objective-c - 如何在 objective-c 中出现键盘时 ScrollView ？

Question

我试过了，但是 View 太小，无法向上滚动。我怎样才能滚动更多？

// 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(keyboardWillBeHidden:)
                                                 name:UIKeyboardWillHideNotification object:nil];

}

// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
scroll.contentInset = contentInsets;
scroll.scrollIndicatorInsets = contentInsets;

// If active text field is hidden by keyboard, scroll it so it's visible
// Your application might not need or want this behavior.
CGRect aRect = self.view.frame;
aRect.size.height -= kbSize.height;
if (!CGRectContainsPoint(aRect, EPostaText.frame.origin) ) {
    CGPoint scrollPoint = CGPointMake(0.0, EPostaText.frame.origin.y-(aRect.size.height));
    [scroll setContentOffset:scrollPoint animated:YES];
}
}

// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
scroll.contentInset = contentInsets;
scroll.scrollIndicatorInsets = contentInsets;
}

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
EPostaText = textField;

}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
EPostaText = nil;
}

Answer 1

最好的方法 - 将 ScrollView 容器调整到可见区域并使用它:

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