get the color of a pixel in an UIView

ColorOfPixelInUIView

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint loc = [touch locationInView:self];
    self.pickedColor = [self colorOfPoint:loc];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"ColorPicked" object:self userInfo:nil];
}