UILabel只是用来现实文字，但是我们经常会遇到文字现实大小与Label大小不适应的问题，这个时候需要考虑换行了

我们直接看代码

        let label1=UILabel(frame: CGRectMake(30,50,310,55))
        label1.text="this determines the number of lines to draw and what to do when sizeToFit.Word Word Word."
        label1.backgroundColor=UIColor.grayColor()
        label1.numberOfLines=0
        label1.lineBreakMode = NSLineBreakMode.ByWordWrapping//按照单词分割换行，保证换行时的单词完整。
        self.view .addSubview(label1)
        
        let label2=UILabel(frame: CGRectMake(30,110,55))
        label2.text="this determines the number of lines to draw and what to do when sizeToFit."
        label2.backgroundColor=UIColor.grayColor()
        label2.numberOfLines=0
        label2.lineBreakMode = NSLineBreakMode.ByCharWrapping//按照字母换行，可能会在换行时将某个单词拆分到两行
        self.view .addSubview(label2)
        
        let label4=UILabel(frame: CGRectMake(30,170,55))
        label4.text="this determines the number of lines to draw and what to do when sizeToFit.Word Word Word."
        label4.backgroundColor=UIColor.grayColor()
        label4.numberOfLines=0
        label4.lineBreakMode = NSLineBreakMode.ByClipping//按照单词换行，但是如果文字最后一行超过Label大小将直接超过边间现实不全
        self.view .addSubview(label4)
        
        let label5=UILabel(frame: CGRectMake(30,230,55))
        label5.text="this determines the number of lines to draw and what to do when sizeToFit.Word Word Word."
        label5.backgroundColor=UIColor.grayColor()
        label5.numberOfLines=0
        label5.lineBreakMode = NSLineBreakMode.ByTruncatingHead//最后一行如果显示不全则在最后一行开始使用...
        self.view .addSubview(label5)
        
        let label6=UILabel(frame: CGRectMake(30,290,55))
        label6.text="this determines the number of lines to draw and what to do when sizeToFit.Word Word Word."
        label6.backgroundColor=UIColor.grayColor()
        label6.numberOfLines=0
        label6.lineBreakMode = NSLineBreakMode.ByTruncatingMiddle//最后一行如果显示不全则在最后一行中间使用...
        self.view .addSubview(label6)
        
        let label7=UILabel(frame: CGRectMake(30,350,55))
        label7.text="this determines the number of lines to draw and what to do when sizeToFit.Word Word Word."
        label7.backgroundColor=UIColor.grayColor()
        label7.numberOfLines=0
        label7.lineBreakMode = NSLineBreakMode.ByTruncatingTail//最后一行如果显示不全则在最后一行末尾使用...
        self.view .addSubview(label7)

NSLineBreakMode

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