objective-c - 线程 1：更改 ViewController 时的 EXC_BAD_ACCESS

Question

我需要碰碰我的 ViewControllers，所以我使用了这个函数：

(void)pushViewFromRight:(UIViewController*)coming over:(UIViewController*)going {
    CGRect frameComing = coming.view.frame;
    CGRect frameGoing = going.view.frame;
    frameComing.origin.x = 0;
    frameComing.origin.y = -460;
    coming.view.frame = frameComing;
    if ([coming.view superview] == nil)
        [SlideContainer addSubview:coming.view];

    [UIView beginAnimations:@"frame" context:nil];
    [UIView setAnimationDuration:1];

    [coming viewWillAppear:YES];
    [going viewWillAppear:YES];
    frameComing.origin.y = 0;
    coming.view.frame = frameComing;
    going.view.frame = frameGoing;
    [going viewDidDisappear:YES];
    [coming viewDidAppear:YES];

    [UIView commitAnimations];

}

在第二个 ViewController 上，我创建了一个返回按钮。但是当我想返回时（即使按下按钮后没有任何操作），它会因 EXC_BAD_ACCESS 而崩溃。为什么会这样？