将具有相同键的所有对象从 NSDictionary 添加到 NSArray

发布于 2024-11-05 19:51:43 字数 456 浏览 2 评论 0原文

NSArray *myArray=[[NSUserDefaults standardUserDefaults] objectForKey:@"userInfo"];

    for(NSDictionary *d in myArray){

        newInfo=[d valueForKey:@"screen_name"];

        NSLog(@"%@", newInfo);      

        listOfTerms=[[NSMutableArray alloc]initWithObjects:newInfo, nil];


        NSLog(@"here   %@", listOfTerms);           
    }

上面你可以看到我正在使用的代码，但 listOfTerms 只有一个条目，它似乎是字典中的最后一个对象。我已经尝试解决这个问题几个小时了。任何帮助将不胜感激。

原文

NSArray *myArray=[[NSUserDefaults standardUserDefaults] objectForKey:@"userInfo"];

    for(NSDictionary *d in myArray){

        newInfo=[d valueForKey:@"screen_name"];

        NSLog(@"%@", newInfo);      

        listOfTerms=[[NSMutableArray alloc]initWithObjects:newInfo, nil];


        NSLog(@"here   %@", listOfTerms);           
    }

above you can see the code i'm using, but listOfTerms only ever has one entry which seems to be the last object in the dictionary. i've been trying to sort this out for some hours now. any help would be appreciated.

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流云如水 2024-11-12 19:51:43

使用键值编码，整个代码可以替换为：

NSArray *myArray=[[NSUserDefaults standardUserDefaults] objectForKey:@"userInfo"];
NSArray *listOfTerms = [myArray valueForKey:@"screen_name"];

了解框架，利用它来发挥你的优势。

Using Key-Value Coding, that whole code can be replaced by:

NSArray *myArray=[[NSUserDefaults standardUserDefaults] objectForKey:@"userInfo"];
NSArray *listOfTerms = [myArray valueForKey:@"screen_name"];

Know the framework, use it for your advantage.

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蓝戈者 2024-11-12 19:51:43

您在每次迭代中都会覆盖 listOfTerms，请尝试以下操作：

listOfTerms = [[NSMutableArray alloc] init];

NSArray *myArray=[[NSUserDefaults standardUserDefaults] objectForKey:@"userInfo"];

for(NSDictionary *d in myArray){

    newInfo=[d valueForKey:@"screen_name"];

    NSLog(@"%@", newInfo);      

    [listOfTerms addObject:newInfo];

    NSLog(@"here   %@", listOfTerms);           
}

You are overwriting listOfTerms in every iteration, try this instead:

listOfTerms = [[NSMutableArray alloc] init];

NSArray *myArray=[[NSUserDefaults standardUserDefaults] objectForKey:@"userInfo"];

for(NSDictionary *d in myArray){

    newInfo=[d valueForKey:@"screen_name"];

    NSLog(@"%@", newInfo);      

    [listOfTerms addObject:newInfo];

    NSLog(@"here   %@", listOfTerms);           
}

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