ios 字符串大小写转换代码

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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
     
NSLog(@"原student:%@",student);
NSLog(@"大写student:%@",studentUp);
NSLog(@"开头大写student:%@",studentUpFirst);
NSLog(@"\n");
NSLog(@"原TEACHER:%@",TEACHER);
NSLog(@"小写TEACHER:%@",TEACHERLower);
NSLog(@"开头大写TEACHER:%@",TEACHERUpFirst);2
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NSString *stu