iOS截取屏幕(屏幕截图)

-(UIImage*)printscreen{    //以下是实现截屏功能    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, self.view.opaque, 0.0);    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];        UIImage * jieTuImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();        return jieTuImage;}