相关疑难解决方法(0)

我有一个UIImage(Cocoa Touch).从那以后,我很高兴得到一个CGImage或其他你想要的东西.我想写这个函数:

- (int)getRGBAFromImage:(UIImage *)image atX:(int)xx andY:(int)yy {
  // [...]
  // What do I want to read about to help
  // me fill in this bit, here?
  // [...]

  int result = (red << 24) | (green << 16) | (blue << 8) | alpha;
  return result;
}

谢谢!