問題描述

我正在嘗試設(shè)置 UIScrollView，以便可以在 3 個視圖控制器之間滑動.這是我在 AppDelegate.m 中的代碼:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];//應(yīng)用程序啟動后自定義的覆蓋點(diǎn).;UIScrollView *sv = [[UIScrollView alloc] init];BarsViewController *bvc = [[BarsViewController alloc] init];//創(chuàng)建 BarsViewControllerStopwatchViewController *svc = [[StopwatchViewController alloc] init];//創(chuàng)建 StopwatchViewControllerTimerViewController *tvc = [[TimerViewController alloc] init];//創(chuàng)建 TimerViewController[sv addSubview:bvc.view];[sv addSubview:svc.view];[sv addSubview:tvc.view];[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];//隱藏狀態(tài)欄self.window.rootViewController = sv;[self.window makeKeyAndVisible];返回是；}

它在這一行給出一個錯誤:

self.window.rootViewController = sv;

說，不兼容的指針類型從 UIScrollView * 分配給 'UIViewController *'".

但是，沒有 UIScrollViewController 這樣的東西，所以我不知道該怎么做.

基本上，我只想讓整個屏幕成為一個滾動視圖，讓我可以在我的 3 個視圖控制器之間滑動.我該怎么做呢?

UPD:2015 年 6 月斯威夫特

這個概念保持不變，這在下面的 Objective-C 部分中進(jìn)行了描述.語法有一點(diǎn)變化.要添加 childviewcontroller，請使用以下代碼段:

讓 aViewController = storyboard.instantiateViewControllerWithIdentifier("A") as！視圖控制器；addChildViewController(aViewController);scrollView!.addSubview(aViewController.view)aViewController.didMoveToParentViewController(self)

查看我的

I am trying to set up a UIScrollView so that I can swipe between my 3 view controllers. This is my code in AppDelegate.m:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.;

UIScrollView *sv = [[UIScrollView alloc] init];

BarsViewController *bvc = [[BarsViewController alloc] init]; // Create BarsViewController
StopwatchViewController *svc = [[StopwatchViewController alloc] init]; // Create StopwatchViewController
TimerViewController *tvc = [[TimerViewController alloc] init]; // Create TimerViewController

[sv addSubview:bvc.view];
[sv addSubview:svc.view];
[sv addSubview:tvc.view];

[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade]; // Hide status bar

self.window.rootViewController = sv;
[self.window makeKeyAndVisible];
return YES;
}

It gives an error on this line:

self.window.rootViewController = sv;

saying, "Incompatible pointer types assigning to 'UIViewController *' from UIScrollView *'".

However, there is no such thing as a UIScrollViewController, so I don't know what to do.

Basically, I just want the whole screen to be a scroll view which allows me to swipe between my 3 view controllers. How would I go about doing that?

UPD: June, 2015 Swift

The concept remains the same, which is described below in Objective-C section. There is a little change in syntax. To add childviewcontroller use following snippet:

let aViewController = storyboard.instantiateViewControllerWithIdentifier("A") as! AViewController;

addChildViewController(aViewController);
scrollView!.addSubview(aViewController.view)
aViewController.didMoveToParentViewController(self)

Check my Swift Github Sample Code

Objective-C

Create your own custom container view controller (I will call it combinedViewController), which will hold your three controllers in scroll view. Inherit like you always do UIViewController, then use addChildViewController public API in your new combinedViewController -viewDidLoad: like this:

[self addChildViewController:aViewController];
[self.scrollView addSubview:aViewController.view];
[aViewController didMoveToParentViewController:self];

Here’s what the code does:

• It calls the container’s addChildViewController: method to add the child.
• It accesses the child’s view property to retrieve the view and adds it to its own view hierarchy. The container sets the child’s size and position before adding the view; containers always choose where the child’s content appears.
• It explicitly calls the child’s didMoveToParentViewController: method to signal that the operation is complete.

Do this operation with each of your viewControllers. Afterwards, set your combinedViewController as a rootViewController.

if you need further explanation, feel free to ask.

Reference: Design custom container view controller

Here you are my Objective-C Github sample code

UPD: Thanks @Oliver Atkinson for clarifying that addChildViewController: method also calls the child’s willMoveToParentViewController: method automatically.

Results:

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