iOS中在tableview上通知控制键盘弹起界面上推的方法

最新推荐文章于 2021-06-08 20:48:54 发布

ghqiang112358

最新推荐文章于 2021-06-08 20:48:54 发布

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分类专栏： iOS 关于UI 文章标签：界面 app ios uitableview uitableviewcell

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本文介绍如何使用iOS的通知中心来监听键盘的显示和隐藏事件，并调整布局以适配键盘的弹出与收起。此外，还实现了当tableView滚动时自动收起键盘的功能。

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上代码：

//注册通知

-(void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(openKeyboard:) name:UIKeyboardWillShowNotification object:nil];

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

}

//注销通知

-(void)viewDidDisAppear:(BOOL)animated{

[super viewDidDisappear:animated];

[[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardWillShowNotification object:nil];

[[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardWillHideNotification object:nil];

}

//键盘上弹

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

CGRect keyboardFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey]CGRectValue];

NSTimeInterval duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey]doubleValue];

UIViewAnimationOptions option = [notification.userInfo [UIKeyboardAnimationCurveUserInfoKey]intValue];

// self.BottomLayoutConstaint.constant 这个是storyboard里面tableview的下沿，直接拉线的，而keyboardFrame.size.height是键盘的高度

self.BottomLayoutConstaint.constant = keyboardFrame.size.height+99*SizeScaleY;

[UIView animateWithDuration:duration delay:0 options:option animations:^{

[self.view layoutIfNeeded];

} completion:nil];

}

//恢复键盘

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

self.BottomLayoutConstaint.constant = 0;

NSTimeInterval duration = [notification.userInfo[UIKeyboardAnimationDurationUserInfoKey]doubleValue];

UIViewAnimationOptions option = [notification.userInfo [UIKeyboardAnimationCurveUserInfoKey]intValue];

[UIView animateWithDuration:duration delay:0 options:option animations:^{

[self.view layoutIfNeeded];

} completion:nil];

}

//tableView滚动的时候自动收回键盘

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView

{

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

}

如上面设置就可以实现键盘的上弹和收回了，当然要灵活运用。