iphone - 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，我收到以下错误并且应用程序崩溃:

 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 slider 和文本输入时它工作......

答题课

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:查看更新代码，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:

现在我什至没有得到空值。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 Answer 的属性(property)有一个setter方法。

编辑:要在不发布整个源代码的情况下解决此问题，请从头开始并逐步进行。我的意思是按顺序回答以下问题:

[questionArray objectAtIndex:currQNum-1]是什么类型的?

[[questionArray objectAtIndex:currQNum-1] question]是什么类型的?

[[[questionArray objectAtIndex:currQNum-1] question] answer]是什么类型的?