鍵盤有時會阻止UITextView

在我的應用程序中，我有一個UITextView，它位於屏幕的底部。所以我做的是下面的代碼，但問題是，有時如果單擊UITextView的文本位於鍵盤下方，它將正確滾動到鍵盤上方。鍵盤有時會阻止UITextView

這裏是我註冊NSNotifications：（在viewDidLoad中）

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

[[NSNotificationCenter defaultCenter] addObserver:self 
             selector:@selector(keyboardWasHidden:) 
              name:UIKeyboardWillHideNotification object:nil];

的方法：

-(void)keyboardWasShown:(NSNotification*)aNotification { 
    NSDictionary *info = [aNotification userInfo]; 

    // Get the size of the keyboard. 
    NSValue *aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey]; 
    keyboardSize = [aValue CGRectValue].size; 

    // Resize the scroll view (which is the root view of the window) 
    CGRect viewFrame = [textView frame]; 

    viewFrame.size.height -= keyboardSize.height; 

    textView.frame = viewFrame; 

    // Scroll the active text field into view. 
    //CGRect textFieldRect = [activeField frame]; 
    [textView scrollRectToVisible:viewFrame animated:YES]; 
} 

-(void)keyboardWasHidden:(NSNotification*)aNotification { 
    // Reset the height of the scroll view to its original value 
    CGRect viewFrame = [textView frame]; 
    viewFrame.size.height += keyboardSize.height; 
    textView.frame = viewFrame; 
}

我如何註銷NSNotifications：在ViewDidUnload：

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

有沒有人看到任何錯誤？

謝謝！

來源

2012-03-04 iBrad Apps

如果只是有時不會發生滾動，請檢查您的框架計算和移動。它可能會出錯。 – cocoakomali 2012-03-04 03:49:13

我應該怎麼發佈NSLog，因爲所有這些值都很混亂。當我發佈這些值時，也許別人會看到我的問題。 – 2012-03-04 04:22:54

您應該打印原始視圖框架，鍵盤大小和最終修改後的視圖框架。 – cocoakomali 2012-03-09 18:23:39

這裏是我用來移動textview的代碼，所以我可以在KB顯示時看到它。我的觀點已經在scrollview中了。

-(void)textViewDidBeginEditing:(UITextView *)textView { //Keyboard becomes visible 

    //perform actions. 
    NSLog(@"IN VIEW"); 
    [self scrollTheViewToTop:self.scroller forTheTextView:textView]; 
} 
- (void)textViewDidEndEditing:(UITextView *)textView { 
    [self.scroller setContentOffset:CGPointZero animated:YES]; 
} 
- (void)scrollTheViewToTop:(UIScrollView *)scrollView forTheTextView:(UITextView *)textView { 

    //Scroll the ScrollView Up tp show the Continue button in the bottom is visible. 

    CGPoint pt; 
    CGRect rc = [textView bounds]; 
    rc = [textView convertRect:rc toView:scrollView]; 
    pt = rc.origin; 
    pt.x = 0; 
    pt.y -= 60; 
    [scrollView setContentOffset:pt animated:YES]; 
}

來源

2014-06-25 14:38:38 rara

鍵盤有時會阻止UITextView

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