了解iOS上的仪器内存分配日志

我已经构建了一个几乎已经完成的iOS应用程序,但是,我最近经历过它由于"内存压力"而崩溃.所以我开始在Instruments中分析内存分配,当然,应用程序确实使用了相当多的内存,而且在使用过程中似乎只会增加.

但是,对于仪器内存分配来说相对较新,我无法破译52%的分配,如下面的屏幕截图所示:

它显然与Core Animation有关,但究竟对我来说难以确定,所以我认为一些聪明的头脑可能知道答案.

面包屑:

我的应用程序使用自定义segue,在视图控制器之间移动时,正在进行大量动画.这是一个例子:

@interface AreaToKeyFiguresSegue : UIStoryboardSegue

@end

...

@implementation AreaToKeyFiguresSegue

- (void)perform
{
    [self sourceControllerOut];
}

- (void)sourceControllerOut
{
    AreaChooserViewController *sourceViewController = (AreaChooserViewController *) [self sourceViewController];
    KeyFigureViewController *destinationController = (KeyFigureViewController *) [self destinationViewController];

    double ratio = 22.0/sourceViewController.titleLabel.font.pointSize;

    sourceViewController.titleLabel.adjustsFontSizeToFitWidth = YES;

    [UIView animateWithDuration:TRANSITION_DURATION delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{

        // Animate areaChooser
        sourceViewController.areaChooserScrollView.alpha = 0;
        sourceViewController.areaScrollViewVerticalSpaceConstraint.constant = -300;

        sourceViewController.backButtonVerticalConstraint.constant = 20;
        sourceViewController.backButton.transform = CGAffineTransformScale(sourceViewController.backButton.transform, ratio, ratio);
        sourceViewController.backButton.titleLabel.textColor = [UIColor redKombitColor];

        sourceViewController.backArrowPlaceholderVerticalConstraint.constant = 14;
        sourceViewController.backArrowPlaceholder.alpha = 1;

        sourceViewController.areaLabelVerticalConstraint.constant = 50;
        sourceViewController.areaLabel.alpha = 1;

        [sourceViewController.view layoutIfNeeded];

    } completion:^(BOOL finished) {
        [destinationController view]; // Make sure destionation view is initialized before animating it
        [sourceViewController.navigationController pushViewController:destinationController animated:NO]; // Push new viewController without animating it

        [self destinationControllerIn]; // Now animate destination controller
    }];
}

- (void)destinationControllerIn
{
    AreaChooserViewController *sourceViewController = (AreaChooserViewController *) [self sourceViewController];
    KeyFigureViewController *destinationController = (KeyFigureViewController *) [self destinationViewController];

    destinationController.keyFigureTableViewVerticalConstraint.constant = 600;
    destinationController.keyFigureTableView.alpha = 0.0;
    destinationController.allFavoritesSegmentedControl.alpha = 0.0;
    [destinationController.view layoutIfNeeded];
    [sourceViewController.segueProgress setHidden:YES];
} 

@end

每当要弹出一个视图控制器时,我只是做相反的事情:

- (IBAction)goBack:(id)sender
{
    [UIView animateWithDuration:TRANSITION_DURATION delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{

        [self.keyFigureTableView setAlpha:0];
        self.keyFigureTableViewVerticalConstraint.constant = 700;
        [self.allFavoritesSegmentedControl setAlpha:0];
        [self.view layoutIfNeeded];
    } completion:^(BOOL finished) {
        [self.navigationController popViewControllerAnimated:NO]; // Pop viewController without animating it
    }];
}

编辑:

大多数内存分配在推送视图控制器时发生,即使它之前已经显示过.我会从

A - > B - > C.

B < - C.

B - > C.

其中" - >"= push和"< - "= pop,每个" - >"分配更多内存,"< - "永不释放任何内存.

更多详情

根据乐器,我没有僵尸也没有泄漏.静态分析也没有给出什么.我的应用程序只是不断分配内存,直到它最终崩溃.

大约70%的内存分配发生在以下调用堆栈中,这与我的代码(反向调用树)无关: