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我遇到了我认为是UICollisionBehaviorin的错误UIKit。将它们添加到数组UIViews会导致内存泄漏。我整理了一个简单的演示项目，该项目创建了 10 个动画，其中一组视图在重力作用下下落，并与封闭视图的边界发生碰撞。（代码如下。） Instruments 中的 Leaks 模板每次运行报告 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;
    }
}

我真的很希望能够在我正在开发的应用程序中实现碰撞，但是这种泄漏使它无法使用。我已经尝试将碰撞行为保存在属性中并重用它。这可以防止泄漏除了一个 64 字节的内存块之外的所有内存，但是当它完成时冲突不再起作用。任何人都可以提出一个可行的解决方法吗？

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1 回答 1

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

addBoundaryWithIdentifier

不幸的是，为我设定了界限translatesReferenceBoundsIntoBoundary并setTranslatesReferenceBoundsIntoBoundaryWithInsets导致了泄漏。

于 2014-05-05T03:01:25.820 回答