我无法删除NSArray iPhone中的重复对象 [英] i cannot remove duplicate objects in a NSArray iphone

问题描述

我现在要疯了。我有一个带有一堆Person对象的NSMutableArray。我想删除重复的对象，但无法使用。这就是我得到的：

I'm going crazy right now. I have a NSMutableArray with a bunch of Person objects. I want to remove the duplicated objects but it won't work. This is what i got:

NSMutableArray *withoutDoubles =[[NSMutableArray alloc]init];
    NSArray *temp = [[NSArray alloc] initWithArray:tempResults];
    for (Person *person in temp) {
        if(![withoutDoubles containsObject:person]) {
            [withoutDoubles addObject:person];
        }       
    }
    for (Person *person in withoutDoubles) {
         NSLog(@"----> %@",person.name);
    }

那是行不通的，我仍然重复。我也尝试过：

That is not working, i still got duplicates. I also tried:

NSArray *temp = [[NSArray alloc] initWithArray:tempResults];
NSSet *set = [NSSet setWithArray:temp];

但它也不起作用。我需要一些帮助。

But it didn't work either. I need some help here.

预先感谢。

推荐答案

如果您定义重复项是两个单独的Person对象，它们的属性设置相同，那么实现此目的的最佳方法是在您的Person对象中覆盖这两个方法

If your definition of a duplicate is two separate Person objects whose properties are set the same then the best way to achieve this is to override these two methods in your Person object

- (BOOL)isEqual:(id)anObject
- (NSUInteger)hash

然后您需要执行以下操作

You would then need to do the following

for (Person *personToTest in temp) {
    BOOL duplicate = NO;
    for (Person *person in withoutDoubles) {
        if ([personToTest isEqual:person]) {
            duplicate = YES;
            break;
        }
    }
    if (!duplicate) {
        [withoutDoubles addObject:personToTest];
    }      
}

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