Question

我正在尝试JSONSerialize我从NSFetchRequest获得的NSArray，但是当我调用isValidJSONObject时，我最终在它告诉我它无效的部分

代码如下，我最终在＆＃34;不工作＆＃34;参与调试。

+ (int) synchOrder:(NSString *)orderNumber {
    if ([NWTillHelper isDebug] == 1) {
        NSLog(@"WebServices:synchOrder:ordernumber = %@", orderNumber);
    }

    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication]delegate];

    NSManagedObjectContext *context = appDelegate.persistentContainer.viewContext;

    // *** Fetch the orderHead information

    // *** The query for all tables uses orderNumber as selection so we set that up first for re use
    NSPredicate *predicateOrderNumber =[NSPredicate predicateWithFormat:@"orderNumber like[cd] %@", [NWTillHelper getCurrentOrderNumber]];

    NSFetchRequest *fetchRequestOh = [[NSFetchRequest alloc] initWithEntityName:@"OrderHead"];
    NSFetchRequest *fetchRequestOrp = [[NSFetchRequest alloc] initWithEntityName:@"OrderRow"];
    NSFetchRequest *fetchRequestTender = [[NSFetchRequest alloc] initWithEntityName:@"Tender"];

    fetchRequestOh.predicate = predicateOrderNumber;
    fetchRequestOrp.predicate = predicateOrderNumber;
    fetchRequestTender.predicate = predicateOrderNumber;

    fetchRequestOh.resultType = NSDictionaryResultType;
    fetchRequestOrp.resultType = NSDictionaryResultType;
    fetchRequestTender.resultType = NSDictionaryResultType;

    NSError *errorOh = nil;
    NSArray *orderHeads = [[context executeFetchRequest:fetchRequestOh error:&errorOh] mutableCopy];

    NSError *errorOrp = nil;
    NSArray *orderRows = [[context executeFetchRequest:fetchRequestOrp error:&errorOrp] mutableCopy];

    NSError *errorTender = nil;
    NSArray *tenderRows = [[context executeFetchRequest:fetchRequestTender error:&errorTender] mutableCopy];

    if ([NWTillHelper isDebug] == 1) {
        NSLog(@"WebServices:synchOrder:orderHeadsArray: %@", orderHeads);
        NSLog(@"WebServices:synchOrder:orderRowsArray: %@", orderRows);
        NSLog(@"WebServices:synchOrder:tenderRowsArray: %@", tenderRows);
    }

    // *** first lets upload orderHead
    NSError *errorWebSvsOhApi;

    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];

    NSURLSession *sessionOrderHead = [NSURLSession sessionWithConfiguration:configuration delegate:nil delegateQueue:nil];

    NSURL *url = [NSURL URLWithString:@"https://XXX.YYY.ZZ:0000/path/to/api"];

    NSMutableURLRequest *requestOrderHeads = [NSMutableURLRequest requestWithURL:url
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:60.0];

    if ([NSJSONSerialization isValidJSONObject:orderHeads]) {
NSLog(@"works");
} else {
NSLog(@"Does not work");
}

数组的调试输出如下所示。

2016-12-24 11:55:38.362 NWMobileTill[1007:69570] WebServices:synchOrder:orderHeadsArray: (
        {
        amountTax = 0;
        companyId = Kalle;
        createdDateUtc = "2016-12-24 03:55:25 +0000";
        isSynched = 0;
        orderNumber = "1-20161224115525";
        orderType = 0;
        status = 0;
        sumAfterTrDiscount = 0;
        sumBeforeTrDiscount = 0;
        tillId = 1;
        trDiscountAmount = 0;
        trDiscountPercentage = 0;
        userName = 1;
    }
)

Answer 1

它必须是有效的。这是我根据您自己的数据和代码进行的实验。它按预期工作正常。

NSArray *test = @[@{@"amountTax" : @0,
                    @"companyId" : @"Kalle",
                    @"createdDateUtc" : @"2016-12-24 03:55:25 +0000",
                    @"isSynched" : @(false),
                    @"orderNumber" : @"1-20161224115525",
                    @"orderType" : @0,
                    @"status" : @(false),
                    @"sumAfterTrDiscount" : @0,
                    @"sumBeforeTrDiscount" : @0,
                    @"tillId" : @1,
                    @"trDiscountAmount" : @0,
                    @"trDiscountPercentage" : @0,
                    @"userName" : @1
                    }];

NSLog(@"Test:%@", test);

if ([NSJSONSerialization isValidJSONObject:test]) {
    NSLog(@"works");
} else {
    NSLog(@"Does not work");
}

调试输出：

Test:(
    {
    amountTax = 0;
    companyId = Kalle;
    createdDateUtc = "2016-12-24 03:55:25 +0000";
    isSynched = 0;
    orderNumber = "1-20161224115525";
    orderType = 0;
    status = 0;
    sumAfterTrDiscount = 0;
    sumBeforeTrDiscount = 0;
    tillId = 1;
    trDiscountAmount = 0;
    trDiscountPercentage = 0;
    userName = 1;
}
)
2016-12-24 13:38:34.098 sample[2628:58572] works

isValidJSONObject 用于返回一个布尔值，该值指示是否可以将给定对象转换为JSON数据。如果使用无效的NSArray对象进行检查，则返回false。但是，根据您的代码和自定义我自己的数组返回有效。检查数组对象是否正确，还要检查该数组是否为空。如果array为空，则返回false。

Answer 2

问题是NSDate无法序列化为Vadian在评论中声明，通过使用以下日期格式化程序，它解决了问题并且NSArray可以正确地进行JSONSerialized

按如下所示创建日期并设置dateFormatter

NSDate *createdDate = [NSDate date];

NSDateFormatter *dateFormatterWithTz = [[NSDateFormatter alloc] init];
[dateFormatterWithTz setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssZZZZZ"];

然后，将日期保存到持久存储时，请使用格式化程序，如下所示

[newTenderRow setValue:[dateFormatterWithTz stringFromDate:createdDate] forKey:@"createdDate"];

为什么我不能JSONSerialize这个NSArray？

2 个答案: