我有以下代码：
override func loadView() {
super.loadView()
let webConfiguration = WKWebViewConfiguration()
webView = WKWebView(frame: .zero, configuration: webConfiguration)
webView.navigationDelegate = self
view = webView
}
override func viewDidLoad() {
super.viewDidLoad()
let myURL = URL(string: "https://www.w3schools.com/html/html_forms.asp")
let myRequest = URLRequest(url: myURL!)
webView.load(myRequest)
}
但是当我运行它时，只要我单击表单中的输入来键入内容，键盘就会出现，从而推动整个视图。控制台显示以下内容：
[LayoutConstraints] Unable to simultaneously satisfy constraints.
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:0x1c42894c0 h=-&- v=-&- UIToolbar:0x125d24040.width == _UIInputViewContent:0x125d232c0.width (active)>",
"<NSAutoresizingMaskLayoutConstraint:0x1c4289600 h=--& v=--& _UIInputViewContent:0x125d232c0.width == 0 (active)>",
"<NSLayoutConstraint:0x1c4281360 H:|-(0)-[_UIButtonBarStackView:0x125e10970] (active, names: '|':_UIToolbarContentView:0x125d24480 )>",
"<NSLayoutConstraint:0x1c42813b0 _UIButtonBarStackView:0x125e10970.trailing == _UIToolbarContentView:0x125d24480.trailing + 8 (active)>",
"<NSLayoutConstraint:0x1c0282df0 _UIToolbarContentView:0x125d24480.trailing == UIToolbar:0x125d24040.trailing (active)>",
"<NSLayoutConstraint:0x1c0282e90 H:|-(0)-[_UIToolbarContentView:0x125d24480] (active, names: '|':UIToolbar:0x125d24040 )>",
"<NSLayoutConstraint:0x1c4288980 H:|-(>=5)-[_UIModernBarButton:0x125e33a00] (active, names: '|':_UIButtonBarButton:0x125e333b0 )>",
"<NSLayoutConstraint:0x1c42889d0 H:[_UIModernBarButton:0x125e33a00]-(>=5)-| (active, names: '|':_UIButtonBarButton:0x125e333b0 )>",
"<NSLayoutConstraint:0x1c028d5c0 H:|-(8)-[_UIModernBarButton:0x125d4fa20'Done'] (active, names: '|':_UIButtonBarButton:0x125e34320 )>",
"<NSLayoutConstraint:0x1c028d610 H:[_UIModernBarButton:0x125d4fa20'Done']-(0)-| (active, names: '|':_UIButtonBarButton:0x125e34320 )>",
"<NSLayoutConstraint:0x1c028d9d0 'UISV-canvas-connection' UILayoutGuide:0x1c41b88e0'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x125e31e70.leading (active)>",
"<NSLayoutConstraint:0x1c028db10 'UISV-canvas-connection' UILayoutGuide:0x1c41b88e0'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x125e34320.trailing (active)>",
"<NSLayoutConstraint:0x1c028db60 'UISV-spacing' H:[_UIButtonBarButton:0x125e31e70]-(0)-[UIView:0x125e331d0] (active)>",
"<NSLayoutConstraint:0x1c028dbb0 'UISV-spacing' H:[UIView:0x125e331d0]-(0)-[_UIButtonBarButton:0x125e333b0] (active)>",
"<NSLayoutConstraint:0x1c028dc00 'UISV-spacing' H:[_UIButtonBarButton:0x125e333b0]-(0)-[UIView:0x125e34140] (active)>",
"<NSLayoutConstraint:0x1c028dc50 'UISV-spacing' H:[UIView:0x125e34140]-(0)-[_UIButtonBarButton:0x125e34320] (active)>",
"<NSLayoutConstraint:0x1c409e1e0 'UIView-leftMargin-guide-constraint' H:|-(0)-[UILayoutGuide:0x1c41b88e0'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':_UIButtonBarStackView:0x125e10970 )>",
"<NSLayoutConstraint:0x1c4281130 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x1c41b88e0'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x125e10970 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1c42889d0 H:[_UIModernBarButton:0x125e33a00]-(>=5)-| (active, names: '|':_UIButtonBarButton:0x125e333b0 )>
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.
2017-11-07 21:28:10.485532-0500 test[1049:199135] [LayoutConstraints] Unable to simultaneously satisfy constraints.
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:0x1c42894c0 h=-&- v=-&- UIToolbar:0x125d24040.width == _UIInputViewContent:0x125d232c0.width (active)>",
"<NSAutoresizingMaskLayoutConstraint:0x1c4289600 h=--& v=--& _UIInputViewContent:0x125d232c0.width == 0 (active)>",
"<NSLayoutConstraint:0x1c4281360 H:|-(0)-[_UIButtonBarStackView:0x125e10970] (active, names: '|':_UIToolbarContentView:0x125d24480 )>",
"<NSLayoutConstraint:0x1c42813b0 _UIButtonBarStackView:0x125e10970.trailing == _UIToolbarContentView:0x125d24480.trailing + 8 (active)>",
"<NSLayoutConstraint:0x1c0282df0 _UIToolbarContentView:0x125d24480.trailing == UIToolbar:0x125d24040.trailing (active)>",
"<NSLayoutConstraint:0x1c0282e90 H:|-(0)-[_UIToolbarContentView:0x125d24480] (active, names: '|':UIToolbar:0x125d24040 )>",
"<NSLayoutConstraint:0x1c4288340 H:|-(0)-[_UIModernBarButton:0x125e320c0] (active, names: '|':_UIButtonBarButton:0x125e31e70 )>",
"<NSLayoutConstraint:0x1c4288390 H:[_UIModernBarButton:0x125e320c0]-(>=8)-| (active, names: '|':_UIButtonBarButton:0x125e31e70 )>",
"<NSLayoutConstraint:0x1c028d5c0 H:|-(8)-[_UIModernBarButton:0x125d4fa20'Done'] (active, names: '|':_UIButtonBarButton:0x125e34320 )>",
"<NSLayoutConstraint:0x1c028d610 H:[_UIModernBarButton:0x125d4fa20'Done']-(0)-| (active, names: '|':_UIButtonBarButton:0x125e34320 )>",
"<NSLayoutConstraint:0x1c028d9d0 'UISV-canvas-connection' UILayoutGuide:0x1c41b88e0'UIViewLayoutMarginsGuide'.leading == _UIButtonBarButton:0x125e31e70.leading (active)>",
"<NSLayoutConstraint:0x1c028db10 'UISV-canvas-connection' UILayoutGuide:0x1c41b88e0'UIViewLayoutMarginsGuide'.trailing == _UIButtonBarButton:0x125e34320.trailing (active)>",
"<NSLayoutConstraint:0x1c028db60 'UISV-spacing' H:[_UIButtonBarButton:0x125e31e70]-(0)-[UIView:0x125e331d0] (active)>",
"<NSLayoutConstraint:0x1c028dbb0 'UISV-spacing' H:[UIView:0x125e331d0]-(0)-[_UIButtonBarButton:0x125e333b0] (active)>",
"<NSLayoutConstraint:0x1c028dc00 'UISV-spacing' H:[_UIButtonBarButton:0x125e333b0]-(0)-[UIView:0x125e34140] (active)>",
"<NSLayoutConstraint:0x1c028dc50 'UISV-spacing' H:[UIView:0x125e34140]-(0)-[_UIButtonBarButton:0x125e34320] (active)>",
"<NSLayoutConstraint:0x1c409e1e0 'UIView-leftMargin-guide-constraint' H:|-(0)-[UILayoutGuide:0x1c41b88e0'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':_UIButtonBarStackView:0x125e10970 )>",
"<NSLayoutConstraint:0x1c4281130 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x1c41b88e0'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x125e10970 )>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x1c4288390 H:[_UIModernBarButton:0x125e320c0]-(>=8)-| (active, names: '|':_UIButtonBarButton:0x125e31e70 )>
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.
如何在单击表单中的输入时使WKWebView具有有效约束？