How to get image( using CGContext ) from the tableviewcell when tapped on the cell in iOS SDK

问题

How to get imaged using CGContext same as the tableviewcell that I Tapped. I got the frame of the cell which I tapped. I had seen many examples of CGContext it only takes the size as the input and converting the image into that size.

But I want to get the Image of the tableviewcell as it is with the same frame. Can anyone suggest me how can I do this.

回答1:

I guess You need to club these two logic in appropriate place after your cell is being tapped. There is a method - (CGRect)rectForRowAtIndexPath:(NSIndexPath *)indexPath; to get the CGRect of your current cell.

Find the CGRect of the UITableViewCell being clicked.

Get the CGSzie from the CGRect of step 1.

-(UIImage *) screenshot:(CGRect )cellRect onCell:(UITableViewCell)cell
 {
   UIGraphicsBeginImageContext(cellRect.size);

   CGContextRef context=UIGraphicsGetCurrentContext();
   [cell.layer renderInContext:context];

   UIImage *image=UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();

   return image;
 }

This should solve your problem, may need a few tweaks.

Here is usage:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

UIImageView *imageV = [[UIImageView alloc]initWithImage:[self screenshot:[tableView rectForRowAtIndexPath:indexPath] onCell:[tableView cellForRowAtIndexPath:indexPath]]];
imageV.frame = CGRectMake(0, 75, self.tableView.frame.size.width,100);

UIViewController *viewController = [[UIViewController alloc]init];
[viewController.view addSubview:imageV];

UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:viewController];
[self presentViewController:nav animated:YES completion:^{
}];

}

Screens : Selected row 1