編輯時無法正常工作時滾動視圖

Question

我想在用戶開始編輯UITextField並且文本字段被鍵盤隱藏時進行UIScrollView滾動。我正在使用來自以下線程的示例。

How to make a UITextField move up when keyboard is present

我有我的四個視UITextFields。當第一次顯示鍵盤時，視圖不會自動滾動。如果我用顯示的鍵盤單擊另一個文本字段，則UIScrollView按照預期滾動。 隱藏鍵盤（通過點擊「完成」按鈕）並再次輕敲UITextField會出現同樣的問題：UIScrollView首先不滾動，但當焦點轉換到另一個文本字段時，它完全滾動。

任何人都可以幫我嗎？

在viewDidLoad我設置的滾動視圖

keyboardIsShown = NO; 
CGSize scrollContentSize = CGSizeMake(320, 350); 
self.scrollView.contentSize = scrollContentSize; 

我爲鍵盤通知登錄尺寸在viewWillAppear

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:self.view.window]; 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:self.view.window]; 

然後我註銷在viewWillDisappear

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil]; 
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil]; 

下面的兩個方法由通知調用離子。

- (void)keyboardWillShow:(NSNotification *)n { 
    if (keyboardIsShown) { 
     return; 
    } 

    NSDictionary *userInfo = [n userInfo]; 

    NSValue *boundsValue = [userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey]; 
    CGSize keyboardSize = [boundsValue CGRectValue].size; 

    CGRect viewFrame = self.scrollView.frame; 
    viewFrame.size.height -= (keyboardSize.height - 50); 

    [UIView beginAnimations:nil context:NULL]; 
    [UIView setAnimationBeginsFromCurrentState:YES]; 

    [UIView setAnimationDuration:0.3]; 
    [self.scrollView setFrame:viewFrame]; 
    [UIView commitAnimations]; 

    keyboardIsShown = YES; 
} 

- (void)keyboardWillHide:(NSNotification *)n { 
    NSDictionary *userInfo = [n userInfo]; 

    NSValue *boundsValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey]; 
    CGSize keyboardSize = [boundsValue CGRectValue].size; 

    CGRect viewFrame = self.scrollView.frame; 
    viewFrame.size.height += (keyboardSize.height - 50); 

    [UIView beginAnimations:nil context:NULL]; 
    [UIView setAnimationBeginsFromCurrentState:YES]; 

    [UIView setAnimationDuration:0.3]; 
    [self.scrollView setFrame:viewFrame]; 
    [UIView commitAnimations]; 

    keyboardIsShown = NO; 
} 

Answer 1

如果您想在鍵盤可見時顯示textfeild，請使用下面的代碼。不要跟隨滾動視圖。如果強制使用scrollView，則忽略此答案。

#define kOFFSET_FOR_KEYBOARD 280.0 

- (void)keyboardWillHide:(NSNotification *)notif { 
    [self setViewMoveUp:NO]; 
} 


- (void)keyboardWillShow:(NSNotification *)notif{ 
    [self setViewMoveUp:YES]; 
} 


- (void)textFieldDidBeginEditing:(UITextField *)textField { 
    stayup = YES; 
    [self setViewMoveUp:YES]; 
} 


- (void)textFieldDidEndEditing:(UITextField *)textField { 
    stayup = NO; 
    [self setViewMoveUp:NO]; 
} 

//method to move the view up/down whenever the keyboard is shown/dismissed 
-(void)setViewMoveUp:(BOOL)moveUp 
{ 
    [UIView beginAnimations:nil context:NULL]; 
    [UIView setAnimationDuration:0.3]; // if you want to slide up the view 
    [UIView setAnimationBeginsFromCurrentState:YES]; 

    CGRect rect = self.view.frame; 
    if (moveUp) 
    { 
     // 1. move the view's origin up so that the text field that will be hidden come above the keyboard 
     // 2. increase the size of the view so that the area behind the keyboard is covered up. 

     if (rect.origin.y == 0) { 
      rect.origin.y -= kOFFSET_FOR_KEYBOARD; 
      //rect.size.height += kOFFSET_FOR_KEYBOARD; 
     } 

    } 
    else 
    { 
     if (stayup == NO) { 
      rect.origin.y += kOFFSET_FOR_KEYBOARD; 
      //rect.size.height -= kOFFSET_FOR_KEYBOARD; 
     } 
    } 
    self.view.frame = rect; 
    [UIView commitAnimations]; 
} 

試試這種方法。根據您的要求編輯它。