移動鍵盤的視圖，然後按住home鍵，返回以查看未轉換視圖中的結果？

Question

我使用下面的atm代碼。只要你沒有退出應用程序（按回家）鍵盤啓動，它工作正常。所以我認爲，簡單，只是resignFirstResponder在viewWillDissappear :(BOOL）動畫，但不會被稱爲明顯按下家...

因此，快速回顧一下問題場景： 點擊textView - >鍵盤出現，觀點再次轉移 按家庭 打開應用程序 - >鍵盤仍然上漲，看法是背它在哪裏，所以內容不可見

- (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

您可以添加通知進入後臺事件，如下面的代碼

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

而且在功能

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