iOS 颜色转换 (10进制<—>16进制)

/** 根据颜色获取RGB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)];
}
/** RGB转十六进制 */
- (NSArray *)getColorWithRgb:(NSArray *)array{
    int red,green,blue;
    [[NSScanner scannerWithString:[NSString stringWithFormat:@"%@",array[0]]] scanInt:&red];
    [[NSScanner scannerWithString:[NSString stringWithFormat:@"%@",array[1]]] scanInt:&green];
    [[NSScanner scannerWithString:[NSString stringWithFormat:@"%@",array[2]]] scanInt:&blue];
    NSMutableArray *rgbArray = @[@(red),@(green),@(blue)].mutableCopy;
    for (int i = 0; i < rgbArray.count; i++) {
        NSString *value = [NSString stringWithFormat:@"%02x",[rgbArray[i] intValue]];
        rgbArray[i] = value;
    }
    return @[[rgbArray componentsJoinedByString:@""],GetColor(red, green, blue, 1)];
}
/** 16进制转RGB */
- (NSArray *)getColor:(NSString *)hexColor {
    unsigned int red,green,blue;
    NSRange range;
    range.length = 2;
    range.location = 0;
    [[NSScanner scannerWithString:[hexColor substringWithRange:range]] scanHexInt:&red];
    range.location = 2;
    [[NSScanner scannerWithString:[hexColor substringWithRange:range]] scanHexInt:&green];
    range.location = 4;
    [[NSScanner scannerWithString:[hexColor substringWithRange:range]] scanHexInt:&blue];
    return @[@[@(red),@(green),@(blue)],GetColor(red, green, blue, 1)];
    
}

备注:以上代码部分来自网上文档