故事板会导致内存泄漏 [英] Storyboard segues causing memory leaks

问题描述

我有两个UIViewControllers与按钮触发segue（modal）彼此。我想发现，如果这是造成任何内存泄漏，而来回跳动，我看到生活对象&分配的内存正在上升，最终会留给应用程序崩溃。我没有任何单行代码 - 使用纯UIViewControllers。

I have two UIViewControllers with buttons triggering segue (modal) to each other. I wanted to discover if that's causing any memory leaks while jumping back and forth and I see that Living Object && allocated memory is going up, what eventually would leave to app crash. I don't have any single line of code - working with pure UIViewControllers.

我可能做错什么？
我可能在项目设置中设置了错误吗？
我是否严重地读取profiler的静态绑定？
在使用segue时，我需要执行任何特殊的释放命令吗？

What I might be doing wrong?
Could have I set something wrong in project settings?
Am I reading profiler's statictics badly?
Do I need to make any special release commands while working with segues?

推荐答案

您没有正确使用模态段落。你实现它的方式，你创建一个新的实例的每个视图控制器，当你segue，而不是返回到你的实例。这是为什么你的内存使用率持续增加。

You aren't using the modal segues correctly. The way you have implemented it, you are creating a new instance of each view controller when you segue instead of returning to the instance you came from. That is why your memory usage continues to increase.

在iOS 6之前，正确的处理方式是：

Before iOS 6, the correct way to handle this was to:

1）在视图控制器1中定义一个诸如 viewController2Done 的方法

2）在视图控制器2中，创建一个名为 $ 中的 c>委托 c> >对于视图控制器1，将视图控制器2中的委托设置为 self

4）视图控制器2，当是时候返回到视图控制器1，调用 [delegate viewController2Done]

5）在 viewController2Done 调用 [self dismissModalViewControllerAnimated：YES]


1) define a method such as viewController2Done in view controller 1
2) in view controller 2, create a property called delegate of type id.
3) in prepareToSegue for view controller 1, set delegate in view controller 2 to self
4) in view controller 2, when it is time to return to view controller 1, call [delegate viewController2Done]
5) in viewController2Done call [self dismissModalViewControllerAnimated:YES]

iOS 6，但也有一个新的 unwind segue 可以使用。要使用它，您需要在视图控制器1中定义一个方法，如下所示：

This method still works in iOS 6, but there is also a new unwind segue that can be used instead. To use it, you would define a method in your view controller 1 like so:

Objective-C：

- (IBAction)unwindFromViewController2:(UIStoryboardSegue *)segue
{
    NSLog(@"and we are back");
}

Swift： b

@IBAction func unwindFromViewController2(segue: UIStoryboardSegue) {
    print("and we are back")
}

然后，您可以控制从视图控制器2中的按钮拖动到视图控制器上方的栏中的橙色退出图标故事板。在弹出窗口中，您可以选择 unwindFromViewController2 ，完成操作。

Then you'd control drag from the button in view controller 2 to the orange exit icon in the bar above the view controller in the Storyboard. In the pop up, you'd select unwindFromViewController2 and voila, you're done.

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