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忍受我在這一個。iPhone應用程序錯誤問題
我有一個iphone應用程序。這是一個問卷調查應用程序。有幾種類型的問題，一些有滑塊，一些有文本輸入等。我已經爲每種類型的問題開發了一個視圖控制器。
問題控制器的兩個示例類型是：TextInputQuestionViewController和SliderQuestionViewController。
我有一個名爲QuestionnaireViewController的rootViewcontroller。這是定義如下：
#import <UIKit/UIKit.h>
#import "JSONKit.h";
#import "dbConnector.h"
#import "SliderQuestionViewController.h";
#import "TextInputQuestionViewController.h";
#import "MainMenuProtocol.h";
@interface QuestionnaireViewController : UIViewController {
NSDictionary* questions;
NSMutableArray* questionArray;
NSMutableArray* answerArray;
dbConnector* db;
SliderQuestionViewController* currQ; //need to create a generic var
TextInputQuestionViewController* currQ;
NSInteger currQNum;
NSString* qaTitle;
NSString* secId;
id<MainMenuProtocol>delegate;
}
@property(nonatomic, retain) NSDictionary* questions;
@property(nonatomic, retain) NSMutableArray* questionArray;
@property(nonatomic, retain) NSMutableArray* answerArray;
@property(nonatomic, retain) dbConnector* db;
@property(nonatomic, retain) SliderQuestionViewController* currQ;
@property(nonatomic, retain) TextInputQuestionViewController* currTI;
@property(nonatomic) NSInteger currQNum;
@property(nonatomic, retain) NSString* qaTitle;
@property(nonatomic, retain) NSString* secId;
@property(nonatomic, retain) id <MainMenuProtocol> delegate;
-(void) setQuestions;
-(void) startQuestion:(NSInteger)index isLast:(BOOL)last;
-(void) loadQuestions;
-(void) initialise;
-(void) finishQuestionnaire:(id)sender;
-(void) switchViews:(id)sender;
@end
#import "QuestionnaireViewController.h"
#import "dbConnector.h"
#import "ASIHTTPRequest.h"
#import "JSONKit.h";
#import "Answer.h";
@implementation QuestionnaireViewController
@synthesize questions, questionArray, db, currQ, currQNum, answerArray, qaTitle, secId, delegate;
-(void)viewDidLoad{
[self initialise];
answerArray = [[NSMutableArray alloc]init];
[super viewDidLoad];
self.title = qaTitle; //set to whatever section is
}
-(void) initialise {
currQNum = 0;
[self loadQuestions];
UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:@"Start" style:UIBarButtonItemStylePlain target:self action:@selector(switchViews:)];
self.navigationItem.rightBarButtonItem = anotherButton;
}
-(void) loadQuestions {
db = [[dbConnector alloc]init];
//code to initialise view
[db getQuestions:secId from:@"http://dev.speechlink.co.uk/David/get_questions.php" respondToDelegate:self];
}
//called when questions finished loading
//stores dictionary of questions
- (void)requestFinished:(ASIHTTPRequest *)request
{
NSData *responseData = [request responseData];
NSString *json = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSDictionary *qs = [json objectFromJSONString];
self.questions = qs;
[json release];
[qs release];
[self setQuestions];
}
//assigns JSON to question objects
-(void) setQuestions {
questionArray = [[NSMutableArray alloc] init];
for (NSDictionary *q in self.questions) {
/* Create Question object and populate it */
id question;
if([[q objectForKey:@"type"] isEqualToString:@"Slider"]){
question = [[SliderQuestionViewController alloc]init];
//set min max values
}else if([[q objectForKey:@"type"] isEqualToString:@"Option"]){
}else if([[q objectForKey:@"type"] isEqualToString:@"TextInput"]){
question = [[TextInputQuestionViewController alloc]init];
}else if([[q objectForKey:@"type"] isEqualToString:@"ImagePicker"]){
}else{
//comments
}
//if else to create appropriate view controller - NEED to identify question type
[question setQuestionId:[q objectForKey:@"questionId"] withTitle:[q objectForKey:@"question"] number:[q objectForKey:@"questionNumber"] section:[q objectForKey:@"sectionId"] questionType: [q objectForKey:@"type"]];
/* Add it to question (mutable) array */
[questionArray addObject:question];
[question release];
}
}
-(void) startQuestion:(NSInteger)index isLast:(BOOL)last{
//currQ = [[QuestionViewController alloc]init];
currQ = [questionArray objectAtIndex:index];
//push currQ onto navigationcontroller stack
[self.navigationController pushViewController:currQ animated:YES];
[currQ addButton:self isLast: last];
}
//pushes new view onto navigation controller stack
-(void) switchViews:(id)sender{
Answer* ans = currQ.question.answer;
ans.questionId = currQ.question.qId;
ans.entryId = @"1";//temporary;
if(currQNum < [questionArray count] - 1){
if(currQNum > 0){
//if else for different input types
NSString* qt = currQ.question.qType;
if([qt isEqualToString:@"Slider"]){
ans.answer = currQ.sliderLabel.text;
}else if([qt isEqualToString:@"Option"]){
}else if([qt isEqualToString:@"TextInput"]){
//NSLog(@"%@", currQ.inputAnswer);
ans.answer = currQ.inputAnswer.text;
}else if([qt isEqualToString:@"ImagePicker"]){
}else{
}
[answerArray addObject: ans];
[ans release];
}
[self startQuestion:currQNum isLast:FALSE];
currQNum++;
}else{
ans.answer = currQ.sliderLabel.text;
[answerArray addObject: ans];
//store data temporarily - section finished
[self startQuestion:currQNum isLast:TRUE];
currQNum++;
}
[ans release];
}
-(void) finishQuestionnaire:(id)sender{
//go back to main manual
//if else statement for answers
NSString* answ = currQ.sliderLabel.text;
[answerArray addObject: answ];
[delegate finishedSection:answerArray section:secId];
[answ release];
[self.navigationController popToRootViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
self.questions = nil;
self.currQ = nil;
[super viewDidUnload];
}
//hide back button in navigation bar
- (void) viewWillAppear:(BOOL)animated{
self.navigationItem.hidesBackButton = YES;
}
- (void)dealloc {
[currQ release];
[db release];
[questionArray release];
[questions release];
[super dealloc];
}
@end
有問題的行與上述是在switchViews函數。我需要讓答案等於該問題視圖中的特定輸入組件（滑塊值，文本輸入值）。所以我需要使currQ成爲可以使用任何視圖控制器實例化的類型。
因此，我需要一個通用變量來保存當前問題。 currQ持有當前的問題，但目前是SliderQuestionViewController類型。我試圖將其更改爲id，但它引發了「請求成員...不是聯合結構」的負載，還有一些錯誤分配的指針問題。
讓我知道你是否需要更多的代碼。
[Generic Type In Objective C]的可能重複（http://stackoverflow.com/questions/6740873/generic-type-in-objective-c） –