If the CSS styles in your Ionic app appear to be off when deployed to iOS but are fine everywhere else, there are a few common issues and solutions you can explore:

  1. CSS Vendor Prefixes: Some CSS styles may require vendor prefixes for specific browsers, and these prefixes might not be applied correctly on iOS. Make sure to use the appropriate vendor prefixes for CSS properties that require them. You can use tools like Autoprefixer to automatically add vendor prefixes during your build process.

  2. Check Webview Differences: The iOS webview used by the Ionic app may behave slightly differently from other web browsers. Different webviews have varying levels of support for CSS features, and this can lead to visual differences. You can try to use a webview plugin like cordova-plugin-wkwebview-engine to replace the default webview and potentially improve consistency across platforms.

  3. Font Loading: Check if the fonts used in your app are being loaded correctly on iOS. Different font formats and file paths may be required for different platforms. Make sure that the font files are included and properly referenced in your CSS files.

  4. Testing on iOS Simulator/Device: Make sure you are testing your Ionic app on an actual iOS device or the iOS simulator. Emulators and simulators might not always perfectly replicate the behavior of real devices. Also, consider testing on different iOS versions to identify any version-specific issues.

  5. iOS Dark Mode: If your app uses dark mode, check if the styles for dark mode are being applied correctly on iOS. iOS has a built-in dark mode feature, and you may need to adjust your CSS to support it properly.

  6. Media Queries: Ensure that your media queries are written correctly and cover the appropriate screen sizes and device orientations. Sometimes, incorrect or incomplete media queries can cause layout issues on specific devices.

  7. Viewport Meta Tag: Double-check the viewport meta tag in your HTML's head section to make sure it is properly configured. It should set the initial scale and width for the viewport to ensure consistent rendering across devices.

  8. Hardware Acceleration: Certain CSS properties may behave differently when hardware acceleration is enabled or disabled. You can try enabling hardware acceleration using the CSS transform property and its translateZ(0) value for certain elements.

  9. Inspecting the App: Use Safari Web Inspector to inspect your app when running on iOS. This can help you identify any rendering issues, layout problems, or specific CSS rules that are causing the visual discrepancies.

Remember to test your app on different iOS devices and versions to ensure broad compatibility. Addressing these potential issues can help you achieve a more consistent appearance of your Ionic app on iOS.

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