iphone - 应用程序在图像捕获时崩溃

Question

我正在通过相机捕捉图像。然后我移动到下一个 Controller ，在那里我显示捕获的图像。我回去捕捉图像屏幕，这个循环持续 10 到 15 次。在此之后，当我 try catch 图像时，应用程序会通过发出“低内存警告”而崩溃。这是代码:

- (IBAction) takePhoto:(id) sender
{
    /*
    tempControl *intermediate=[[tempControl alloc] initWithNibName:@"tempControl" bundle:nil];
    [self.navigationController pushViewController:intermediate animated:YES];
    [intermediate release];
     */
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
        imagePickerController= [[UIImagePickerController alloc] init];
        [imagePickerController setMediaTypes:[NSArray arrayWithObjects:(NSString *)kUTTypeImage, nil]];
        imagePickerController.delegate = self;
        imagePickerController.sourceType =  UIImagePickerControllerSourceTypeCamera;

        [self presentModalViewController:imagePickerController animated:YES];
    }
    else{
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Camera Alert" message:@"Device Lacks Camera" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [alert show];
            [alert release];
            alert = nil;
    }
}

- (void)imagePickerController:(UIImagePickerController *)picker 
        didFinishPickingImage:(UIImage *)image
                  editingInfo:(NSDictionary *)editingInfo{

    [picker dismissModalViewControllerAnimated:NO];
    [picker release];
    picker =nil;
    /*
    cropReciept *recieptToCrop=[[cropReciept alloc] initWithNibName:@"cropReciept" bundle:nil];
    [recieptToCrop setReciept:image];
    [self.navigationController pushViewController:recieptToCrop animated:YES];
    [recieptToCrop release];
     */
    OCRDemoViewController *recieptToCrop=[[OCRDemoViewController alloc] initWithNibName:@"CropTestViewController" bundle:nil];
    [recieptToCrop setImageToCrop:image];
    if ([self.selectedTicketType isEqualToString:@"MAXI QuickPick"]) {
        recieptToCrop.selectedValueOfTicket=50;
        recieptToCrop.drawNumber=self.selectedDrawNumber;
    }
    else if ([self.selectedTicketType isEqualToString:@"JUMBO QuickPick"]) {
        recieptToCrop.selectedValueOfTicket=36;
        recieptToCrop.drawNumber=self.selectedDrawNumber;
    }
    else if ([self.selectedTicketType isEqualToString:@"MEGA QuickPick"]) {
        recieptToCrop.selectedValueOfTicket=24;
        recieptToCrop.drawNumber=self.selectedDrawNumber;
    }
    else if ([self.selectedTicketType isEqualToString:@"REGULAR QuickPick"]) {
        recieptToCrop.selectedValueOfTicket=12;
        recieptToCrop.drawNumber=self.selectedDrawNumber;
    }
    else if ([self.selectedTicketType isEqualToString:@"SUPER QuickPick"]) {
        recieptToCrop.selectedValueOfTicket=18;
        recieptToCrop.drawNumber=self.selectedDrawNumber;
    }

    [self.navigationController pushViewController:recieptToCrop animated:YES];
    [recieptToCrop release];
    recieptToCrop=nil;
}

Answer 1

不要在委托(delegate)回调中释放选择器，而是在下一个运行循环中分派(dispatch)一个 block 来完成它(你也可以在:0 之后使用 performSelector)。

还可以使用 Instruments ObjectAlloc 和 Leaks 查看未释放的内容。