从NSMutableArray中收集特定对象的计数

Question

嘿伙计们,我想知道如何在数组中找到特定类型对象的对象数.例如,我在随机位置的NSMutableArray中有6个'云',我在这个NSMutableArray中也有4个'龙'.

我怎样才能收集整数6？

我正在思考以下问题:

int z = [[SomeClass *clouds in _somearray] count];

任何帮助将不胜感激.Thnx,奥利弗.

Answer 1

另一种方法是使用块:

Class cloadClass = NSClassFromString(@"Cloud");
NSArray *a = /* you array with clouds and dragons */;

NSIndexSet *clouds = [a indexesOfObjectsPassingTest: 
    ^(id obj, NSUInteger idx, BOOL *stop) {
        return [obj isKindOfClass:cloadClass];
    }];

// now we can count clouds
NSLog(@"%d", [clouds count]);

// but also we now can return our clouds immediately and
NSLog(@"%@", [a objectsAtIndexes:clouds]);

Answer 2

int result = 0;
for (NSObject *object in _somearray) {
    if ([object isKindOfClass:[SomeClass class]])
        result++;
}

result 是你要找的伯爵