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[iOS] Timing: Fixes timer when app get into background #24649

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[iOS] Timing: Fixes timer when app get into background #24649

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3214677
[iOS] Timing: Fixes timer when app get into background
zhongwuzw Apr 29, 2019
8e0b412
Code clean
zhongwuzw Apr 30, 2019
fc47b35
Fire background timer only if we have timer
zhongwuzw May 1, 2019
d38fea7
Update RCTTiming.m
cpojer May 30, 2019
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30 changes: 30 additions & 0 deletions React/Modules/RCTTiming.m
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Original file line number Diff line number Diff line change
Expand Up @@ -97,6 +97,7 @@ @implementation RCTTiming
NSTimer *_sleepTimer;
BOOL _sendIdleEvents;
BOOL _inBackground;
UIBackgroundTaskIdentifier _backgroundTaskIdentifier;
}

@synthesize bridge = _bridge;
Expand All @@ -112,6 +113,7 @@ - (void)setBridge:(RCTBridge *)bridge
_paused = YES;
_timers = [NSMutableDictionary new];
_inBackground = NO;
_backgroundTaskIdentifier = UIBackgroundTaskInvalid;

for (NSString *name in @[UIApplicationWillResignActiveNotification,
UIApplicationDidEnterBackgroundNotification,
Expand All @@ -135,10 +137,35 @@ - (void)setBridge:(RCTBridge *)bridge

- (void)dealloc
{
[self markEndOfBackgroundTaskIfNeeded];
[_sleepTimer invalidate];
[[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)markStartOfBackgroundTaskIfNeeded
{
if (_backgroundTaskIdentifier == UIBackgroundTaskInvalid) {
__weak typeof(self) weakSelf = self;
// Marks the beginning of a new long-running background task. We can run the timer in the background.
_backgroundTaskIdentifier = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
typeof(self) strongSelf = weakSelf;
if (!strongSelf) {
return;
}
// Mark the end of background task
[strongSelf markEndOfBackgroundTaskIfNeeded];
}];
}
}

- (void)markEndOfBackgroundTaskIfNeeded
{
if (_backgroundTaskIdentifier != UIBackgroundTaskInvalid) {
[[UIApplication sharedApplication] endBackgroundTask:_backgroundTaskIdentifier];
_backgroundTaskIdentifier = UIBackgroundTaskInvalid;
}
}

- (dispatch_queue_t)methodQueue
{
return RCTJSThread;
Expand All @@ -163,6 +190,7 @@ - (void)appDidMoveToBackground

- (void)appDidMoveToForeground
{
[self markEndOfBackgroundTaskIfNeeded];
_inBackground = NO;
[self startTimers];
}
Expand Down Expand Up @@ -260,6 +288,7 @@ - (void)didUpdateFrame:(RCTFrameUpdate *)update
}
if (_inBackground) {
if (timerCount) {
[self markStartOfBackgroundTaskIfNeeded];
[self scheduleSleepTimer:nextScheduledTarget];
}
} else if (!_sendIdleEvents && timersToCall.count == 0) {
Expand Down Expand Up @@ -338,6 +367,7 @@ - (void)timerDidFire
}

if (_inBackground) {
[self markStartOfBackgroundTaskIfNeeded];
[self scheduleSleepTimer:timer.target];
} else if (_paused) {
if ([timer.target timeIntervalSinceNow] > kMinimumSleepInterval) {
Expand Down