Question

我对这段代码有一个问题，我试图将一些数据保存到plist供以后使用，如果用户重新打开视图，它应该为我的视图中的每个段控件选择当前段。

然而，当我尝试保存信息时，它会在线路上崩溃

[array addObject:gender];

请帮助:)它给出了EXC_BAD_ACCESS

-(IBAction)genderSelection:(id)sender
{
    if([sender selectedSegmentIndex] == kSwitchesSegmentIndex)
    {
        gender = @"Male";
        //NSLog(gender);
    }
    else {
        gender = @"Female";
        //NSLog(gender);
    }

}

-(IBAction)contactTypeSelection:(id)sender
{
    if([sender selectedSegmentIndex] == kSwitchesSegmentIndex)
    {
        contactType = @"a";
        //NSLog(gender);
    }
    else {
        contactType = @"b";
        //NSLog(gender);
    }

}

-(IBAction)saveData:(id)sender
{
    NSMutableArray *array = [[NSMutableArray alloc] init];

    [array removeAllObjects];

    [array addObject:field1.text];
    [array addObject:field2.text];
    [array addObject:gender];
    [array addObject:contactType];

    [array writeToFile:[self dataFilePath] atomically:YES];
    [array release];
}

-(NSString *)dataFilePath
{
    NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectory = [path objectAtIndex:0];

    return [documentsDirectory stringByAppendingPathComponent:kFilename];
}

-(void)viewWillAppear:(BOOL)animated
{

    NSString *filePath = [self dataFilePath];

    if([[NSFileManager defaultManager] fileExistsAtPath:filePath])
    {
        NSArray *array = [[NSArray alloc] initWithContentsOfFile:filePath];

        field1.text = [array objectAtIndex:0];
        field2.text = [array objectAtIndex:1];

        gender = [array objectAtIndex:2];
        contactType = [array objectAtIndex:3];

        if([gender isEqualToString:@"Male"])
        {
            genderSegment.selectedSegmentIndex = 0;
        }
        else
        {
            genderSegment.selectedSegmentIndex = 1;
        }

        if([contactType isEqualToString:@"a"])
        {

        }
        else
        {

        }


        [array release];
    }
}

-(IBAction)textDone:(id)sender
{
    [sender resignFirstResponder];
}



- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)dealloc
{
    [gender release]; //need to release
    [contactType release]; //need to release
    [field1 release]; //need to release
    [field2 release]; //need to release
    [super dealloc];
}

- (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.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    gender = @"Male";
    contactType = @"a";
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

- (void)viewDidUnload
{
    gender = nil; //need to release
    contactType = nil; //need to release
    field1 = nil ; //need to release
    field2 = nil; //need to release
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

Answer 1

您没有初始化gender财产。你需要：

- (void)viewDidLoad
{

    [super viewDidLoad];

    self.gender=[[NSString alloc]init];

    self.gender = @"Male";

//so something here

    // Do any additional setup after loading the view from its nib.

}

注意：如果您使用@synthesize编译器指令，则需要在任何地方使用自带点表示法来引用属性，例如self.gender。

plist segment control保存问题

1 个答案: