Question

我在NSMutableDictionary检索Key和Value检查时有点混淆，因为我做了这段代码。

    NSMutableDictionary *testDictionary=[NSMutableDictionary dictionary];
        //  NSMutableDictionary *testDictionary=[[NSMutableDictionary alloc]init];

        [testDictionary setObject:@"Muhammed Musthafa" forKey:@"10005"];
        [testDictionary setObject:@"Lubaba p" forKey:@"10006"];
        [testDictionary setObject:@"Sahala Banu" forKey:@"10007"];
        [testDictionary setObject:@"Vishnu k" forKey:@"10008"];
        [testDictionary setObject:@"Shabeer PP" forKey:@"10009"];
        [testDictionary setObject:@"Sabeehath " forKey:@"10010"];
        [testDictionary setObject:@"Anusha GS" forKey:@"10011"];
        [testDictionary setObject:@"JINI KS" forKey:@"10012"];
        [testDictionary setObject:@"Athulya T" forKey:@"10013"];
        [testDictionary setObject:@"Midhun KS" forKey:@"10014"];

        for(NSString *kk in testDictionary)
        {
            NSString *fName;
            if(kk==@"10006")
            {
                fName=[testDictionary objectForKey:kk];

            }
            if(kk==@"10007")
            {
                fName=[testDictionary objectForKey:kk];

            }
            if(kk==@"10013")
            {
                fName=[testDictionary objectForKey:kk];
            }
            NSLog(@"KEY=====%@ and  Value====%@",kk,fName);

        }
The out put value :

    2011-11-17 10:49:37.054 ArchiveData[2539:207] KEY=====10013 and  Value====
    2011-11-17 10:49:37.055 ArchiveData[2539:207] KEY=====10006 and  Value====
    2011-11-17 10:49:37.056 ArchiveData[2539:207] KEY=====10008 and  Value====
    2011-11-17 10:49:37.056 ArchiveData[2539:207] KEY=====10010 and  Value====
    2011-11-17 10:49:37.057 ArchiveData[2539:207] KEY=====10012 and  Value====
    2011-11-17 10:49:37.057 ArchiveData[2539:207] KEY=====10014 and  Value====
    2011-11-17 10:49:37.058 ArchiveData[2539:207] KEY=====10005 and  Value====
    2011-11-17 10:49:37.059 ArchiveData[2539:207] KEY=====10007 and  Value====
    2011-11-17 10:49:37.060 ArchiveData[2539:207] KEY=====10009 and  Value====
    2011-11-17 10:49:37.061 ArchiveData[2539:207] KEY=====10011 and  Value====

为什么这三个{（kk == @“10006”）if（kk == @“10007”）if（kk == @“10013”）} if state return false？
还有其他方法可以像这样检查id键吗？
我看到相同类型的编码在其他编码中运行良好，所以这取决于其他任何配置吗？
如何检查特定键== @“某些键值”？

Answer 1

使用[kk isEqualToString:@"10006"]比较字符串可能会更好，以便进行正确的字符串比较而不是指针比较。

Answer 2

代码：

NSMutableDictionary *testDictionary=[NSMutableDictionary dictionary];
    //  NSMutableDictionary *testDictionary=[[NSMutableDictionary alloc]init];

    [testDictionary setObject:@"Muhammed Musthafa" forKey:@"10005"];
    [testDictionary setObject:@"Lubaba p" forKey:@"10006"];
    [testDictionary setObject:@"Sahala Banu" forKey:@"10007"];
    [testDictionary setObject:@"Vishnu k" forKey:@"10008"];
    [testDictionary setObject:@"Shabeer PP" forKey:@"10009"];
    [testDictionary setObject:@"Sabeehath " forKey:@"10010"];
    [testDictionary setObject:@"Anusha GS" forKey:@"10011"];
    [testDictionary setObject:@"JINI KS" forKey:@"10012"];
    [testDictionary setObject:@"Athulya T" forKey:@"10013"];
    [testDictionary setObject:@"Midhun KS" forKey:@"10014"];

    for(NSString *kk in testDictionary)
    {
        NSString *fName;
        if([kk isEqualToString:@"10006"])
        {
            fName=[testDictionary objectForKey:kk];

        }
        if([kk isEqualToString: @"10007"])
        {
            fName=[testDictionary objectForKey:kk];

        }
        if([kk isEqualToString:@"10013"])
        {
            fName=[testDictionary objectForKey:kk];
        }
        NSLog(@"KEY=====%@ and  Value====%@",kk,fName);

    }

输出您的代码。

2011-11-17 12:47:59.910 test[12512:a0f] KEY=====10008 and  Value====(null)
2011-11-17 12:47:59.910 test[12512:a0f] KEY=====10010 and  Value====(null)
2011-11-17 12:47:59.911 test[12512:a0f] KEY=====10012 and  Value====(null)
2011-11-17 12:47:59.911 test[12512:a0f] KEY=====10014 and  Value====(null)
2011-11-17 12:47:59.912 test[12512:a0f] KEY=====10005 and  Value====(null)
2011-11-17 12:47:59.912 test[12512:a0f] KEY=====10007 and  Value====Sahala Banu
2011-11-17 12:47:59.912 test[12512:a0f] KEY=====10009 and  Value====Sahala Banu
2011-11-17 12:47:59.913 test[12512:a0f] KEY=====10011 and  Value====Sahala Banu
2011-11-17 12:47:59.913 test[12512:a0f] KEY=====10013 and  Value====Athulya T
2011-11-17 12:47:59.913 test[12512:a0f] KEY=====10006 and  Value====Lubaba p

它工作正常。在10007之后，你没有10009和10011的条件。所以fName值没有改变。
使用==运算符时，您正在比较指针值。这仅适用于您要比较的对象在同一内存地址上完全相同的对象。

NSMutableDictionary键值检查问题

2 个答案: