UIView转成图片-ios

//view转成Image
- (UIImage *)convertViewToImage:(UIView *)view {
    
    UIImage *imageRet = [[UIImage alloc]init];
//开启上下文 参数1：CGSize size 尺寸, 参数2：BOOL opaque 透明度, 参数3：CGFloat scale 比例
    UIGraphicsBeginImageContextWithOptions(view.frame.size, YES, [UIScreen mainScreen].scale);
//获取图像
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    imageRet = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return imageRet;
    
}

tableView scrollView可以滚动的控件转成图片

- (UIImage *)convertViewToImage {
    UIImage *image = nil;
   
    UIGraphicsBeginImageContextWithOptions(self.tableView.contentSize, YES, [UIScreen mainScreen].scale);
    CGPoint savedContentOffset = self.tableView.contentOffset;
    CGRect savedFrame = self.tableView.frame;
    self.tableView.contentOffset = CGPointZero;
    self.tableView.frame = CGRectMake(0, 0, self.tableView.contentSize.width, self.tableView.contentSize.height);
    [self.tableView.layer renderInContext:UIGraphicsGetCurrentContext()];
    image = UIGraphicsGetImageFromCurrentImageContext();
    self.tableView.contentOffset = savedContentOffset;
    self.tableView.frame = savedFrame;
    return image;
    
}