Objective c 发送到自定义类实例的选择器无法识别
下面是类标题:Objective c 发送到自定义类实例的选择器无法识别,objective-c,xcode,Objective C,Xcode,下面是类标题: @interface ChallengeItem : NSObject ....... - (NSString *) getAlertIntervalInString; - (void) createReminder; @end some implementation in .m file: - (NSString *) getAlertIntervalInString { ... do something } - (void)createReminder { ...
@interface ChallengeItem : NSObject
.......
- (NSString *) getAlertIntervalInString;
- (void) createReminder;
@end
some implementation in .m file:
- (NSString *) getAlertIntervalInString {
... do something
}
- (void)createReminder {
... do something
}
我打电话
for (int i = 0; i < [self count]; i++) {
ChallengeItem *currentItem = [self getChallengeAtIndex:i];
if (currentItem.isStarted) {
[currentItem createReminder];
}
}
到
没有出现错误。
有什么问题
这是控制台日志
当前语言:自动;当前目标-c 2011-11-23 00:56:40.056
30天挑战[379:12b03]-[ChallengeItem createReminder]:已将无法识别的选择器发送到实例0x6079900 2011-11-23 00:56:40.147 30天挑战[379:12b03]*由于以下原因终止应用程序 未捕获异常“NSInvalidArgumentException”,原因: '-[ChallengeItem createReminder]:无法识别的选择器已发送到 实例0x6079900' *第一次抛出时调用堆栈:
我看不出你的代码有任何明显的问题。为了确保
getChallengeAtIndex
实际上正在返回ChallengeItem
实例,您可以在该行设置断点并检查返回的值。安装新版本的XCode后,问题将消失。我们可以从控制台查看实际的崩溃日志吗?显示getChallengeAtIndex的代码-(ChallengeItem*)getChallengeAtIndex:(NSInteger)index{return[self.challenges objectAtIndex:index];}我会检查它,getChallengeAtIndex返回正常实例。如果我将函数createReminder更改为一些已经实现的函数,它会工作,但如果我调用createReminder或向类添加新函数,它会导致错误:(
[currentItem createReminder];
[currentItem getAlertIntervalInString];
(
0 CoreFoundation 0x00fb35a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x01107313 objc_exception_throw + 44
2 CoreFoundation 0x00fb50bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x00f24966 ___forwarding___ + 966
4 CoreFoundation 0x00f24522 _CF_forwarding_prep_0 + 50
5 30 Day Challenge 0x00006950 -[ChallengeCollection setRemindersForStartedChallenges] + 144
6 30 Day Challenge 0x00002f27 -[_0_Day_ChallengeAppDelegate applicationDidEnterBackground:] + 151
7 UIKit 0x00209a40 -[UIApplication _handleApplicationSuspend:eventInfo:] + 607
8 UIKit 0x00213039 -[UIApplication handleEvent:withNewEvent:] + 4127
9 UIKit 0x0020aabf -[UIApplication sendEvent:] + 71
10 UIKit 0x0020ff2e _UIApplicationHandleEvent + 7576
11 GraphicsServices 0x01712992 PurpleEventCallback + 1550
12 CoreFoundation 0x00f94944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
13 CoreFoundation 0x00ef4cf7 __CFRunLoopDoSource1 + 215
14 CoreFoundation 0x00ef1f83 __CFRunLoopRun + 979
15 CoreFoundation 0x00ef1840 CFRunLoopRunSpecific + 208
16 CoreFoundation 0x00ef1761 CFRunLoopRunInMode + 97
17 GraphicsServices 0x017111c4 GSEventRunModal + 217
18 GraphicsServices 0x01711289 GSEventRun + 115
19 UIKit 0x00213c93 UIApplicationMain + 1160
20 30 Day Challenge 0x00002059 main + 121
21 30 Day Challenge 0x00001fd5 start + 53
22 ??? 0x00000001 0x0 + 1
)
terminate called throwing an exception(gdb)