ios - 将 NSString 转换为其他 NSString

Question

我有 3 个 NSString 和 1 个带值的 NSArray，我尝试将所有字符串转换为一个:

string01 = [string01 stringByAppendingString:[numbersValue objectAtIndex:Value1 -1]];
string03 = [string02 stringByAppendingString:[numbersValue objectAtIndex:Value2 -1]];
string03 = [string03 stringByAppendingString:[numbersValue objectAtIndex:Value3 -1]];

//here i will to convert value of striing01 in to string02 and string02 in to string03 than take last string in my UITextView

resulteString = [resulteString stringByAppendingString:<what i can write here?>];

[myTextView setText:resulteString];

就像一台谜机，例如，如果你想到键盘并按 A，

A pass inside a string01 and become B,
B pass inside a string02 and become C,
C pass inside string03 and become D
in my text view i need to see only D 

Answer 1

如果 resulteString 是 NSString 类的对象然后使用

resultString = [NSString stringWithFormat:@"%@%@%@%@", resultString,string01, string02, string03];

否则如果 resulteString 是 NSMutableString 类的对象

   resulteString = [resulteString stringByAppendingFormat:@"%@%@%@", string01, string02, string03];

可能对你有帮助。