Xamarin iOS应用因PlayVideo类无默认无参构造函数遭苹果拒审求助

Hey there, let's tackle this issue head-on—even though your app compiles fine, that missing parameterless constructor is almost certainly the culprit behind Apple's rejection. Here's why and how to fix it:

Why this causes rejection #

Even if the app builds successfully, Xamarin.Forms relies on parameterless constructors to instantiate XAML pages at runtime. When Apple's review team navigates to your PlayVideo page, the app tries to create an instance of it but fails without that constructor, leading to a crash. Apple's testing (automated or manual) picks up this crash and rejects the app as a result.

How to fix it #

You need to add a parameterless constructor to your PlayVideo class, and it must call InitializeComponent() (as the error message explicitly suggests). Here's exactly what to implement:

1. Open your PlayVideo.xaml.cs file
2. Add the parameterless constructor alongside any existing constructors you have:

namespace Y4P.Views
{
    public partial class PlayVideo : ContentPage
    {
        // Required parameterless constructor for XAML parsing and runtime instantiation
        public PlayVideo()
        {
            InitializeComponent();
        }

        // Keep your existing parameterized constructor if you need it
        public PlayVideo(/* Your existing parameters here */) : this()
        {
            // Your existing initialization logic for the parameterized case goes here
        }
    }
}

Important checks after fixing #

• Verify XAML preview: Open your PlayVideo.xaml file— the preview should now load without errors, confirming the constructor is set up correctly.
• Test runtime behavior: Navigate to the PlayVideo page in an iOS simulator or physical device to ensure no crashes occur. Pay extra attention to all paths that lead to this page (like button taps, navigation links, etc.).
• Re-submit for review: Once you've confirmed the fix works, rebuild your app and submit it to Apple again. This should resolve the rejection issue.

内容的提问来源于stack exchange，提问作者user2029541