-(BOOL)firstColor:(UIColor*)firstColor secondColor:(UIColor*)secondColor
{
    if (CGColorEqualToColor(firstColor.CGColor, secondColor.CGColor))
    {
        NSLog(@"顏色相同");
        return YES;
    }
    else
    {
        NSLog(@"顏色不同");
        return NO;
    }
}

適用于:
1.控件的顏色與UIColor的判斷

  [self firstColor:_startButton.backgroundColor secondColor:[UIColor redColor]];

2.控件之間的顏色判斷

  [self firstColor:_startButton.backgroundColor secondColor:_closeButton.backgroundColor];