Getting error in Flutter Share only on iPad

[saeedjassani]

When using the Share plugin on iPad, I am getting the following error:

    "<ShareData: 0x60000091e620>"
)
        Probably at least one of the constraints in the following list is one you don't want.
        Try this:
                (1) look at each constraint and try to figure out which you don't expect;
                (2) find the code that added the unwanted constraint or constraints and fix it.
(
    "<NSLayoutConstraint:0x600002a935c0 LPLinkView:0x7fbcd8e1e970.leading == UILayoutGuide:0x600003010700'UIViewLayoutMarginsGuide'.leading   (active)>",
    "<NSLayoutConstraint:0x600002a926c0 H:[LPLinkView:0x7fbcd8e1e970]-(59)-|   (active, names: '|':_UIActivityContentTitleView:0x7fbcd66fa360 )>",
    "<NSLayoutConstraint:0x600002a868f0 H:|-(0)-[_UIActivityContentTitleView:0x7fbcd66fa360]   (active, names: '|':_UINavigationBarContentView:0x7fbcd8e20880 )>",
    "<NSLayoutConstraint:0x600002a86b70 _UIActivityContentTitleView:0x7fbcd66fa360.trailing == _UINavigationBarContentView:0x7fbcd8e20880.trailing   (active)>",
    "<NSLayoutConstraint:0x600002a87110 'UIView-Encapsulated-Layout-Width' _UINavigationBarContentView:0x7fbcd8e20880.width == 0   (active)>",
    "<NSLayoutConstraint:0x600002a93de0 'UIView-leftMargin-guide-constraint' H:|-(16)-[UILayoutGuide:0x600003010700'UIViewLayoutMarginsGuide'](LTR)   (active, names: '|':_UIActivityContentTitleView:0x7fbcd66fa360 )>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x600002a935c0 LPLinkView:0x7fbcd8e1e970.leading == UILayoutGuide:0x600003010700'UIViewLayoutMarginsGuide'.leading   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.

Sharing functionality is working fine in Android as well as iPhones. Getting the above error in iPad only.

Flutter doctor output:

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, v1.10.17-pre.77, on Mac OS X 10.15.1 19B88, locale en-US)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 11.2.1)
[✓] Android Studio (version 3.5)
[✓] VS Code (version 1.29.1)
[✓] Connected device (1 available)

• No issues found!

Any help will be greatly appreciated, thanks!

[iapicca]

Hi @saeedjassani
could you please provide a minimal code sample to reproduce the problem
Thank you

[saeedjassani]

Code to reproduce:

Share.share('check out my website https://example.com');

[agreensh]

Looking at the code for the share plugin, I see this

if (!CGRectIsEmpty(origin)) { activityViewController.popoverPresentationController.sourceRect = origin; }

so unless the caller supplies a 'sharePositionOrigin' rect, this will fail on an iPad (as on iPad the 'popoverPresentationController.sourceRect' has to be supplied), so its a bug in the plugin.

Simple workaround would be to pass in a (non-empty, so has width and height) sharePositionOrigin' rect in the Share.share(...) function (but needs the plugin updated to supply a default rect on iPad if no rect supplied - so check if userInterfaceIdiom == UIUserInterfaceIdiomPad - perhaps positioned bottom centre).

[saeedjassani]

Thanks for you comment @agreensh . I don't have any experience of iOS development. Can you suggest any work-around for me which which help me solve the issue?

[agreensh]

Thanks for you comment @agreensh . I don't have any experience of iOS development. Can you suggest any work-around for me which which help me solve the issue?

I have... in your Dart code, pass the sharePositionOrigin parameter with non-zero rect to Share.share(...).

[sensuikan1973]

I have the same problem.

Cause

https://github.com/flutter/plugins/blob/8380988745e4bfe6c8d547272b4fe1c3193514be/packages/share/ios/Classes/SharePlugin.m#L102-L105

  if (!CGRectIsEmpty(origin)) {
    activityViewController.popoverPresentationController.sourceRect = origin;
  }
  [controller presentViewController:activityViewController animated:YES completion:nil];

In iPad, ActionSheet always shows as popover.
So, if I do not pass sharePositionOrigin, this error occurs. i think.

Workaround

I expressly pass sharePositionOrigin like this.

await Share.share(
  'foo',
  sharePositionOrigin: Rect.fromCenter(center: Offset(100, 100), width: 100, height: 100),
)

if I attatch workaround to only iPad, use deviceinfo plugin. like this.

Future<bool> _isIpad() async {
  final iosInfo = await DeviceInfoPlugin().iosInfo;
  return iosInfo.name.toLowerCase().contains('ipad');
}

But this behavior is not ideal...

[bowenchin]

I am facing the same issues too. The share sheet refuses to pop up on iPad, but works fine on iPhone.

[agreensh]

Have you used the workaround?

[bowenchin]

Yes I have used the workaround and now the Share sheet shows up on the iPad, however, it's not an ideal long term solution.

[karmazinkd]

I have the same problem.

Cause

https://github.com/flutter/plugins/blob/8380988745e4bfe6c8d547272b4fe1c3193514be/packages/share/ios/Classes/SharePlugin.m#L102-L105

  if (!CGRectIsEmpty(origin)) {
    activityViewController.popoverPresentationController.sourceRect = origin;
  }
  [controller presentViewController:activityViewController animated:YES completion:nil];

In iPad, ActionSheet always shows as popover.
So, if I do not pass sharePositionOrigin, this error occurs. i think.

Workaround

I expressly pass sharePositionOrigin like this.

await Share.share(
  'foo',
  sharePositionOrigin: Rect.fromCenter(center: Offset(100, 100), width: 100, height: 100),
)

if I attatch workaround to only iPad, use deviceinfo plugin. like this.

Future<bool> _isIpad() async {
  final iosInfo = await DeviceInfoPlugin().iosInfo;
  return iosInfo.name.toLowerCase().contains('ipad');
}

But this behavior is not ideal...

Thank you. With this workaround, it doesn't crash which is great.
But here is one thing: it shows this pop-up dialog.

and when you tap on 'Edit Actions...' it throws the same exception in the log (doesn't crash though):

Probably at least one of the constraints in the following list is one you don't want. 
	Try this: 
		(1) look at each constraint and try to figure out which you don't expect; 
		(2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x600002e16e40 V:|-(15)-[UILabel:0x7fb9c0443b40]   (active, names: '|':UITableViewCellContentView:0x7fb9c04437e0 )>",
    "<NSLayoutConstraint:0x600002e17840 V:[UILabel:0x7fb9c0443b40]-(15)-|   (active, names: '|':UITableViewCellContentView:0x7fb9c04437e0 )>",
    "<NSLayoutConstraint:0x600002e14870 UILabel:0x7fb9c0443b40.height >= 22   (active)>",
    "<NSLayoutConstraint:0x600002e276b0 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7fb9c04437e0.height == 44   (active)>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x600002e14870 UILabel:0x7fb9c0443b40.height >= 22   (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.

XCode 11.3.1
iPad Pro (3-gen) simulator.
iOS 13.3

[iapicca]

Hi @saeedjassani
I see there's an open issue addressing the case you described.
Please follow up on that issue,
I'm closing the current one as duplicate.
If you disagree please write in the comments
and I will reopen it.
Thank you

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.