减去数组，关于字典中的键

Question

假设我有两个数组

NSArray *array1=@[ @{@"key1":@"A",@"key2":@"AA"},@{@"key1":@"C",@"key2":@"CC"},@{@"key1":@"E",@"key2":@"EE"},@{@"key1":@"G",@"key2":@"GG"}];
NSArray *array2=@[ @{@"key1":@"A",@"key2":@"AAA"},@{@"key1":@"Z",@"key2":@"ZZZ"}];

我想减去数组，这应该是预期的结果，

NSArray *resultArray=@[ @{@"key1":@"C",@"key2":@"CC"},@{@"key1":@"E",@"key2":@"EE"},@{@"key1":@"G",@"key2":@"GG"}];

我试过下面的代码但没有用

NSArray *extracted = [array1 valueForKey:@"key1"];
NSMutableSet *pressieContactsSet = [NSMutableSet setWithArray:extracted];
NSMutableSet *allContactSet = [NSMutableSet setWithArray:array2];

[allContactSet minusSet:pressieContactsSet];

NSLog(@"%@",allContactSet);

Answer 1

这应该有效。

NSArray *array1=@[ @{@"key1":@"A"},@{@"key1":@"C"},@{@"key1":@"E"},@{@"key1":@"G"}];
NSArray *array2=@[ @{@"key1":@"A"},@{@"key1":@"Z"}];

NSMutableSet *pressieContactsSet = [NSMutableSet setWithArray:array1];
NSSet *allContactSet = [NSSet setWithArray:array2];

[pressieContactsSet minusSet:allContactSet];

NSArray *result = [pressieContactsSet allObjects];

NSLog(@"%@",result);

Answer 2

尽情享受吧！

NSArray *array1=@[ @{@"key1":@"A"},@{@"key1":@"C"},@{@"key1":@"E"},@{@"key1":@"G"}];
NSArray *array2=@[ @{@"key1":@"A"},@{@"key1":@"Z"}];
NSMutableArray *resultArray = [NSMutableArray arrayWithArray:array1];
[resultArray removeObjectsInArray:array2];
NSLog(@"array %@",resultArray);

Answer 3

请尝试以下代码

首先获取临时数组中的所有key1对象。然后在 array1 上应用过滤器并检查您的 array1 对象是否包含 arrayKey1 对象。

确保它只会检查 key1 键。

NSArray *arrKey1 = [array2 valueForKey:@"key1"];
NSPredicate *pred = [NSPredicate predicateWithBlock:
                            ^BOOL(id evaluatedObject, NSDictionary *bindings)
                            {
                                if ([arrKey1 containsObject:evaluatedObject[@"key1"]])
                                {
                                    NSLog(@"found : %@",evaluatedObject);
                                    return NO;
                                }
                                else
                                {
                                    NSLog(@"Not found : %@",evaluatedObject);
                                    return YES;
                                }

                            }];
NSArray *arrSubtracted = [array1 filteredArrayUsingPredicate:pred];

NSLog(@"%@", arrSubtracted);

或者您可以使用 enumerateObjectsUsingBlock

NSMutableArray *resultArray = [NSMutableArray new];

[array1 enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop)
{
    if (![arrKey1 containsObject:obj[@"key1"]]) {
        [resultArray addObject:obj];
    }
}];
NSLog(@"%@",resultArray);

希望对您有所帮助。

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