NSDictionary的NSArray的過濾器和NSDictionary

Question

我有一個NSDictionary，其中包含大約150個鍋爐制造商的鑰匙。 每個鍵的值是NSDictionary的NSArray。 每個NSDictionary代表具有某些屬性的鍋爐：

NSDictionary boilerData =
{
     @"Alpha" = [{name: Boiler1, rating: 80}, {name:Boiler2, rating: 90}],
     @"Beta" = [{name: Boiler3, rating: 80}, {name:Boiler4, rating: 91}, {name:Boiler5, rating: 78}],
     ...
}

我希望能夠進行過濾，以便獲得所有額定值為80的鍋爐。我知道我需要一個NSPredicate，但是我不知道如何構建它？ 我發現沒有其他文章似乎符合此要求。

Answer 1

NSDictionary *boilerData =
@{
  @"Alpha" : @[@{@"name": @"Boiler1", @"rating": @80}, @{@"name": @"Boiler2", @"rating": @90}],
  @"Beta" : @[@{@"name": @"Boiler3", @"rating": @98}, @{@"name": @"Boiler4", @"rating": @80}, @{@"name": @"Boiler5", @"rating": @90}]
  };

NSMutableArray *filteredArray = [[NSMutableArray alloc] init];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"rating = 80"];
for (NSArray *array in [boilerData allValues]) {
    [filteredArray addObjectsFromArray:[array filteredArrayUsingPredicate:predicate]];
}
NSLog(@"all boilers with rating = 80 : %@", filteredArray);