比较objective-C中的2个字符串 [英] Compare 2 strings in objective-C

问题描述

我写了以下代码：

   if (depSelectedIndice > -1 && comSelectedIndice> -1)
        {
            NSLog(@"depart elemet : %d ",depSelectedIndice);
            NSLog(@"depart elemet : %d ",comSelectedIndice);
            NSLog(@"ok1");
            NSString *choosedDate =[NSString stringWithFormat:@"%@%@",[deparatureDates objectAtIndex:depSelecif (depSelectedIndice > -1 && comSelectedIndice> -1)
    {
        NSLog(@"depart elemet : %d ",depSelectedIndice);
        NSLog(@"depart elemet : %d ",comSelectedIndice);
        NSLog(@"ok1");
        NSString *choosedDate =[NSString stringWithFormat:@"%@%@",[deparatureDates objectAtIndex:depSelectedIndice], [goingBackDates objectAtIndex:comSelectedIndice]];
        NSLog(@"0000000000001");

        NSLog(@" number of element : %d", [allCombinations count]);
//        for (int j=0; j<[allCombinations count]; j++)
//        {
//            NSLog(@"111111111111111111");
//           // NSString *date = [[allCombinations objectAtIndex:j] objectForKey:@"keydate"];
//            NSLog(@"22222222222222222222");
//              if([date isEqualToString:choosedDate])
//              {
//                  depPrice.text=@"1";
//                  comPrice.text=@"1";
//                  price.text=@"3";
//                  
//              }
       // }
    }

$ b b

allCombinations是在.h中声明的NSArray，我有initilase并在另一个方法中使用它。我不能在这个方法中使用？ ：/

allCombinations is an NSArray declared in .h , I have initilase and use it in another method . I can't use in in this method ? :/

但我有一个crach。我真的不知道在哪里的问题，但我认为这是我比较if（date == choosedDate）？帮助请

But i have a crach . I don't really know where is the problem but i think it's when i compare if(date==choosedDate) ? Help please

推荐答案

当您在指针上使用 == code> NSString * 它是比较内存地址，不比较字符串的值。

When you use an == on pointers like NSString * it is comparing memory addresses, not comparing the value of strings.

下面将实际比较字符串值：

The following will actually compare the string values:

if([date isEqualToString:choosedDate])

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