xCode CGContextSaveGState：無效的上下文0x0錯誤

我剛更新xCode爲7.0。我的代碼工作之前，但現在我得到：xCode CGContextSaveGState：無效的上下文0x0錯誤

CGContextSaveGState：無效的上下文0x0。如果你想看回溯，請設置CG_CONTEXT_SHOW_BACKTRACE環境變量。

在我的應用程序中，我有一個收件箱，一旦選擇了消息單元，就會顯示圖像/視頻。在信息顯示正常之前，但在更新之後，它們不再顯示。這是一個有效的錯誤或Apple錯誤？涉及的代碼放在下面。

InboxTableViewController.m

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { 
    self.selectedMessage = [self.messages objectAtIndex:indexPath.row]; 

    // mark message as read 
    NSMutableArray *readByIds = [NSMutableArray arrayWithArray:[self.selectedMessage objectForKey:@"readBy"]]; 

    if ([readByIds containsObject:[[PFUser currentUser] objectId]]) { 
     // message has already been read. do nothing 
    }else { 
     // message was unread. mark it as read now. 
     [readByIds addObject:[[PFUser currentUser] objectId]]; 
     [self.selectedMessage setObject:readByIds forKey:@"readBy"]; 
     [self.selectedMessage saveInBackground]; 
    } 


    NSString *fileType = [self.selectedMessage objectForKey:@"fileType"]; 
    if ([fileType isEqualToString:@"image"]) { 
     // file type is image 
     [self performSegueWithIdentifier:@"showImage" sender:self]; 
    } else { 
     // file type is video 
     PFFile *videoFile = [self.selectedMessage objectForKey:@"file"]; 
     NSURL *fileUrl = [NSURL URLWithString:videoFile.url]; 
     self.moviePlayer.contentURL = fileUrl; 
     [self.moviePlayer prepareToPlay]; 
     [self.moviePlayer thumbnailImageAtTime:0 timeOption:MPMovieTimeOptionNearestKeyFrame]; 

     // add it to the view controller so we can see it 
     [self.view addSubview:self.moviePlayer.view]; 
     [self.moviePlayer setFullscreen:YES animated:YES]; 
    } 

}

...

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 
    if ([segue.identifier isEqualToString:@"showLogin"]) { 
     LoginViewController *lvc = (LoginViewController *)segue.destinationViewController; 
     [lvc setHidesBottomBarWhenPushed:YES]; 
     lvc.navigationItem.hidesBackButton = YES; 
     //[segue.destinationViewController setHidesBottomBarWhenPushed:YES]; 
    } else if ([segue.identifier isEqualToString:@"showImage"]) { 
     ImageViewController *ivc = (ImageViewController *)segue.destinationViewController; 
     [ivc setHidesBottomBarWhenPushed:YES]; 
     ivc.message = self.selectedMessage; 
    } 
}

ImageViewController.m

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    NSString *senderName = [self.message objectForKey:@"senderFullName"]; 
    self.navigationItem.title = senderName; 

    // download image from Parse.com 
    PFFile *imageFile = [self.message objectForKey:@"file"]; 
    NSURL *imageFileUrl = [[NSURL alloc] initWithString:imageFile.url]; 
    NSData *imageData = [NSData dataWithContentsOfURL:imageFileUrl]; 

    //set the image view to the message image 
    self.imageView.image = [UIImage imageWithData:imageData]; 
}

來源

2015-09-17 Dee Greene

你有沒有嘗試設置'CG_CONTEXT_SHOW_BACKTRACE'變量？ – Adam

我該如何去做呢？ –

它也可能是一個錯誤。請參閱[this]（http://stackoverflow.com/a/31887785/730701）。 – Adam

-6

在此之後link糾正了我的錯誤。

我用這個特別：

<key>NSAppTransportSecurity</key> 
<dict> 
    <!--Include to allow all connections (DANGER)--> 
    <key>NSAllowsArbitraryLoads</key> 
    <true/> 
</dict>

，並在我的info.plist中設置這些值

來源

2015-09-18 15:28:00

這與grapichs上下文有什麼關係？ – Mike97

這並不回答被問到的實際問題，它是關於** Graphics Context **，不是傳輸安全性 – Jojodmo

xCode CGContextSaveGState：無效的上下文0x0錯誤

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