CoreBluetooth状态保存：还原CBCentralManager的正确方法

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问题描述

当由于状态保存事件而使应用程序吃完午餐时，从AppDelegate恢复CBCentralManager的正确方法是什么？

what is the correct way to restore the CBCentralManager from AppDelegate when the App gets lunched with options due to a state preservation event?

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // The system provides the restoration identifiers only for central managers that had active or pending peripheral connections or were scanning for peripherals.
    NSArray * centralManagerIdentifiers = launchOptions[UIApplicationLaunchOptionsBluetoothCentralsKey];

    if (centralManagerIdentifiers != nil) {
        for (int i=0; i<[centralManagerIdentifiers count]; i++) {
            NSString * identifier = [centralManagerIdentifiers objectAtIndex:i];
            NSLog(@"bluetooth central key identifier %@", identifier);
            // here I expect to re-instatiate the CBCentralManager but not sure how and if this is the best place..
        }
    }

    // Override point for customization after application launch.
    return YES;
}

推荐答案

当您获得标识符列表时，则必须遍历此列表并为每个标识符初始化 CBCentralManager 的实例。列表包含 NSString s对象。

When you get list of identifiers, you have to iterate thru this list and initialise instance(s) of CBCentralManager for each identifier. List contains NSStrings objects.

NSArray *centralManagerIdentifiers = launchOptions[UIApplicationLaunchOptionsBluetoothCentralsKey];

for (NSString *centralManagerIdentifier in centralManagerIdentifiers) {
    CBCentralManager *centralManager = [[CBCentralManager alloc] initWithDelegate:self
                                                                            queue:nil
                                                                          options:@{CBCentralManagerOptionRestoreIdentifierKey: centralManagerIdentifier}];

    [self.cenralManagers addObject:centralManager];
}

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