iOS - 鍵盤上的UIScroll在文本框位於子視圖內時彈出到文本框

Question

當鍵盤覆蓋文本框時，我使用代碼使屏幕滾動。

我有一個文本框的列表，我開始把每個內部的自己的uiview用於樣式和組織目的。

現在我的代碼只適用於當我開始實際輸入文本字段。這是我從蘋果複製的怪物。注：我加一個參數 registerForKeyboardNotifications，這樣我可以包括這在父類和從任何地方

// Call this method somewhere in your view controller setup code. 
- (void)registerForKeyboardNotifications:(UIScrollView *)scroll 
{ 
    _scroller = scroll; 

    [[NSNotificationCenter defaultCenter] addObserver:self 
              selector:@selector(keyboardWasShown:) 
               name:UIKeyboardDidShowNotification object:nil]; 
    [[NSNotificationCenter defaultCenter] addObserver:self 
              selector:@selector(keyboardWillBeHidden:) 
               name:UIKeyboardWillHideNotification object:nil]; 
} 

// Called when the UIKeyboardDidShowNotification is sent. 
- (void)keyboardWasShown:(NSNotification*)aNotification 
{ 
    NSLog(@"hey"); 
    NSDictionary* info = [aNotification userInfo]; 
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size; 
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0); 
    _scroller.contentInset = contentInsets; 
    _scroller.scrollIndicatorInsets = contentInsets; 

    // If active text field is hidden by keyboard, scroll it so it's visible 
    // Your application might not need or want this behavior. 
    CGRect aRect = self.view.frame; 
    aRect.size.height -= kbSize.height; 
    if (!CGRectContainsPoint(aRect, _activeField.frame.origin)) { 
     CGPoint scrollPoint = CGPointMake(0.0, _activeField.frame.origin.y-kbSize.height); 
     [_scroller setContentOffset:scrollPoint animated:YES]; 
    } 
} 

// Called when the UIKeyboardWillHideNotification is sent 
- (void)keyboardWillBeHidden:(NSNotification*)aNotification 
{ 
    UIEdgeInsets contentInsets = UIEdgeInsetsZero; 
    _scroller.contentInset = contentInsets; 
    _scroller.scrollIndicatorInsets = contentInsets; 
} 

- (void)textFieldDidBeginEditing:(UITextField *)textField{ 

    _activeField = textField; 
} 

- (void)textFieldDidEndEditing:(UITextField *)textField 
{ 
    _activeField = nil; 
} 

我在視圖 - 控制

for (id subView in _tpnScroll.subviews) 
{ 

    if ([subView isKindOfClass:[UIView class]]) { 
     UIView *thisView = subView; 
     for(id textfield in thisView.subviews){ 
      if([textfield isKindOfClass:[UITextField class]]){ 
       [textfield setDelegate:self]; 
      } 
     } 
    } 
} 

縮小問題這部分稱之爲原始代碼是

for (id subView in _tpnScroll.subviews){ 
    if ([subView isKindOfClass:[UITextField class]]) { 
     [subView setDelegate:self]; 
    } 
} 

在第一個例子中。我循環通過我的UIViews，並找到UITextfields，並設置委託給自己（這部分我不完全理解，仍試圖理解委託的概念）

在第二個示例中，文本字段位於直接在scrollview上，所以我直接通過它們循環。

對不起，如果這是羅嗦。

Answer 1

嘗試用此代替keyboardWasShown。

- (void)keyboardWasShown:(NSNotification*)aNotification 
{ 
    NSLog(@"hey"); 
    NSDictionary* info = [aNotification userInfo]; 
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size; 
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0); 
    _scroller.contentInset = contentInsets; 
    _scroller.scrollIndicatorInsets = contentInsets; 

    // the scroll view will only scroll if the text field is not fully visible 
    // no need to check if it is actually covered 
    [_scroller scrollRectToVisible:[_scroller convertRect:_activeField.bounds fromView:_activeField] 
         animated:YES]; 
} 

轉換文本字段的邊界滾動視圖的座標系統可以確保它的工作原理，如果文本字段，即使它不是直接在它裏面滾動視圖內。