以编程方式将焦点放在webview视图(WKWebView)中的窗体上
以编程方式将焦点放在webview视图(WKWebView)中的窗体上
提问于 2015-09-08 05:29:13
可以使用UIWebView实现以下功能：
[webView setKeyboardDisplayRequiresUserAction:NO]
Call some JS function当when视图改为WKWebView时，您如何做同样的事情？
回答 7
Stack Overflow用户
回答已采纳
发布于 2015-09-29 13:48:17
在深入研究Webkit源代码几周之后，通过在iOS上使用_startAssistingNode:userIsInteracting:blurPreviousNode:userObject并重写userIsInteracting值，我成功地在WKContentView上完成了这个工作：
伪码：
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!
Stack Overflow用户
发布于 2018-02-05 13:05:25
接受的答案在iOS 11.3中不再有效，因为WebKit方法签名已经更改。这里有一个解决办法(在Obj中)：
(UPDATE：方法签名在iOS 12.2和iOS 13中又更改了几次，下面的代码已经更新以反映这些更改)
#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);
}
}
@endStack Overflow用户
发布于 2017-09-04 01:20:30
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(在Swift 4中用于WKWebView类，它将keyboardDisplayRequiresUserAction添加为计算属性，就像在UIWebView中一样)。
在参考了苹果为WebKit提供的官方开源文档之后，我想出了下面的运行时swizzling：
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)
}
}
}一定要像这样调用WKWebView上的属性，
let webView = WKWebView()
webView.keyboardDisplayRequiresUserAction = false另外，确保您的HTML TextArea元素将AutoFocus设置为AutoFocus，否则将无法工作。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/32449870
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