分段控制改变时更改视图控制器

Question

这个问题让我疯狂。当用户更改分段控件的选定“选项卡”时，我试图更改viewController。我花了几个小时的时间进行研究，一直未能找到可以通过故事板完成的答案。

它真的很麻烦，因为设置选项卡应用程序非常简单，但试图使用像Tab应用程序一样的分段控件只是不起作用。我已经知道如何检测在分段控制中选择哪个索引。我怎样才能做到这一点？

非常感谢。

Answer 1

我会说这是多少卡如果要在UIViewController内更改子视图，则可以在故事板中设置子视图，并在控制器中将它们与IBOulets挂钩，您可以将视图的hidden属性设置为YES或NO，具体取决于所单击的控件。

现在，如果您使用@Robotic Cat的方法，这也是一个很好的解决方案，您可以在应用程序的工作方式上有更多的模块化，考虑到您必须使用我提供的解决方案将所有逻辑放在一个控制器中。

Answer 2

UISegmentedControl有点不同，它没有委托协议，你必须使用“添加目标”样式。在你的情况下，你想要做的是添加一个目标，当UISegmentedControl改变时（这可能是父视图控制器），然后该目标可以处理标签切换。

例如：

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

在这个例子中，代码被从一些视图/控制器可以访问的变量的分段控制调用。我们添加自己以获取changedSegmentedControl：方法。

那么你就必须像这样一种方法：

- (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：这是从内存中写入未经测试的代码 - 请相应参考文档。

Answer 3

注：答案与iOS视图控制器遏制码5+包括@接口部分

更新在我的应用程序，我有在导航栏段控制，并单击视图控制器“标签”切换视图控制器。基本思想是有一个视图控制器的数组，并使用段索引切换它们（以及indexDidChangeForSegmentedControl IBAction）。

我的应用程序的示例代码（iOS 5或更高版本）（这是用于2个视图控制器的，但它很平凡。扩展到多个视图控制器）;代码是稍微比为iOS 4长，但是将保持对象图完好同时，它采用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 

原始实例（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。它使视图控制器之间的UI动画。这些视图控制器可以扩展UITableViewController或任何其他视图控制器。

我希望这对你有所帮助！