给字体加粗

#define IOS_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]

 if(IOS_VERSION >= 8.0)
        {
            lbl_title.font = [UIFont systemFontOfSize:14 weight:1];
        }
        else
        {
            lbl_title.font = [UIFont systemFontOfSize:14];
        }

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给字体加粗

原文：http://9217856.blog.51cto.com/9207856/1738161