Ios 当键盘弹出时,WKWebView约束问题
当Ios 当键盘弹出时,WKWebView约束问题,ios,swift,wkwebview,Ios,Swift,Wkwebview,当WKWebView中的输入聚焦时,会弹出一个约束错误 代码: class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad(); let wv = WKWebView(frame: CGRect(x: 100, y: 100, width: 100, height: 100)); wv.loadHTMLString("<
WKWebView
中的输入聚焦时,会弹出一个约束错误
代码:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad();
let wv = WKWebView(frame: CGRect(x: 100, y: 100, width: 100, height: 100));
wv.loadHTMLString("<input type='text'/>", baseURL: nil); // it also can be select, it makes no difference
view.addSubview(wv);
}
}
类ViewController:UIViewController{
重写func viewDidLoad(){
super.viewDidLoad();
设wv=WKWebView(帧:CGRect(x:100,y:100,宽度:100,高度:100));
wv.loadHTMLString(“,baseURL:nil);//它也可以被选择,没有区别
视图。添加子视图(wv);
}
}
错误日志:
2017-11-05 00:26:28.861439+0700 achievator[20048:75393577] [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:0x60c0000955e0 h=-&- v=-&- UIToolbar:0x7f8540419570.width ==
_UIInputViewContent:0x7f8540411830.width (active)>",
"<NSAutoresizingMaskLayoutConstraint:0x60c000095720 h=--& v=--& _UIInputViewContent:0x7f8540411830.width == 0 (active)>",
"<NSLayoutConstraint:0x60800009a9a0 H:|-(0)-[_UIButtonBarStackView:0x7f854041b2d0] (active, names: '|':_UIToolbarContentView:0x7f8540402de0 )>",
"<NSLayoutConstraint:0x60800009a9f0 _UIButtonBarStackView:0x7f854041b2d0.trailing == _UIToolbarContentView:0x7f8540402de0.trailing + 8 (active)>",
"<NSLayoutConstraint:0x608000099a00 _UIToolbarContentView:0x7f8540402de0.trailing == UIToolbar:0x7f8540419570.trailing (active)>",
"<NSLayoutConstraint:0x608000099aa0 H:|-(0)-[_UIToolbarContentView:0x7f8540402de0] (active, names: '|':UIToolbar:0x7f8540419570 )>",
"<NSLayoutConstraint:0x6040000981a0 H:|-(0)-[_UIModernBarButton:0x7f854050ef70] (active, names: '|':_UIButtonBarButton:0x7f854050e7f0 )>",
"<NSLayoutConstraint:0x6040000981f0 H:[_UIModernBarButton:0x7f854050ef70]-(>=8)-| (active, names: '|':_UIButtonBarButton:0x7f854050e7f0 )>",
"<NSLayoutConstraint:0x6040000999b0 H:|-(8)-[_UIModernBarButton:0x7f8540512450'Done'] (active, names: '|':_UIButtonBarButton:0x7f8540511660 )>",
"<NSLayoutConstraint:0x604000099a00 H:[_UIModernBarButton:0x7f8540512450'Done']-(0)-| (active, names: '|':_UIButtonBarButton:0x7f8540511660 )>",
"<NSLayoutConstraint:0x60c000094690 'UISV-canvas-connection' UILayoutGuide:0x6080001a9a00'UIViewLayoutMarginsGuide'.leading ==
_UIButtonBarButton:0x7f854050e7f0.leading (active)>",
"<NSLayoutConstraint:0x60c0000946e0 'UISV-canvas-connection' UILayoutGuide:0x6080001a9a00'UIViewLayoutMarginsGuide'.trailing ==
_UIButtonBarButton:0x7f8540511660.trailing (active)>",
"<NSLayoutConstraint:0x60c000094780 'UISV-spacing' H:[_UIButtonBarButton:0x7f854050e7f0]-(0)-[UIView:0x7f854050f4c0] (active)>",
"<NSLayoutConstraint:0x60c000094960 'UISV-spacing' H:[UIView:0x7f854050f4c0]-(0)-[_UIButtonBarButton:0x7f854050ea30] (active)>",
"<NSLayoutConstraint:0x60c000094a00 'UISV-spacing' H:[_UIButtonBarButton:0x7f854050ea30]-(0)-[UIView:0x7f8540511480] (active)>",
"<NSLayoutConstraint:0x60c000094a50 'UISV-spacing' H:[UIView:0x7f8540511480]-(0)-[_UIButtonBarButton:0x7f8540511660] (active)>",
"<NSLayoutConstraint:0x60800009a6d0 'UIView-leftMargin-guide-constraint' H:|-(0)-[UILayoutGuide:0x6080001a9a00'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':_UIButtonBarStackView:0x7f854041b2d0 )>",
"<NSLayoutConstraint:0x60800009a770 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x6080001a9a00'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x7f854041b2d0 )>" )
Will attempt to recover by breaking constraint <NSLayoutConstraint:0x6040000981f0 H:[_UIModernBarButton:0x7f854050ef70]-(>=8)-| (active, names: '|':_UIButtonBarButton:0x7f854050e7f0 )>
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. 2017-11-05 00:26:28.863156+0700 achievator[20048:75393577] [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:0x60c0000955e0 h=-&- v=-&- UIToolbar:0x7f8540419570.width ==
_UIInputViewContent:0x7f8540411830.width (active)>",
"<NSAutoresizingMaskLayoutConstraint:0x60c000095720 h=--& v=--& _UIInputViewContent:0x7f8540411830.width == 0 (active)>",
"<NSLayoutConstraint:0x60800009a9a0 H:|-(0)-[_UIButtonBarStackView:0x7f854041b2d0] (active, names: '|':_UIToolbarContentView:0x7f8540402de0 )>",
"<NSLayoutConstraint:0x60800009a9f0 _UIButtonBarStackView:0x7f854041b2d0.trailing == _UIToolbarContentView:0x7f8540402de0.trailing + 8 (active)>",
"<NSLayoutConstraint:0x608000099a00 _UIToolbarContentView:0x7f8540402de0.trailing == UIToolbar:0x7f8540419570.trailing (active)>",
"<NSLayoutConstraint:0x608000099aa0 H:|-(0)-[_UIToolbarContentView:0x7f8540402de0] (active, names: '|':UIToolbar:0x7f8540419570 )>",
"<NSLayoutConstraint:0x604000098560 H:|-(>=5)-[_UIModernBarButton:0x7f8540510b40] (active, names: '|':_UIButtonBarButton:0x7f854050ea30 )>",
"<NSLayoutConstraint:0x604000098650 H:[_UIModernBarButton:0x7f8540510b40]-(>=5)-| (active, names: '|':_UIButtonBarButton:0x7f854050ea30 )>",
"<NSLayoutConstraint:0x6040000999b0 H:|-(8)-[_UIModernBarButton:0x7f8540512450'Done'] (active, names: '|':_UIButtonBarButton:0x7f8540511660 )>",
"<NSLayoutConstraint:0x604000099a00 H:[_UIModernBarButton:0x7f8540512450'Done']-(0)-| (active, names: '|':_UIButtonBarButton:0x7f8540511660 )>",
"<NSLayoutConstraint:0x60c000094690 'UISV-canvas-connection' UILayoutGuide:0x6080001a9a00'UIViewLayoutMarginsGuide'.leading ==
_UIButtonBarButton:0x7f854050e7f0.leading (active)>",
"<NSLayoutConstraint:0x60c0000946e0 'UISV-canvas-connection' UILayoutGuide:0x6080001a9a00'UIViewLayoutMarginsGuide'.trailing ==
_UIButtonBarButton:0x7f8540511660.trailing (active)>",
"<NSLayoutConstraint:0x60c000094780 'UISV-spacing' H:[_UIButtonBarButton:0x7f854050e7f0]-(0)-[UIView:0x7f854050f4c0] (active)>",
"<NSLayoutConstraint:0x60c000094960 'UISV-spacing' H:[UIView:0x7f854050f4c0]-(0)-[_UIButtonBarButton:0x7f854050ea30] (active)>",
"<NSLayoutConstraint:0x60c000094a00 'UISV-spacing' H:[_UIButtonBarButton:0x7f854050ea30]-(0)-[UIView:0x7f8540511480] (active)>",
"<NSLayoutConstraint:0x60c000094a50 'UISV-spacing' H:[UIView:0x7f8540511480]-(0)-[_UIButtonBarButton:0x7f8540511660] (active)>",
"<NSLayoutConstraint:0x60800009a6d0 'UIView-leftMargin-guide-constraint' H:|-(0)-[UILayoutGuide:0x6080001a9a00'UIViewLayoutMarginsGuide'](LTR) (active, names: '|':_UIButtonBarStackView:0x7f854041b2d0 )>",
"<NSLayoutConstraint:0x60800009a770 'UIView-rightMargin-guide-constraint' H:[UILayoutGuide:0x6080001a9a00'UIViewLayoutMarginsGuide']-(0)-|(LTR) (active, names: '|':_UIButtonBarStackView:0x7f854041b2d0 )>" )
Will attempt to recover by breaking constraint <NSLayoutConstraint:0x604000098650 H:[_UIModernBarButton:0x7f8540510b40]-(>=5)-| (active, names: '|':_UIButtonBarButton:0x7f854050ea30 )>
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.
2017-11-05 00:26:28.861439+0700实现者[20048:75393577][布局约束]无法同时满足约束。可能下面列表中至少有一个约束是您不想要的。试着这样做:(1)看看每个约束,试着找出你不期望的约束;(2) 找到添加了不需要的约束的代码,然后修复它。(注意:如果您看到不理解的NSAutoresizingMaskLayoutConstraints,请参阅UIView属性TranslatesAutoResizingMaskToConstraints的文档)(
"",
"",
"",
"",
"",
"",
"",
“=8)-|(活动,名称:'|':_UIButtonBarButton:0x7f854050e7f0)>”,
"",
"",
"",
"",
"",
"",
"",
"",
"",
"" )
将尝试通过断开约束=8)-|(活动,名称:'|':_UIButtonBarButton:0x7f854050e7f0)进行恢复>
在UIViewAlertForUnsatifiableConstraints处创建一个符号断点,以便在调试器中捕获该断点。中列出的UIView上UIConstraintBasedLayoutDebugging类别中的方法也可能会有所帮助。2017-11-05 00:26:28.863156+0700实现者[20048:75393577][布局约束]无法同时满足约束。可能下面列表中至少有一个约束是您不想要的。试着这样做:(1)看看每个约束,试着找出你不期望的约束;(2) 找到添加了不需要的约束的代码,然后修复它。(注意:如果您看到不理解的NSAutoresizingMaskLayoutConstraints,请参阅UIView属性TranslatesAutoResizingMaskToConstraints的文档)(
"",
"",
"",
"",
"",
"",
“=5”-[_UIModernBarButton:0x7f8540510b40](活动,名称:“|”):_UIButtonBarButton:0x7f854050ea30)>”,
“=5)-|(活动,名称:‘|’:UIButtonBarButton:0x7f854050ea30)>”,
"",
"",
"",
"",
"",
"",
"",
"",
"",
"" )
将尝试通过断开约束=5)-|(活动,名称:“|”):_UIButtonBarButton:0x7f854050ea30)进行恢复>
在UIViewAlertForUnsatifiableConstraints处创建一个符号断点,以便在调试器中捕获该断点。中列出的UIView上UIConstraintBasedLayoutDebugging类别中的方法也可能会有所帮助。
当键盘打开时,一个或多个约束同时不兼容
尝试将约束设置为WKWebView,而不是手动创建框架
private func addWKWebView(){
let wv = WKWebView()
view.addSubview(wv);
wv.translatesAutoresizingMaskIntoConstraints = false
wv.widthAnchor.constraint(equalTo: view.widthAnchor ).isActive = true
wv.heightAnchor.constraint(equalTo: view.heightAnchor ).isActive = true
wv.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
wv.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
}
或者像这样:
private func addWKWebView(){
let wv = WKWebView()
view.addSubview(wv);
wv.translatesAutoresizingMaskIntoConstraints = false
wv.widthAnchor.constraint(equalToConstant: 100).isActive = true
wv.heightAnchor.constraint(equalToConstant: 100).isActive = true
wv.widthAnchor.constraint(equalToConstant: 100).isActive = true
wv.heightAnchor.constraint(equalToConstant: 100).isActive = true
}
你需要利用你的约束来设置你想要的WkWebView。我的假设是这是ios 11中的一个bug。投诉是关于键盘按钮栏中的组件,这些组件都使用操作系统设置的默认值。我在ios 9和ios 10上运行了相同的代码,没有收到错误消息。有相同的问题。我正在运行一个干净的项目,香草设置,这个问题会在webview键盘得到关注后立即出现。这似乎是一个常见的问题,可能只是iOS 11中的一个bug 另见:
两种方法都试过了,但都没用。在这两种情况下,错误仍然会弹出。然后可能是您的其他约束。你为什么不在情节提要中添加WKWebView,这样你就可以实时看到哪些约束在抱怨。你也可以尝试为其中4个添加低优先级:let width=wv.widthAnchor.constraint(equalToConstant:100)width.isActive=true width.priority=.defaultLowIt对iOS 13没有帮助。这里也一样。Ios 14。仍在等待解决方案是否有任何解决方案?这个问题能解决吗?如果您只想删除底部的空白,请在iOS 13 beta 5上获得相同的结果:
NotificationCenter.default.addObserver(forName:UIResponder.keyboardWillHideNotification,object:nil,queue:nil){(self.webView.scrollView.contentOffset.y=0}
@swalkner如果偏移量不同于0,您可以在keyboardWillShowNotification
中获取内容偏移量值,并在keyboardWillHideNotification