iphone - 在 ios 中管理键盘以获取文本字段的数量

Question

对我来说一切都很好，除了一个案例。当我开始编辑文本字段时，显示键盘：方法被调用，但如果我编辑下一个文本字段而不退出第一个，则不会调用此方法。

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

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

}


     -(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);
      testScroll.contentInset = contentInsets;
     testScroll.scrollIndicatorInsets = contentInsets;
       CGRect aRect = self.view.bounds;

      CGPoint activepoint= [active.superview convertPoint:active.frame.origin toView:nil];
    if (!CGRectContainsPoint(aRect, activepoint) ) {
        CGPoint scrollPoint = CGPointMake(0.0, active.frame.origin.y+active.frame.size.height-kbSize.height+100);// here active is my particular textfields and i an changing it in begin editing method.
        [testScroll setContentOffset:scrollPoint animated:YES];
    }

这里我的问题是即使我在两个文本字段之间切换，我的滚动视图必须为特定的偏移量设置。

谢谢你。