Xcode警告 - addObject

Question

我正在使用以下方法：

-(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 = comment时，我收到以下错误，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'

我不确定我做错了什么......当qt等于滑块和textinput时它会起作用...

答案和问题类

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：请参阅更新代码，这是输出：

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

现在我甚至没有得到null。我的输出只是：

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似乎没有方法setAnswer。

确保

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

返回Answer类型的对象（它似乎是NSURLCache类型），然后检查answer的{​​{1}}属性是否具有setter方法。< / p>

编辑：要在不发布完整源代码的情况下解决此问题，请从头开始，逐步完成。通过这个，我的意思是按顺序回答以下内容：

1. Answer的类型是什么？
2. [questionArray objectAtIndex:currQNum-1]的类型是什么？
3. [[questionArray objectAtIndex:currQNum-1] question]的类型是什么？

Answer 2

也许Answer是NSURLCache的子类。在自定义子类标头和实现文件中，确保已定义并编写了名为-setAnswer:的选择器。要么是这样，要么确保在Answer中存储questionArray个实例，而不是NSURLCache个实例。

修改

以下内容：

@implementation Answer

@synthesize answer, questionId, entryId;

@end

应该充实。这就是Answer.m中的全部内容吗？