ios 重新加载一个 ViewController
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Reloading a ViewController
提问by Tiago Veloso
I have a View controller displaying some information (not table views).
我有一个视图控制器显示一些信息（不是表格视图）。
I have an update call to a remote server which fills my data base. I would like to completely reload my ViewController after the update call is done.
我有一个远程服务器的更新调用，它填满了我的数据库。我想在更新调用完成后完全重新加载我的 ViewController。
What should I do?
我该怎么办？
采纳答案by Rui Peres
You really don't need to do:
你真的不需要这样做：
[self.view setNeedsDisplay];
Honestly, I think it's "let's hope for the best" type of solution, in this case. There are several approaches to update your UIViews:
老实说，我认为这是一种解决方案，“我们希望最好的”在这种情况下。有几种方法可以更新您的UIViews：
- KVO
- Notifications
- Delegation
- KVO
- 通知
- 代表团
Each one has is pros and cons. Depending of what you are updating and what kind of "connection" you have between your business layer (the server connectivity) and the UIViewController, I can recommend one that would suit your needs.
每一种都有利有弊。根据您正在更新的内容以及您的业务层（服务器连接）与UIViewController.
回答by Moaz Saeed
If you know your database has been updated and you want to just refresh your ViewController (which was my case). I didn't find another solution but what I did was when my database updated, I called:
如果您知道您的数据库已更新并且您只想刷新您的 ViewController（这是我的情况）。我没有找到其他解决方案，但我所做的是在我的数据库更新时，我调用了：
[self viewDidLoad];
[self viewDidLoad];
again, and it worked. Remember if you override other viewWillAppear or loadView then call them too in same order. like.
再次，它奏效了。请记住，如果您覆盖其他 viewWillAppear 或 loadView，则也以相同的顺序调用它们。喜欢。
[self viewDidLoad]; [self viewWillAppear:YES];
[self viewDidLoad]; [self viewWillAppear:YES];
I think there should be a more specific solution like refresh button in browser.
我认为应该有一个更具体的解决方案，比如浏览器中的刷新按钮。
回答by juancazalla
If you want to reload a ViewController initially loaded from a XIB, you can use the next UIViewController extension:
如果要重新加载最初从 XIB 加载的 ViewController，可以使用下一个 UIViewController 扩展：
extension UIViewController {
func reloadViewFromNib() {
let parent = view.superview
view.removeFromSuperview()
view = nil
parent?.addSubview(view) // This line causes the view to be reloaded
}
}
回答by Patel Jigar
Try this, You have to call both methods to reload view, as this one works for me,
试试这个，你必须调用这两种方法来重新加载视图，因为这个对我有用，
-Objective-C
-目标-C
[self viewDidLoad];
[self viewWillAppear:YES];
-Swift
-迅速
self.viewDidLoad()
self.viewWillAppear(true)
回答by Shubhank
Update the data ... change button titles..whatever stuff you have to update..
更新数据……更改按钮标题……无论您需要更新什么……
then just call
然后就打电话
[self.view setNeedsDisplay];
回答by Shubhank
Direct to your ViewController again. in my situation [self.view setNeedsDisplay];and [self viewDidLoad]; [self viewWillAppear:YES];does not work, but the method below worked.
再次指向您的 ViewController。在我的情况下 [self.view setNeedsDisplay];并[self viewDidLoad]; [self viewWillAppear:YES];不起作用，但下面的方法有效。
In objective C
在目标 C
UIStoryboard *MyStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil ];
UIViewController *vc = [MyStoryboard instantiateViewControllerWithIdentifier:@"ViewControllerStoryBoardID"];
[self presentViewController:vc animated:YES completion:nil];
Swift:
迅速：
let secondViewController = self.storyboard!.instantiateViewControllerWithIdentifier("ViewControllerStoryBoardID")
self.presentViewController(secondViewController, animated: true, completion: nil)
回答by Vincent
It is not advised to call ViewDidLoad or ViewWillAppear by yourself.
不建议自行调用 ViewDidLoad 或 ViewWillAppear。
In the ViewDidLoad include a loadData() function to prepare the data. This is executed in the initial run.
在 ViewDidLoad 中包含一个 loadData() 函数来准备数据。这是在初始运行时执行的。
When you want to reload, call loadData() again to get the data from model. In a tableView call reloadData() or in a regular view setNeedsDisplay().
当你想重新加载时，再次调用 loadData() 从模型中获取数据。在 tableView 调用 reloadData() 或在常规视图 setNeedsDisplay() 中。
回答by Muhammad Aamir Ali
Reinitialise the view controller
重新初始化视图控制器
YourViewController *vc = [[YourViewController alloc] initWithNibName:@"YourViewControllerIpad" bundle:nil];
[self.navigationController vc animated:NO];
回答by plop
You Must use
你必须使用
-(void)viewWillAppear:(BOOL)animated
and set your entries like you want...
并根据需要设置您的条目...
