如何从另一个类访问UISplitViewController中的自定义UIViewController

Question

我在UISplitViewController中有一个自定义的customUIViewController，并想从另一个类的detailView（这是UISplitViewController中的另一个UIViewController）访问customUiViewController的实例;我怎样才能做到这一点？

CODE SNIP（别担心有关语法;它是缩短了）

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希望能够访问customViewController来调用doSomething方法。无论customViewController和myViewController相同UISplitViewController

Answer 1

如果你正在使用默认UISplitView工作XCode所做的，你需要引用AppDelegate来获得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属性，因此尝试使用，要得到一个内部参考：

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

指数0是在拆分视图控制器左侧视图控制器。

编辑：
如果左侧视图控制器是一个UINavigationController，然后得到的根视图控制器，这样做：

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

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