[英]How to move UIView that contain in UIViewController when keyboard appear or dismiss?
我有一個問題是我想在顯示鍵盤時將UIView(footerview)向上移動,而在關閉鍵盤時將其向下移動。
視圖層次結構將如下所示:
視圖:
- >文本字段
-> UIView(FooterView)
編輯 :
發布此問題后,我自己找到了答案
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
return YES;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];
[self.view endEditing:YES];
return YES;
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
[textField resignFirstResponder];
return YES;
}
- (void)keyboardDidShow:(NSNotification *)notification
{
// Assign new frame to view
[self.footerView setFrame:CGRectMake(0,250,320,65)];
}
-(void)keyboardDidHide:(NSNotification *)notification
{
// set it back to the original place
[self.footerView setFrame:CGRectMake(0,503,320,65)];
}
如果使用的是自動布局,則可以為UIView NSLayoutAttributeBottom約束創建一個IBOutlet並在需要時進行更改。 如果不是,則必須移動視圖框架。
例如:
- (void)keyboardWillShow:(NSNotification *)notification {
// Get the size of the keyboard.
CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
self.bottomConstraintKeyboard = [NSLayoutConstraint constraintWithItem:self.view attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.writeView attribute:NSLayoutAttributeBottom multiplier:1 constant:keyboardSize.height];
[self.view removeConstraint:self.bottomConstraintZero];
[self.view addConstraint:self.bottomConstraintKeyboard];
[UIView animateWithDuration:.5 animations:^{
[self.view layoutIfNeeded];
}];
}
- (void)keyboardWillHide:(NSNotification *)notification {
if (self.bottomConstraintKeyboard){
[self.view removeConstraint:self.bottomConstraintKeyboard];
self.bottomConstraintKeyboard = nil;
}
[self.view addConstraint:self.bottomConstraintZero];
[UIView animateWithDuration:.5 animations:^{
[self.view layoutIfNeeded];
}];
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.