label调整字间距，调整行间距

number = 1.0f

​​//调整字间距​​

​​CFNumberRef​​​ ​​num = CFNumberCreate(kCFAllocatorDefault,kCFNumberSInt​​​​8​​​​Type,&number;);​​


​​[attributedString​​​ ​​addAttribute​​​​:(​​​​id​​​​)kCTKernAttributeName​​​ ​​value​​​​:(__bridge ​​​​id​​​​)num​​​ ​​range​​​​:NSMakeRange(​​​​0​​​​, [attributedString​​​ ​​length​​​​])];​​


​​//调整行间距​​


​​[attributedString​​​ ​​addAttribute​​​​:​​​​NSParagraphStyleAttributeName​​​ ​​value​​​​:paragraphStyle​​​ ​​range​​​​:NSMakeRange(​​​​0​​​​, [_messageLabel​​​​.text​​​ ​​length​​​​])];​​

​​_messageLabel​​​​.attributedText​​​ ​​= attributedString;​​