Iphone 隐藏键盘时如何向下滚动视图
我有一个有文本字段的视图。还将键盘配置为“已完成”按钮以隐藏键盘。我已将委托附加到我的txtfield,以便在显示键盘时向上滚动。它工作正常,但当我单击“完成”隐藏键盘时,视图仍会向上滚动,用户必须手动将其向后滚动。。有没有解决这个问题的想法/方法 下面是我实现向上滚动功能的代码Iphone 隐藏键盘时如何向下滚动视图,iphone,ios,objective-c,Iphone,Ios,Objective C,我有一个有文本字段的视图。还将键盘配置为“已完成”按钮以隐藏键盘。我已将委托附加到我的txtfield,以便在显示键盘时向上滚动。它工作正常,但当我单击“完成”隐藏键盘时,视图仍会向上滚动,用户必须手动将其向后滚动。。有没有解决这个问题的想法/方法 下面是我实现向上滚动功能的代码 - (void)viewWillAppear:(BOOL)animated { [super viewDidAppear:animated]; keyboardIsShown = NO; [[
- (void)viewWillAppear:(BOOL)animated
{
[super viewDidAppear:animated];
keyboardIsShown = NO;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:self.view.window];
// register for keyboard notifications
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:self.view.window];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillHideNotification
object:nil];
}
- (void)keyboardWillShow:(NSNotification *)n
{
if (keyboardIsShown) {
return;
}
NSDictionary* userInfo = [n userInfo];
// get the size of the keyboard
CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
// resize the noteView
CGRect viewFrame = self.scrollView.frame;
// I'm also subtracting a constant kTabBarHeight because my UIScrollView was offset by the UITabBar so really only the portion of the keyboard that is leftover pass the UITabBar is obscuring my UIScrollView.
viewFrame.size.height -= (keyboardSize.height - kTabBarHeight);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
// The kKeyboardAnimationDuration I am using is 0.3
[UIView setAnimationDuration:kKeyboardAnimationDuration];
[self.scrollView setFrame:viewFrame];
[UIView commitAnimations];
scrollView.contentSize = formView.frame.size;
keyboardIsShown = YES;
}
- (void)keyboardWillHide:(NSNotification *)n
{
NSDictionary* userInfo = [n userInfo];
// get the size of the keyboard
CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
// resize the scrollview
CGRect viewFrame = self.scrollView.frame;
// I'm also subtracting a constant kTabBarHeight because my UIScrollView was offset by the UITabBar so really only the portion of the keyboard that is leftover pass the UITabBar is obscuring my UIScrollView.
viewFrame.size.height += (keyboardSize.height - kTabBarHeight);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
// The kKeyboardAnimationDuration I am using is 0.3
[UIView setAnimationDuration:kKeyboardAnimationDuration];
[self.scrollView setFrame:viewFrame];
[UIView commitAnimations];
keyboardIsShown = NO;
}
如果您只想用动画滚动回顶部
-(void)keyboardWillHide:(NSNotification *)notification {
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
CGPoint top = CGPointMake(0, 0);
[self.scrollView setContentOffset:top animated:YES];
self.scrollView.scrollIndicatorInsets = contentInsets;
}
上述实现中不需要keyboardIsShown实例变量请尝试以下操作:
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, 216, 0.0);
self.scrollView.contentInset = contentInsets;
self.scrollView.scrollIndicatorInsets = contentInsets;
CGRect frame = CGRectMake(0, textFieds.frame.origin.y + kOtherViewsHeightWhichMightNotBeInSameViewAsScrollView, 10, 10);
[self.scrollView scrollRectToVisible:frame] animated:YES];
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
self.scrollView.contentInset = contentInsets;
self.scrollView.scrollIndicatorInsets = contentInsets;
return YES;
}
不要忘记将视图控制器设置为文本字段的代理您可以通过删除所有已注册的观察者来缩短代码:[[NSNotificationCenter defaultCenter]removeObserver:self];谢谢@kyle C。。我添加了CGPoint top=CGPointMake(0,-65);以及它的工作原理。希望Y坐标的硬编码不会产生任何问题??有什么建议吗。