Core Graphics Crash

Please, note that just posting a crash report is not the right thing to do. In addition, it is not very respectful to readers to dump a raw crash report without any information.

So, please:

- explain the context

- remind the XCode and iOS version

- post the code where the crash occurs

- precise the exact line of crash.

Sorry man, I forgot the details

1. Context

I'm trying to render a UILabel's layer using - (void)drawInContext:(CGContextRef)ctx;

and the properties of the label (such as textColor、attributedText) may be changed under some circumstances.

2. Environments

Xcode 10.2.1

iOS 12.1.2

3. Simplified Code

    UILabel *someLabel = [[UILabel alloc] init];
    // setting attributes
    someLabel.text = @"hello, world";
    CGSize size = CGSizeMake(50, 20);
    someLabel.frame = CGRectMake(0, 0, size.width, size.height);
    someLabel.textColor = [UIColor whiteColor]; // textColor may be modified in other scenarios
    someLabel.attributedText = ....             // attributedText may be modified in other scenarios

    UIGraphicsBeginImageContextWithOptions(size, 0, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [someLabel.layer drawInContext:context]; // crashed here
    UIImage *screenShot = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

I'm not very fluent with objc, but:

Try with a Float scale.

callling:

CGFloat scale = 0.0;
UIGraphicsBeginImageContextWithOptions(size, NO, scale);