从实用程序应用程序的FlipSideView返回时强制重新加载视图 [英] Forcing Reload of View when returning from FlipSideView of Utility Application

问题描述

我有一个iPhone 3.1.3的实用程序应用程序。我的主视图加载良好。我翻到实用程序应用程序的反面视图并更改一些设置。

I've got a Utility Application for iPhone 3.1.3. I have my main view loading fine. I flip over to the flipside view of the utility app and change some settings. How can I call the code I've currently got in viewDidLoad in the main view to refresh it, as settings have changed?

我是否创建一个公共方法并从另一侧视图的viewDidUnload方法中调用它？是否直接调用 viewDidLoad ？最好的方法是什么？

Do I create a public method and call it from the viewDidUnload method of the flipside view? Do I call viewDidLoad directly? What's the best way to do this?

推荐答案

首先，永远不要调用 viewDidLoad 直接。它可能不会造成任何问题，但是最好保留仅由基础API调用的方法。只需将一些视图初始化移到新方法中，例如 configureViewForSettings 或类似的方法。

Firstly, you should never call viewDidLoad directly. It probably won't cause any problems, but it's best to leave a method like that to be called by the underlying API only. Just move out some of the view initialization into a new method like configureViewForSettings or something along those lines.

最好方法将是使用委托。当您需要将某种数据或通知发送回父视图时，这是最合适的。使用诸如 settingsViewChangedSettings：（MySettingsView *）settingsView 之类的方法创建新协议 MySettingsViewDelegate 。然后在设置视图控制器上添加 id< MySettingsViewDelegate>委托属性。

The best approach would be to use delegation. This is most suitable when you need to send back some sort of data or notification to a 'parent' view. Create a new protocol MySettingsViewDelegate with a method like settingsViewChangedSettings:(MySettingsView *)settingsView. Then on your settings view controller add a id<MySettingsViewDelegate> delegate property.

更改设置时，调用委托方法如下：

When the settings change call the delegate method like this:

[self.delegate settingsViewChangedSettings:self];

在主视图控制器中，当您创建/显示设置视图时，将自己设置为委托

And in your main view controller, when you create/display the settings view, set yourself to be the delegate

mySettingsView.delegate = self;
/* Display the settings view */

然后在某处：

- (void)settingsViewChangedSettings:(MySettingsView *)settingsView {
    /* Settings changed, refresh your view */
    [self configureViewForSettings];
}

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