UICollisionBehavior内存泄漏

Question

我在UIKit中遇到了UIKit中的一个bug。将它们添加到UIViews数组中会导致内存泄漏。我制作了一个简单的演示项目，它创建了10个视图的动画，这些视图随着重力的应用而下降，并与包围视图的界限发生冲突。(代码如下)仪器中的泄漏模板为每次运行报告9个64字节的泄漏。

- (void)doAnimation
{
    self.animateButton.enabled = NO;

    CGFloat left = 12.0f;
    NSMutableArray *items = [NSMutableArray new];

    // set up an array of views and add them to the superview
    while (left < self.view.bounds.size.width - 12.0f) {
        UIView *view = [[UIView alloc] initWithFrame:CGRectMake(left, 70, 32, 32)];
        left += 34.0f;
        [self.view addSubview:view];
        view.backgroundColor = [UIColor grayColor];
        [items addObject:view];
    }

    // create a gravityBehavior and initialize with views array
    UIGravityBehavior *gravity = [[UIGravityBehavior alloc] initWithItems:items];
    [self.animator addBehavior:gravity];

    // create a collisionBehavior and initialize with views array
    UICollisionBehavior *collision = [[UICollisionBehavior alloc] initWithItems:items];
    collision.translatesReferenceBoundsIntoBoundary = YES;
    [self.animator addBehavior:collision];
}

// UIDynamicAnimatorDelegate method that's called when collision animation is complete
- (void)dynamicAnimatorDidPause:(UIDynamicAnimator *)animator
{
    // get a collision behavior in order to access its items for loop below
    UICollisionBehavior *behavior;
    for (UIDynamicBehavior *oneBehavior in animator.behaviors) {
        if ([oneBehavior isKindOfClass:[UICollisionBehavior class]]) {
            behavior = (UICollisionBehavior *)oneBehavior;
            break;
        }
    }

    // reset the UIDynamicAnimator property's behaviors for next run
    [self.animator removeAllBehaviors];

    self.dropCount++;

    // remove all subviews
    for (UIView *view in behavior.items) {
         [view removeFromSuperview];
    }

    // run the animation again or break
    if (self.dropCount < 10) {
        [self doAnimation];
    } else {
        self.animateButton.enabled = YES;
    }
}

我非常希望能够在我正在开发的应用程序中实现冲突，但是这个漏洞使得它无法使用。我已经尝试将collisionBehavior保存在属性中并重用它。这样可以防止泄漏除一个64字节的内存块之外的所有内存块，但是当冲突完成时，冲突就不再起作用了。有人能提出一个可行的解决办法吗？

Answer 1

我遇到了同样的问题，但是通过使用UICollisionBehavior的设置边界来修复内存泄漏

addBoundaryWithIdentifier

不幸的是，使用translatesReferenceBoundsIntoBoundary和setTranslatesReferenceBoundsIntoBoundaryWithInsets设置边界给我造成了泄漏。