Black Screen after displaying root view controller, ONLY when inheriting PayPalPaymentDelegate

问题

The problem is that I get a black screen after the splash screen ONLY when a class that inherits the PayPalPaymentDelegate.

At the first I thought it was my PayPalMobile binding so I used this PayPalMobile binding by Alejandro. I got the same results by using his binding and mine.

I ran Alejandro sample app and it works flawlessly. I have no idea why I'm getting the black screen on mine.

What could be causing this issue on my project?

What I have done so far:

I changed the deployment target from 8.4 to 9.2 and the main interface from none to LoginViewController and received the same issue.

Made a new solution, added my PayPalMobile binding and it worked.

The root view controller does show before going to a black screen.

So, something is causing the issue within the solution which I can't figure out what.

Environment:

I'm using the latest PayPalMobile

Using Xamarin Studio 5.10.2

Using iPhone 6s 9.2 simulator

Info.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>CFBundleDisplayName</key>
    <string>Test</string>
    <key>CFBundleShortVersionString</key>
    <string>1.0</string>
    <key>CFBundleVersion</key>
    <string>1.0</string>
    <key>LSRequiresIPhoneOS</key>
    <true/>
    <key>MinimumOSVersion</key>
    <string>9.2</string>
    <key>UIDeviceFamily</key>
    <array>
        <integer>1</integer>
    </array>
    <key>UILaunchStoryboardName</key>
    <string>LaunchScreen</string>
    <key>UIRequiredDeviceCapabilities</key>
    <array>
        <string>armv7</string>
    </array>
    <key>UISupportedInterfaceOrientations</key>
    <array>
        <string>UIInterfaceOrientationPortrait</string>
    </array>
    <key>UIStatusBarStyle</key>
    <string>UIStatusBarStyleLightContent</string>
    <key>CFBundleIconFiles</key>
    <array>
        <string>Icon</string>
    </array>
    <key>UIBackgroundModes</key>
    <array>
        <string>location</string>
    </array>
    <key>CFBundleDocumentTypes</key>
    <array>
        <dict>
            <key>CFBundleTypeName</key>
            <string>MKDirectionsRequest</string>
            <key>LSItemContentTypes</key>
            <array>
                <string>com.apple.maps.directionsrequest</string>
            </array>
        </dict>
    </array>
    <key>MKDirectionsApplicationSupportedModes</key>
    <array>
        <string>MKDirectionsModeCar</string>
    </array>
    <key>XSLaunchImageAssets</key>
    <string>Resources/Images.xcassets/LaunchImage.launchimage</string>
    <key>CFBundleIdentifier</key>
    <string>email@yahoo.com</string>
    <key>UIMainNibFile</key>
    <string>LoginViewController</string>
</dict>
</plist>

回答1:

Check the info.plist file and see if your project have something missing

回答2:

Okay I found the problem.

In AppDelegate, I defined the UIWindow inside the FinishedLaunching() method.

Making the UIWindow class as override, fixed the problem.

In AppDelegate:

public partial class AppDelegate : UIApplicationDelegate 
{
    // This fixed the problem    
    public override UIWindow Window {
        get;
        set;
    }

    public override bool FinishedLaunching (UIApplication app, NSDictionary options)
    {    
        //This cause the black screen
        //UIWindow Window = new UIWindow (UIScreen.MainScreen.Bounds);
        Window = new UIWindow (UIScreen.MainScreen.Bounds);

        UINavigationController navController = 
                new UINavigationController (new ViewController ());
        Window.RootViewController = navController;
        Window.MakeKeyAndVisible();

        return true;
    }
}

来源：https://stackoverflow.com/questions/36539611/black-screen-after-displaying-root-view-controller-only-when-inheriting-paypalp