SBJSON将NSString解析为NSDictionary [英] SBJSON parsing NSString to NSDictionary

问题描述

我正在尝试使用SBJson 3.0.4将包含JSON数据的NSString解析为NSDictionary，但是当我这样做时，出现此错误:

I'm trying to parse an NSString that contains JSON data into an NSDictionary using SBJson 3.0.4, but when I do it, I get this error:

"WebKit丢弃了webView:shouldInsertText:replacingDOMRange:givenAction中的未捕获异常:委托:-[__ NSCFString JSONValue]:无法识别的选择器已发送到实例0x6ab7a40"

"WebKit discarded an uncaught exception in the webView:shouldInsertText:replacingDOMRange:givenAction: delegate: -[__NSCFString JSONValue]: unrecognized selector sent to instance 0x6ab7a40"

据我所知(不是很远)，我得到的JSON是有效的，所以我不知道为什么会这样.我的代码也可以正常编译… 在这里:

As far as I know (which isn't very far), the JSON I'm getting is valid, so I don't know why this is happening. My code compiles fine too… Here it is:

NSString *tempURL = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/geocode/json?address=%@&sensor=true",userInput.text];
NSURL *url = [NSURL URLWithString:tempURL];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url 
                                            cachePolicy:NSURLRequestReturnCacheDataElseLoad
                                        timeoutInterval:30];
// fetch the JSON response
NSData *urlData;
NSURLResponse *response;
NSError *error;

// make the synchronous request
urlData = [NSURLConnection sendSynchronousRequest:urlRequest 
                                returningResponse:&response 
                                            error:&error];

// construct a String around the Data from the response
NSString *data = [[NSString alloc] initWithData:urlData encoding:NSUTF8StringEncoding];
NSDictionary *feed = [data JSONValue];

推荐答案

错误消息的重要部分是:

The important part of the error message is this:

-[__NSCFString JSONValue]: unrecognized selector sent to instance 0x6ab7a40

__NSCFString类是NSString接口的私有实现类，因此您可以假装它说NSString.

The __NSCFString class is the private implementation class for the NSString interface, so you can just pretend it says NSString.

所以我们看到您正在将JSONValue消息发送到NSString，并且NSString说它无法识别该选择器. SBJson库将JSONValue方法添加到NSString类

So we see that you are sending the JSONValue message to an NSString, and the NSString says it doesn't recognize that selector. The SBJson library adds a JSONValue method to the NSString class using a category.

因此，我推断您尚未将NSObject+SBJson.o链接到您的应用程序.如果您将SBJson源文件复制到您的应用程序中，请确保已在NSObject+SBJson.m中进行了复制，并确保将其包含在目标的编译源"构建阶段中.

So I deduce that you haven't linked NSObject+SBJson.o into your app. If you copied the SBJson source files into your app, make sure you copied in NSObject+SBJson.m, and make sure it is included in the "Compile Sources" build phase of your target.

如果您构建了SBJson库并将其链接到您的应用，则可能需要在链接器选项中甚至添加-ObjC标志，甚至添加-all_load标志.

If you built an SBJson library and are linked your app to that, you may need to add the -ObjC flag to your linker options, or even the -all_load flag.

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