iPhone - 如何在键盘出现时滚动UITextField并调整UITextView的大小

Question

I have a UIScrollView inside which I have a UITextField and a UITextView. I want to prevent the keyboard to hide the field we are working on. If my user tap on the TextField, I want it to scroll to top of the screen. If my user tap on the TextView, I want it to resize to the empty place left on the top of the keyboard. My keyboard has an accessory view (a toolbar).

For now, I catch the UIKeyboardWillShowNotification notification, and I use this code, that does not really work (the textview is resized, but is still behind the keyboard) : This code worked well when I hadn't the UIScrollView.

- (void)keyboardWillShow:(NSNotification *)notification {

    if ([self.noteView isFirstResponder] == NO) return;

    /*
     Reduce the size of the text view so that it's not obscured by the keyboard.
     Animate the resize so that it's in sync with the appearance of the keyboard.
     */

    NSDictionary *userInfo = [notification userInfo];
    NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];                            // Get the origin of the keyboard when it's displayed.
    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];   // Get the duration of the animation.

    // Get the top of the keyboard as the y coordinate of its origin in self's view's coordinate system. The bottom of the text view's frame should align with the top of the keyboard's final position.
    CGRect keyboardRect = [aValue CGRectValue];
    keyboardRect = [self.view convertRect:keyboardRect fromView:nil];

    CGFloat keyboardTop = keyboardRect.origin.y;
    CGRect newTextViewFrame = self.view.bounds;
    newTextViewFrame.size.height = keyboardTop - self.view.frame.origin.y; // Using bounds here does not help

    NSTimeInterval animationDuration;
    [animationDurationValue getValue:&animationDuration];

    // Animate the resize of the text view's frame in sync with the keyboard's appearance.
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:animationDuration];

     self.noteView.frame = newTextViewFrame;

    [UIView commitAnimations];
}

So could you help me to :

• make this work for the textview ?

• make the Textview go back to its original position ?

• How may I do to scroll the TextField without any resizing feature ?

Thank you

Answer 1

Could you just programmatically scroll the uiscrollview using this:

- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated

Not sure if this will work for your application or not.