如何從另一個類訪問UISplitViewController中的自定義UIViewController

Question

我在UISplitViewController中有一個自定義的customUIViewController，並想從另一個類的detailView（這是UISplitViewController中的另一個UIViewController）訪問customUiViewController的實例;我怎樣才能做到這一點？

CODE SNIP（別擔心有關語法;它是縮短了）

myAppDelegate.m

customViewController *masterView = [[customViewController alloc] init; 
UINavigationController *NVC = [[UINavigationController alloc] initWithRootViewController:masterView]; 

MYViewController *detailView = [[MyViewController alloc] init; 

UISplitViewController *mySplit = [...]; 

mySplit.viewControllers = NSArray[...masterview,detailView,nil]; 

[window addSubView:mySplit view]; 

MyViewController.m

-(void) someMethod { 
     customViewController *myInstance = (customViewController)[self.splitViewController objectAtIndex:0]; ?? 
// I think this just gets the outter UINavigationController 
     [myInstance doSomething]; 
} 

customViewController.m

-(void) doSomething { 
} 

I希望能夠訪問customViewController來調用doSomething方法。無論customViewController和myViewController相同UISplitViewController

Answer 1

如果你正在使用默認UISplitView工作XCode所做的，你需要引用AppDelegate來獲得splitView的ivar：

YourAppDelegate *del = (YourAppDelegate *)[[UIApplication sharedApplication]delegate]; 
UISplitViewController *split = del.splitViewController; 
NSArray *vcArray = split.viewControllers; 
//left is objectAtIndex:0, right is objectAtIndex:1 

Answer 2

UIViewControllers有splitViewController屬性，因此嘗試使用，要得到一個內部參考：

customViewController *myInstance = 
    (customViewController *)[self.splitViewController.viewControllers 
           objectAtIndex:0]; 

指數0是在拆分視圖控制器左側視圖控制器。

編輯：
如果左側視圖控制器是一個UINavigationController，然後得到的根視圖控制器，這樣做：

UINavigationController *nc = 
    (UINavigationController *)[self.splitViewController.viewControllers 
           objectAtIndex:0]; 

customViewController *myInstance = 
    (customViewController *)[nc.viewControllers objectAtIndex:0];