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Keep resident runner connected on iOS when screen locks in debug mode (flutter/engine#3610)

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* Add debug mode background

* Review notes
This commit is contained in:
xster 2017-04-19 18:00:06 -07:00 committed by GitHub
parent 0e9ba7f5e7
commit 7900afc2fa
2 changed files with 27 additions and 1 deletions
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2
engine/src/flutter/shell/platform/darwin/ios/framework/Headers/FlutterAppDelegate.h
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@ -15,6 +15,8 @@
* This class provides the following behaviors:
* * Status bar touches are forwarded to the key window's root view
* FlutterViewController, in order to trigger scroll to top.
* * Keeps the Flutter connection open in debug mode when the phone screen
* locks.
*
* App delegates for Flutter applications are *not* required to inherit from
* this class. Developers of custom app delegate classes should copy and paste

26
engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterAppDelegate.mm
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@ -4,8 +4,11 @@
#include "flutter/shell/platform/darwin/ios/framework/Headers/FlutterAppDelegate.h"
#include "flutter/shell/platform/darwin/ios/framework/Headers/FlutterViewController.h"
#include "lib/ftl/logging.h"
@implementation FlutterAppDelegate
@implementation FlutterAppDelegate {
UIBackgroundTaskIdentifier _debugBackgroundTask;
}
// Returns the key window's rootViewController, if it's a FlutterViewController.
// Otherwise, returns nil.
@ -26,4 +29,25 @@
}
}
#if FLUTTER_RUNTIME_MODE == FLUTTER_RUNTIME_MODE_DEBUG
- (void)applicationDidEnterBackground:(UIApplication *)application {
// The following keeps the Flutter session alive when the device screen locks
// in debug mode. It allows continued use of features like hot reload and
// taking screenshots once the device unlocks again.
//
// Note the name is not an identifier and multiple instances can exist.
_debugBackgroundTask = [application beginBackgroundTaskWithName:@"Flutter debug task"
expirationHandler:^{
FTL_LOG(WARNING) << "\nThe OS has terminated the Flutter debug connection for being "
"inactive in the background for too long.\n\n"
"There are no errors with your Flutter application.\n\n"
"To reconnect, launch your application again via 'flutter run";
}];
}
- (void)applicationWillEnterForeground:(UIApplication *)application {
[application endBackgroundTask: _debugBackgroundTask];
}
#endif // FLUTTER_RUNTIME_MODE == FLUTTER_RUNTIME_MODE_DEBUG
@end