Question

我在UITableView内有UIViewController。当我开始在UITableView中搜索时，键盘下会显示一些行我应该怎么做才能看到所有这些？需要设置任何layoutIfNeeded（）或什么？
提前致谢，祝你有个美好的一天！

Answer 1

如果您可以直接使用UITableViewController，那么这将是首选方法，因为它可以自动避免键盘。

如果无法做到这一点，您必须自己实施。这样的事情应该有效：

override func viewDidLoad() {
    super.viewDidLoad()

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil)
}

deinit {
    NSNotificationCenter.defaultCenter().removeObserver(self)
}

func keyboardWillShow(notification: NSNotification) {
    let keyboardSize = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue().size
    let rate = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! NSNumber

    var contentInsets = UIEdgeInsetsZero
    if UIInterfaceOrientationIsPortrait(UIApplication.sharedApplication().statusBarOrientation) {
        contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height, 0.0)
    } else {
        contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.width, 0.0)
    }

    UIView.animateWithDuration(rate.doubleValue) {
        self.tableView.contentInset = contentInsets
        self.tableView.scrollIndicatorInsets = contentInsets
    }

    tableView.scrollToRowAtIndexPath(self.editingIndexPath, atScrollPosition: UITableViewScrollPosition.Top, animated: true)

}

func keyboardWillHide(notification: NSNotification) {
    let rate = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! NSNumber

    UIView.animateWithDuration(rate.doubleValue) {
        self.tableView.contentInset = UIEdgeInsetsZero
        self.tableView.scrollIndicatorInsets = UIEdgeInsetsZero
    }
}

我自己从原始的Objective-C代码移植Brandon King：

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];

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

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)keyboardWillShow:(NSNotification *)notification
{    
    CGSize keyboardSize = [notification.userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    NSNumber *rate = notification.userInfo[UIKeyboardAnimationDurationUserInfoKey];

    UIEdgeInsets contentInsets;
    if (UIInterfaceOrientationIsPortrait([[UIApplication sharedApplication] statusBarOrientation])) {
        contentInsets = UIEdgeInsetsMake(0.0, 0.0, (keyboardSize.height), 0.0);
    } else {
        contentInsets = UIEdgeInsetsMake(0.0, 0.0, (keyboardSize.width), 0.0);
    }

    [UIView animateWithDuration:rate.floatValue animations:^{
        self.tableView.contentInset = contentInsets;
        self.tableView.scrollIndicatorInsets = contentInsets;
    }];
    [self.tableView scrollToRowAtIndexPath:self.editingIndexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

- (void)keyboardWillHide:(NSNotification *)notification
{
    NSNumber *rate = notification.userInfo[UIKeyboardAnimationDurationUserInfoKey];
    [UIView animateWithDuration:rate.floatValue animations:^{
        self.tableView.contentInset = UIEdgeInsetsZero;
        self.tableView.scrollIndicatorInsets = UIEdgeInsetsZero;
    }];
}

Answer 2

原作者Steve Wilford - 由我转换为Swift 3

var myIndexPath:IndexPath = IndexPath(row: 0, section: 0)

  override func viewDidLoad() {

    super.viewDidLoad()

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: .UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
  }

deinit {
    NotificationCenter.default.removeObserver(self)
}


func keyboardWillShow(_ notification: NSNotification) {
    let keyboardSize = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue.size
    let rate = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! NSNumber

    var contentInsets = UIEdgeInsets.zero
    if UIInterfaceOrientationIsPortrait(UIApplication.shared.statusBarOrientation) {
        contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height, 0.0)
    } else {
        contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.width, 0.0)
    }

    UIView.animate(withDuration: rate.doubleValue) {
        self.tableView.contentInset = contentInsets
        self.tableView.scrollIndicatorInsets = contentInsets
    }

    tableView.scrollToRow(at: myIndexPath, at: .middle, animated: true)
}

func keyboardWillHide(_ notification: NSNotification){
    let rate = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! NSNumber

    UIView.animate(withDuration: rate.doubleValue) {
        self.tableView.contentInset = UIEdgeInsets.zero
        self.tableView.scrollIndicatorInsets = UIEdgeInsets.zero
    }
}

iOS Swift：UITableView键盘覆盖

2 个答案: