我有一个 REST 服务,它产生的 JSON 结果已通过几种不同的验证工具等进行了验证。我对 iOS 开发相当陌生,但一般来说不是开发。我在从服务响应中提取对象/响应/任何内容时遇到了一些问题。尽管我尽了最大的努力,但我的尝试并没有成功。
服务的典型响应:
[
{
"prcID": 547,
"prcName": "walls",
"prcDescription": "hi-lo",
"1prc": 270,
"2prc": 282,
"3prc": 312,
"4prc": 348,
"5prc": 354,
"6prc": 360,
"7prc": 366,
"8prc": 372,
"9prc": 384,
"10prc": 432
},
{
"prcID": 548,
"prcName": "doors",
"prcDescription": "hi-lo",
"1prc": 270,
"2prc": 282,
"3prc": 312,
"4prc": 348,
"5prc": 354,
"6prc": 360,
"7prc": 366,
"8prc": 372,
"9prc": 384,
"10prc": 432
}
]
该代码是示例代码的混合,并且我自己尝试使事情起作用:
- (void)fetchedData:(NSData *)responseData {
//parse out the json data
NSError* error;
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData //1
options:kNilOptions
error:&error];
NSMutableArray *myarray = [json.description mutableCopy];
outPutText.text = [myarray mutableCopy];
}
- (void)viewDidLoad
{
[super viewDidLoad];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData* data = [NSData dataWithContentsOfURL:
[NSURL URLWithString:@"someserviceurl"]];
[self performSelectorOnMainThread:@selector(fetchedData:)
withObject:data waitUntilDone:YES];
});
}
这段代码至少让我可以在 TextView 中看到来自服务的响应,但是每次我尝试使用 ObjectAtIndex 或使用 AllKeys 进行迭代来钻取“json”NSDictionary 时,我都会遇到与尝试下面的代码时类似的错误:
NSArray* somearray = [json objectForKey:@"prcName"];
NSLog(@"PriceName: %@", somearray);
错误是:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x71944b0'
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