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- (UIImage *)rn_screenshot {    UIGraphicsBeginImageContext(CGSizeMake(SCREEN_WIDTH, SCREEN_HEIGHT));    if([self.view respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]){        [self.view drawViewHierarchyInRect:self.view.bounds afterScreenUpdates:NO];    }    else{        [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];    }    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    CGImageRef imageRef = image.CGImage;    CGRect rect =CGRectMake(0, SCREEN_HEIGHT - 357, SCREEN_WIDTH, 357);//这里可以设置想要截图的区域    CGImageRef imageRefRect =CGImageCreateWithImageInRect(imageRef, rect);    UIImage *sendImage = [[UIImage alloc] initWithCGImage:imageRefRect];    NSData *imageData = UIImageJPEGRepresentation(sendImage, 0.75);    image = [UIImage imageWithData:imageData];    return image;}