xCode CGContextSaveGState:无效的上下文0x0错误 [英] xCode CGContextSaveGState: invalid context 0x0 Error
问题描述
我刚刚将xCode更新为7.0。我的代码以前工作过,但现在我得到了:
I just updated xCode to 7.0. My code was working before but now am I getting:
CGContextSaveGState:无效上下文0x0。如果要查看回溯,请设置CG_CONTEXT_SHOW_BACKTRACE环境变量。
CGContextSaveGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
在我的应用程序中,我有一个显示图像/视频的收件箱一旦选择了消息单元格。在消息显示正常之前,但在更新后它们不再显示。这是有效错误还是Apple错误?涉及的代码位于下面。
In my application I have an inbox that displays an image/video once the message cell is selected. Before the messages were displaying fine but upon updating they no longer show. Is this a valid error or an Apple bug? The involved code is placed below.
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];
}
推荐答案
跟随链接更正了我的错误。
我特别使用了它:
<key>NSAppTransportSecurity</key>
<dict>
<!--Include to allow all connections (DANGER)-->
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
并将这些值设置在我的info.plist
and set these values in my info.plist
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