iOS字符串大小写转换

NSString*student           = @"student";

NSString*studentUp         = [student uppercaseString];    //大写

NSString*studentUpFirst    = [student capitalizedString];  //开头大写，其余小写

     

NSString*TEACHER           = @"TEACHER";

NSString*TEACHERLower      = [TEACHER lowercaseString];    //小写

NSString*TEACHERUpFirst    = [TEACHER capitalizedString];  //开头大写，其余小写