Question

我在NSMutableDictionary中有一堆UIImageViews。

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);
        }
}

我正在尝试将已淘汰的视图添加到NSMutableArray，以便我可以独立于所有其他视图使用这些视图。使用上面的代码执行它时，似乎每个被淘选的部分都不会将自身添加到数组的末尾，它每次只将它放在索引0处。所以我的@index打印0，无论我淘汰了多少个视图，数组计数都会打印1。

不是只添加被淘汰的“片段”，而是如何获取平移UIImageView的字典键，以便我可以通过键将其添加到数组中？

我希望这个问题有道理。

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（可能还会泄漏）。如果要收集更多碎片，请不要使用新阵列，只需添加到现有阵列即可。

要从字典中获取对象的密钥，请使用-allKeysForObject:。

获取平移视图的字典键并将其添加到数组中

1 个答案: