I used some code to capture WebGL images from a webpage. It works fine on iOS 16 and above, but the images generated in iOS 16 and below are black. Can someone help me solve this problem? UIGraphicsBeginImageContextWithOptions(CGSizeMake(self.recordView.frame.size.width, self.recordView.frame.size.height), NO, scale); CGContextRef ctx = UIGraphicsGetCurrentContext(); if (!ctx) { NSLog(@"error"); } [self.recordView drawViewHierarchyInRect:CGRectMake(0, 0, self.recordView.frame.size.width, self.recordView.frame.size.height) afterScreenUpdates:YES]; UIImage *vImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();