根据UIColor对象,获取对应的RGBA值

- (NSArray *)getRGBWithColor:(UIColor *)color

{

    CGFloat red = 0.0;

    CGFloat green = 0.0;

    CGFloat blue = 0.0;

    CGFloat alpha = 0.0;

    [color getRed:&red green:&green blue:&blue alpha:&alpha];

    return @[@(red), @(green), @(blue), @(alpha)];

}