所以,我有一些边界( addBoundaryWithIdentifier:
),有一个代码,每秒用 UIView
正方形) > performSelector:
,块落下,如果发生与边界的碰撞,我会删除项目。
现在,如果我添加UILabel进行查看,内存使用量会慢慢增加到15Mb,然后停止攀升。
没有UILabel使用的内存: 使用UILabel的内存: 几分钟后使用UILabel的内存:
这里发生了什么?如何解决?我应该解决这个问题吗?
这是我正在使用的代码。
@implementation ESViewController {
UIPushBehavior *pushBlock;
UIDynamicAnimator *mainAnimator;
UICollisionBehavior *blockCollision;
}
- (void)viewDidLoad {
[super viewDidLoad];
// UILabel *label = [[UILabel alloc] initWithFrame: CGRectMake(110, 400, 100, 50)];
// [label setText:@"Hello"];
// [label setTextAlignment: NSTextAlignmentCenter];
// [self.view addSubview: label];
mainAnimator = [[UIDynamicAnimator alloc] initWithReferenceView: self.view];
blockCollision = [[UICollisionBehavior alloc] initWithItems: @[]];
[blockCollision addBoundaryWithIdentifier:@"bottom"
fromPoint:CGPointMake(0, 480)
toPoint:CGPointMake(320, 480)];
[blockCollision addBoundaryWithIdentifier:@"left"
fromPoint:CGPointMake(0, 480)
toPoint:CGPointMake(0, 0)];
[blockCollision addBoundaryWithIdentifier:@"right"
fromPoint:CGPointMake(320, 480)
toPoint:CGPointMake(320, 0)];
[blockCollision addBoundaryWithIdentifier:@"top"
fromPoint:CGPointMake(0, -40)
toPoint:CGPointMake(320, -40)];
[blockCollision setCollisionDelegate: (id<UICollisionBehaviorDelegate>)self];
[mainAnimator addBehavior: blockCollision];
pushBlock = [[UIPushBehavior alloc] initWithItems: @[] mode: UIPushBehaviorModeContinuous];
[pushBlock setAngle: M_PI/2 magnitude:0.05];
[mainAnimator addBehavior: pushBlock];
[self movingBlocks];
}
- (void) movingBlocks {
UIView *block = [[UIView alloc] initWithFrame:CGRectMake(arc4random() % 320, -20, 20, 20)];
[block setBackgroundColor: [UIColor brownColor]];
[self.view addSubview: block];
[blockCollision addItem: block];
[pushBlock addItem: block];
[self performSelector:@selector(movingBlocks) withObject:nil afterDelay:0.05];
}
- (void)collisionBehavior:(UICollisionBehavior *)behavior
beganContactForItem:(id<UIDynamicItem>)item
withBoundaryIdentifier:(id<NSCopying>)identifier
atPoint:(CGPoint)p {
[pushBlock removeItem:item];
[blockCollision removeItem:item];
[(UIView*)item removeFromSuperview];
}
@end
答案 0 :(得分:2)
我已经复制了你所描述的症状,但我相信Xcode对你说谎,你应该打开雷达(bugreport.apple.com)。
如果您在Instruments中运行此功能,则内存使用情况与您的预期完全一致。我试过在发布模式下使用Xcode配置文件(比如Instruments),我已经在所有iPad模拟器上运行了。该症状在Xcode中非常可重复,而Instruments显示预期结果并且非常稳定。我甚至将一个显示Xcode增长的运行流程转移到了Instruments,而且仪器仍然没有增长。我会说Xcode在这里被破坏了。