Question

我遇到了问题，我不知道如何解决它。这就是我尝试做的事情：用户从他的iphone上的专辑中挑选一张图片。当图像将保存在应用程序文件夹中时，应弹出一个操作表，其上有一个活动指示器，直到保存过程完成。下面你可以看到我是如何尝试的，但我认为我的代码会导致内存问题（EXC_BAD_ACCESS），但我无法修复它。

当我调试时，我发现，下面列出的两种方法都会在一个循环中被调用，这就是让我最困惑的。

提前感谢您的帮助。

肖恩

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage* img = [info objectForKey:UIImagePickerControllerOriginalImage];
    img = [self rotateImage:img byOrientationFlag:img.imageOrientation];

    NSMutableArray *args = [[NSMutableArray alloc] init];

    activityLoadImage = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(-17.5, -11, 35, 35)];
    activityLoadImage.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
    activityLoadImage.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin |
                                      UIViewAutoresizingFlexibleRightMargin |
                                      UIViewAutoresizingFlexibleTopMargin |
                                      UIViewAutoresizingFlexibleBottomMargin);


    actionSheetLoadImage = [[UIActionSheet alloc] initWithTitle:@""
                                                   delegate:self
                                          cancelButtonTitle:nil
                                     destructiveButtonTitle:nil
                                          otherButtonTitles:nil];
    actionSheetLoadImage.actionSheetStyle = UIBarStyleBlackOpaque;

    [actionSheetLoadImage setMessage:NSLocalizedString(@"_LoadImage", @"loading image")];
    [actionSheetLoadImage addSubview:activityLoadImage];
    [actionSheetLoadImage showInView:self.view];
    [actionSheetLoadImage setBounds:CGRectMake(0,-105,320,720)];

    [args insertObject:picker atIndex:0];
    [args insertObject:img atIndex:1];
    [args insertObject:[info objectForKey:UIImagePickerControllerOriginalImage] atIndex:2];

    [activityLoadImage performSelectorOnMainThread:@selector(startAnimating) withObject:nil waitUntilDone:NO];
    [self performSelector:@selector(saveImage:) withObject:args afterDelay:0.1];
    [args release];
}

- (void)saveImage:(NSMutableArray *)arguments
{   
    UIImagePickerController *picker = [[arguments objectAtIndex:0] retain];
    UIImage *img = [[arguments objectAtIndex:1] retain];
    UIImage *orgImg = [[arguments objectAtIndex:2] retain];

    // writes the image to specific location with the given file name
    NSData *imageData = [self getImageData:img];
    [imageData writeToFile:[self getImagePath] atomically:YES];

    // writes the small image to specific location with the given file name
    imageData = [self getSmallImageData:img];
    [imageData writeToFile:[self getSmallImagePath] atomically:YES];

    // sets UIImage for the UIImageView
    [self setViewInfo];
    lblNoImage.hidden = TRUE;

    [[picker parentViewController] dismissModalViewControllerAnimated:YES];
    [self.tableView reloadData];

    [activityLoadImage performSelectorOnMainThread:@selector(stopAnimating) withObject:nil wait    UntilDone:NO];
    [actionSheetLoadImage dismissWithClickedButtonIndex:0 animated:YES];
    [activityLoadImage release];
    [actionSheetLoadImage release];
}

Answer 1

您将args传递给saveImage然后释放它。由于该方法在执行之前等待0.1秒，因此args已经被释放。尝试不释放args以查看是否可以解决您的问题，然后考虑更好的方法来管理内存，可能将其保留为类的属性。

执行选择器的内存问题 - iPhone

1 个答案: