[share] Sharing image to WhatsApp takes a long time in iOS

[leonardocustodio]

Hi,

I use the Share plugin and I noticed that when sharing images to whatsapp on iOS the UIActivityViewController gets kind of "frozen" for some seconds until whatsapp appear. This process takes a little bit too much time and the users thinks that the app crashed.

For some reason, this doesn't happen to all apps. For example, sharing to Messages, Mail, Facebook is fast.
But some apps like: WhatsApp, Spark and others are slow.

But why am I reporting this? Well, the process is way slower on apps that were made with flutter than on other apps.

I tried both sending the original files (png/jpg/heic) as well as only jpg converted version and still it takes too much time to be acceptable. Also, this only happens on flutter apps. If I go to other apps, even when sharing the same pics it is way faster.

I pretty much tried every plugin on pub.dev and all have the same problem so I maybe it is not plugin related but flutter related.

I'm using the latest stable version and I've been testing this on a iPhone Xs Max (but a lot of iOS users complain about it):

[√] Flutter (Channel stable, 1.22.4, on Microsoft Windows [Version 10.0.20257.1], locale pt-BR)
    • Flutter version 1.22.4 at C:\Users\leona\Documents\flutter
    • Framework revision 1aafb3a8b9 (3 hours ago), 2020-11-13 09:59:28 -0800
    • Engine revision 2c956a31c0
    • Dart version 2.10.4

Here is a sample of sharing 15 photos:

Here are the same photos on an app that is not made in flutter, it takes less than half of the time:

Not sure if this is really flutter fault but I couldn't help noticed that all other native apps are way faster.

[TahaTesser]

Hi @leonardocustodio
I can reproduce the delay when sharing 5-6 image to Whastapp on iOS

Code Sample

https://pub.dev/packages/share/example

multiple flutter doctor -v

[✓] Flutter (Channel stable, 1.22.4, on macOS 11.0.1 20B29 darwin-x64, locale
    en-GB)
    • Flutter version 1.22.4 at /Users/tahatesser/Code/flutter_stable
    • Framework revision 1aafb3a8b9 (3 days ago), 2020-11-13 09:59:28 -0800
    • Engine revision 2c956a31c0
    • Dart version 2.10.4

 
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at /Users/tahatesser/Code/sdk
    • Platform android-30, build-tools 30.0.2
    • ANDROID_HOME = /Users/tahatesser/Code/sdk
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6915495)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.2)
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.2, Build version 12B45b
    • CocoaPods version 1.10.0

[!] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6915495)

[✓] VS Code (version 1.51.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.16.0

[✓] Connected device (1 available)
    • Taha’s iPhone (mobile) • 00008020-001059882212002E • ios • iOS 14.2

! Doctor found issues in 1 category.

[✓] Flutter (Channel master, 1.24.0-8.0.pre.252, on macOS 11.0.1 20B29
    darwin-x64, locale en-GB)
    • Flutter version 1.24.0-8.0.pre.252 at
      /Users/tahatesser/Code/flutter_master
    • Framework revision bf2c9dfc05 (30 hours ago), 2020-11-14 22:38:02 -0500
    • Engine revision 3e77d854a7
    • Dart version 2.12.0 (build 2.12.0-45.0.dev)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at /Users/tahatesser/Code/sdk
    • Platform android-30, build-tools 30.0.2
    • ANDROID_HOME = /Users/tahatesser/Code/sdk
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6915495)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.2)
    • Xcode at /Volumes/Extreme/Xcode.app/Contents/Developer
    • Xcode 12.2, Build version 12B45b
    • CocoaPods version 1.10.0

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6915495)

[✓] VS Code (version 1.51.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.16.0

[✓] Connected device (5 available)
    • RMX2001 (mobile)     • EUYTFEUSQSRGDA6D          • android-arm64  •
      Android 10 (API 29)
    • Taha’s iPad (mobile) • 00008020-000255113EE8402E • ios            • iOS
      14.2
    • macOS (desktop)      • macos                     • darwin-x64     • macOS
      11.0.1 20B29 darwin-x64
    • Web Server (web)     • web-server                • web-javascript •
      Flutter Tools
    • Chrome (web)         • chrome                    • web-javascript • Google
      Chrome 86.0.4240.198

• No issues found!

[stuartmorgan-g]

Closing, as share is now deprecated in favor of share_plus.