在 iOS 中切换视图控制器的最佳方式
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Best way to switch View Controller in iOS
提问by user1191140
I have 2 view controllers in my project. Inside View Controller1 I want to switch to View Controller 2 by press of a button. Currently I do this
我的项目中有 2 个视图控制器。在 View Controller1 中，我想通过按下按钮切换到 View Controller 2。目前我这样做
- (IBAction)startController2:(id)sender {
viewController1 vc2 = [[viewController2 alloc] init];
self.view = vc2.view;
}
This seems to work fine, but there is a big delay (4 secs) between the button press and second view controller appears. If I call the viewController2 directly from the AppDelegate things load faster. What am I doing wrong here. Any help is greatly appreciated.
这似乎工作正常，但按钮按下和第二个视图控制器出现之间有很大的延迟（4 秒）。如果我直接从 AppDelegate 调用 viewController2，则加载速度会更快。我在这里做错了什么。任何帮助是极大的赞赏。
回答by ckhan
Several things to consider.
需要考虑的几件事。
Part 1: "What am I doing wrong here"?
第 1 部分：“我在这里做错了什么”？
You definitely didn't mean to do
self.view = vc2.view. You just put one view controller in charge of another view controller's view. What you probably mean to say was[self.view addSubview:vc2.view]. This alone might fix your problem, BUT...Don't actually use that solution. Even though it's almost directly from the samples in some popular iPhone programming books, it's a bad idea. Read "Abusing UIViewControllers"to understand why.
你绝对不是故意的
self.view = vc2.view。您只需让一个视图控制器负责另一个视图控制器的视图。你可能想说的是[self.view addSubview:vc2.view]。仅此一项就可以解决您的问题，但是...不要实际使用该解决方案。尽管它几乎直接来自一些流行的 iPhone 编程书籍中的示例，但它是一个坏主意。阅读“滥用 UIViewControllers”以了解原因。
Part 2: What you should be doing
第 2 部分：您应该做什么
It's all in the chapter "Presenting View Controllers from Other View Controllers".
这一切都在“从其他视图控制器呈现视图控制器”一章中。
It'll come down to either:
它会归结为：
a UINavigationController, (see the excellent Apple guide to them here) and then you simply
[navigationController pushViewController:vc2]a "manually managed" stack of modal view controllers, as andoabhay suggests
explicitly adding a VC as child of another, as jason suggests
一个 UINavigationController，（在这里查看优秀的 Apple 指南）然后你只需
[navigationController pushViewController:vc2]正如andoabhay所建议的那样，“手动管理”的模态视图控制器堆栈
正如杰森建议的那样，明确添加一个 VC 作为另一个的孩子
回答by Jason
You should consider using UINavigationControllerto switch view controllers. If your building target is iOS 5.0+, you can also use the new controller container concept: [mainViewController addChildViewController:childViewController].
您应该考虑使用UINavigationController来切换视图控制器。如果您的构建目标是 iOS 5.0+，您还可以使用新的控制器容器概念：[mainViewController addChildViewController:childViewController].
回答by androabhay
Use presentModalViewControlleras follows
使用presentModalViewController如下
[self presentModalViewController:vc2 animated:YES completion:^(void){}];
and in the viewController1use
并且在viewController1使用中
[self dismissModalViewControllerAnimated:YES completion:^(void){}];
where ever you want to go back to previous controller.
你想回到以前的控制器的地方。
回答by u7950582
[aController presentViewController:bController animated:NO completion:nil];
[bController presentViewController:cController animated:NO completion:nil];
when you want dismiss cController, you can do like this
当你想解雇 cController 时，你可以这样做
[aController dismissViewControllerAnimated:NO completion:nil];
this is the flow chart.
这是流程图。
aController → bController → cController
↑___________________________↓
回答by Sohail
You should use UINavigationController to switch view controllers.
您应该使用 UINavigationController 来切换视图控制器。
You are on View1 and add the following code on button click method.
您在 View1 上并在按钮单击方法上添加以下代码。
View2 *View2Controller = [[View2 alloc] initWithNibName:@"View2" bundle:nil];
[self.navigationController pushViewController:view2Controller animated:YES];
View2 *View2Controller = [[View2 alloc] initWithNibName:@"View2" bundle:nil];
[self.navigationController pushViewController:view2Controller animated:YES];
