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在Web视图（WKWebView）中以编程方式聚焦于表单

ioswebview
25
7个回答
32

接受的答案在iOS 11.3中已不再适用，因为WebKit方法签名已更改。这里是一个解决办法（使用Obj-C）：

（更新：在iOS 12.2和iOS 13中，方法签名又改变了几次，下面的代码已经更新以反映这些变化）

#import <objc/runtime.h>

@implementation WebViewInjection

+ (void)allowDisplayingKeyboardWithoutUserAction {
    Class class = NSClassFromString(@"WKContentView");
    NSOperatingSystemVersion iOS_11_3_0 = (NSOperatingSystemVersion){11, 3, 0};
    NSOperatingSystemVersion iOS_12_2_0 = (NSOperatingSystemVersion){12, 2, 0};
    NSOperatingSystemVersion iOS_13_0_0 = (NSOperatingSystemVersion){13, 0, 0};
    if ([[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion: iOS_13_0_0]) {
        SEL selector = sel_getUid("_elementDidFocus:userIsInteracting:blurPreviousNode:activityStateChanges:userObject:");
        Method method = class_getInstanceMethod(class, selector);
        IMP original = method_getImplementation(method);
        IMP override = imp_implementationWithBlock(^void(id me, void* arg0, BOOL arg1, BOOL arg2, BOOL arg3, id arg4) {
        ((void (*)(id, SEL, void*, BOOL, BOOL, BOOL, id))original)(me, selector, arg0, TRUE, arg2, arg3, arg4);
        });
        method_setImplementation(method, override);
    }
   else if ([[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion: iOS_12_2_0]) {
        SEL selector = sel_getUid("_elementDidFocus:userIsInteracting:blurPreviousNode:changingActivityState:userObject:");
        Method method = class_getInstanceMethod(class, selector);
        IMP original = method_getImplementation(method);
        IMP override = imp_implementationWithBlock(^void(id me, void* arg0, BOOL arg1, BOOL arg2, BOOL arg3, id arg4) {
        ((void (*)(id, SEL, void*, BOOL, BOOL, BOOL, id))original)(me, selector, arg0, TRUE, arg2, arg3, arg4);
        });
        method_setImplementation(method, override);
    }
    else if ([[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion: iOS_11_3_0]) {
        SEL selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:changingActivityState:userObject:");
        Method method = class_getInstanceMethod(class, selector);
        IMP original = method_getImplementation(method);
        IMP override = imp_implementationWithBlock(^void(id me, void* arg0, BOOL arg1, BOOL arg2, BOOL arg3, id arg4) {
            ((void (*)(id, SEL, void*, BOOL, BOOL, BOOL, id))original)(me, selector, arg0, TRUE, arg2, arg3, arg4);
        });
        method_setImplementation(method, override);
    } else {
        SEL selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:userObject:");
        Method method = class_getInstanceMethod(class, selector);
        IMP original = method_getImplementation(method);
        IMP override = imp_implementationWithBlock(^void(id me, void* arg0, BOOL arg1, BOOL arg2, id arg3) {
            ((void (*)(id, SEL, void*, BOOL, BOOL, id))original)(me, selector, arg0, TRUE, arg2, arg3);
        });
        method_setImplementation(method, override);
    }
}

@end
谢谢！我一直在试图弄清楚这个问题。如果您不介意的话，能否解释一下，您是如何解决这个问题的？ - Chet
4
有多少使用这种解决方案的应用被AppStore接受了？由于没有任何废弃警告就进行了破坏，我猜想这不应该以这种方式使用。我是唯一一个担心使用这段代码的人吗？ - wrtsprt
@wrtsprt 我的应用程序通过了这个解决方法，苹果目前还没有对此提出任何异议。每次我提交更新时都是如此。 - thomasdao
@AlexStaravoitau 好的，但是你如何确定新方法签名呢？（我真的很想学习） - gx14
2
由于此问题已得到修复，@Hirbod的inputfocusfix插件已被弃用，因为更改已合并到主要的wkwebview存储库中。但是，iOS 13的修复尚未完成，因此在此之前我们不得不重新恢复该修复。我在这里进行了操作：https://github.com/adaptabi/cordova-plugin-wkwebview-inputfocusfix - Teodor Sandu
显示剩余6条评论
29
更新：此解决方案适用于iOS 13.0、12.2、11.*和10.*，也适用于iPadOS 13.1。
我编写了一个扩展（使用Swift 4为WKWebView类），添加了一个计算属性keyboardDisplayRequiresUserAction，就像在UIWebView中一样。
在参考苹果官方开源文档WebKit后，我想到了以下运行时方法交换：
import Foundation
import WebKit

typealias OldClosureType =  @convention(c) (Any, Selector, UnsafeRawPointer, Bool, Bool, Any?) -> Void
typealias NewClosureType =  @convention(c) (Any, Selector, UnsafeRawPointer, Bool, Bool, Bool, Any?) -> Void

extension WKWebView{
    var keyboardDisplayRequiresUserAction: Bool? {
        get {
            return self.keyboardDisplayRequiresUserAction
        }
        set {
            self.setKeyboardRequiresUserInteraction(newValue ?? true)
        }
    }

    func setKeyboardRequiresUserInteraction( _ value: Bool) {
        guard let WKContentView: AnyClass = NSClassFromString("WKContentView") else {
            print("keyboardDisplayRequiresUserAction extension: Cannot find the WKContentView class")
            return
        }
        // For iOS 10, *
        let sel_10: Selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:userObject:")
        // For iOS 11.3, *
        let sel_11_3: Selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:changingActivityState:userObject:")
        // For iOS 12.2, *
        let sel_12_2: Selector = sel_getUid("_elementDidFocus:userIsInteracting:blurPreviousNode:changingActivityState:userObject:")
        // For iOS 13.0, *
        let sel_13_0: Selector = sel_getUid("_elementDidFocus:userIsInteracting:blurPreviousNode:activityStateChanges:userObject:")

        if let method = class_getInstanceMethod(WKContentView, sel_10) {
            let originalImp: IMP = method_getImplementation(method)
            let original: OldClosureType = unsafeBitCast(originalImp, to: OldClosureType.self)
            let block : @convention(block) (Any, UnsafeRawPointer, Bool, Bool, Any?) -> Void = { (me, arg0, arg1, arg2, arg3) in
                original(me, sel_10, arg0, !value, arg2, arg3)
            }
            let imp: IMP = imp_implementationWithBlock(block)
            method_setImplementation(method, imp)
        }

        if let method = class_getInstanceMethod(WKContentView, sel_11_3) {
            let originalImp: IMP = method_getImplementation(method)
            let original: NewClosureType = unsafeBitCast(originalImp, to: NewClosureType.self)
            let block : @convention(block) (Any, UnsafeRawPointer, Bool, Bool, Bool, Any?) -> Void = { (me, arg0, arg1, arg2, arg3, arg4) in
                original(me, sel_11_3, arg0, !value, arg2, arg3, arg4)
            }
            let imp: IMP = imp_implementationWithBlock(block)
            method_setImplementation(method, imp)
        }

        if let method = class_getInstanceMethod(WKContentView, sel_12_2) {
            let originalImp: IMP = method_getImplementation(method)
            let original: NewClosureType = unsafeBitCast(originalImp, to: NewClosureType.self)
            let block : @convention(block) (Any, UnsafeRawPointer, Bool, Bool, Bool, Any?) -> Void = { (me, arg0, arg1, arg2, arg3, arg4) in
                original(me, sel_12_2, arg0, !value, arg2, arg3, arg4)
            }
            let imp: IMP = imp_implementationWithBlock(block)
            method_setImplementation(method, imp)
        }

        if let method = class_getInstanceMethod(WKContentView, sel_13_0) {
            let originalImp: IMP = method_getImplementation(method)
            let original: NewClosureType = unsafeBitCast(originalImp, to: NewClosureType.self)
            let block : @convention(block) (Any, UnsafeRawPointer, Bool, Bool, Bool, Any?) -> Void = { (me, arg0, arg1, arg2, arg3, arg4) in
                original(me, sel_13_0, arg0, !value, arg2, arg3, arg4)
            }
            let imp: IMP = imp_implementationWithBlock(block)
            method_setImplementation(method, imp)
        }
    }
}

请确保像这样在您的 WKWebView 上调用 property：

let webView = WKWebView()
webView.keyboardDisplayRequiresUserAction = false

另外，请确保您的 HTML TextArea 元素 已将 AutoFocus 设置为true，否则此操作将无法正常工作。

1
至少在iOS 10和11中，这根本不起作用。 - kevin
@kevin 更新了答案以支持最新的iOS版本，即12.2、11.*和10.*。 - Pranit Harekar
4
Xcode 不喜欢这个 getter，因为“所有通往此函数的路径都将调用它本身”。 - Mr Rogers
@MrRogers，所有的内容都可以在最新的Xcode中编译通过，只要你移除keyboardDisplayRequiresUserAction变量即可。这个变量只有在你想读取状态时才是必需的。 - Jon
9

这个Swift扩展可以完成任务，与11.3以及早期的点发行版兼容。

import Foundation
import WebKit

typealias OlderClosureType =  @convention(c) (Any, Selector, UnsafeRawPointer, Bool, Bool, Any?) -> Void
typealias NewerClosureType =  @convention(c) (Any, Selector, UnsafeRawPointer, Bool, Bool, Bool, Any?) -> Void

extension WKWebView{

    var keyboardDisplayRequiresUserAction: Bool? {
        get {
            return self.keyboardDisplayRequiresUserAction
        }
        set {
            self.setKeyboardRequiresUserInteraction(newValue ?? true)
        }
    }

    func setKeyboardRequiresUserInteraction( _ value: Bool) {

        guard
            let WKContentViewClass: AnyClass = NSClassFromString("WKContentView") else {
                print("Cannot find the WKContentView class")
                return
        }

        let olderSelector: Selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:userObject:")
        let newerSelector: Selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:changingActivityState:userObject:")

        if let method = class_getInstanceMethod(WKContentViewClass, olderSelector) {

            let originalImp: IMP = method_getImplementation(method)
            let original: OlderClosureType = unsafeBitCast(originalImp, to: OlderClosureType.self)
            let block : @convention(block) (Any, UnsafeRawPointer, Bool, Bool, Any?) -> Void = { (me, arg0, arg1, arg2, arg3) in
                original(me, olderSelector, arg0, !value, arg2, arg3)
            }
            let imp: IMP = imp_implementationWithBlock(block)
            method_setImplementation(method, imp)
        }

        if let method = class_getInstanceMethod(WKContentViewClass, newerSelector) {

            let originalImp: IMP = method_getImplementation(method)
            let original: NewerClosureType = unsafeBitCast(originalImp, to: NewerClosureType.self)
            let block : @convention(block) (Any, UnsafeRawPointer, Bool, Bool, Bool, Any?) -> Void = { (me, arg0, arg1, arg2, arg3, arg4) in
                original(me, newerSelector, arg0, !value, arg2, arg3, arg4)
            }
            let imp: IMP = imp_implementationWithBlock(block)
            method_setImplementation(method, imp)
        }

    }

}
这个检查针对运行时获取选择器，但编译时使用的基础SDK破坏了旧的方式。我有一个使用11.3基础SDK编译的应用程序，在早于11.3的设备上运行会无法获取新的选择器，但在旧设备上会崩溃。 - kevin
6

经过几周挖掘Webkit源代码后，我成功地在iOS 9上通过swizzling WKContentView的_startAssistingNode：userIsInteracting：blurPreviousNode：userObject并覆盖userIsInteracting值来实现此功能：

伪代码:

swizzle_intercept("WKContentView", "_startAssistingNode:userIsInteracting:blurPreviousNode:userObject:", &hackAssist);

void hackAssist (id self, SEL _cmd, void* arg0, BOOL arg1, BOOL arg2, id arg3) {
    ((void (*)(id,SEL,void*,BOOL,BOOL,id))swizzle_interceptee(hackAssist))(self, _cmd, arg0, TRUE, arg2, arg3);
}

干杯!

Swift 的等价物呢？ - Osvaldas
在iOS 10上，这会导致键盘出现，有什么想法为什么会这样？ - Paulo Cesar
@PauloCesar 你最近的测试版还有这个问题吗？ - Emiel Mols
Cordova的修复程序在此处：https://github.com/adaptabi/cordova-plugin-wkwebview-inputfocusfix - Teodor Sandu
5

iOS 13更新，方法再次更改：

Objective-C

#import <objc/runtime.h>

@implementation WebViewInjection

+ (void)allowDisplayingKeyboardWithoutUserAction {
    Class class = NSClassFromString(@"WKContentView");
    NSOperatingSystemVersion iOS_11_3_0 = (NSOperatingSystemVersion){11, 3, 0};
    NSOperatingSystemVersion iOS_12_2_0 = (NSOperatingSystemVersion){12, 2, 0};
    NSOperatingSystemVersion iOS_13_0_0 = (NSOperatingSystemVersion){13, 0, 0};
    char * methodSignature = "_startAssistingNode:userIsInteracting:blurPreviousNode:changingActivityState:userObject:";

    if ([[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion: iOS_13_0_0]) {
        methodSignature = "_elementDidFocus:userIsInteracting:blurPreviousNode:activityStateChanges:userObject:";
    } else if ([[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion: iOS_12_2_0]) {
        methodSignature = "_elementDidFocus:userIsInteracting:blurPreviousNode:changingActivityState:userObject:";
    }

    if ([[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion: iOS_11_3_0]) {
        SEL selector = sel_getUid(methodSignature);
        Method method = class_getInstanceMethod(class, selector);
        IMP original = method_getImplementation(method);
        IMP override = imp_implementationWithBlock(^void(id me, void* arg0, BOOL arg1, BOOL arg2, BOOL arg3, id arg4) {
            ((void (*)(id, SEL, void*, BOOL, BOOL, BOOL, id))original)(me, selector, arg0, TRUE, arg2, arg3, arg4);
        });
        method_setImplementation(method, override);
    } else {
        SEL selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:userObject:");
        Method method = class_getInstanceMethod(class, selector);
        IMP original = method_getImplementation(method);
        IMP override = imp_implementationWithBlock(^void(id me, void* arg0, BOOL arg1, BOOL arg2, id arg3) {
            ((void (*)(id, SEL, void*, BOOL, BOOL, id))original)(me, selector, arg0, TRUE, arg2, arg3);
        });
        method_setImplementation(method, override);
    }
}

@end

Swift:

    func setKeyboardRequiresUserInteraction( _ value: Bool) {

        guard
            let WKContentViewClass: AnyClass = NSClassFromString("WKContentView") else {
                print("Cannot find the WKContentView class")
                return
        }

        let olderSelector: Selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:userObject:")
        let newSelector: Selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:changingActivityState:userObject:")
        let newerSelector: Selector = sel_getUid("_elementDidFocus:userIsInteracting:blurPreviousNode:changingActivityState:userObject:")
        let ios13Selector: Selector = sel_getUid("_elementDidFocus:userIsInteracting:blurPreviousNode:activityStateChanges:userObject:")

        if let method = class_getInstanceMethod(WKContentViewClass, olderSelector) {

            let originalImp: IMP = method_getImplementation(method)
            let original: OlderClosureType = unsafeBitCast(originalImp, to: OlderClosureType.self)
            let block : @convention(block) (Any, UnsafeRawPointer, Bool, Bool, Any?) -> Void = { (me, arg0, arg1, arg2, arg3) in
                original(me, olderSelector, arg0, !value, arg2, arg3)
            }
            let imp: IMP = imp_implementationWithBlock(block)
            method_setImplementation(method, imp)
        }

        if let method = class_getInstanceMethod(wkc, newSelector) {
            self.swizzleAutofocusMethod(method, newSelector, value)
        }

        if let method = class_getInstanceMethod(wkc, newerSelector) {
            self.swizzleAutofocusMethod(method, newerSelector, value)
        }

        if let method = class_getInstanceMethod(wkc, ios13Selector) {
            self.swizzleAutofocusMethod(method, ios13Selector, value)
        }
    }

    func swizzleAutofocusMethod(_ method: Method, _ selector: Selector, _ value: Bool) {
        let originalImp: IMP = method_getImplementation(method)
        let original: NewClosureType = unsafeBitCast(originalImp, to: NewClosureType.self)
        let block : @convention(block) (Any, UnsafeRawPointer, Bool, Bool, Bool, Any?) -> Void = { (me, arg0, arg1, arg2, arg3, arg4) in
            original(me, selector, arg0, !value, arg2, arg3, arg4)
        }
        let imp: IMP = imp_implementationWithBlock(block)
        method_setImplementation(method, imp)
   }
这个方法在13.0版本中可用，但在13.6版本中不可用。需要更新此方法以支持13.6吗？ - Harsh Sharma
你是用的哪个，Swift 还是 Objective-C？在 13.6.1 和 14 beta 6 上似乎都能正常工作。 - jcesarmobile
我正在使用Objective-C，但它对我不起作用。我正在使用带有13.6版本和14 beta的iPad。 - Harsh Sharma
你好jcesarmobile，能否告诉一下没有经验的Xcode开发者我们应该把这段代码放在哪里？我正在使用一个基本的Cordova项目，并且收到了警告“找不到'WebViewInjection'的接口声明”。谢谢 :) - Louis LC
WebViewInjection是类名，应该与您放置代码的.m文件名称匹配。 - jcesarmobile
5

由于Swift 4.2在keyboardDisplayRequiresUserAction getter上给出了“所有路径通过此函数将调用自身”的警告，因此我不得不将@Mark的答案从扩展更改为子类。

import Foundation
import WebKit

typealias OldClosureType = @convention(c) (Any, Selector, UnsafeRawPointer, Bool, Bool, Any?) -> Void
typealias NewClosureType = @convention(c) (Any, Selector, UnsafeRawPointer, Bool, Bool, Bool, Any?) -> Void

class WebView: WKWebView {

    private var _keyboardDisplayRequiresUseraction = true

    var keyboardDisplayRequiresUserAction: Bool? {
        get {
            return _keyboardDisplayRequiresUseraction
        }
        set {
            _keyboardDisplayRequiresUseraction = newValue ?? true
            setKeyboardRequiresUserInteraction(_keyboardDisplayRequiresUseraction)
        }
    }

    private func setKeyboardRequiresUserInteraciton(_ value: Bool) {
        guard let WKContentViewClass: AnyClass = NSClassFromString("WKContentView") else {
            return print("Cannot find WKContentView class")
        }

        let oldSelector: Selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:userObject:")
        let newSelector: Selector = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:changingActivityState:userObject:")

        if let method = class_getInstanceMethod(WKContentViewClass, oldSelector) {
            let originalImp: IMP = method_getImplementation(method)
            let original: OldClosureType = unsafeBitCast(originalImp, to: OldClosureType.self)
            let block: @convention(block) (Any, UnsafeRawPointer, Bool, Bool, Any?) -> Void = { (me, arg0, arg1, arg2, arg3) in
                original(me, oldSelector, arg0, !value, arg2, arg3)
            }
            let imp: IMP = imp_implementationWithBlock(block)
            method_setImplementation(method, imp)
        }
        if let method = class_getInstanceMethod(WKContentViewClass, newSelector) {
            let originalImp: IMP = method_getImplementation(method)
            let original: NewClosureType = unsafeBitCast(originalImp, to: NewClosureType.self)
            let block: @convention(block) (Any, UnsafeRawPointer, Bool, Bool, Bool, Any?) -> Void = { (me, arg0, arg1, arg2, arg3, arg4) in
                original(me, newSelector, arg0, !value, arg2, arg3, arg4)
            }
            let imp: IMP = imp_implementationWithBlock(block)
            method_setImplementation(method, imp)
        }
    }
}

已在iOS 11.2和12.0上进行了测试。

1
非常好用，谢谢！请注意，在使用此功能时，您必须设置 myWebView.keyboardDisplayRequiresUserAction = true，因为它只在setter中初始化。 - Roben
0

针对@jcesarmobile的答案，该答案在以下平台上有效：iPhone SE 1 iOS 14.1，iPhone 6s plus iOS 14.4.2;

对于那些在第二次加载swizzled WKWebview中的内容时遇到跳跃或大小不匹配问题的人们，您可以通过以下示例避免上述混乱：

setTimeout(function(){
    document.getElementById("myTextElementId").focus();
},250);

/* 在挂载或 onload 方法中 */

思考：为什么第二次出现混乱？ 可能是这样的：WebView在第一次加载时缓存了CSS样式和文件，因此第二次加载内容速度更快；键盘直接弹出，同时窗口在进行尺寸适应、渲染等操作，所以会出现混乱；这就是我们需要延迟的原因。

你在真实设备上测试过吗？对我来说，在模拟器上它运行良好。但是在设备上，它不起作用。 - WildCat
该示例已在iPhone SE 1 iOS 14.1和iPhone 6s Plus iOS 14.4.2上进行了测试。 - nice2m
请确保您的延迟在 H5 中正常工作；测试环境为：iPhone12mini 14.5、iPhone SE 1 iOS 14.1、iPhone 6s plus iOS 14.4.2。 - nice2m
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