我正在尝试将ASIFormDataRequest与以下代码一起使用：
NSURL *url = [NSURL URLWithString: urlString];
ASIFormDataRequest *request = [ASIHTTPRequest requestWithURL:url];
[request addPostValue:@"json" forKey:@"json"];
[request setDelegate:self];
[request startAsynchronous];
代码在[request addPostValue:@"json" forKey:@"json"];行崩溃。我也试过setPostValue:forKey:同样的结果。如果我注释掉addPostValue:forKey:行，请求会通过（我可以在服务器上看到它），但当然没有json数据。
我通过传入字符串json来简化问题。一旦我发现了这个问题，那实际上就是我的json格式化字符串。
这是堆栈跟踪：
2011-06-28 08:49:29.344 Gleek[26170:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ASIHTTPRequest addPostValue:forKey:]: unrecognized selector sent to instance 0x5024400'
*** Call stack at first throw:
(
0 CoreFoundation 0x010f85a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x0124c313 objc_exception_throw + 44
2 CoreFoundation 0x010fa0bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x01069966 ___forwarding___ + 966
4 CoreFoundation 0x01069522 _CF_forwarding_prep_0 + 50
5 Gleek 0x00006bab -[ProcedureDefDetailViewController toggleCompletedStatus:] + 1451
6 UIKit 0x005e44fd -[UIApplication sendAction:to:from:forEvent:] + 119
7 UIKit 0x00674799 -[UIControl sendAction:to:forEvent:] + 67
8 UIKit 0x00676c2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
9 UIKit 0x006757d8 -[UIControl touchesEnded:withEvent:] + 458
10 UIKit 0x00608ded -[UIWindow _sendTouchesForEvent:] + 567
11 UIKit 0x005e9c37 -[UIApplication sendEvent:] + 447
12 UIKit 0x005eef2e _UIApplicationHandleEvent + 7576
13 GraphicsServices 0x018b6992 PurpleEventCallback + 1550
14 CoreFoundation 0x010d9944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
15 CoreFoundation 0x01039cf7 __CFRunLoopDoSource1 + 215
16 CoreFoundation 0x01036f83 __CFRunLoopRun + 979
17 CoreFoundation 0x01036840 CFRunLoopRunSpecific + 208
18 CoreFoundation 0x01036761 CFRunLoopRunInMode + 97
19 GraphicsServices 0x018b51c4 GSEventRunModal + 217
20 GraphicsServices 0x018b5289 GSEventRun + 115
21 UIKit 0x005f2c93 UIApplicationMain + 1160
22 Gleek 0x00002a09 main + 121
23 Gleek 0x00002985 start + 53
24 ??? 0x00000001 0x0 + 1
)
由于
答案 0 :(得分：2)
答案很简单，你必须使用：
ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
你正在使用，
ASIFormDataRequest *request = [ASIHTTPRequest requestWithURL:url];
只需改变它，它就会起作用。
始终确保使用正确的类构造函数初始化对象。