label調整字間距，調整行間距

​​//調整字間距​​

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


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


​​//調整行間距​​


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

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