fluttercommunity/flutter_webview_plugin

Ios crash when click textbox

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#85 opened on May 25, 2018

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IOSbughelp wanted

Description

Hello, I have a page that has textbox. when i try to edit textbox, app craashing with below error. can you help me please?

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. 
(Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints)

( "<NSAutoresizingMaskLayoutConstraint:0x604000281220 h=-&- v=-&- _UIToolbarContentView:0x7f857b74a620.width == UIToolbar:0x7f857b5474a0.width (active)>", "<NSLayoutConstraint:0x6000000963f0 H:|-(0)-[_UIButtonBarStackView:0x7f857b74bbf0] (active, names: '|':_UIToolbarContentView:0x7f857b74a620 )>", "<NSLayoutConstraint:0x6000000966c0 _UIButtonBarStackView:0x7f857b74bbf0.trailing == _UIToolbarContentView:0x7f857b74a620.trailing + 8 (active)>", "<NSLayoutConstraint:0x600000280550 H:|-(0)-[_UIModernBarButton:0x7f857b603a50] (active, names: '|':_UIButtonBarButton:0x7f857b762b20 )>", "<NSLayoutConstraint:0x6000002805a0 H:[_UIModernBarButton:0x7f857b603a50]-(>=8)-| (active, names: '|':_UIButtonBarButton:0x7f857b762b20 )>", "<NSLayoutConstraint:0x600000280e10 H:|-(>=5)-[_UIModernBarButton:0x7f857b763f40] (active, names: '|':_UIButtonBarButton:0x7f857b7638d0 )>", "<NSLayoutConstraint:0x600000280e60 H:[_UIModernBarButton:0x7f857b763f40]-(>=5)-| (active, names: '|':_UIButtonBarButton:0x7f857b7638d0 )>", "<NSLayoutConstraint:0x60400008ad70 H:|-(8)-[_UIModernBarButton:0x7f857b56cea0'Done'] (active, names: '|':_UIButtonBarButton:0x7f857b764980 )>", "<NSLayoutConstraint:0x604000280b90 H:[_UIModernBarButton:0x7f857b56cea0'Done']-(0)-| (active, names: '|':_UIButtonBarButton:0x7f857b764980 )>", "<NSLayoutConstraint:0x604000280f50 'UISV-canvas-connection' UILayoutGuide:0x6040003af340'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x7f857b762b20.leading (active)>", "<NSLayoutConstraint:0x604000281860 'UISV-canvas-connection' UILayoutGuide:0x6040003af340'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x7f857b764980.trailing (active)>", "<NSLayoutConstraint:0x604000281720 'UISV-spacing' H:[_UIButtonBarButton:0x7f857b762b20]-(0)-[UIView:0x7f857b7636e0] (active)>", "<NSLayoutConstraint:0x6040002819a0 'UISV-spacing' H:[UIView:0x7f857b7636e0]-(0)-[_UIButtonBarButton:0x7f857b7638d0] (active)>", "<NSLayoutConstraint:0x604000281a40 'UISV-spacing' H:[_UIButtonBarButton:0x7f857b7638d0]-(0)-[UIView:0x7f857b764790] (active)>", "<NSLayoutConstraint:0x604000281ae0 'UISV-spacing' H:[UIView:0x7f857b764790]-(0)-[_UIButtonBarButton:0x7f857b764980] (active)>", "<NSLayoutConstraint:0x604000281ef0 'UIView-Encapsulated-Layout-Width' UIToolbar:0x7f857b5474a0.width == 0 (active)>", "<NSLayoutConstraint:0x604000094e60 'UIView-leftMargin-guide-constraint' H:|-(0)-UILayoutGuide:0x6040003af340'UIViewLayoutMarginsGuide' (active, names: '|':_UIButtonBarStackView:0x7f857b74bbf0 )>", "<NSLayoutConstraint:0x604000096300 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x6040003af340'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x7f857b74bbf0 )>" )

Will attempt to recover by breaking constraint <NSLayoutConstraint:0x6000002805a0 H:[_UIModernBarButton:0x7f857b603a50]-(>=8)-| (active, names: '|':_UIButtonBarButton:0x7f857b762b20 )>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful. 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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) ( "<NSAutoresizingMaskLayoutConstraint:0x604000281220 h=-&- v=-&- _UIToolbarContentView:0x7f857b74a620.width == UIToolbar:0x7f857b5474a0.width (active)>", "<NSLayoutConstraint:0x6000000963f0 H:|-(0)-[_UIButtonBarStackView:0x7f857b74bbf0] (active, names: '|':_UIToolbarContentView:0x7f857b74a620 )>", "<NSLayoutConstraint:0x6000000966c0 _UIButtonBarStackView:0x7f857b74bbf0.trailing == _UIToolbarContentView:0x7f857b74a620.trailing + 8 (active)>", "<NSLayoutConstraint:0x600000280e10 H:|-(>=5)-[_UIModernBarButton:0x7f857b763f40] (active, names: '|':_UIButtonBarButton:0x7f857b7638d0 )>", "<NSLayoutConstraint:0x600000280e60 H:[_UIModernBarButton:0x7f857b763f40]-(>=5)-| (active, names: '|':_UIButtonBarButton:0x7f857b7638d0 )>", "<NSLayoutConstraint:0x60400008ad70 H:|-(8)-[_UIModernBarButton:0x7f857b56cea0'Done'] (active, names: '|':_UIButtonBarButton:0x7f857b764980 )>", "<NSLayoutConstraint:0x604000280b90 H:[_UIModernBarButton:0x7f857b56cea0'Done']-(0)-| (active, names: '|':_UIButtonBarButton:0x7f857b764980 )>", "<NSLayoutConstraint:0x604000280f50 'UISV-canvas-connection' UILayoutGuide:0x6040003af340'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x7f857b762b20.leading (active)>", "<NSLayoutConstraint:0x604000281860 'UISV-canvas-connection' UILayoutGuide:0x6040003af340'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x7f857b764980.trailing (active)>", "<NSLayoutConstraint:0x604000281720 'UISV-spacing' H:[_UIButtonBarButton:0x7f857b762b20]-(0)-[UIView:0x7f857b7636e0] (active)>", "<NSLayoutConstraint:0x6040002819a0 'UISV-spacing' H:[UIView:0x7f857b7636e0]-(0)-[_UIButtonBarButton:0x7f857b7638d0] (active)>", "<NSLayoutConstraint:0x604000281a40 'UISV-spacing' H:[_UIButtonBarButton:0x7f857b7638d0]-(0)-[UIView:0x7f857b764790] (active)>", "<NSLayoutConstraint:0x604000281ae0 'UISV-spacing' H:[UIView:0x7f857b764790]-(0)-[_UIButtonBarButton:0x7f857b764980] (active)>", "<NSLayoutConstraint:0x604000281ef0 'UIView-Encapsulated-Layout-Width' UIToolbar:0x7f857b5474a0.width == 0 (active)>", "<NSLayoutConstraint:0x604000094e60 'UIView-leftMargin-guide-constraint' H:|-(0)-UILayoutGuide:0x6040003af340'UIViewLayoutMarginsGuide' (active, names: '|':_UIButtonBarStackView:0x7f857b74bbf0 )>", "<NSLayoutConstraint:0x604000096300 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x6040003af340'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x7f857b74bbf0 )>" )

Contributor guide

Tech stack
iosswift
Domain
mobile
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
unclear
Prerequisites
iOS developmentAuto Layout constraintsSwift or Objective C
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
Investigate the iOS native code in the plugin repository (likely `ios/Classes/FLTWebViewPlugin.swift` or similar) to understand how the keyboard toolbar is configured. Reproduce the crash with a minimal Flutter app containing a text field inside a WebView. Use Xcode's view debugger to identify the conflicting Auto Layout constraints. Check if the issue is related to the toolbar width being set to zero (as shown in the constraint 'UIView Encapsulated Layout Width' UIToolbar width == 0). Potential fix could involve adjusting the constraint priorities or adding a width constraint to the toolbar. Additionally, review any existing comments in the issue for hints.