iOS：如何实现Android的startActivityForResult等行为 [英] iOS: How to achieve behavior like Android's startActivityForResult

问题描述

我是Android应用程序的iOS版本开发人员。我需要知道如何在Android上实现类似于startActivityForResult的行为。我需要显示一个新的视图控制器，然后在新的视图控制器关闭时控制返回到前一个视图控制器。我还需要一个当时触发的回调方法。

I'm an Android developer working on an iOS version of our app. I need to know how to achieve behavior similar to startActivityForResult on Android. I need to show a new view controller, then have control return to the previous view controller when the new view controller is closed. I also need a callback method to be triggered at that time.

如何在iOS中实现这一目标？

How can I achieve this in iOS?

推荐答案

有几种方式，所以大多数情况下你会用各种模式自己做。您可以在应用程序委托中设置导航控制器，如下所示：

There are a couple ways, so mostly you do this yourself with various patterns. You can set up a navigation controller in the app delegate as follows:

self.viewController = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil];
self.navigationController = [[ UINavigationController alloc ] initWithRootViewController:self.viewController ];
self.window.rootViewController = self.navigationController;
[self.window makeKeyAndVisible];

然后当你想要一个新的vc时，你可以这样做：

Then when you want to present a new vc you can do this:

OtherViewController *ovc = [[ OtherViewController alloc ] initWithNibName:@"OtherViewController" bundle:nil ];
[ self.navigationController pushViewController:ovc animated:YES ];

返回执行此操作：

[ self.navigationController popViewControllerAnimated:YES ];

就回调问题而言，一种方法是在你的某个地方制作这样的协议project：

As far as a callback goes one way to do this is to make a protocol like this somewhere in your project:

@protocol AbstractViewControllerDelegate <NSObject>

@required
- (void)abstractViewControllerDone;

@end

然后让你想要回调的每个视图控制器成为在代表中触发：

Then make each view controller you want a callback to be triggered in a delegate aka:

 @interface OtherViewController : UIViewController <AbstractViewControllerDelegate>

 @property (nonatomic, assign) id<AbstractViewControllerDelegate> delegate;

 @end

最后当你提出一个新的vc时，将它指定为委托：

Finally when you present a new vc assign it as a delegate:

  OtherViewController *ovc = [[ OtherViewController alloc ] initWithNibName:@"OtherViewController" bundle:nil ];
  ovc.delegate = self;
  [ self.navigationController pushViewController:ovc animated:YES ];

然后当你解雇ovc时，拨打这个电话

then when you dismiss the ovc, make this call

 [self.delegate abstractViewControllerDone];
 [ self.navigationController popViewControllerAnimated:YES ];

在rootVC中，符合您所制定的协议，您只需填写此方法：

And in the rootVC, which conforms to the protocol you made, you just fill out this method:

 -(void) abstractViewControllerDone {

 }

你刚刚打过电话。这需要大量的设置，但其他选项包括查看NSNotifications和块，这可以更简单，具体取决于你做什么。

That you just made a call to. This requires a lot of setup but other options include looking into NSNotifications and blocks which can be simpler depending on what your doing.

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