Showing actionsheet causes CGContext invalid context errors

Showing actionsheet causes CGContext invalid context errors

I'm using actionsheet to display lists of data for the user to choose
from. The problem is that showing the actionsheet using [self.actionSheet
showInView:self.view]; is causing several CGContext errors. The same code
worked well in iOS 6.
Code:
self.actionSheet = [[UIActionSheet alloc] initWithTitle:nil
delegate:nil
cancelButtonTitle:nil
destructiveButtonTitle:nil
otherButtonTitles:nil];
[self.actionSheet setActionSheetStyle:UIActionSheetStyleBlackOpaque];
CGRect tableFrame = CGRectMake(0, 40, 320, 214);
self.tableView = [[UITableView alloc] initWithFrame:tableFrame
style:UITableViewStylePlain];
self.tableView.dataSource = self;
self.tableView.delegate = self;
[self.actionSheet addSubview:self.tableView];
UISegmentedControl *closeButton = [[UISegmentedControl alloc]
initWithItems:[NSArray arrayWithObject:@"Done"]];
closeButton.momentary = YES;
closeButton.frame = CGRectMake(260, 7.0f, 50.0f, 30.0f);
closeButton.tintColor = [UIColor redColor];
[closeButton addTarget:self action:@selector(dismissActionSheet:)
forControlEvents:UIControlEventValueChanged];
[self.actionSheet addSubview:closeButton];
[self.actionSheet showFromView:self.view];
[UIView beginAnimations:nil context:nil];
[self.actionSheet setBounds:CGRectMake(0, 0, 320, 485)];
[UIView commitAnimations];
Errors:
CGContextSetFillColorWithColor: invalid context 0x0. This is a serious
error. This application, or a library it uses, is using an invalid context
and is thereby contributing to an overall degradation of system stability
and reliability. This notice is a courtesy: please fix this problem. It
will become a fatal error in an upcoming update.
CGContextSetStrokeColorWithColor: invalid context 0x0. This is a serious
error. This application, or a library it uses, is using an invalid context
and is thereby contributing to an overall degradation of system stability
and reliability. This notice is a courtesy: please fix this problem. It
will become a fatal error in an upcoming update.
CGContextSaveGState: invalid context 0x0. This is a serious error. This
application, or a library it uses, is using an invalid context and is
thereby contributing to an overall degradation of system stability and
reliability. This notice is a courtesy: please fix this problem. It will
become a fatal error in an upcoming update.
CGContextSetFlatness: invalid context 0x0. This is a serious error. This
application, or a library it uses, is using an invalid context and is
thereby contributing to an overall degradation of system stability and
reliability. This notice is a courtesy: please fix this problem. It will
become a fatal error in an upcoming update.
CGContextAddPath: invalid context 0x0. This is a serious error. This
application, or a library it uses, is using an invalid context and is
thereby contributing to an overall degradation of system stability and
reliability. This notice is a courtesy: please fix this problem. It will
become a fatal error in an upcoming update.
CGContextDrawPath: invalid context 0x0. This is a serious error. This
application, or a library it uses, is using an invalid context and is
thereby contributing to an overall degradation of system stability and
reliability. This notice is a courtesy: please fix this problem. It will
become a fatal error in an upcoming update.
CGContextRestoreGState: invalid context 0x0. This is a serious error. This
application, or a library it uses, is using an invalid context and is
thereby contributing to an overall degradation of system stability and
reliability. This notice is a courtesy: please fix this problem. It will
become a fatal error in an upcoming update.
The original code came from another stackoverflow answer, see
http://stackoverflow.com/a/2074451/654870.