應用在圖像捕獲時崩潰

Question

我正在通過相機捕獲圖像。 然后，我移到下一個控制器，在其中顯示捕獲的圖像。 我返回到捕獲圖像屏幕，此循環持續10到15次。 此后，當我嘗試捕獲圖像時，應用程序會由於發出“內存不足警告”而崩潰。 這是代碼：

- (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

不要在委托回調中釋放選擇器，而是在下一個運行循環中分派一個塊來執行它（您也可以在0之后使用performSelector）。

還可以使用Instruments ObjectAlloc和Leaks來查看未分配的內容。

Answer 2

您需要調整圖像大小然后使用它。從相機單擊的圖像約為 超過2 mb。嘗試調整從相機拍攝的圖像的大小，然后再使用它。 您需要做：-

- (void)imagePickerController:(UIImagePickerController *)picker 
        didFinishPickingImage:(UIImage *)image
                  editingInfo:(NSDictionary *)editingInfo{
UIGraphicsBeginImageContext(size);//640*920 or what ever you think appropriate 
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
    UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();
    [picker dismissModalViewControllerAnimated:NO];
    [picker release];
    picker =nil;
}
And now use finalImage instead of image