iphone - NSString-2位数字

Question

嗨，
我有一个带有2位数字的字符串(如32)，但我想获取并使用它作为2位数字(例如3和2)。我该怎么做？提前致谢。

  NSString *depositOverTotalRwy = [NSString stringWithFormat:@"%@", [deposit text]];
NSArray *components = [depositOverTotalRwy
                       componentsSeparatedByString:@"/"];
NSString *firstThird = [components objectAtIndex:0];
unichar firstChar = [firstThird characterAtIndex: 0];
NSString *firstCharStr = [NSString stringWithFormat:@"%c", firstChar];

unichar secChar = [firstThird characterAtIndex: 1];
NSString *secCharStr = [NSString stringWithFormat:@"%c",secChar];






NSLog(@"%@ over %@", firstCharStr, secCharStr);

if ([firstCharStr  isEqualToString: @"1"]) {
    firstCharStr=@"wet";
    NSLog(@"wet");
}
if ([firstCharStr  isEqualToString: @"2"]) {
    firstCharStr=@"snow";

    NSLog(@"snow");
}
if ([firstCharStr  isEqualToString: @"3"]) {
    firstCharStr=@"ice";
    NSLog(@"ice");
    }

if ([secCharStr  isEqualToString: @"1"]) {
    secCharStr=@"wet";
    NSLog(@"wet");
}
if ([secCharStr  isEqualToString: @"2"]) {
    secCharStr=@"snow";

    NSLog(@"snow");
}
if ([secCharStr  isEqualToString: @"3"]) {
    secCharStr=@"ice";
    NSLog(@"ice");
}

NSString *secThird = [components objectAtIndex:1];
if ([secThird isEqualToString: @"1"]) {
    secThird = @"wet";
    NSLog(@"wet");
}
if ([secThird isEqualToString:@"2"]) {
    secThird = @"snow";

    NSLog(@"snow");
}
if ([secThird isEqualToString:@"3"]) {
    secThird = @"ice";

    NSLog(@"ice");
}

NSString *thirdThird = [components objectAtIndex:2];

if ([thirdThird isEqualToString: @"1"]) {
    thirdThird = @"wet";
    NSLog(@"wet");
}
if ([thirdThird isEqualToString:@"2"]) {
    thirdThird = @"snow";

    NSLog(@"snow");
}
if ([thirdThird isEqualToString:@"3"]) {
    thirdThird = @"ice";

    NSLog(@"ice");
}

dep.text = [NSString stringWithFormat:@"1/3 %@%@ 2/3 %@ 3/3 %@", firstCharStr,secCharStr, secThird, thirdThird];

它现在可以与数字(即32)一起使用，但是如果我尝试只输入一个数字，我会得到一个错误....知道吗？谢谢

Answer 1

循环遍历并一次从字符串中提取一个字符。

for(int i = 0; i < [myString length]; i++)
{
      char extractedChar = [myString characterAtIndex:i];

      if(extractedChar == '1')....
}