NSString -2位数字

Question

‘嗨，我有一个包含2位数字(如32)的字符串，但我想获取并使用它作为2个单位数(如3和2)。我该怎么做呢？提前谢谢。

  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];

它现在可以使用to数字(即32位)，但如果我尝试只输入一个数字，我会得到一个错误...有什么想法吗？谢谢

Answer 1

循环并从字符串中一次提取一个字符。

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

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

Answer 2

NSString的-characterAtIndex:应该可以做到这一点：

NSString            *firstThird = @"32";
unichar             c1, c2;

c1 = [ firstThird characterAtIndex: 0 ];
c2 = [ firstThird characterAtIndex: 1 ];

switch ( c1 ) {
case '3':
    ...
}

Answer 3

跳过任何unicode复杂性，如何提取字符

unichar firstChar = firstThird characterAtIndex: 0；