保持從鍵盤下面的內容

Question

我得到了一個UIViewController，我有一個UIScrollView裏面有幾個UITextFields。我從蘋果那裏得到了一段代碼，似乎是從鍵盤下面移動內容。

- (void)keyboardWasShown:(NSNotification *)notification 
{ 
    // Step 1: Get the size of the keyboard. 
    CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size; 
    // Step 2: Adjust the bottom content inset of your scroll view by the keyboard height. 
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height, 0.0); 
    self.scrollView.contentInset = contentInsets; 
    self.scrollView.scrollIndicatorInsets = contentInsets; 
    // Step 3: Scroll the target text field into view. 
    CGRect aRect = self.view.frame; 
    aRect.size.height -= keyboardSize.height; 
    if (!CGRectContainsPoint(aRect, self.firstResponder.frame.origin)) { 
     CGPoint scrollPoint = CGPointMake(0.0, self.firstResponder.frame.origin.y - (keyboardSize.height-10)); 
     [self.scrollView setContentOffset:scrollPoint animated:YES]; 
    } 
} 

我的UIScrollView是320x416，因爲我有一個導航欄。此外，我的鍵盤獲得44個像素，因爲我正在添加一個UIToolBar，所以代碼並不真正起作用。我嘗試了各種配置來解決兩個問題：

1. 最後兩個字段被UIToolBar +鍵盤覆蓋，但只有最後一個字段觸發UIScrollView移動。
2. 除了UIScrollView在移動，由於UIToolBar，UITextField仍然在鍵盤後面。

UPDATE：這工作，但我敢肯定是錯誤的，如果是正確的，我不知道爲什麼，沒有對我來說很有意義。有人可以修復/解釋它嗎？

- (void)keyboardWasShown:(NSNotification *)notification 
{ 
    // Step 1: Get the size of the keyboard. 
    CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size; 
    // Step 2: Adjust the bottom content inset of your scroll view by the keyboard height. 
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height + 44.0f, 0.0); 
    self.scrollView.contentInset = contentInsets; 
    self.scrollView.scrollIndicatorInsets = contentInsets; 
    // Step 3: Scroll the target text field into view. 
    CGRect aRect = self.view.frame; 
    aRect.size.height -= keyboardSize.height + 44.0f; 
    if (!CGRectContainsPoint(aRect, self.firstResponder.frame.origin)) { 
     CGPoint scrollPoint = CGPointMake(0.0, self.firstResponder.frame.origin.y - (keyboardSize.height-10.0f - 44.0f - 44.0f - 44.0f)); 
     [self.scrollView setContentOffset:scrollPoint animated:YES]; 
    } 
} 

UPDATE1：還有一個錯誤，我在UIToolBar先前的按鈕，如果我點擊最後一個文本框，滾動視圖上升，如果我搬回到第一文本視圖，它在視圖之外，因爲滾動視圖不會滾動。

Answer 1

嘗試了很多解決蘋果的解決方案我結束了這個問題寫一些代碼自己後在描繪蘋果代碼背後的一般想法之後。順便說一下，我認爲蘋果代碼會使問題複雜化，並且不會真正起作用。

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

    self.firstResponder = textField; 

    if (self.firstResponder.frame.origin.y + self.firstResponder.frame.size.height > self.view.bounds.size.height - (216 + 44)) { 

     double fix = (self.firstResponder.frame.origin.y + self.firstResponder.frame.size.height) - (self.view.bounds.size.height - (216 + 44)) + 10; 

     CGRect rect = CGRectMake(0, -fix, self.view.frame.size.width, self.view.frame.size.height); 

     [UIView beginAnimations:nil context:NULL]; 
     [UIView setAnimationDuration:0.3]; 
     self.view.frame = rect; 
     [UIView commitAnimations]; 

    } else if (self.firstResponder.frame.origin.y + 10 < -self.view.frame.origin.y) { 

     double fix = -self.view.frame.origin.y - (-self.view.frame.origin.y - self.firstResponder.frame.origin.y) - 10; 

     CGRect rect = CGRectMake(0, -fix, self.view.frame.size.width, self.view.frame.size.height); 

     [UIView beginAnimations:nil context:NULL]; 
     [UIView setAnimationDuration:0.3]; 
     self.view.frame = rect; 
     [UIView commitAnimations]; 

    } 

} 

Answer 2

嘗試添加工具欄的高度以及測算，

UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height + 44.0f, 0.0); 

而且使，

aRect.size.height = aRect.size.height - keyboardSize.height - 44.0f; 

Answer 3

我都試過，你有同樣的方法在編輯區域，但做了細微的變化的，如果條件：

!CGRectContainsRect(aRect, self.firstResponder.frame) 

這可以幫助你解決問題，即只有原點是鍵盤上方，但是文本區域被覆蓋。