Question

我已经实现了CloudKit抓取功能。不过我这里有些问题。当我使用下面的代码时

-(void) centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI {
    NSLog(@"Discovered peripheral %@ (%@)",peripheral.name,peripheral.identifier.UUIDString);
    if (![self.discoveredPeripherals containsObject:peripheral] ) {

        dispatch_async(dispatch_get_main_queue(), ^{
            [self.discoveredPeripherals addObject:peripheral];
            [self.tableview insertRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:self.discoveredPeripherals.count-1 inSection:0]] withRowAnimation:UITableViewRowAnimationLeft];
        });
    }
    [central connectPeripheral:peripheral options:nil];
}   
-(void) centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral {
    peripheral.delegate = self;

    if(peripheral.services)
        [self peripheral:peripheral didDiscoverServices:nil]; //already discovered services, DO NOT re-discover. Just pass along the peripheral.
    else
        [peripheral discoverServices:nil];

}
-(void) peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error {
    for(CBService* svc in peripheral.services)
    { NSLog(@" service %@",svc.description);
       if(svc.characteristics)
 [self peripheral:peripheral didDiscoverCharacteristicsForService:svc error:nil]; 
        else
[peripheral discoverCharacteristics:nil forService:svc]; 
 }
}
-(void) peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error {
    for (CBCharacteristic *characteristic in service.characteristics ) {
        NSLog(@"Discovered characteristic %@(%@)",characteristic.description,characteristic.UUID.UUIDString);
        NSLog(@"Characteris is %@",[characteristic description]);
    }
}

我可以成功获取数据。但是，一旦我改变代码，如

    let cloudContainer = CKContainer.defaultContainer()
    let publicDatabase = cloudContainer.publicCloudDatabase
    let predicate = NSPredicate(value: true)
    let query = CKQuery(recordType: "Restaurant", predicate: predicate)

    publicDatabase.performQuery(query, inZoneWithID: nil, completionHandler: {
        results, error in
        if error == nil {
            print("Completed the download of Restauran data")
            self.restaurants = results! as [CKRecord]
            dispatch_async(dispatch_get_main_queue(), {
                self.tableView.reloadData()
            })
        } else {
            print(error)
        }
    })

使用CKQueryOperation，我将无法获取数据。我想知道问题出在哪里。

更新10.8

我一直在努力解决这个问题。我发现该应用甚至没有输入restaurants = [] let cloudContainer = CKContainer.defaultContainer() let publicDatabase = cloudContainer.publicCloudDatabase let predicate = NSPredicate(value: true) let query = CKQuery(recordType: "Restaurant", predicate: predicate) let queryOperation = CKQueryOperation(query: query) queryOperation.desiredKeys = ["name", "image"] queryOperation.queuePriority = .VeryHigh queryOperation.resultsLimit = 50 queryOperation.recordFetchedBlock = { (record:CKRecord!) -> Void in if let restaurantRecord = record { self.restaurants.append(restaurantRecord) } } queryOperation.queryCompletionBlock = { [unowned self] (cursor, error) in if (error != nil) { print("Failed to get data from iCloud - \(error!.localizedDescription)") } else { print("Successfully retrieve the data form iCloud") dispatch_async(dispatch_get_main_queue(), { self.tableView.reloadData() }) } } publicDatabase.addOperation(queryOperation)和recordFetchedBlock。我不知道为什么会这样。

Answer 1

最后，今天我修复了您请求的代码的错误。它现在正在工作......请问我是否需要进一步的帮助。感谢。

restaurants = []
let cloudContainer = CKContainer.defaultContainer()
let publicDatabase = cloudContainer.publicCloudDatabase

let predicate = NSPredicate(value: true)
let query = CKQuery(recordType: "Restaurant", predicate: predicate)

let queryOperation = CKQueryOperation(query: query)
queryOperation.desiredKeys = ["name", "image"]
queryOperation.queuePriority = .VeryHigh
queryOperation.resultsLimit = 50

queryOperation.recordFetchedBlock = { (record:CKRecord!) -> Void in

    self.restaurants.append(record)
}

queryOperation.queryCompletionBlock = { (cursor: CKQueryCursor?, error: NSError?) in
  dispatch_async(dispatch_get_main_queue()) {
    if (error != nil) {
        print("Failed to get data from iCloud - \(error!.localizedDescription)")
    } else {
        print("Successfully retrieve the data form iCloud")
        self.tableView.reloadData()

    }
  }
}

无法使用CloudKit的CKQueryOperation从iCloud获取数据

1 个答案: