#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];
??????? }