label调整字间距，调整行间距

number = 1.0f

 

//调整字间距

    CFNumberRef num = CFNumberCreate(kCFAllocatorDefault,kCFNumberSInt8Type,&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;