向 epub ios 应用程序添加滑动手势

Question

所以我正在使用基于 epub 阅读器应用程序的代码，并尝试对其进行修改以使滑动手势起作用。我只需要左右手势来向前或向后更改页面，并检查 epub 的结束或开始。我已经确定了切换页面的代码，并将它们附加到调用 java 脚本的下一个和上一个按钮功能以执行此操作。加载java脚本和WKWebView的函数在函数- (void)loadView下面，我的尝试是已经注释掉的*UISwipeGestureRecognizer声明。

- (void)loadView {
    self.view = [[UIView alloc] init];
    self.view.backgroundColor = [UIColor whiteColor];
// Notifications

NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];

[nc addObserver:self selector:@selector(onEPubSettingsDidChange:)
    name:kSDKLauncherEPubSettingsDidChange object:nil];

// Create the web view. The choice of web view type is based on the existence of the WKWebView
// class, but this could be decided some other way.

// The "no optimize" RequireJS option means that the entire "readium-shared-js" folder must be copied in to the OSX app bundle's "scripts" folder! (including "node_modules" subfolder, which is populated when invoking the "npm run prepare" build command) There is therefore some significant filesystem / size overhead, but the benefits are significant too: no need for the WebView to fetch sourcemaps, and to attempt to un-mangle the obfuscated Javascript during debugging.
// However, the recommended development-time pattern is to invoke "npm run build" in order to refresh the "build-output" folder, with the RJS_UGLY environment variable set to "false" or "no". This way, the RequireJS single/multiple bundle(s) will be in readable uncompressed form.
//NSString* readerFileName = @"reader_RequireJS-no-optimize.html";

//NSString* readerFileName = @"reader_RequireJS-multiple-bundles.html";
NSString* readerFileName = @"reader_RequireJS-single-bundle.html";


if ([WKWebView class] != nil) {
    WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
    config.allowsInlineMediaPlayback = YES;
    config.mediaPlaybackRequiresUserAction = NO;
    // Configure a "readium" message handler, which is used by host_app_feedback.js.

    WKUserContentController *contentController = [[WKUserContentController alloc] init];
    [contentController addScriptMessageHandler:self name:@"readium"];
    config.userContentController = contentController;

    WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:config];
    m_webViewWK = webView;
    webView.hidden = YES;
    webView.scrollView.bounces = NO;
    webView.allowsBackForwardNavigationGestures = YES;
    [self.view addSubview:webView];

    // RDPackageResourceConnection looks at corePaths and corePrefixes in the following
    // query string to determine what core resources it should provide responses for. Since
    // WKWebView can't handle file URLs, the web server must provide these resources.

    NSString *url = [NSString stringWithFormat:
        @"%@%@?"
        @"corePaths=readium-shared-js_all.js,readium-shared-js_all.js.map,epubReadingSystem.js,host_app_feedback.js,sdk.css&"
        @"corePrefixes=readium-shared-js",
        m_package.rootURL,
        readerFileName];

    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:url]]];

    //attempted swipe gestures, maybe create seperate function not sure if this is the best method
   /*UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self  action:@selector(swipeRightAction:)];
    swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
    swipeRight.delegate = self.view;
    [webView addGestureRecognizer:swipeRight];

    UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeftAction:)];
    swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
    swipeLeft.delegate = self.view;
    [webView addGestureRecognizer:swipeLeft];/*

}
else {
    UIWebView *webView = [[UIWebView alloc] init];
    m_webViewUI = webView;
    webView.delegate = self;
    webView.hidden = YES;
    webView.scalesPageToFit = YES;
    webView.scrollView.bounces = NO;
    webView.allowsInlineMediaPlayback = YES;
    webView.mediaPlaybackRequiresUserAction = NO;
    [self.view addSubview:webView];

    NSURL *url = [[NSBundle mainBundle] URLForResource:readerFileName withExtension:nil];
    [webView loadRequest:[NSURLRequest requestWithURL:url]];

    //attempted swipe gestures, maybe create seperate function
    /*UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self  action:@selector(swipeRightAction:)];
    swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
    //swipeRight.delegate = self;
    [webView addGestureRecognizer:swipeRight];

    UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeftAction:)];
    swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
    //swipeLeft.delegate = self;
    [webView addGestureRecognizer:swipeLeft];*/

}
}

非常感谢任何帮助，我已经向原始开发人员寻求帮助，但他们还没有回复。我以为我会得到别人的意见。

谢谢

Answer 1

找到了解决办法。我在UIWebview 和WKWebview 上使用了UISwipeGestureRecogniser 授权滑动操作，然后我创建了处理这些操作的函数。尽管此代码特定于此框架，但它可能与某人有关。我的代码如下：

-(void) viewDidLoad{
    [super viewDidLoad];
    UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self  action:@selector(swipeRightAction:)];
    //swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
    [swipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
    //swipeRight.delegate = self;
    [m_webViewUI addGestureRecognizer:swipeRight];
    [m_webViewWK addGestureRecognizer:swipeRight];



 UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeftAction:)];
    //swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
    [swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
    //swipeLeft.delegate = self;
    [m_webViewUI addGestureRecognizer:swipeLeft];
    [m_webViewWK addGestureRecognizer:swipeLeft];}

然后我将后退和前进手势映射到翻页：

-(void)swipeLeftAction:(UISwipeGestureRecognizer *) swipe{
[self executeJavaScript:@"ReadiumSDK.reader.openPageNext()" completionHandler:nil];
 NSLog(@"%s","Swipe Left");}

-(void)swipeRightAction:(UISwipeGestureRecognizer *) swipe{
    [self executeJavaScript:@"ReadiumSDK.reader.openPagePrev()" completionHandler:nil];
    NSLog(@"%s","Swipe Right");

边界检查由框架 java 脚本处理。