ios - 枚举按钮的 NSMutableArray 添加一些到另一个 NSMutableArray

Question

这看起来很简单，但我只是得到一个空数组。

我想获取一个按下的按钮，找到它旁边的所有按钮(参见代码中的注释)，并将所有找到的按钮添加到另一个 NSMutableArray。

然后我想遍历该数组并对每个按钮执行一些操作。

在下面，我使用 [caualtiesArray addObject: btn]; 将找到的按钮存储在数组中，但它似乎并没有这样做，我也不知道为什么。

-(void)detonateBomb:(UIButton*)bombDetonated{
    //stop the spiketimers first
    [spikeTimer invalidate];
    [removeSpikeTimer invalidate];
    //move bomb button (non enabled and hidden) over the pressed button
    //really we are just going to use its rect to find buttons next
    //to the bomb since its rect is lage enough to overlap the others
    bombRadius.center=bombDetonated.center;
    //create an array to hold any matches
    //we cant use the original arrary
    //because the array would be mutated while
    //its being enumerated
    NSMutableArray *caualtiesArray;
        //I did try moving this to declare caualtiesArray
        //in the .h....which didnt fix the issue
    //loop through all of the unpopped buttons
    //if any intersect with "bombRadius" they are next to the bomb
    //add them to the array
    for(UIButton *btn in mutableBubbleArray){
        if (CGRectIntersectsRect(btn.frame, bombRadius.frame)) {
            [caualtiesArray addObject: btn];
            //^^This seems to be the problem
            NSLog(@"------- added button: %ld", (long)[btn tag]);
            NSLog(@"------- foundButtons: %ld", (long)[caualtiesArray count]);
            NSLog(@"*******");
        }
    }
    //now that we have them all
    //pop them and add an extra 50 pts each
    //lets see how many we have first though
    NSLog(@"------- foundButtons: %ld", (long)[caualtiesArray count]);
    for(UIButton *foundBtn in caualtiesArray){
            score+=50;
            [self popBubble:foundBtn];
        NSLog(@"------- popping button: %ld", (long)[foundBtn tag]);
        NSLog(@"*******--------------------");
    }
    //add an extra 100 pts
    score+=100;
    //move the bomb back off-screen
    bombRadius.center=CGPointMake(-100, -100);
    //clean the array
    [caualtiesArray removeAllObjects];
}

这是我在控制台中得到的:

2014-01-15 00:25:39.331 TestApp[7324:60b] ------- (pop method)POPPED A BOMB
2014-01-15 00:25:39.333 TestApp[7324:60b] *********************************
2014-01-15 00:25:39.335 TestApp[7324:60b] ------- added button: 28
2014-01-15 00:25:39.337 TestApp[7324:60b] ------- foundButtons: 0
2014-01-15 00:25:39.339 TestApp[7324:60b] *******
2014-01-15 00:25:39.341 TestApp[7324:60b] ------- added button: 29
2014-01-15 00:25:39.342 TestApp[7324:60b] ------- foundButtons: 0
2014-01-15 00:25:39.345 TestApp[7324:60b] *******
2014-01-15 00:25:39.347 TestApp[7324:60b] ------- added button: 39
2014-01-15 00:25:39.350 TestApp[7324:60b] ------- foundButtons: 0
2014-01-15 00:25:39.352 TestApp[7324:60b] *******
2014-01-15 00:25:39.354 TestApp[7324:60b] ------- added button: 40
2014-01-15 00:25:39.355 TestApp[7324:60b] ------- foundButtons: 0
2014-01-15 00:25:39.357 TestApp[7324:60b] *******
2014-01-15 00:25:39.358 TestApp[7324:60b] ------- added button: 41
2014-01-15 00:25:39.360 TestApp[7324:60b] ------- foundButtons: 0
2014-01-15 00:25:39.361 TestApp[7324:60b] *******
2014-01-15 00:25:39.363 TestApp[7324:60b] ------- added button: 52
2014-01-15 00:25:39.364 TestApp[7324:60b] ------- foundButtons: 0
2014-01-15 00:25:39.366 TestApp[7324:60b] *******
2014-01-15 00:25:39.367 TestApp[7324:60b] ------- added button: 53
2014-01-15 00:25:39.368 TestApp[7324:60b] ------- foundButtons: 0
2014-01-15 00:25:39.370 TestApp[7324:60b] *******
2014-01-15 00:25:39.371 TestApp[7324:60b] ------- foundButtons: 0

显然，找到按钮工作正常，但它们没有被添加到新数组> 我只是不明白为什么。这似乎应该有效。

Answer 1

似乎您没有初始化 caualtiesArray。

caualtiesArray = [NSMutableArray 数组];