ios - cocoa : Can't remove child view controller

Question

我加载主视图 Controller 的 View 。这个主视图 Controller 然后添加 2 个 subview Controller ( Split View:主视图和细节 View )。当我在 init 方法中添加子 VC 后立即记录它们的数量时，我得到“2”作为输出。然后，当我调用 -switchToCommunication 方法并尝试删除详细信息子 VC 时， View 不会改变。但是日志告诉我数组实际上已经从 2 个子 VC 缩减到 1 个。

怎么了？

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
[super init];

//add master view controller as childVC
self.test2 = [test2 new];
[self addChildViewController:self.test2];
self.test2.view.frame = CGRectMake(0, 0, 256, 768);
[self.view addSubview:self.test2.view];
[self.test2 didMoveToParentViewController:self];

//add detail view controller as childVC 
self.detail1Vc = [EADetailSupportViewController new];
[self addChildViewController: self.detail1Vc];
self.detail1Vc.view.frame = CGRectMake(284, 0, 740, 768);
[self.view addSubview: self.detail1Vc.view];
[self.detail1Vc didMoveToParentViewController:self];
NSLog(@"Child VC in childVC array: %d", [self.childViewControllers count]);



- (void) switchToCommunication {
//remove currently active detail view controller from parent view
NSLog(@"Child VC in childVC array: %d", [self.childViewControllers count]);


[[self.childViewControllers lastObject] willMoveToParentViewController:nil];
[[[self.childViewControllers lastObject] view] removeFromSuperview];
[[self.childViewControllers lastObject] removeFromParentViewController];

NSLog(@"Child VC in childVC array: %d", [self.childViewControllers count]);

NSLog(@"pushed");

//add communication detail view controller as child view controller
...
}

Answer 1

此代码可以帮助您删除 subview ，对我来说效果很好。self.childViewController 是一个数组，因此您可以从特定索引中删除。

  [[self.childViewControllers objectAtIndex:0] removeFromParentViewController];