- (NSDictionary *)getRGBDictionaryByColor:(UIColor *)originColor

{

 CGFloat r=0,g=0,b=0,a=0;

 if ([self respondsToSelector:@selector(getRed:green:blue:alpha:)]) {

    [originColorgetRed:&r green:&gblue:&b alpha:&a];

  }

 else {

   const CGFloat *components =CGColorGetComponents(originColor.CGColor);

    r = components[0];

    g = components[1];

    b = components[2];

    a = components[3];

  }

 return @{@"R":@(r),

          @"G":@(g),

          @"B":@(b),

          @"A":@(a)};

}

iOS获取UIColor对象的RGB值