png

然后給指定區(qū)間的字符串設(shè)定特定的屬性

        let myRange = NSRange(location: 6, length: 5)
        myAttrString.addAttribute(NSForegroundColorAttributeName, value: UIColor.green, range: myRange)
        
        label.attributedText = myAttrString

屏幕快照 2017-05-05 下午3.05.55.png

可以在已有的屬性基礎(chǔ)上再次添加屬性

        let range = NSRange(location: 0, length: myAttrString.length)
        myAttrString.addAttribute(NSBackgroundColorAttributeName, value: UIColor.yellow, range: range)
        
        label.attributedText = myAttrString

屏幕快照 2017-05-05 下午3.08.53.png

5.添加圖片

使用

        let attachment = NSTextAttachment(data: nil, ofType: nil)
        attachment.image = UIImage(named: "image.png")
        attachment.bounds = CGRect(x: 0, y: 0, width: 20, height: 20)
        let image_text = NSAttributedString(attachment: attachment)
        myAttrString.append(image_text)

6.Swift4的改變

在Swift4下，NSFontAttributeName等等，已經(jīng)被統(tǒng)一成NSAttributedStringKey結(jié)構(gòu)體的類屬性中去了,所以，應(yīng)該寫成NSAttributedStringKey.font。

[NSAttributedStringKey.underlineStyle: NSUnderlineStyle.styleSingle.rawValue]