ios 在presentViewController中应该完成什么？
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what should go into completion in presentViewController?
提问by lakesh
I am using presentViewControllerin xcode and not sure what should go into completion.
我presentViewController在 xcode 中使用，不确定应该完成什么。
The code given by xcode documentation:
xcode 文档给出的代码：
- (void)presentViewController:(UIViewController *)viewControllerToPresent animated: (BOOL)flag completion:(void (^)(void))completion NS_AVAILABLE_IOS(5_0);
Example that i am using:
我正在使用的示例：
[self presentViewController:second animated:YES completion:<#^(void)completion#>];
What should go into completion?
什么应该进入完成？
回答by Midhun MP
You can use the below code instead:
您可以改用以下代码：
[self presentViewController:second animated:YES completion:^{ }];
or you can simply pass NULL
或者你可以简单地传递 NULL
[self presentViewController:second animated:YES completion:NULL];
The completion block is used for doing any tasks after presenting the view controller , the code written inside the completion block will execute only after the view is presented.
完成块用于在呈现视图控制器后执行任何任务，完成块中编写的代码只有在呈现视图后才会执行。
回答by abhishekkharwar
@try this
@尝试这个
[self presentViewController:second animated:YES completion:^{[self animationCompleted];}];
-(void)animationCompleted{
// Whatever you want to do after finish animation
NSLog(@"Animation Completed")
}
if you don't want to do anything on completion of animation
如果你不想在动画完成时做任何事情
[self presentViewController:second animated:YES completion:NULL];
回答by Nimit Parekh
You can use the following code for the presenting the view
您可以使用以下代码来呈现视图
[[self navigationController] dismissViewControllerAnimated:YES completion:NULL];
Following is the code for the that
以下是代码
SecondViewController *second = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
[self presentViewController:second animated:YES completion:nil];
For more detail check the apple forum discussion
有关更多详细信息，请查看苹果论坛讨论
回答by Michael
Swift 2.0
斯威夫特 2.0
Handle something on completion
完成后处理某事
viewController.presentViewController(anotherViewController, animated: true, completion: {
// Whatever you'd like to do when presentViewController completes :)
})
Or do nothing on completion
或者完成后什么都不做
viewController.presentViewController(anotherViewController, animated: true, completion: nil)
