ios - 移动键盘的视图，然后按主页，返回视图会导致非移动视图？

Question

我使用 atm 下面的代码。只要您在键盘启动时不退出应用程序（按主页），它就可以正常工作。所以我想，简单，只是在 viewWillDissappear:(BOOL)animated 中 resignFirstResponder ，但这显然不会被称为按 home ......

快速回顾一下问题场景：点击 textView -> 键盘出现，视图被转移 按 home 再次打开应用程序 -> 键盘仍然打开，视图回到原来的位置，所以内容不可见

 - (void)viewDidLoad
    {
        [super viewDidLoad];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    }

- (void) keyboardWillShow: (NSNotification*) aNotification;
    {       
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.3];
        CGRect rect = [[self view] frame];
        rect.origin.y -= 60; 
        [[self view] setFrame: rect];
        [UIView commitAnimations];
    }

    - (void) keyboardWillHide: (NSNotification*) aNotification;
    {
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.3];
        CGRect rect = [[self view] frame];
        rect.origin.y += 60;
        [[self view] setFrame: rect];
        [UIView commitAnimations];
    }

Answer 1

您可以为进入后台事件添加通知，如以下代码

 - (void)viewDidLoad
{
    //Add this 
    [[NSNotificationCenter defaultCenter] addObserver: self
                                             selector: @selector(handleEnteredBackground:) 
                                                 name: UIApplicationDidEnterBackgroundNotification
                                               object: nil];
}

并且在函数中

- (void) handleEnteredBackground:(NSObject*)obj
{
    //Adjust your views   
}