react-native/React/Modules/RCTAppState.m

100 lines
2.8 KiB
Objective-C

/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "RCTAppState.h"
#import "RCTAssert.h"
#import "RCTBridge.h"
#import "RCTEventDispatcher.h"
static NSString *RCTCurrentAppBackgroundState()
{
static NSDictionary *states;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
states = @{
@(UIApplicationStateActive): @"active",
@(UIApplicationStateBackground): @"background",
@(UIApplicationStateInactive): @"inactive"
};
});
return states[@([[UIApplication sharedApplication] applicationState])] ?: @"unknown";
}
@implementation RCTAppState
{
NSString *_lastKnownState;
}
@synthesize bridge = _bridge;
RCT_EXPORT_MODULE()
#pragma mark - Lifecycle
- (instancetype)init
{
if ((self = [super init])) {
_lastKnownState = RCTCurrentAppBackgroundState();
for (NSString *name in @[UIApplicationDidBecomeActiveNotification,
UIApplicationDidEnterBackgroundNotification,
UIApplicationDidFinishLaunchingNotification]) {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(handleAppStateDidChange)
name:name
object:nil];
}
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(handleMemoryWarning)
name:UIApplicationDidReceiveMemoryWarningNotification
object:nil];
}
return self;
}
- (void)handleMemoryWarning
{
[_bridge.eventDispatcher sendDeviceEventWithName:@"memoryWarning"
body:nil];
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
#pragma mark - App Notification Methods
- (void)handleAppStateDidChange
{
NSString *newState = RCTCurrentAppBackgroundState();
if (![newState isEqualToString:_lastKnownState]) {
_lastKnownState = newState;
[_bridge.eventDispatcher sendDeviceEventWithName:@"appStateDidChange"
body:@{@"app_state": _lastKnownState}];
}
}
#pragma mark - Public API
/**
* Get the current background/foreground state of the app
*/
RCT_EXPORT_METHOD(getCurrentAppState:(RCTResponseSenderBlock)callback
error:(__unused RCTResponseSenderBlock)error)
{
callback(@[@{@"app_state": _lastKnownState}]);
}
@end