分段控制改變時更改視圖控制器

Question

這個問題讓我瘋狂。當用戶更改分段控件的選定「選項卡」時，我試圖更改viewController。我花了幾個小時的時間進行研究，一直未能找到可以通過故事板完成的答案。

它真的很麻煩，因爲設置選項卡應用程序非常簡單，但試圖使用像Tab應用程序一樣的分段控件只是不起作用。我已經知道如何檢測在分段控制中選擇哪個索引。我怎樣才能做到這一點？

非常感謝。

Answer 1

我會說這是多少卡如果要在UIViewController內更改子視圖，則可以在故事板中設置子視圖，並在控制器中將它們與IBOulets掛鉤，您可以將視圖的hidden屬性設置爲YES或NO，具體取決於所單擊的控件。

現在，如果您使用@Robotic Cat的方法，這也是一個很好的解決方案，您可以在應用程序的工作方式上有更多的模塊化，考慮到您必須使用我提供的解決方案將所有邏輯放在一個控制器中。

Answer 2

UISegmentedControl有點不同，它沒有委託協議，你必須使用「添加目標」樣式。在你的情況下，你想要做的是添加一個目標，當UISegmentedControl改變時（這可能是父視圖控制器），然後該目標可以處理標籤切換。

例如：

[self.mainSegmentedControl addTarget:self action:@selector(changedSegmentedControl:) forControlEvents:UIControlEventValueChanged]; 

在這個例子中，代碼被從一些視圖/控制器可以訪問的變量的分段控制調用。我們添加自己以獲取changedSegmentedControl：方法。

那麼你就必須像這樣一種方法：

- (void)changedSegmentedControl:(id)sender 
{ 
    UISegmentedControl *ctl = sender; 
    NSLog(@"Changed value of segmented control to %d", ctl.selectedSegmentIndex); 
    // Code to change View Controller goes here 
} 

注：這是從內存中寫入未經測試的代碼 - 請相應參考文檔。

Answer 3

注：答案與iOS視圖控制器遏制碼5+包括@接口部分

更新在我的應用程序，我有在導航欄段控制，並單擊視圖控制器「標籤」切換視圖控制器。基本思想是有一個視圖控制器的數組，並使用段索引切換它們（以及indexDidChangeForSegmentedControl IBAction）。

我的應用程序的示例代碼（iOS 5或更高版本）（這是用於2個視圖控制器的，但它很平凡。擴展到多個視圖控制器）;代碼是稍微比爲iOS 4長，但是將保持對象圖完好同時，它採用ARC：

@interface MyViewController() 
// Segmented control to switch view controllers 
@property (weak, nonatomic) IBOutlet UISegmentedControl *switchViewControllers; 

// Array of view controllers to switch between 
@property (nonatomic, copy) NSArray *allViewControllers; 

// Currently selected view controller 
@property (nonatomic, strong) UIViewController *currentViewController; 
@end 

@implementation UpdateScoreViewController 
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib. 
- (void)viewDidLoad { 
    [super viewDidLoad]; 

    // Create the score view controller 
    ViewControllerA *vcA = [self.storyboard instantiateViewControllerWithIdentifier:@"ViewControllerA"]; 

    // Create the penalty view controller 
    ViewControllerB *vcB = [self.storyboard instantiateViewControllerWithIdentifier:@"ViewControllerB"]; 

    // Add A and B view controllers to the array 
    self.allViewControllers = [[NSArray alloc] initWithObjects:vcA, vcB, nil]; 

    // Ensure a view controller is loaded 
    self.switchViewControllers.selectedSegmentIndex = 0; 
    [self cycleFromViewController:self.currentViewController toViewController:[self.allViewControllers objectAtIndex:self.switchViewControllers.selectedSegmentIndex]]; 
} 

#pragma mark - View controller switching and saving 

- (void)cycleFromViewController:(UIViewController*)oldVC toViewController:(UIViewController*)newVC { 

    // Do nothing if we are attempting to swap to the same view controller 
    if (newVC == oldVC) return; 

    // Check the newVC is non-nil otherwise expect a crash: NSInvalidArgumentException 
    if (newVC) { 

     // Set the new view controller frame (in this case to be the size of the available screen bounds) 
     // Calulate any other frame animations here (e.g. for the oldVC) 
     newVC.view.frame = CGRectMake(CGRectGetMinX(self.view.bounds), CGRectGetMinY(self.view.bounds), CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.view.bounds)); 

     // Check the oldVC is non-nil otherwise expect a crash: NSInvalidArgumentException 
     if (oldVC) { 

      // Start both the view controller transitions 
      [oldVC willMoveToParentViewController:nil]; 
      [self addChildViewController:newVC]; 

      // Swap the view controllers 
      // No frame animations in this code but these would go in the animations block 
      [self transitionFromViewController:oldVC 
           toViewController:newVC 
             duration:0.25 
             options:UIViewAnimationOptionLayoutSubviews 
            animations:^{} 
            completion:^(BOOL finished) { 
             // Finish both the view controller transitions 
             [oldVC removeFromParentViewController]; 
             [newVC didMoveToParentViewController:self]; 
             // Store a reference to the current controller 
             self.currentViewController = newVC; 
            }]; 

     } else { 

      // Otherwise we are adding a view controller for the first time 
      // Start the view controller transition 
      [self addChildViewController:newVC]; 

      // Add the new view controller view to the ciew hierarchy 
      [self.view addSubview:newVC.view]; 

      // End the view controller transition 
      [newVC didMoveToParentViewController:self]; 

      // Store a reference to the current controller 
      self.currentViewController = newVC; 
     } 
    } 
} 

- (IBAction)indexDidChangeForSegmentedControl:(UISegmentedControl *)sender { 

    NSUInteger index = sender.selectedSegmentIndex; 

    if (UISegmentedControlNoSegment != index) { 
     UIViewController *incomingViewController = [self.allViewControllers objectAtIndex:index]; 
     [self cycleFromViewController:self.currentViewController toViewController:incomingViewController]; 
    } 

} 
@end 

原始實例（iOS 4的或前）：

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib. 
- (void)viewDidLoad { 
    [super viewDidLoad]; 

    // Create the score view controller 
    AddHandScoreViewController *score = [self.storyboard instantiateViewControllerWithIdentifier:@"AddHandScore"]; 

    // Create the penalty view controller 
    AddHandPenaltyViewController *penalty = [self.storyboard instantiateViewControllerWithIdentifier:@"AddHandPenalty"]; 

    // Add Score and Penalty view controllers to the array 
    self.allViewControllers = [[NSArray alloc] initWithObjects:score, penalty, nil]; 

    // Ensure the Score controller is loaded 
    self.switchViewControllers.selectedSegmentIndex = 0; 
    [self switchToController:[self.allViewControllers objectAtIndex:self.switchViewControllers.selectedSegmentIndex]]; 
} 

#pragma mark - View controller switching and saving 

- (void)switchToController:(UIViewController *)newVC 
{ 
    if (newVC) { 
     // Do nothing if we are in the same controller 
     if (newVC == self.currentViewController) return; 

     // Remove the current controller if we are loaded and shown 
     if([self.currentViewController isViewLoaded]) [self.currentViewController.view removeFromSuperview]; 

     // Resize the new view controller 
     newVC.view.frame = CGRectMake(CGRectGetMinX(self.view.bounds), CGRectGetMinY(self.view.bounds), CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.view.bounds)); 

     // Add the new controller 
     [self.view addSubview:newVC.view]; 

     // Store a reference to the current controller 
     self.currentViewController = newVC; 
    } 
} 

- (IBAction)indexDidChangeForSegmentedControl:(UISegmentedControl *)sender { 

    NSUInteger index = sender.selectedSegmentIndex; 

    if (UISegmentedControlNoSegment != index) { 
     UIViewController *incomingViewController = [self.allViewControllers objectAtIndex:index]; 
     [self switchToController:incomingViewController]; 
    } 

} 

Answer 4

查看此窗格：https://github.com/xmartlabs/XLMailBoxContainer。它使視圖控制器之間的UI動畫。這些視圖控制器可以擴展UITableViewController或任何其他視圖控制器。

我希望這對你有所幫助！