Objective c 当键盘显示时，如何在选项卡视图中滚动？
我有一个Objective c 当键盘显示时，如何在选项卡视图中滚动？,objective-c,uiscrollview,tableview,Objective C,Uiscrollview,Tableview,我有一个滚动视图，其中有表格视图。我设置当键盘出现时，键盘上方的内容应该移动，这样键盘就不会遮挡任何东西。仅当键盘向上时，如何滚动键盘上方的内容？当键盘向上和向下时，您需要管理UITableView的高度。通知将有助于管理键盘是否打开的状态。根据状态，我们可以预测UITableView的高度 -(void) keyboardWillShow:(NSNotification *)note{ // get keyboard size and loctaion CGRect keyb
滚动视图表格视图 -(void) keyboardWillShow:(NSNotification *)note{
// get keyboard size and loctaion
CGRect keyboardBounds;
[[note.userInfo valueForKey:UIKeyboardFrameEndUserInfoKey] getValue: &keyboardBounds];
NSNumber *duration = [note.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
NSNumber *curve = [note.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey];
// Need to translate the bounds to account for rotation.
keyboardBounds = [self.view convertRect:keyboardBounds toView:nil];
// animations settings
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:[duration doubleValue]];
[UIView setAnimationCurve:[curve intValue]];
// set views with new info
_containerBottom.constant = keyboardBounds.size.height;
CGRect rectTable = _tblMessages.frame;
rectTable.size.height -= keyboardBounds.size.height;
_tblMessages.frame = rectTable;
[self.view layoutIfNeeded];
[self scrollToBottom];
// commit animations
[UIView commitAnimations];
}
-(void) keyboardWillHide:(NSNotification *)note{
CGRect keyboardBounds;
[[note.userInfo valueForKey:UIKeyboardFrameEndUserInfoKey] getValue: &keyboardBounds];
keyboardBounds = [self.view convertRect:keyboardBounds toView:nil];
NSNumber *duration = [note.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
NSNumber *curve = [note.userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey];
// animations settings
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:[duration doubleValue]];
[UIView setAnimationCurve:[curve intValue]];
CGRect rectTable = _tblMessages.frame;
rectTable.size.height += keyboardBounds.size.height;
_tblMessages.frame = rectTable;
// commit animations
[UIView commitAnimations];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
// register for keyboard notifications
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
// unregister for keyboard notifications while not visible.
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillHideNotification
object:nil];
}
您可以添加观察者来检查键盘是否显示
NotificationCenter.default.addObserver(self,
selector: #selector(viewController.keyboardWillShow(notification:)),
name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self,
selector: #selector(viewController.keyboardWillHide(notification:)),
name: NSNotification.Name.UIKeyboardWillHide, object: nil)
func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo? [UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
print("Show")
}
}
func keyboardWillHide(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
print("Hide")
}
}