iOS颜色转换

各种颜色之间的转换，会陆续更新，

HEX颜色转UIColor

- (UIColor*)ConvertWith:(NSInteger)RGB  Alpha:(CGFloat)a
{
    NSInteger r = (RGB & 0xFF0000) >> 16;
    NSInteger G = (RGB & 0xFF00) >> 8;
    NSInteger B = (RGB & 0xFF);
    UIColor * color = [[UIColor alloc]initWithRed:r green:G blue:B alpha:a];
    return color;
}