我有一个rootViewController，在它的方法中，我将另外两个对象和它们的视图viewDidLoad初始化为的子视图，然后我先设置。ViewController2*rootViewController.viewViewController2* controller.view.hidden = YES
然后，在 v1 上有一个按钮处理程序，当触摸它时，它会呈现一个 UINavigationController，然后在 v1 上触摸“关闭”按钮调用dismissViewControllerAnimated。
问题是：当dismiss完成时，两个ViewController2*fire viewWillAppear。如何让它只viewWillAppear在可见的那个上开火，而不是在隐藏的那个上开火？
的rootViewController实现：
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.v1 = [[ViewController2 alloc] init];
self.v1.title = @"v1";
[self.view addSubview:self.v1.view];
self.v1.view.hidden = YES;
self.v2 = [[ViewController2 alloc] init];
self.v2.title = @"v2";
[self.view addSubview:self.v2.view];
UIButton * btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setTitle:@"POP" forState:UIControlStateNormal];
[btn sizeToFit];
[btn addTarget:self action:@selector(touchHandler:) forControlEvents:UIControlEventTouchDown];
[self.view addSubview:btn];
}
- (void)touchHandler:(id)sender {
UINavigationController * nc= [[UINavigationController alloc] initWithRootViewController:[[UIViewController alloc] initWithNibName:nil bundle:nil]];
((UIViewController *)[nc.viewControllers objectAtIndex:0]).navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"dismiss" style:UIBarButtonItemStyleBordered target:self action:@selector(dismissHandler:)];
[self presentViewController:nc animated:YES completion:nil];
}
- (void) dismissHandler:(id)sender
{
[self dismissViewControllerAnimated:YES completion:nil];
}
@end
视图控制器2：
@implementation ViewController2
- (void)viewWillAppear:(BOOL)animated
{
NSLog(@"%@",self.title);
}
@end