当cell中有UItextfiled或者UITextVIew时，弹出键盘把tableview往上,但是有的cell没有移动

cell中有UITextView时,输入文字是需要将tableView向上移,基本的做法是,注册键盘变化的通知在通知的方法中做tableVIew的位置调整,

一,一般做法

- (void)registerForKeyboardNotifications {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillBeHidden:) name:UIKeyboardWillHideNotification object:nil];
    NSLog(@"register");
}

- (void)keyboardWasShown:(NSNotification *)aNotification {
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    ///将内边距进行调整
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
}

- (void)keyboardWillBeHidden:(NSNotification *)aNotification {

UIEdgeInsets contentInsets = UIEdgeInsetsZero;
}
今天做项目发现以上方法有一定缺陷,当tableView有多组的时候,有一组cell不跟着向上移动照成如下情况:

当键盘出现时,尾视图向上移动了但是这一组中的cell没有向上移动,这是什么原因,我至今没有搞清楚.

上述方法还会出现问题

解决办法找到了就是在键盘出现的通知方法中找到第一响应者(一般是:UITextField),判断它所在的cell是否显示在可见区域,如果没有则让tableVIew滑动至该cell全部可见:

#pragma mark 键盘出现

-(void)keyboardWillShow:(NSNotification *)note

{

CGRect keyBoardRect=[note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];

//取得第一响应者

UIWindow * keyWindow = [[UIApplication sharedApplication] keyWindow];

UIView *activeField = [keyWindow performSelector:@selector(firstResponder)];

//使用了苹果的私有方法,将无法上传到App Store,下一篇介绍不使用该方法获取第一响应者

//除去键盘后的页面显示区域

CGRect aRect = self.view.frame;

aRect.size.height =  aRect.size.height - keyBoardRect.size.height - 64;

///修改arect:

CGRect tableReact = self.tableView.frame;

float y = _tableView.contentOffset.y;

tableReact.origin.y += y;

tableReact.size.height -= keyBoardRect.size.height;

aRect = tableReact;

//判断cell底部是否在显示范围内

CGPoint cellBottomPoint = CGPointMake(0.0, activeField.superview.superview.frame.origin.y +activeField.superview.superview.frame.size.height);

if (!CGRectContainsPoint(aRect, cellBottomPoint) ) {

self.tableView.contentInset = UIEdgeInsetsMake(0, 0, keyBoardRect.size.height, 0);

CGPoint scrollPoint = CGPointMake(0.0, cellBottomPoint.y-aRect.size.height -44);

[_tableView setContentOffset:scrollPoint animated:YES];

}

}

#pragma mark 键盘消失

-(void)keyboardWillHide:(NSNotification *)note

{

[UIView animateWithDuration:.35 animations:^{

self.tableView.contentInset = UIEdgeInsetsMake(0, 0, 45, 0);

}];

}

这样就完美解决了以上问题;