Screen capture for iOS [duplicate]

Answer 1

I think you can capture the layer of self.view because it the root view

if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
    //Retina display
    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, [UIScreen mainScreen].scale);
} else {
    UIGraphicsBeginImageContext(self.view.bounds.size);
}
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Have fun!