Question

Which one is better at runtime:
1)saving images of size 250X120 in sqlite.
2)Saving images of same size in document directory.
At two three places app needs these saved images to be shown in the control.
Also i am having requirement to show maximum of 20 images.

Answer 1

The second option is far better than first one. To accomplish second part use:

- (void)saveImage:(UIImage*)image:(NSString*)imageName
{
    NSData *imageData = UIImagePNGRepresentation(image); //convert image into .png format.

    NSFileManager *fileManager = [NSFileManager defaultManager];//create instance of NSFileManager

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //create an array and store result of our search for the documents directory in it

    NSString *documentsDirectory = [paths objectAtIndex:0]; //create NSString object, that holds our exact path to the documents directory

    NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", imageName]]; //add our image to the path 

    [fileManager createFileAtPath:fullPath contents:imageData attributes:nil]; //finally save the path (image)

    NSLog(@"image saved");
}