Xcode的警告 - ADDOBJECT

Question

我用下面的方法：

-(void) finishQuestionnaire:(id)sender{ 
    NSString * ans; 
    NSString* qt = [[[questionArray objectAtIndex:currQNum-1] question] qType];  
    if([qt isEqualToString:@"Slider"]){ 
     ans = [[[questionArray objectAtIndex:currQNum-1] sliderLabel]text]; 
    }else if([qt isEqualToString:@"Option"]){    

    }else if([qt isEqualToString:@"TextInput"]){ 
     ans = [[[questionArray objectAtIndex:currQNum-1] inputAnswer]text]; 
    }else if([qt isEqualToString:@"ImagePicker"]){ 

    }else if([qt isEqualToString:@"Comment"]){ 
     ans = [[[questionArray objectAtIndex:currQNum-1] inputAnswer]text];    
    } 
    //UPDATED 

NSLog(@"%@", [questionArray objectAtIndex:currQNum-1]); 
NSLog(@"%@", [[questionArray objectAtIndex:currQNum-1] question]); 
NSLog(@"%@", [[[questionArray objectAtIndex:currQNum-1] question] answer]); 

    //[self.navigationController popToRootViewControllerAnimated:YES]; 
} 

当QT =评论，我碰到下面的错误和应用程序崩溃：

2011-07-20 00:02:04.723 MainMenu[71393:207] -[NSURLCache setAnswer:]: unrecognized selector sent to instance 0x4e29280 
    2011-07-20 00:02:04.726 MainMenu[71393:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSURLCache setAnswer:]: unrecognized selector sent to instance 0x4e29280' 

我不知道是什么我做错了....它的工作原理，当QT等于滑块和TextInput ...

接听和问题类

import <Foundation/Foundation.h> 


@interface Answer : NSObject { 
    //NSString* answerId; 
    NSString* answer; 
    NSString* questionId; 
    NSString* entryId; 
} 

//@property (nonatomic, retain) NSString* answerId; 
@property (nonatomic, retain) NSString* answer; 
@property (nonatomic, retain) NSString* questionId; 
@property (nonatomic, retain) NSString* entryId; 

@end 


#import "Answer.h" 


@implementation Answer 

@synthesize answer, questionId, entryId; 

@end 

#import <Foundation/Foundation.h> 
#import "Answer.h" 

@interface Question : NSObject { 
    NSString* qId; 
    NSString* qTitle; 
    NSString* qNumber; 
    NSString* sectionId; 
    NSString* qType; 
    Answer* answer; 
} 

@property (nonatomic, retain) NSString* qId; 
@property (nonatomic, retain) NSString* qTitle; 
@property (nonatomic, retain) NSString* qNumber; 
@property (nonatomic, retain) NSString* sectionId; 
@property (nonatomic, retain) NSString* qType; 
@property (nonatomic, retain) Answer* answer; 

@end 


@implementation Question 
@synthesize qId, qTitle, qNumber, sectionId, qType, answer; 

-(id)init 
{ 
    if (self = [super init]) 
    { 
     // Initialization code here 
     answer = [[Answer alloc]init]; 
    } 
    return self; 
} 

-(void) dealloc{ 
    [answer release]; 
    [super dealloc]; 
} 

编辑：看到更新代码，这里是输出：

2011-07-20 01:21:04.402 MainMenu[71910:207] <CommentQuestionViewController: 0x4e0b100> 
2011-07-20 01:21:04.404 MainMenu[71910:207] <Question: 0x4e55170> 
2011-07-20 01:21:04.404 MainMenu[71910:207] (null) 

更新：

现在，我还没有得到空。我的输出就是：

2011-07-20 01:21:04.402 MainMenu[71910:207] <CommentQuestionViewController: 0x4e0b100> 
2011-07-20 01:21:04.404 MainMenu[71910:207] <Question: 0x4e55170> 

Answer 1

您的自定义类型Answer没有出现有一种方法setAnswer。

确保

[[[questionArray objectAtIndex:currQNum-1] question] answer]; 

返回Answer类型（它似乎是NSURLCache类型的）的一个对象，然后检查的Answeranswer的属性有setter方法。

编辑：为了解决这个问题，没有发布你的整个源代码，从一开始就开始工作。通过这个，我的意思是回答如下，按顺序：

1. 什么类型是[questionArray objectAtIndex:currQNum-1]？
2. 什么类型是[[questionArray objectAtIndex:currQNum-1] question]？
3. 什么类型是[[[questionArray objectAtIndex:currQNum-1] question] answer]？

Answer 2

也许Answer是NSURLCache的子类。在您的自定义子类头文件和实现文件中，确保已经定义并写入了一个名为-setAnswer:的选择器。要么是这样，要么确保在questionArray中存储Answer实例，而不是NSURLCache实例。

编辑

以下：

@implementation Answer 

@synthesize answer, questionId, entryId; 

@end 

应充实。这是你在Answer.m？