这样做的主要原因是我们必须覆盖主要第一响应者的canPerformAction.从控制器调用[[[UIApplication sharedApplication] keyWindow] performSelector：@selector(firstResponder)]会通知我们UIWebBrowserView是实际的主要第一响应者.我们想要子类化UIWebBrowserView,但由于它是私有类,我们可能会在审核过程中拒绝Apple拒绝我们的应用程序.来自@Shayan RC的This answer建议执行一个方法调整以允许重写此方法而无需子类化UIWebBrowserView(从而防止App Store拒绝).

解决方案

我们的想法是添加一个替代canPerformAction的新方法.我创建了一个包含我们想要保留在菜单中的所有方法签名的数组.要删除样式选项,我们只需要将@“_ showTextStyleOptions：”添加到此数组中.添加要显示的所有其他方法签名(我已添加了签名的NSLog,以便您可以选择所需的方法签名).

- (BOOL) mightPerformAction:(SEL)action withSender:(id)sender {
    NSLog(@"action : %@",NSStringFromSelector(action));
 
    NSArray<NSString*> *selectorsToKeep = @[@"cut:",@"copy:",@"select:",@"selectAll:",@"_lookup:"]; //add in this array every action you want to keep
    if ([selectorsToKeep containsObject:NSStringFromSelector(action)]) {
        return YES;
    }
 
    return NO;
}

现在我们可以使用以下方法(来自@Shayan RC的答案)执行方法调配来调用前一个方法而不是canPerformAction.这将需要添加#import< objc / runtime.h>.

- (void) replaceUIWebBrowserView: (UIView *)view {
    //Iterate through subviews recursively looking for UIWebBrowserView
    for (UIView *sub in view.subviews) {
        [self replaceUIWebBrowserView:sub];
        if ([NSStringFromClass([sub class]) isEqualToString:@"UIWebBrowserView"]) {
            Class class = sub.class;
 
            SEL originalSelector = @selector(canPerformAction:withSender:);
            SEL swizzledSelector = @selector(mightPerformAction:withSender:);
 
            Method originalMethod = class_getInstanceMethod(class,originalSelector);
            Method swizzledMethod = class_getInstanceMethod(self.class,swizzledSelector);
 
            //add the method mightPerformAction:withSender: to UIWebBrowserView
            BOOL didAddMethod =
            class_addMethod(class,originalSelector,method_getImplementation(swizzledMethod),method_getTypeEncoding(swizzledMethod));
            //replace canPerformAction:withSender: with mightPerformAction:withSender:
            if (didAddMethod) {
                class_replaceMethod(class,swizzledSelector,method_getImplementation(originalMethod),method_getTypeEncoding(originalMethod));
            } else {
                method_exchangeImplementations(originalMethod,swizzledMethod);
            }
        }
    }
}

最后,在viewDidLoad中调用prevIoUs方法,如下所示：[self replaceUIWebBrowserView：_webView].

方法调整似乎很难,但它允许您将代码保存在视图控制器中.如果您在实施以前的代码时遇到任何困难,请告诉我.

注意：使用WKWebView比使用UIWebView更容易实现此行为,并且不推荐使用UIWebView,您应该考虑切换到WKWebView.