Question

我对iOS上的开发相对较新，并试图熟悉RestKit，所以如果我遗漏了一些明显的东西，请耐心等待。

我们正在开发一个iOS 5应用程序，它将接收JSON并将其映射到对象（如果重要，则启用ARC）。为了寻找Restkit的教程，我遇到了this one。但是，那里的示例代码的简化版本（“带有RKClient的实际示例”部分中的那个）失败，并出现以下错误：

2012-01-14 22:15:55.124 Test_StaticLibInApp[789:707] *** Assertion failure in -[RKRequestQueue removeRequest:decrementCounter:], /Users/m/Documents/devel/ios/RestKit/Code/Network/RKRequestQueue.m:350
2012-01-14 22:15:55.129 Test_StaticLibInApp[789:707] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Attempted to decrement loading count below zero'

确切地说，这是我尝试过的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    RKClient *client = [RKClient clientWithBaseURL:@"some_url"];
    RKLogConfigureByName("RestKit/Network", RKLogLevelTrace);

    NSDictionary *queryParameters = [NSDictionary dictionaryWithObjectsAndKeys:nil];
    NSString *getResourcePath = RKPathAppendQueryParams(@"some_url_segment", queryParameters);
    RKRequest *request = [client get:getResourcePath delegate:self];
    [request sendAsynchronously];
}

- (void)request:(RKRequest *)request didLoadResponse:(RKResponse *)response
{
    id jsonParser = [[RKParserRegistry sharedRegistry] parserForMIMEType:RKMIMETypeJSON];
    NSError *error = nil;
    id parsedResponse = [jsonParser objectFromString:[response bodyAsString] error:&error];
    if (error == nil)
    {
        NSLog(@"GET returned with HTTP Code %d and parsedContent: %@", [response statusCode], parsedResponse);
    }
    else
    {
        NSLog(@"Error: %@", error);
    }
}

- (void)request:(RKRequest *)request didFailLoadWithError:(NSError *)error
{
    NSLog(@"Failure of GET with error %@.", error);
}

这是跟踪输出：

2012-01-14 22:15:54.746 Test_StaticLibInApp[789:707] I restkit:RKLog.m:30 RestKit initialized...
2012-01-14 22:15:54.765 Test_StaticLibInApp[789:707] D restkit.network:RKRequest.m:365 Sending asynchronous GET request to URL <url>.
2012-01-14 22:15:54.771 Test_StaticLibInApp[789:707] T restkit.network:RKRequest.m:313 Prepared GET URLRequest '<NSMutableURLRequest url>'. HTTP Headers: {
    "Content-Length" = 0;
}. HTTP Body: .
2012-01-14 22:15:54.852 Test_StaticLibInApp[789:707] I restkit.network.reachability:RKReachabilityObserver.m:369 Network availability has been determined for reachability observer <RKReachabilityObserver: 0x15c920 host=<server ip> isReachabilityDetermined=YES isMonitoringLocalWiFi=448340 reachabilityFlags=-R ------d>
2012-01-14 22:15:54.857 Test_StaticLibInApp[789:707] D restkit.network:RKClient.m:388 Reachability to host '<server ip>' determined for client <RKClient: 0x158740>, unsuspending queue <RKRequestQueue: 0x15b260 name=(null) suspended=YES requestCount=1 loadingCount=0/5>
2012-01-14 22:15:55.037 Test_StaticLibInApp[789:707] D restkit.network:RKResponse.m:189 NSHTTPURLResponse Status Code: 200
2012-01-14 22:15:55.044 Test_StaticLibInApp[789:707] D restkit.network:RKResponse.m:190 Headers: {
    "Content-Type" = "application/json";
    Date = "Sat, 14 Jan 2012 20:16:21 GMT";
    Server = "Apache-Coyote/1.1";
    "Transfer-Encoding" = Identity;
}
2012-01-14 22:15:55.048 Test_StaticLibInApp[789:707] T restkit.network:RKResponse.m:195 Read response body: <json text here>
2012-01-14 22:15:55.059 Test_StaticLibInApp[789:707] I restkit.network:RKRequest.m:565 Status Code: 200
2012-01-14 22:15:55.066 Test_StaticLibInApp[789:707] D restkit.network:RKRequest.m:566 Body: <json text here>
2012-01-14 22:15:55.106 Test_StaticLibInApp[789:707] GET returned with HTTP Code 200 and parsedContent: <json text here>
2012-01-14 22:15:55.124 Test_StaticLibInApp[789:707] *** Assertion failure in -[RKRequestQueue removeRequest:decrementCounter:], /Users/m/Documents/devel/ios/RestKit/Code/Network/RKRequestQueue.m:350
2012-01-14 22:15:55.129 Test_StaticLibInApp[789:707] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Attempted to decrement loading count below zero'
*** First throw call stack:
(0x33fac8bf 0x341fc1e5 0x33fac7b9 0x3595b3b3 0x1da7f 0x1e7a3 0x3598150f 0x33f78577 0x33f040cf 0x358f53fb 0x1818b 0x2064b 0x359b8c39 0x359106e9 0x359106b3 0x359105d5 0x31fbe8a5 0x31fb3545 0x31fb3243 0x31fb3179 0x33f80b03 0x33f802cf 0x33f7f075 0x33f024dd 0x33f023a5 0x30786fcd 0x37383743 0x2c81 0x2c18)

这个错误是否与使用ARC编译的应用程序有某种关系？对于Restkit安装，我从git master分支获取了文件，并按照安装说明进行操作，而不是更改任何设置。

提前感谢您的帮助。

Answer 1

行

[请求发送异步]

不需要。

[client get：getResourcePath delegate：self]

已发送请求，并减少请求计数。你到了

原因：'尝试将装载数减少到零以下'

因为这个。

Answer 2

不应在启用ARC的情况下编译RestKit。我所做的是为模拟器和设备编译RestKit，然后在我启用ARC的项目中添加生成的.a和include。另外，你是否将-all_load -ObjC添加到Other Linker Flags？的问候，

让Restkit教程代码工作

2 个答案: