Cordova app not displaying correctly on iPhone X (Simulator)

Question 1

Cordova app not displaying correctly on iPhone X (Simulator)

ios cordova phonegap iphone-x

DaveAlden · Sep 15, 2017 · Viewed 97.8k times · Source

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I found the solution to the white bars here:

Set viewport-fit=cover on the viewport <meta> tag, i.e.:

<meta name="viewport" content="initial-scale=1, width=device-width, height=device-height, viewport-fit=cover">

The white bars in UIWebView then disappear:

The solution to remove the black areas (provided by @dpogue in a comment below) is to use LaunchStoryboard images with cordova-plugin-splashscreen to replace the legacy launch images, used by Cordova by default. To do so, add the following to the iOS platform in config.xml:

<platform name="ios">    
    <splash src="res/screen/ios/Default@2x~iphone~anyany.png" />
    <splash src="res/screen/ios/Default@2x~iphone~comany.png" />
    <splash src="res/screen/ios/Default@2x~iphone~comcom.png" />
    <splash src="res/screen/ios/Default@3x~iphone~anyany.png" />
    <splash src="res/screen/ios/Default@3x~iphone~anycom.png" />
    <splash src="res/screen/ios/Default@3x~iphone~comany.png" />
    <splash src="res/screen/ios/Default@2x~ipad~anyany.png" />
    <splash src="res/screen/ios/Default@2x~ipad~comany.png" />   

    <!-- more iOS config... -->
</platform>

Then create the images with the following dimensions in res/screen/ios (remove any existing ones):

Default@2x~iphone~anyany.png - 1334x1334
Default@2x~iphone~comany.png - 750x1334
Default@2x~iphone~comcom.png - 1334x750
Default@3x~iphone~anyany.png - 2208x2208
Default@3x~iphone~anycom.png - 2208x1242
Default@3x~iphone~comany.png - 1242x2208
Default@2x~ipad~anyany.png - 2732x2732
Default@2x~ipad~comany.png - 1278x2732

Once the black bars are removed, there's another thing that's different about the iPhone X to address: The status bar is larger than 20px due to the "notch", which means any content at the far top of your Cordova app will be obscured by it:

Rather than hard-coding a padding in pixels, you can handle this automatically in CSS using the new safe-area-inset-* constants in iOS 11.

Note: in iOS 11.0 the function to handle these constants was called constant() but in iOS 11.2 Apple renamed it to env() (see here), therefore to cover both cases you need to overload the CSS rule with both and rely on the CSS fallback mechanism to apply the appropriate one:

body{
    padding-top: constant(safe-area-inset-top);
    padding-top: env(safe-area-inset-top);
}

The result is then as desired: the app content covers the full screen, but is not obscured by the "notch":

I've created a Cordova test project which illustrates the above steps: webview-test.zip

Notes:

Footer buttons

If your app has footer buttons (as mine does), you will also need to apply safe-area-inset-bottom to avoid them being overlapped by the virtual Home button on iPhone X.
In my case, I couldn't apply this to <body> as the footer is absolutely positioned, so I needed to apply it directly to the footer:

.toolbar-footer{
    margin-bottom: constant(safe-area-inset-bottom);
    margin-bottom: env(safe-area-inset-bottom);
}

cordova-plugin-statusbar

The status bar size has changed on iPhone X, so older versions of cordova-plugin-statusbar display incorrectly on iPhone X
Mike Hartington has created this pull request which applies the necessary changes.
This was merged into the [email protected] release, so make sure you're using at least this version to apply to safe-area-insets

splashscreen

The LaunchScreen storyboard constraints changed on iOS 11/iPhone X, meaning the splashscreen appeared to "jump" on launch when using existing versions of the plugin (see here).
This was captured in bug report CB-13505, fixed PR cordova-ios#354 and released in [email protected], so make sure you're using a recent version of the cordova-ios platform.

device orientation

When using UIWebView on iOS 11.0, rotating from portrait > landscape > portrait causes the safe-area-inset not to be re-applied, causing the content to be obscured by the notch again (as highlighted by jms in a comment below).
Also happens if app is launched in landscape then rotated to portrait
This doesn't happen when using WKWebView via cordova-plugin-wkwebview-engine.
Radar report: http://www.openradar.me/radar?id=5035192880201728
Update: this appears to have been fixed in iOS 11.1

For reference, this is the original Cordova issue I opened which captures this: https://issues.apache.org/jira/browse/CB-13273

Question 2

I tested my Cordova-based app yesterday on the iPhone X Simulator in Xcode 9.0 (9A235) and it didn't look good. Firstly, instead of filling the full screen area, there was a black area above and below the app content. And worse, between the app content and the black was two white bars.

Adding cordova-plugin-wkwebview-engine so Cordova renders using WKWebView (not UIWebView) fixes the white bars. By my app is not migrated from UIWebView to WKWebView due to performance and memory leak issues when using cordova-plugin-wkwebview-engine which occur when loading images downloaded from Inapp Purchase hosted content into an HTML5 canvas (direct file:// access by the Webview is not possible due to security restrictions in WKWebView so the image data must be loaded via cordova-plugin-file).

These screenshots show a test app with a blue background set on the <body>. Above and below UIWebView, you can see the white bars, but not with WKWebView:

_{(source: pbrd.co)}

Both Cordova Webviews exhibit the black areas when compared to a native app which fills the full screen area:

Cordova app not displaying correctly on iPhone X (Simulator)

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