计算label

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func getCGSize(size:CGSize,fontSize:CGFloat,text:String)->CGSize{

    let attributes = [NSFontAttributeName:UIFont.systemFontOfSize(fontSize)]

    let option = NSStringDrawingOptions.UsesLineFragmentOrigin

    let sizeMake = text.boundingRectWithSize(size, options: option, attributes: attributes, context: nil).size

    return sizeMake

}

func labelSize(x:CGFloat,y:CGFloat,text:String,attribute :AnyObject) -> CGRect{

    var size = CGRect(origin: CGPoint(x:x,y:y), size: CGSize(width: SCREEN_WIDTH, height: SCREEN_HEIGHT))

    var size2 = CGSize(width: SCREEN_WIDTH, height: 10000);//设置label的最大宽度

    size = text.boundingRectWithSize(size2, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: attribute  as! [String : AnyObject] , context: nil)

    return size

}

计算label

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原文地址：http://www.cnblogs.com/LusYoHo/p/5511341.html