Xamarin.form Move up view when keyboard appear
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I'm trying to build a Chat app UI, the idea of the Layout was pretty simple:
When the input bar is focused, keyboard show up and "push" up the chat bar, as it's a grid, the ListView will resize to fit the screen:
I update the input bar's margin to "push" it up:
NSValue result = (NSValue)args.Notification.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
CGSize keyboardSize = result.RectangleFValue.Size;
if (Element != null){
Element.Margin = new Thickness(0, 0, 0,keyboardSize.Height); //push the entry up to keyboard height when keyboard is activated
}
And this is the result:
https://drive.google.com/file/d/1S9yQ6ks15BRH3hH0j_M8awpDJFRFitUi/view?usp=sharing
The view did push up and the ListView also resized as expected, however there are two issues that I had no idea how to solve it:
- How can I retain the ListView scroll position after resize?
- Lack of animation to push up the view
I have search over the web, tried IQKeyboardManager and KeyboardOverLap, The push up animation is nice and smooth, however strange things happened:
https://drive.google.com/file/d/1Zm0lMKB3wq07ve67wlcvLuNM_6Waad7R/view?usp=sharing
- Instead of resizing the ListView, this approach Push the entire ListView up, that I cannot see the first few items, of course the scroll bar can be scroll out of screen
- Extra strange spaces at the bottom of the ListView
Any help will be appreciated, thank you!
Solution:
void OnKeyboardShow(object sender, UIKeyboardEventArgs args)
{
NSValue result = (NSValue)args.Notification.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
CGSize keyboardSize = result.RectangleFValue.Size;
if (Control != null)
{
int bottomMargin = 0;
var sa = UIApplication.SharedApplication.KeyWindow.SafeAreaInsets;
bottomMargin = (int)sa.Bottom;
CGPoint offset = Control.ContentOffset;
var difference = keyboardSize.Height - bottomMargin;
if (Control.ContentSize.Height > Control.Frame.Height)
{
offset.Y += difference;
Control.SetContentOffset(offset, true);
}
else if (Control.ContentSize.Height + keyboardSize.Height > Control.Frame.Height)
{
offset.Y += Control.ContentSize.Height + keyboardSize.Height - Control.Frame.Height - bottomMargin;
Control.SetContentOffset(offset, true);
}
Control.ContentInset = new UIEdgeInsets(0, 0, difference, 0);
Control.ScrollIndicatorInsets = Control.ContentInset;
}
}
void OnKeyboardHide(object sender, UIKeyboardEventArgs args)
{
if (Control != null)
{
Control.ContentInset = new UIEdgeInsets(0, 0, 0, 0);
Control.ScrollIndicatorInsets = new UIEdgeInsets(0, 0, 0, 0);
}
}
ios xamarin
add a comment |
I'm trying to build a Chat app UI, the idea of the Layout was pretty simple:
When the input bar is focused, keyboard show up and "push" up the chat bar, as it's a grid, the ListView will resize to fit the screen:
I update the input bar's margin to "push" it up:
NSValue result = (NSValue)args.Notification.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
CGSize keyboardSize = result.RectangleFValue.Size;
if (Element != null){
Element.Margin = new Thickness(0, 0, 0,keyboardSize.Height); //push the entry up to keyboard height when keyboard is activated
}
And this is the result:
https://drive.google.com/file/d/1S9yQ6ks15BRH3hH0j_M8awpDJFRFitUi/view?usp=sharing
The view did push up and the ListView also resized as expected, however there are two issues that I had no idea how to solve it:
- How can I retain the ListView scroll position after resize?
- Lack of animation to push up the view
I have search over the web, tried IQKeyboardManager and KeyboardOverLap, The push up animation is nice and smooth, however strange things happened:
https://drive.google.com/file/d/1Zm0lMKB3wq07ve67wlcvLuNM_6Waad7R/view?usp=sharing
- Instead of resizing the ListView, this approach Push the entire ListView up, that I cannot see the first few items, of course the scroll bar can be scroll out of screen
- Extra strange spaces at the bottom of the ListView
Any help will be appreciated, thank you!
Solution:
void OnKeyboardShow(object sender, UIKeyboardEventArgs args)
{
NSValue result = (NSValue)args.Notification.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
CGSize keyboardSize = result.RectangleFValue.Size;
if (Control != null)
{
int bottomMargin = 0;
var sa = UIApplication.SharedApplication.KeyWindow.SafeAreaInsets;
bottomMargin = (int)sa.Bottom;
CGPoint offset = Control.ContentOffset;
var difference = keyboardSize.Height - bottomMargin;
if (Control.ContentSize.Height > Control.Frame.Height)
{
offset.Y += difference;
Control.SetContentOffset(offset, true);
}
else if (Control.ContentSize.Height + keyboardSize.Height > Control.Frame.Height)
{
offset.Y += Control.ContentSize.Height + keyboardSize.Height - Control.Frame.Height - bottomMargin;
Control.SetContentOffset(offset, true);
}
Control.ContentInset = new UIEdgeInsets(0, 0, difference, 0);
Control.ScrollIndicatorInsets = Control.ContentInset;
}
}
void OnKeyboardHide(object sender, UIKeyboardEventArgs args)
{
if (Control != null)
{
Control.ContentInset = new UIEdgeInsets(0, 0, 0, 0);
Control.ScrollIndicatorInsets = new UIEdgeInsets(0, 0, 0, 0);
}
}
ios xamarin
add a comment |
I'm trying to build a Chat app UI, the idea of the Layout was pretty simple:
When the input bar is focused, keyboard show up and "push" up the chat bar, as it's a grid, the ListView will resize to fit the screen:
I update the input bar's margin to "push" it up:
NSValue result = (NSValue)args.Notification.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
CGSize keyboardSize = result.RectangleFValue.Size;
if (Element != null){
Element.Margin = new Thickness(0, 0, 0,keyboardSize.Height); //push the entry up to keyboard height when keyboard is activated
}
And this is the result:
https://drive.google.com/file/d/1S9yQ6ks15BRH3hH0j_M8awpDJFRFitUi/view?usp=sharing
The view did push up and the ListView also resized as expected, however there are two issues that I had no idea how to solve it:
- How can I retain the ListView scroll position after resize?
- Lack of animation to push up the view
I have search over the web, tried IQKeyboardManager and KeyboardOverLap, The push up animation is nice and smooth, however strange things happened:
https://drive.google.com/file/d/1Zm0lMKB3wq07ve67wlcvLuNM_6Waad7R/view?usp=sharing
- Instead of resizing the ListView, this approach Push the entire ListView up, that I cannot see the first few items, of course the scroll bar can be scroll out of screen
- Extra strange spaces at the bottom of the ListView
Any help will be appreciated, thank you!
Solution:
void OnKeyboardShow(object sender, UIKeyboardEventArgs args)
{
NSValue result = (NSValue)args.Notification.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
CGSize keyboardSize = result.RectangleFValue.Size;
if (Control != null)
{
int bottomMargin = 0;
var sa = UIApplication.SharedApplication.KeyWindow.SafeAreaInsets;
bottomMargin = (int)sa.Bottom;
CGPoint offset = Control.ContentOffset;
var difference = keyboardSize.Height - bottomMargin;
if (Control.ContentSize.Height > Control.Frame.Height)
{
offset.Y += difference;
Control.SetContentOffset(offset, true);
}
else if (Control.ContentSize.Height + keyboardSize.Height > Control.Frame.Height)
{
offset.Y += Control.ContentSize.Height + keyboardSize.Height - Control.Frame.Height - bottomMargin;
Control.SetContentOffset(offset, true);
}
Control.ContentInset = new UIEdgeInsets(0, 0, difference, 0);
Control.ScrollIndicatorInsets = Control.ContentInset;
}
}
void OnKeyboardHide(object sender, UIKeyboardEventArgs args)
{
if (Control != null)
{
Control.ContentInset = new UIEdgeInsets(0, 0, 0, 0);
Control.ScrollIndicatorInsets = new UIEdgeInsets(0, 0, 0, 0);
}
}
ios xamarin
I'm trying to build a Chat app UI, the idea of the Layout was pretty simple:
When the input bar is focused, keyboard show up and "push" up the chat bar, as it's a grid, the ListView will resize to fit the screen:
I update the input bar's margin to "push" it up:
NSValue result = (NSValue)args.Notification.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
CGSize keyboardSize = result.RectangleFValue.Size;
if (Element != null){
Element.Margin = new Thickness(0, 0, 0,keyboardSize.Height); //push the entry up to keyboard height when keyboard is activated
}
And this is the result:
https://drive.google.com/file/d/1S9yQ6ks15BRH3hH0j_M8awpDJFRFitUi/view?usp=sharing
The view did push up and the ListView also resized as expected, however there are two issues that I had no idea how to solve it:
- How can I retain the ListView scroll position after resize?
- Lack of animation to push up the view
I have search over the web, tried IQKeyboardManager and KeyboardOverLap, The push up animation is nice and smooth, however strange things happened:
https://drive.google.com/file/d/1Zm0lMKB3wq07ve67wlcvLuNM_6Waad7R/view?usp=sharing
- Instead of resizing the ListView, this approach Push the entire ListView up, that I cannot see the first few items, of course the scroll bar can be scroll out of screen
- Extra strange spaces at the bottom of the ListView
Any help will be appreciated, thank you!
Solution:
void OnKeyboardShow(object sender, UIKeyboardEventArgs args)
{
NSValue result = (NSValue)args.Notification.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
CGSize keyboardSize = result.RectangleFValue.Size;
if (Control != null)
{
int bottomMargin = 0;
var sa = UIApplication.SharedApplication.KeyWindow.SafeAreaInsets;
bottomMargin = (int)sa.Bottom;
CGPoint offset = Control.ContentOffset;
var difference = keyboardSize.Height - bottomMargin;
if (Control.ContentSize.Height > Control.Frame.Height)
{
offset.Y += difference;
Control.SetContentOffset(offset, true);
}
else if (Control.ContentSize.Height + keyboardSize.Height > Control.Frame.Height)
{
offset.Y += Control.ContentSize.Height + keyboardSize.Height - Control.Frame.Height - bottomMargin;
Control.SetContentOffset(offset, true);
}
Control.ContentInset = new UIEdgeInsets(0, 0, difference, 0);
Control.ScrollIndicatorInsets = Control.ContentInset;
}
}
void OnKeyboardHide(object sender, UIKeyboardEventArgs args)
{
if (Control != null)
{
Control.ContentInset = new UIEdgeInsets(0, 0, 0, 0);
Control.ScrollIndicatorInsets = new UIEdgeInsets(0, 0, 0, 0);
}
}
ios xamarin
ios xamarin
edited Nov 28 '18 at 3:58
nathan1658
asked Nov 25 '18 at 11:51
nathan1658nathan1658
3117
3117
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Solution:
Refer the following code
in iOS Custom Renderer
protected override void OnElementChanged(ElementChangedEventArgs<ListView> e)
{
base.OnElementChanged(e);
if(Control!=null)
{
Control.KeyboardDismissMode = UIScrollViewKeyboardDismissMode.OnDrag;
NSNotificationCenter.DefaultCenter.AddObserver(this, new Selector("KeyBoardWillShow:"), new NSString("UIKeyboardWillShowNotification"), null);
NSNotificationCenter.DefaultCenter.AddObserver(this, new Selector("KeyBoardWillHide:"), new NSString("UIKeyboardWillHideNotification"), null);
}
}
[Export("KeyBoardWillShow:")]
void KeyBoardWillShow(NSNotification note)
{
NSValue keyboardRect = (NSValue)note.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
Control.ContentInset = new UIEdgeInsets(0,0, keyboardRect.RectangleFValue.Size.Height,0);
}
[Export("KeyBoardWillHide:")]
void KeyBoardWillHide(NSNotification note)
{
Control.ContentInset = UIEdgeInsets.Zero;
}
Hi sorry for the late reply, your solution did push up the view nicely, but it also push up the message when there are only one or few messages, how can I handle that? Thanks
– nathan1658
Nov 28 '18 at 3:43
I think I've solved it, thanks for your help!
– nathan1658
Nov 28 '18 at 3:58
Happy coding :)
– Lucas Zhang - MSFT
Nov 28 '18 at 6:00
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Solution:
Refer the following code
in iOS Custom Renderer
protected override void OnElementChanged(ElementChangedEventArgs<ListView> e)
{
base.OnElementChanged(e);
if(Control!=null)
{
Control.KeyboardDismissMode = UIScrollViewKeyboardDismissMode.OnDrag;
NSNotificationCenter.DefaultCenter.AddObserver(this, new Selector("KeyBoardWillShow:"), new NSString("UIKeyboardWillShowNotification"), null);
NSNotificationCenter.DefaultCenter.AddObserver(this, new Selector("KeyBoardWillHide:"), new NSString("UIKeyboardWillHideNotification"), null);
}
}
[Export("KeyBoardWillShow:")]
void KeyBoardWillShow(NSNotification note)
{
NSValue keyboardRect = (NSValue)note.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
Control.ContentInset = new UIEdgeInsets(0,0, keyboardRect.RectangleFValue.Size.Height,0);
}
[Export("KeyBoardWillHide:")]
void KeyBoardWillHide(NSNotification note)
{
Control.ContentInset = UIEdgeInsets.Zero;
}
Hi sorry for the late reply, your solution did push up the view nicely, but it also push up the message when there are only one or few messages, how can I handle that? Thanks
– nathan1658
Nov 28 '18 at 3:43
I think I've solved it, thanks for your help!
– nathan1658
Nov 28 '18 at 3:58
Happy coding :)
– Lucas Zhang - MSFT
Nov 28 '18 at 6:00
add a comment |
Solution:
Refer the following code
in iOS Custom Renderer
protected override void OnElementChanged(ElementChangedEventArgs<ListView> e)
{
base.OnElementChanged(e);
if(Control!=null)
{
Control.KeyboardDismissMode = UIScrollViewKeyboardDismissMode.OnDrag;
NSNotificationCenter.DefaultCenter.AddObserver(this, new Selector("KeyBoardWillShow:"), new NSString("UIKeyboardWillShowNotification"), null);
NSNotificationCenter.DefaultCenter.AddObserver(this, new Selector("KeyBoardWillHide:"), new NSString("UIKeyboardWillHideNotification"), null);
}
}
[Export("KeyBoardWillShow:")]
void KeyBoardWillShow(NSNotification note)
{
NSValue keyboardRect = (NSValue)note.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
Control.ContentInset = new UIEdgeInsets(0,0, keyboardRect.RectangleFValue.Size.Height,0);
}
[Export("KeyBoardWillHide:")]
void KeyBoardWillHide(NSNotification note)
{
Control.ContentInset = UIEdgeInsets.Zero;
}
Hi sorry for the late reply, your solution did push up the view nicely, but it also push up the message when there are only one or few messages, how can I handle that? Thanks
– nathan1658
Nov 28 '18 at 3:43
I think I've solved it, thanks for your help!
– nathan1658
Nov 28 '18 at 3:58
Happy coding :)
– Lucas Zhang - MSFT
Nov 28 '18 at 6:00
add a comment |
Solution:
Refer the following code
in iOS Custom Renderer
protected override void OnElementChanged(ElementChangedEventArgs<ListView> e)
{
base.OnElementChanged(e);
if(Control!=null)
{
Control.KeyboardDismissMode = UIScrollViewKeyboardDismissMode.OnDrag;
NSNotificationCenter.DefaultCenter.AddObserver(this, new Selector("KeyBoardWillShow:"), new NSString("UIKeyboardWillShowNotification"), null);
NSNotificationCenter.DefaultCenter.AddObserver(this, new Selector("KeyBoardWillHide:"), new NSString("UIKeyboardWillHideNotification"), null);
}
}
[Export("KeyBoardWillShow:")]
void KeyBoardWillShow(NSNotification note)
{
NSValue keyboardRect = (NSValue)note.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
Control.ContentInset = new UIEdgeInsets(0,0, keyboardRect.RectangleFValue.Size.Height,0);
}
[Export("KeyBoardWillHide:")]
void KeyBoardWillHide(NSNotification note)
{
Control.ContentInset = UIEdgeInsets.Zero;
}
Solution:
Refer the following code
in iOS Custom Renderer
protected override void OnElementChanged(ElementChangedEventArgs<ListView> e)
{
base.OnElementChanged(e);
if(Control!=null)
{
Control.KeyboardDismissMode = UIScrollViewKeyboardDismissMode.OnDrag;
NSNotificationCenter.DefaultCenter.AddObserver(this, new Selector("KeyBoardWillShow:"), new NSString("UIKeyboardWillShowNotification"), null);
NSNotificationCenter.DefaultCenter.AddObserver(this, new Selector("KeyBoardWillHide:"), new NSString("UIKeyboardWillHideNotification"), null);
}
}
[Export("KeyBoardWillShow:")]
void KeyBoardWillShow(NSNotification note)
{
NSValue keyboardRect = (NSValue)note.UserInfo.ObjectForKey(new NSString(UIKeyboard.FrameEndUserInfoKey));
Control.ContentInset = new UIEdgeInsets(0,0, keyboardRect.RectangleFValue.Size.Height,0);
}
[Export("KeyBoardWillHide:")]
void KeyBoardWillHide(NSNotification note)
{
Control.ContentInset = UIEdgeInsets.Zero;
}
answered Nov 27 '18 at 8:25
Lucas Zhang - MSFTLucas Zhang - MSFT
3,2152210
3,2152210
Hi sorry for the late reply, your solution did push up the view nicely, but it also push up the message when there are only one or few messages, how can I handle that? Thanks
– nathan1658
Nov 28 '18 at 3:43
I think I've solved it, thanks for your help!
– nathan1658
Nov 28 '18 at 3:58
Happy coding :)
– Lucas Zhang - MSFT
Nov 28 '18 at 6:00
add a comment |
Hi sorry for the late reply, your solution did push up the view nicely, but it also push up the message when there are only one or few messages, how can I handle that? Thanks
– nathan1658
Nov 28 '18 at 3:43
I think I've solved it, thanks for your help!
– nathan1658
Nov 28 '18 at 3:58
Happy coding :)
– Lucas Zhang - MSFT
Nov 28 '18 at 6:00
Hi sorry for the late reply, your solution did push up the view nicely, but it also push up the message when there are only one or few messages, how can I handle that? Thanks
– nathan1658
Nov 28 '18 at 3:43
Hi sorry for the late reply, your solution did push up the view nicely, but it also push up the message when there are only one or few messages, how can I handle that? Thanks
– nathan1658
Nov 28 '18 at 3:43
I think I've solved it, thanks for your help!
– nathan1658
Nov 28 '18 at 3:58
I think I've solved it, thanks for your help!
– nathan1658
Nov 28 '18 at 3:58
Happy coding :)
– Lucas Zhang - MSFT
Nov 28 '18 at 6:00
Happy coding :)
– Lucas Zhang - MSFT
Nov 28 '18 at 6:00
add a comment |
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