我有一个有三个选择的分段控制，每个选项都进行不同的计算。计算正在操纵字符串。
我注意到当我第一次启动应用程序时，字符串是nil，顺便说一句。如果我触摸分段控件上的所有三个选项，应用程序将崩溃，这是堆栈跟踪。
我到处搜索但仍无法找到问题。
[Session started at 2011-02-25 01:21:03 -0500.]
2011-02-25 01:21:07.075 tipApp[2184:207] -[_UIStretchableImage isEqualToString:]: unrecognized selector sent to instance 0x4b5c0a0
2011-02-25 01:21:07.078 tipApp[2184:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_UIStretchableImage isEqualToString:]: unrecognized selector sent to instance 0x4b5c0a0'
*** Call stack at first throw:
(
0 CoreFoundation 0x00db7be9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f0c5c2 objc_exception_throw + 47
2 CoreFoundation 0x00db96fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x00d29366 ___forwarding___ + 966
4 CoreFoundation 0x00d28f22 _CF_forwarding_prep_0 + 50
5 tipApp 0x00006f13 -[tipAppViewController exact] + 56
6 tipApp 0x00006ed3 -[tipAppViewController mirror] + 4772
7 tipApp 0x000057f2 -[tipAppViewController segmentedControlIndexChanged] + 104
8 UIKit 0x002c0a6e -[UIApplication sendAction:to:from:forEvent:] + 119
9 UIKit 0x0034f1b5 -[UIControl sendAction:to:forEvent:] + 67
10 UIKit 0x00351647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
11 UIKit 0x0034f16c -[UIControl sendActionsForControlEvents:] + 49
12 UIKit 0x0038e6b2 -[UISegmentedControl setSelectedSegmentIndex:] + 574
13 UIKit 0x0039317e -[UISegmentedControl touchesBegan:withEvent:] + 971
14 UIKit 0x002e5025 -[UIWindow _sendTouchesForEvent:] + 395
15 UIKit 0x002c637a -[UIApplication sendEvent:] + 447
16 UIKit 0x002cb732 _UIApplicationHandleEvent + 7576
17 GraphicsServices 0x016eda36 PurpleEventCallback + 1550
18 CoreFoundation 0x00d99064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
19 CoreFoundation 0x00cf96f7 __CFRunLoopDoSource1 + 215
20 CoreFoundation 0x00cf6983 __CFRunLoopRun + 979
21 CoreFoundation 0x00cf6240 CFRunLoopRunSpecific + 208
22 CoreFoundation 0x00cf6161 CFRunLoopRunInMode + 97
23 GraphicsServices 0x016ec268 GSEventRunModal + 217
24 GraphicsServices 0x016ec32d GSEventRun + 115
25 UIKit 0x002cf42e UIApplicationMain + 1160
26 tipApp 0x00002888 main + 102
27 tipApp 0x00002819 start + 53
)
terminate called after throwing an instance of 'NSException'
[Session started at 2011-02-25 01:26:59 -0500.]
答案 0 :(得分：3)
在-[tipAppViewController exact]方法中，您将isEqualToString:选择器发送给无法处理它的对象。
如果这没有帮助，可以发布exact方法的代码。
答案 1 :(得分：0)
您可以发布分段控件的代码吗？您是否尝试浏览UIScrollview上的子视图？这可能会导致抛出异常。退房：
http://wiresareobsolete.com/wordpress/2010/03/uiscrollview-has-a-secret/