flutter共享engine

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flutter 共享引擎 问题记录

共享引擎，就是只有一个 flutter engine，每个页面一个 flutterviewcontroller。
flutter页面 切换，引擎会相应的 detach atach

最近 升级 flutter 到 v1.12.13 版本后，贡献引擎遇到的几个问题 记录下

present flutter 页面

这个其实不是v1.12.13出现的问题

flutterPageA present flutterPageB 会 出现 pageA的 viewDidDisappear 比 pageB的 viewDidAppear 后执行

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- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];
    //处理下present 页面卡死的情况
    if ([WD_FLUTTER_ENGINE flutterViewController] != self) {
        [WD_FLUTTER_ENGINE resume];
        [(WDFlutterViewContainer *)[WD_FLUTTER_ENGINE flutterViewController] surfaceUpdated:YES];
    } else {
      [WD_FLUTTER_ENGINE detach];
    }
}

从flutter 返回到 native页面

在 v.1.12.13之前 flutter popto native 无需处理
v.1.12.13 出现crash 

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[VERBOSE-2:FlutterObservatoryPublisher.mm(131)] Could not register as server for FlutterObservatoryPublisher. Check your network settings and relaunch the application.
SCNetworkReachabilitySetDispatchQueue() failed: Invalid argument
SCNetworkReachabilitySetDispatchQueue() failed: Invalid argument
localConnectionInitializedStatus:2
localConnectionInitializedStatus:2
SCNetworkReachabilitySetDispatchQueue() failed: Invalid argument
[Bugly] Fatal signal(11) raised.
[Bugly]  Trapped fatal signal 'SIGSEGV(11)' 
(
    "0  Flutter                        0x000000010516f92c _ZNK3fml8internal14CopyableLambdaIZN7flutter5Shell21OnPlatformViewCreatedENSt3__110unique_ptrINS2_7SurfaceENS4_14default_deleteIS6_EEEEE3$_8EclIJEEEDaDpOT_ + 236",
    "1  Flutter                        0x000000010516f928 _ZNK3fml8internal14CopyableLambdaIZN7flutter5Shell21OnPlatformViewCreatedENSt3__110unique_ptrINS2_7SurfaceENS4_14default_deleteIS6_EEEEE3$_8EclIJEEEDaDpOT_ + 232",
    "2  Flutter                        0x0000000105123cf4 _ZN3fml15MessageLoopImpl10FlushTasksENS_9FlushTypeE + 1700",
    "3  Flutter                        0x0000000105126000 _ZN3fml17MessageLoopDarwin11OnTimerFireEP16__CFRunLoopTimerPS0_ + 32",
    "4  CoreFoundation                 0x0000000184cd3aa8 0x0000000184be5000 + 977576",
    "5  CoreFoundation                 0x0000000184cd376c 0x0000000184be5000 + 976748",
    "6  CoreFoundation                 0x0000000184cd3010 0x0000000184be5000 + 974864",
    "7  CoreFoundation                 0x0000000184cd0b60 0x0000000184be5000 + 965472",
    "8  CoreFoundation                 0x0000000184bf0da8 CFRunLoopRunSpecific + 552",
    "9  Flutter                        0x0000000105125edc _ZN3fml17MessageLoopDarwin3RunEv + 88",
    "10 Flutter                        0x0000000105125684 _ZNSt3__114__thread_proxyINS_5tupleIJNS_10unique_ptrINS_15__thread_structENS_14default_deleteIS3_EEEEZN3fml6ThreadC1ERKNS_12basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEEE3$_0EEEEEPvSJ_ + 200",
    "11 libsystem_pthread.dylib        0x0000000184951220 0x000000018494f000 + 8736",
    "12 libsystem_pthread.dylib        0x0000000184951110 0x000000018494f000 + 8464"
)
Application finished.

处理办法：

flutterVc dealloc 或者 disappear 的时候 执行 flutterEngine detach

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