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)];

}