请适配下flutter 3.0.1

[vance-liu]

Describe the bug
非常感谢你们开源这么棒的项目！
不过我在升级flutter 3.0.1 时，遇到一些报错，请适配下。

To Reproduce
Steps to reproduce the behavior:
···
WidgetsBinding.instance!.addObserver(this);

SchedulerBinding.instance!.addPostFrameCallback((Duration timeStamp) {

PaintingBinding.instance!.imageCache!.evict(key);
···

Expected behavior

Screenshots

Versions (please complete the following information):

• latest

Additional context

[wongkoo]

已确认 flutter 3 下可正常运行 example。
请确认下，power_image_ext 是否已对应修改为 3.0.0
如果还是不行，请详细贴一下报错信息 与 flutter doctor，谢谢

[vance-liu]

power_image/lib/src/common/power_image_loader.dart

Line 197 in e020ca5

SchedulerBinding.instance!.addPostFrameCallback((Duration timeStamp) {

power_image/lib/src/common/power_image_provider.dart

Line 62 in e020ca5

PaintingBinding.instance!.imageCache!.evict(key);

power_image/lib/src/common/power_image_provider.dart

Line 83 in e020ca5

PaintingBinding.instance!.imageCache!.evict(key);

flutter doctor

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.0.1, on macOS 12.3.1 21E258 darwin-x64, locale
    zh-Hans-CN)
[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 13.4.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.2)
[✓] Android Studio (version 2021.2)
[✓] IntelliJ IDEA Community Edition (version 2022.1.2)
[✓] IntelliJ IDEA Community Edition (version 2022.1.1)
[✓] VS Code (version 1.67.2)
[✓] Connected device (2 available)
[✓] HTTP Host Availability

• No issues found!

@wongkoo

[wongkoo]

@vance-liu 请问下错误信息是什么，你只是引用了三段代码😓

[vance-liu]

@wongkoo 你试试就知道了，把感叹号去掉就行。

[wongkoo]

@wongkoo 你试试就知道了，把感叹号去掉就行。

The '!' will have no effect because the receiver can't be null. Documentation Try removing the '!' operator.

是指这个 warning 吗，看起来不影响运行。

由于当前分支同时支持3.0前后的版本，因此暂时不好去掉，我想一下该如何处理。