CGImage of UIImage return NULL

Question

I created a function for splitting an image into multiple images, but when I take take the CGImage of the UIImage, the CGImage returns NULL

NSArray* splitIma         


        

Answer 1

What you did now is just create pieces with 0.f width, you should use two fors to define the width & height for your pieces. Code sample like this (not tested yet, but it should works):

for (int height = 0; height < image.size.height; height += piecesSize) {
  for (int width = 0; width < image.size.width; width += piecesSize) {
    CGRect subFrame = CGRectMake(width, height, piecesSize, piecesSize);

    CGImageRef newImage = CGImageCreateWithImageInRect(image.CGImage, subFrame);
    UIImage * finalImage = [UIImage imageWithCGImage:newImage];
    CGImageRelease(newImage);

    [tempArray addObject:finalImage];
  }
}