[转]textField键盘显示问题

转自：http://bbs.feng.com/read-htm-tid-589227.html

http://developer.apple.com/iphon ... Web/TextandWeb.html<ignore_js_op>

// Listing 5-1  Handling the keyboard notifications
// Call this method somewhere in your view controller setup code.
- (void)registerForKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWasShown:)
                                                 name:UIKeyboardDidShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWasHidden:)
                                                 name:UIKeyboardDidHideNotification object:nil];
}
// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
    if (keyboardShown)
        return;
    NSDictionary* info = [aNotification userInfo];
    // Get the size of the keyboard.
    NSValue* aValue = [info objectForKey:UIKeyboardBoundsUserInfoKey];
    CGSize keyboardSize = [aValue CGRectValue].size;
    // Resize the scroll view (which is the root view of the window)
    CGRect viewFrame = [scrollView frame];
    viewFrame.size.height -= keyboardSize.height;
    scrollView.frame = viewFrame;
    // Scroll the active text field into view.
    CGRect textFieldRect = [activeField frame];
    [scrollView scrollRectToVisible:textFieldRect animated:YES];
    keyboardShown = YES;
}
// Called when the UIKeyboardDidHideNotification is sent
- (void)keyboardWasHidden:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    // Get the size of the keyboard.
    NSValue* aValue = [info objectForKey:UIKeyboardBoundsUserInfoKey];
    CGSize keyboardSize = [aValue CGRectValue].size;
    // Reset the height of the scroll view to its original value
    CGRect viewFrame = [scrollView frame];
    viewFrame.size.height += keyboardSize.height;
    scrollView.frame = viewFrame;
    keyboardShown = NO;
}