iphone - 获取正在平移的 View 的字典键并将其添加到数组中

Question

我在 NSMutableDictionary 中有一堆 UIImageView。

我的imageview创建方法:

for (int i = 1; i <= 5; i++)
{
    char a = 'a';
    NSString *key = [NSString stringWithFormat:@"%c%d", a, i];
    alphabetVowelA = [[UIImageView alloc] initWithFrame:CGRectMake(39, 104, 70, 70)];
    [alphabetVowelA setImage:[UIImage imageNamed:@"a.png"]];
    alphabetVowelA.tag = i;
    [alphabetVowelA setUserInteractionEnabled:YES];
    [self addGestureRecognizersToPiece:alphabetVowelA];
    [letterDictionary setObject:alphabetVowelA forKey:key]; //Adds the letter a UIImageView to dictionary with key: a1, a2, a3, a4, a5. 
    [self.view addSubview:alphabetVowelA];
    [alphabetVowelA release];
}

这是我的平移手势方法。

- (void)panPiece:(UIPanGestureRecognizer *)gestureRecognizer
{
    UIView *piece = [gestureRecognizer view];
    [self.view bringSubviewToFront:piece];


    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {

        CGPoint translation = [gestureRecognizer translationInView:[piece superview]];

        CGRect startingPointFrame = CGRectMake(245, 428, 31, 20);
        [startingPoint setFrame:startingPointFrame];

        [piece setCenter:CGPointMake([piece center].x + translation.x, [piece center].y + translation.y)];
        [gestureRecognizer setTranslation:CGPointZero inView:[piece superview]];
    }


    if ([gestureRecognizer state] == UIGestureRecognizerStateEnded)
    {

        pannedPieces = [[NSMutableArray alloc] init];

        [pannedPieces addObject:piece];


        NSEnumerator *enumerator = [pannedPieces objectEnumerator];
        id element;

        NSUInteger arrayCount = [pannedPieces count];

        while(element = [enumerator nextObject])
        {
            NSUInteger i = [pannedPieces indexOfObject:element];
            NSLog(@"%@ \n @index %i \n Array Count: %i",element, i, arrayCount);
        }
}

我正在尝试将平移和删除的 View 添加到 NSMutableArray 中，以便我可以独立于所有其他 View 处理这些 View 。使用我上面的代码时，似乎每一个被平移的片段都没有将自己添加到数组的末尾，它每次只将它放在索引 0 处。因此，无论我平移了多少 View ，我的@index 都会打印 0，Array Count 会打印 1。

不是只添加被平移的“片段”，而是如何获取被平移的 UIImageView 的字典键，以便我可以将它通过键添加到数组中？

我希望这个问题是有道理的。

Answer 1

这一行:

pannedPieces = [[NSMutableArray alloc] init];

每次进入该分支时都会用新数组覆盖 pannedPieces(也可能会泄漏)。如果您想收集更多碎片，请不要使用新数组，只需添加到现有数组即可。

要从字典中获取对象的键，请使用 -allKeysForObject: .