在解析iOS中的JSON时出现了一些错误？

Question

这里是我的解析代码：

- (void)connectionDidFinishLoading:(NSURLConnection *)connection{ 
NSError *myError = nil; 
NSDictionary *flighttrackjson = [NSJSONSerialization JSONObjectWithData:jsonresponse options:NSJSONReadingMutableLeaves error:&myError]; 
NSArray *FlightStatus = [flighttrackjson objectForKey:@"flightStatuses"]; 
NSString *FlightID = [FlightStatus valueForKey:@"flightId"]; 
NSString *DepartACode = [FlightStatus valueForKey:@"departureAirportFsCode"]; 
NSString *ArivalACode = [FlightStatus valueForKey:@"arrivalAirportFsCode"]; 
NSArray *DepartATime = [FlightStatus valueForKey:@"departureDate"]; 
NSArray *AriveATime = [FlightStatus valueForKey:@"arrivalDate"]; 
NSString *DepartTimeString = [DepartATime valueForKey:@"dateLocal"]; 
NSString *ArriveTimeString = [AriveATime valueForKey:@"dateUtc"]; 
NSArray *Delays = [FlightStatus valueForKey:@"delays"]; 
NSString *DepartDelayMinutes = [Delays valueForKey:@"departureGateDelayMinutes"]; 
NSString *ArriveDelayMinutes = [Delays valueForKey:@"arrivalGateDelayMinutes"]; 
NSArray *AirportInfo = [FlightStatus valueForKey:@"airportResources"]; 
NSString *DepartTerminal = [AirportInfo valueForKey:@"departureTerminal"]; 
NSString *DepartAGate = [AirportInfo valueForKey:@"departureGate"]; 
NSString *ArriveTerminal = [AirportInfo valueForKey:@"arrivalTerminal"]; 
NSString *ArriveAGate = [AirportInfo valueForKey:@"arrivalGate"]; 
NSString *BaggageClaim = [AirportInfo valueForKey:@"baggage"]; 
flightID.text=FlightID; 
DepartCode.text=DepartACode; 
ArrivalCode.text=ArivalACode; 
DepartTime.text=DepartTimeString; 
ArriveTime.text=ArriveTimeString; 
DepartDelay.text=DepartDelayMinutes; 
ArriveDelay.text=ArriveDelayMinutes; 
DepartTerm.text=DepartTerminal; 
DepartGate.text=DepartAGate; 
ArriveTerm.text=ArriveTerminal; 
ArriveGate.text=ArriveAGate; 
Baggage.text=BaggageClaim; 
} 

当我运行的，它给了我这样的：

2013年2月9日21：51：40.262的地方[7083：C07] - [__ NSArrayI isEqualToString： ]：无法识别的选择器发送到实例0x8262b50 2013-02-09 21：51：40.263位置[7083：c07] *终止应用程序由于未捕获的异常'NSInvalidArgumentException'，原因：' - [__ NSArrayI isEqualToString：]：无法识别的选择器发送到实例0x8262b50'

和hi ghlights this：

return UIApplicationMain（argc，argv，nil，NSStringFromClass（[AppDelegate class]））;

我的代码看起来很糟糕，或者至少有人能够解释这个错误可能意味着什么吗？

这是我正在与之合作。 http://pastebin.com/vv8ScBfZ

对不起，我对这一切都很陌生。

感谢您的任何提示！

Answer 1

它看起来像FlightStatus是一个具有一个对象的数组（有一串键的字典）。由于它是一个数组，因此必须首先获取该对象，然后才能在其包含的字典上使用valueForKey：。要解决这个问题最简单的方法是可以改变：

NSArray *FlightStatus = [flighttrackjson objectForKey:@"flightStatuses"]; 

这样：

NSDictionary *FlightStatus = [[flighttrackjson objectForKey:@"flightStatuses"] lastObject];