iphone - 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，并且想要从另一个类的detailView(它是UISplitViewController内的另一个UIViewController)访问customUiViewController的实例；我该怎么做？

代码片段(不用担心语法；它已缩短)

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];
 }

自定义ViewController.m

-(void) doSomething {
}

我希望能够访问 customViewController 来调用 doSomething 方法。 customViewController 和 myViewController 都在同一个 UISplitViewController 内

Answer 1

UIViewController 有 splitViewController 属性，因此请尝试使用它来获取引用:

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

索引 0 是分割 View Controller 中的左侧 View Controller 。

编辑:
如果左侧 View Controller 是 UINavigationController，则要获取其 Root View Controller ，请执行以下操作:

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

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