cherry pick：无需detach，避免在app且后台返回后surfaceUpdated因没有owner vc而创建surface失败

f56f4e6e · 余玠 · 1d542e4d · f56f4e6e
Commit f56f4e6e authored Mar 25, 2020 by 余玠
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ios/Classes/container/FLBFlutterViewContainer.m ios/Classes/container/FLBFlutterViewContainer.m +0 -1

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--- a/ios/Classes/container/FLBFlutterViewContainer.m
+++ b/ios/Classes/container/FLBFlutterViewContainer.m
@@ -266,7 +266,6 @@ static NSUInteger kInstanceCounter = 0;
    if (self == FLUTTER_VC)
    {
        [self surfaceUpdated:NO];
-        [self detatchFlutterEngine];
    }
    [super bridge_viewDidDisappear:animated];
 }