在WatchKit中解析查询

时间:2015-03-14 16:07:43

标签: ios objective-c iphone parse-platform watchkit

我在Parse应用中进行了iPhone查询,但是我在Parse应用中尝试执行相同的Watch查询时出现错误

这是我的iPhone应用中的查询:

- (void)viewDidLoad {
    // GMT Date from Phone
    NSDate *gmtNow = [NSDate date];
    NSLog(@"GMT Now: %@", gmtNow);

    // Query Parse
    PFQuery *query = [self queryForTable];
    [query whereKey:@"dateGame" greaterThanOrEqualTo:gmtNow];

    [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (!error) {
            NSMutableArray *localMatchup = [@[] mutableCopy];

            for (PFObject *object in objects) {
                // Add objects to local Arrays
                [localMatchup addObject:[object objectForKey:@"matchup"]];

                // App Group
                NSString *container = @"group.com.me.off";
                NSUserDefaults *defaults = [[NSUserDefaults alloc] initWithSuiteName:container];

                // Matchup
                [defaults setObject:localMatchup forKey:@"KeyMatchup"];
                NSArray *savedMatchup = [defaults objectForKey:@"KeyMatchup"];
                NSLog(@"Default Matchup: %@", savedMatchup);
                savedMatchup = matchupArray;
            }

            dispatch_async(dispatch_get_main_queue(), ^{
                [self.tableView reloadData];
            });

        }
    }];
}

这是我在WatchKit应用程序中尝试的查询...

- (void)awakeWithContext:(id)context {
    // GMT Date from Phone
    NSDate *gmtNow = [NSDate date];
    NSLog(@"GMT Now: %@", gmtNow);

    // Query Parse
    PFQuery *query = [self queryForTable];
    [query whereKey:@"dateGame" greaterThanOrEqualTo:gmtNow];

    [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (!error) {
            NSMutableArray *localMatchup = [@[] mutableCopy];

            for (PFObject *object in objects) {
                // Add objects to local Arrays
                [localMatchup addObject:[object objectForKey:@"matchup"]];

                // App Group
                NSString *container = @"group.com.me.off";
                NSUserDefaults *defaults = [[NSUserDefaults alloc] initWithSuiteName:container];

                // Matchup
                [defaults setObject:localMatchup forKey:@"KeyMatchup"];
                NSArray *savedMatchup = [defaults objectForKey:@"KeyMatchup"];
                NSLog(@"Default Matchup: %@", savedMatchup);
                savedMatchup = self.matchupArray;
            }

            dispatch_async(dispatch_get_main_queue(), ^{
                [self.tableView reloadData];
            });
        }
    }];
}

但我在这两行上都有错误......

`PFQuery *query = [self queryForTable];`

`[self.tableView reloadData];`

因为我无法执行与table猜测相关的完全相同的代码,但我不知道该将其更改为什么。

编辑:每个@cnoon回答添加代码

WatchKit InterfaceController.m

我如何要求我的查询在此处运行?      - (void)awakeWithContext:(id)context {         [super awakeWithContext:context];

    [WKInterfaceController openParentApplication:nil reply:^(NSDictionary *replyInfo, NSError *error) {
        // What to put here?
        NSLog(@"Open Parent Application");
    }];

- 和 -

iPhone AppDelegate.h

我如何要求PFQuery投放?

- (void)application:(UIApplication *)application handleWatchKitExtensionRequest:(NSDictionary *)userInfo reply:(void(^)(NSDictionary *replyInfo))reply {
    // What to put here?
}

1 个答案:

答案 0 :(得分:8)

WatchKit应用程序中没有UITableView这样的东西。相反,您必须使用WKInterfaceTable。在继续之前,我还建议您仔细阅读WatchKit Programming Guide中的文档。它将使您更好地了解作为有抱负的Apple Watch开发人员可以使用的所有工具集。

WKInterfaceTable

一旦你知道了WKInterfaceTable的细节,你就会很快看到为什么你的方法存在缺陷有两个原因。首先,您没有reloadData方法。 WatchKit中的替代方案是setNumberOfRows(_:withRowTypes:)。然后,您需要遍历每一行并进行配置。

WatchKit扩展中的PFQuery

您遇到问题的第二个原因是您使用了PFQuery

  

这是一个侧面建议,所以接受或离开它。我从这里的经验谈起,已经构建了一个非常大的基于页面的Watch App,它与iOS App进行了大量的通信。

我建议你停止在WatchKit Extension中制作PFQuery。原因是使用您的Watch App的用户只会打开应用程序一两秒钟。一切都会发生得非常快。因此,在用户终止Watch App之前,很难保证网络呼叫的成功。这使得事情变得更加困难,但事实就是如此。

相反,您希望在iOS应用上运行PFQuery次呼叫,并通过以下呼叫将该信息返回到Watch Extension:

您也可以使用shared app group或类似的方法将PFQuery缓存到MMWormhole。下面是一个示例,说明如何让Watch Extension请求iOS应用程序运行PFQuery,将数据缓存在MMWormhole中,并在完成后通知Watch Extension。通过始终从缓存中读取数据,无论Watch Extension是否仍在运行以及关闭和重新打开,您都有一个一致的机制。


目标C

<强> InterfaceController.m

- (void)willActivate {
    [super willActivate];

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 2.0 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
        [WKInterfaceController
         openParentApplication:@{@"pfquery_request": @"dumm_val"}
         reply:^(NSDictionary *replyInfo, NSError *error) {
             NSLog(@"User Info: %@", replyInfo);
             NSLog(@"Error: %@", error);

             if ([replyInfo[@"success"] boolValue]) {
                 NSLog(@"Read data from Wormhole and update interface!");
             }
        }];
    });
}

<强> AppDelegate.m

- (void)application:(UIApplication *)application handleWatchKitExtensionRequest:(NSDictionary *)userInfo reply:(void (^)(NSDictionary *))reply {
    if (userInfo[@"pfquery_request"]) {
        NSLog(@"Starting PFQuery"); // won't print out to console since you're running the watch extension

        // 1. Run the PFQuery
        // 2. Write the data into MMWormhole (done in PFQuery completion block)
        // 3. Send the reply back to the extension as success (done in PFQuery completion block)

        reply(@{@"success": @(YES)});
    }

    reply(@{@"success": @(NO)});
}

夫特

<强> InterfaceController.swift

override func willActivate() {
    super.willActivate()

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, Int64(2.0 * Float(NSEC_PER_SEC))), dispatch_get_main_queue()) {
        WKInterfaceController.openParentApplication(["pfquery_request": "dummy_val"]) { userInfo, error in
            println("User Info: \(userInfo)")
            println("Error: \(error)")

            if let success = (userInfo as? [String: AnyObject])?["success"] as? NSNumber {
                if success.boolValue == true {
                    println("Read data from Wormhole and update interface!")
                }
            }
        }

        return
    }
}

<强> AppDelegate.swift

func application(
    application: UIApplication!,
    handleWatchKitExtensionRequest userInfo: [NSObject : AnyObject]!,
    reply: (([NSObject : AnyObject]!) -> Void)!)
{
    if let pfqueryRequest: AnyObject = (userInfo as? [String: AnyObject])?["pfquery_request"] {
        println("Starting PFQuery") // won't print out to console since you're running the watch extension

        // 1. Run the PFQuery
        // 2. Write the data into MMWormhole (done in PFQuery completion block)
        // 3. Send the reply back to the extension as success (done in PFQuery completion block)

        reply(["success": true])
    }

    reply(["success": false])
}

希望这有助于打破从缓存中读取数据的一致方式以及将网络请求(或PFQueries)卸载到iOS应用程序的复杂性。