UIWebView键盘的accessoryBar隐藏.doc

1、UIWebView 键盘的 accessoryBar 隐藏当前越来越多的 iOS 应用开始使用 html 进行交互显示，却会发现在 UIWebView 弹出的键盘比 UITextView 的键盘多出了左右移动以及完成按钮，那么如何去掉这些我们并不需要的按钮呢？苹果官方并没有给出方法，所以我们只能够自己来解决。 webview_keyboard.png对于不同的 iOS 版本，我们的处理方法也会不同，因为官方没有提供方法，所有的方法都是需要自己去发现和修改。这里只写出 iOS7 以上版本的方法：func hideKeyBoard() - V oid for window inUIApplicat

2、ion.sharedApplication().windows if !window.isMemberOfClass(UIWindow.self) let keyboardWindow = windowif #available(iOS 9.0, *) self.removeAccessoryBarForiOS9(keyboardWindow as UIView) else if #available(iOS 8.0, *) self.removeAccessoryBarForiOS8(keyboardWindow as UIView) else self.removeAccessoryBar

3、ForiOS7(keyboardWindow as UIView)if #available(iOS 9.0, *) self.removeAccessoryBarForiOS9(UIApplication.sharedApplica tion().windows.last! as UIView)funcremoveAccessoryBarForiOS9(keyboardWindow:UIView) -Void for possibleFormView:UIView inkeyboardWindow.subviews ifpossibleFormView.isMemberOfClass(NSC

4、lassFromString(UII nputSetContainerView)!) for subviewOfInputSetContainerView in possibleFormView.subviews ifsubviewOfInputSetContainerView.isMemberOfClass(NSClassFromString(UIInputSetHostView)!) for subviewOfInputSetHostViewin subviewOfInputSetContainerView.subviews / 隐藏工具条NSClassFromStringifsubvie

5、wOfInputSetHostView.isMemberOfClass(NSClassFromString(UIWebFormAccessory)!) subviewOfInputSetHostView.layer.opacity = 0subviewOfInputSetHostView.frame = CGRectZero else if(subviewOfInputSetHostView.isMemberOfClass(NSClassFrom String(_UIRemoteKeyboardPlaceholderView)!) subviewOfInputSetHostView.layer

6、.opacity = 0subviewOfInputSetHostView.frame = CGRectZero/ 这里使用了私有方法获取对应的accessorBar，然后进行隐藏var accessory =subviewOfInputSetHostView.performSelector(Selector(placeheldView).takeRetainedValue()ifaccessory.isMemberOfClass(NSClassFromString(UIWebFormAccessory)!) let accessory =accessory as! UIViewaccesso

7、ry.layer.opacity = 0accessory.frame =CGRectZero/ 键盘背景 ,UIKBInputBackdropView有两个只隐藏上面的else ifsubviewOfInputSetHostView.isMemberOfClass(NSClassFromString(UIKBInputBackdropView)!) &subviewOfInputSetHostView.frame.size.height Void for possibleFormView:UIView inkeyboardWindow.subviews ifpossibleFormView.

8、isMemberOfClass(NSClassFromString(UIInputSetContainerView)!) for subviewOfInputSetContainerView in possibleFormView.subviews ifsubviewOfInputSetContainerView.isMemberOfClass(NSClassFromString(UIInputSetHostView)!) for subviewOfInputSetHostViewin subviewOfInputSetContainerView.subviews / 隐藏工具条ifsubvi

9、ewOfInputSetHostView.isMemberOfClass(NSClassFromString(UIWebFormAccessory)!) subviewOfInputSetHostView.layer.opacity = 0subviewOfInputSetHostView.frame = CGRectZero/ 键盘背景 ,UIKBInputBackdropView有两个只隐藏上面的else ifsubviewOfInputSetHostView.isMemberOfClass(NSClassFromS tring(UIKBInputBackdropView)!) & sub

10、viewOfInputSetHostView.frame.size.height Void for possibleFormView:UIView inkeyboardWindow.subviews ifpossibleFormView.isMemberOfClass(NSClassFromString(UIPeripheralHostView)!) for subviewOfPeripheralHostView inpossibleFormView.subviews / 隐藏工具条ifsubviewOfPeripheralHostView.isMemberOfClass(NSClassFro

11、mString(UIWebFormAccessory)!) subviewOfPeripheralHostView.layer.opacity = 0subviewOfPeripheralHostView.frame = CGRectZero/ 键盘背景 ,UIKBInputBackdropView 有两个只隐藏上面的else ifsubviewOfPeripheralHostView.isMemberOfClass(NSClassFromString(UIKBInputBackdropView)!) &subviewOfPeripheralHostView.frame.size.height

12、 100 subviewOfPeripheralHostView.layer.opacity = 0subviewOfPeripheralHostView.userInteractionEnabled = false实际中，隐藏键盘accessory 后的样子如下图：webview_keyboard_hideaccessory.png需要注意的是，在示例代码使用设置layer 透明， frame 为空来进行隐藏，而不使用removeFromSuperView ，是因为使用了 removeFromSuperView ，在键盘重新布局时会导致crash。当然如果有朋友解决了crash，使用 rem

13、oveFromSuperView会更好。附：上面示例代码Github 地址使用 removeFromSuperView 产生 crash 的崩溃栈：2016-07-06 14:10:32.018 WebViewKeyBoard10846:930540 The view hierarchy is not prepared for the constraint:When added to a view, the constraints items must be descendants of that view (or the view itself). This will crash ifthe

14、 constraint needs to be resolved before the view hierarchy is assembled. Break on -UIView(UIConstraintBasedLayout) _viewHierarchyUnpreparedForConstraint: to debug.2016-07-06 14:10:32.018 WebViewKeyBoard10846:930540* Assertion failure in -UIInputSetHostView_layoutEngine_didAddLayoutConstraint:roundin

15、gAdjustment:mutuallyExclusiveConstraints:,/BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3512.60.7/NSLayoutConstraint_UIKitAdditions.m:5902016-07-06 14:10:32.025 WebViewKeyBoard10846:930540* Terminating app due to uncaught exception NSInternalInconsistencyException, reason: Impossib

16、le to set up layout with view hierarchy unprepared for constraint.* First throw call stack:(0CoreFoundation0x0000000105517d85 _exceptionPreprocess + 165 1 libobjc.A.dylib0x00000001072bbdeb objc_exception_throw + 48 2 CoreFoundation0x0000000105517bea +NSException raise:format:arguments: + 1063Foundat

17、ion0x0000000105968d5a -NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description: + 1984 UIKit 0x0000000106626b99_120-UIView(UIConstraintBasedLayout)_layoutEngine_didAddLayoutConstraint:roundingAdjustment:m utuallyExclusiveConstraints:_block_invoke_2 + 2545 UIKit0x000000010662698b

18、-UIView(UIConstraintBasedLayout)_layoutEngine_didAddLayoutConstraint:roundingAdjustment:m utuallyExclusiveConstraints: + 3856UIKit0x0000000106626e04 -UIView(UIConstraintBasedLayout)_tryToAddConstraintWithoutUpdatingConstraintsArray:roundin gAdjustment:mutuallyExclusiveConstraints: + 657UIKit0x000000

19、0106626f7d -UIView(UIConstraintBasedLayout)_tryToAddConstraint:roundingAdjustment:mutuallyExclusiveC onstraints: + 2888UIKit0x000000010662719f -UIView(UIConstraintBasedLayout)_addConstraint: + 2749UIKit0x0000000106627438 _50-UIView(UIConstraintBasedLayout) addConstraints:_block_invoke + 19710 Founda

20、tion 0x00000001058f23d3 -NSISEngine withBehaviors:performModifications: + 15511 UIKit0x0000000106626577 -UIView(UIConstraintBasedLayout)_withAutomaticEngineOptimizationDisabled: + 5812UIKit0x0000000106627348 -UIView(UIConstraintBasedLayout)addConstraints: + 37913UIKit0x00000001066b5531 -UIInputWindo

21、wControllerupdateViewConstraints + 355814UIKit0x00000001066b1fde -UIInputSetHostView_didChangeKeyplaneWithContext: + 22415UIKit0x000000010650f1cc -_UIKBCompatInputView_didChangeKeyplaneWithContext: + 87 16 UIKit0x0000000106004397 -UIKeyboard_didChangeKeyplaneWithContext: + 324 17 UIKit0x0000000105fe7b04 -UIKeyboardImpl_didChangeKeyplaneWithContext: + 110018 UIKit 0x000000010620d5a3-UIKeyboardLayoutStar(UIKeyboardLayoutJapanese50OnFlick) _didChangeKeyplaneWithContext: + 18319 UIKit0x00000001061f121e -UIKeyboardLayoutStar setKeyp