無法在2視圖控制器與分段控件之間切換

我在UIViewController的導航欄中以編程方式創建了UISegmentedControl，我希望能夠在切換分段控件時切換視圖控制器。無法在2視圖控制器與分段控件之間切換

這是我到目前爲止有：

@interface TVExploreViewController : TVViewController 

    @property (nonatomic, strong) UISegmentedControl *scopeControl; 
    @property (nonatomic, assign) NSInteger scope; 
    @property (nonatomic, strong) UIViewController *premiumContentViewController; 
    @property (nonatomic, strong) UIViewController *trendingContentViewController; 
    @property (nonatomic, strong) UIViewController *currentViewController; 

@end

TVExploreViewController的實現：

- (void)viewDidLoad { 
     [super viewDidLoad]; 
     _scopeControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"TV & MOVIES", @"VIRAL CLIPS", nil]]; 
     [_scopeControl setFrame:CGRectMake(80, 0, 200, 30)]; 
     [_scopeControl addTarget:self 
        action:@selector(scopeChanged:) 
        forControlEvents:UIControlEventValueChanged]; 
     [[self navigationItem] setTitleView:_scopeControl]; 
     [_scopeControl setSelectedSegmentIndex:0]; 

     _premiumContentViewController = [[TVPremiumContentViewController alloc] init]; 
     _trendingContentViewController = [[TVTrendingFeedController alloc] init]; 
     [self setScope:0]; 
} 

- (void)scopeChanged:(id)sender { 
    [self setScope:self.scopeControl.selectedSegmentIndex]; 
} 

- (void)transitionToViewController:(UIViewController *)controller 
{ 
    [self.currentViewController willMoveToParentViewController:nil]; 
    if (controller) { 
     [self addChildViewController:controller]; 
    } 

    controller.view.frame = self.view.bounds; 
    [self.view addSubview:controller.view]; 
    [self.currentViewController.view removeFromSuperview]; 
    [self.currentViewController removeFromParentViewController]; 
    [controller didMoveToParentViewController:self]; 
    self.currentViewController = controller; 
} 

- (void)setScope:(NSInteger)scope { 
    if (scope != _scope) { 
     _scope = scope; 
     UIViewController *nextController = nil; 

     if (_scope == 0) { 
      nextController = self.premiumContentViewController; 
     } else if (_scope == 1) { 
      nextController = self.trendingContentViewController; 
     } 
     [self transitionToViewController:nextController]; 
    } 
}

當我切換在TVExploreViewController分段控制，視圖的其餘部分保持白色，並沒有視圖控制器加載。任何人都知道我在做什麼錯了？

來源

2014-01-22 thisiscrazy4

當用戶更改分段控件中選定的段時，應該調用哪些代碼？您需要將IBAction連接到UIControlEventValueChanged事件以用於分段控件，並且您根本沒有顯示任何IBAction代碼。 –

我有這個在viewDidLoad中：'[_scopeControl addTarget：自行動：@選擇（scopeChanged :) forControlEvents：UIControlEventValueChanged]' – thisiscrazy4

@DuncanC你沒有使用Interface Builder創建控件... – John

這不是答案，但在這裏寫一些日誌代碼很方便。

你能告訴我方法中的日誌嗎？

- (void)transitionToViewController:(UIViewController *)controller 
{ 
    [self.currentViewController willMoveToParentViewController:nil]; 
    if (controller) { 
     [self addChildViewController:controller]; 
    } 

    controller.view.frame = self.view.bounds; 
    [self.view addSubview:controller.view]; 
    [self.currentViewController.view removeFromSuperview]; 
    [self.currentViewController removeFromParentViewController]; 
    [controller didMoveToParentViewController:self]; 
    self.currentViewController = controller; 

    // can you show me the log here ? 
    NSLog(@"%@, %@, %@", controller.view, controller.view.superview, self.view) ; 
    // you should see the subviews that you added. 
    NSLog(@"subviews:%@", [controller.view subviews]) ; 
}

來源

2014-01-22 02:27:52 KudoCC

>，>，> – thisiscrazy4

@ thisiscrazy4 controller.view被添加到層次結構中。看來問題出在TVTrendingFeedController或TVTrendingFeedController。 – KudoCC

任何想法可能是什麼問題？如果我單獨加載它們，它們似乎工作正常。 – thisiscrazy4

將Viewcontroller添加到ViewController真的不是一個好主意，你應該總是在屏幕上有一個ViewController。您可以使用NavigationController通過不帶動畫進行推送。

來源

2014-01-22 07:56:32

無法在2視圖控制器與分段控件之間切換

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