fc309750a9
Track UIApplication applicationState changes from a C++ class. Uses NSNotificationCenter to access changes on the main thread and exposes a local variable that can be checked from any thread. This fixes a runtime warning on iOS 11 beta. My Objective-C++ is a little rusty so please check if this follows the conventions for C++ code in the project. It also changes the interface exposed by RTCUIApplication.h, not sure if that has impact on any public APIs that needs to be documented somewhere? Bug: webrtc:7773 Change-Id: I9c8ba090ef9f28d812114026a906cef742192c39 Reviewed-on: https://chromium-review.googlesource.com/527442 Reviewed-by: Magnus Jedvert <magjed@webrtc.org> Reviewed-by: Kári Tristan Helgason <kthelgason@webrtc.org> Commit-Queue: Anders Carlsson <andersc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#18558}
69 lines
1.9 KiB
Objective-C
69 lines
1.9 KiB
Objective-C
/*
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* Copyright 2016 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "RTCUIApplicationStatusObserver.h"
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#if defined(WEBRTC_IOS)
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#import <UIKit/UIKit.h>
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@implementation RTCUIApplicationStatusObserver {
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UIApplicationState _state;
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}
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+ (instancetype)sharedInstance {
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static id sharedInstance;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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sharedInstance = [[self alloc] init];
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});
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return sharedInstance;
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}
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- (id)init {
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if (self = [super init]) {
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NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
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[center addObserverForName:UIApplicationDidBecomeActiveNotification
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object:nil
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queue:[NSOperationQueue mainQueue]
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usingBlock:^(NSNotification *note) {
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_state = [UIApplication sharedApplication].applicationState;
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}];
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[center addObserverForName:UIApplicationDidEnterBackgroundNotification
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object:nil
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queue:[NSOperationQueue mainQueue]
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usingBlock:^(NSNotification *note) {
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_state = [UIApplication sharedApplication].applicationState;
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}];
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dispatch_block_t initializeBlock = ^{
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_state = [UIApplication sharedApplication].applicationState;
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};
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if ([NSThread isMainThread]) {
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initializeBlock();
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} else {
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dispatch_sync(dispatch_get_main_queue(), initializeBlock);
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}
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}
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return self;
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}
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- (BOOL)isApplicationActive {
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return _state == UIApplicationStateActive;
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}
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@end
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#endif // WEBRTC_IOS
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