CGContextFillRects: invalid context 0x0

[O-mkar]

i'm getting this error on iOS 9 Swift

: CGContextFillRects: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.

[bachonk]

Thanks @O-mkar. Do you have any relevant code or steps to reproduce?

[O-mkar]

@bachonk I found an alternative fix for the error till you fix
this is how you produce the error

var imageView = UIImageView()
                imageView.contentMode = .ScaleAspectFit
                imageView.clipsToBounds = true
                imageView.setImageWithString(name, color: nil, circular: false)
                imageView.frame = CGRect(x: 0, y: 0, width: 25, height: 25)
                view.addSubview(imageView)

[bachonk]

@O-mkar unfortunately, I'm still not seeing the issue on my end, but I'll continue to dig around. In the meantime, could you share what your alternative fix was?

[maheshcheliya]

when you set image in custom collection view cell, this issue will generated.

[ashusath]

I am also getting the same error, i am setting background image to UIButton in custom collection view cell

[mrublev]

The problem is using setImageWithString: when drawing context isn't ready. Try to move it into drawRect: or somewhere else, when image view's drawing context exists.

[YahyaBagia]

What I tried is to create a UIImageView through code as below and use it's image property when required (e.g. : cellForRowAtIndexpath for TableView or cellForItemAtIndexPath for CollectionView). And it worked well.

@property (nonatomic, retain) UIImageView *imgViewForAvatar;

_imgViewForAvatar = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 25, 25)];
[_imgViewForAvatar setImageWithString:_@"Name Here" color:[_utils getThemeColor] circular:YES fontName:@"Lato-Regular"];

cellForRowAtIndexpath:
_chatCell.chatUserImage.image = _imgViewForAvatar.image;

[zackshapiro]

@YahyaBagia I can confirm this works. It's hacky but it works.

I have my image view set up in the cell's init like so

        let profileImageView = PFImageView() // PFImageView is just a Parse-based subclass of UIImageView
        profileImageView.layer.cornerRadius = 25
        profileImageView.clipsToBounds = true
        profileImageView.isHidden = true
        contentHolderView.addSubview(profileImageView)
        constrain(profileImageView) {
            $0.width == CGFloat(50)
            $0.height == CGFloat(50)
            $0.bottom == $0.superview!.bottom - CGFloat(2)
            $0.left == $0.superview!.left + CGFloat(12)
        }
        self.profileImageView = profileImageView

Then in my view controller's cellForRowAtIndexPath:

                let cell = tableView.dequeueReusableCell(withIdentifier: "GroupMessageCell") as! GroupMessageCell

                img.setImage(withFile: nil, defaultText: message.senderUsername)
                cell.profileImageView?.image = img.image

               // other setup configuration

               return cell

Hopefully this can help someone else out