ios 从rgb array生成UIImage并显示,oc版

    const size_t Width = ;
    const size_t Height = ;
    const size_t Area = Width * Height;
    const size_t channles = ; // rgba
    std::vector<uint8_t> output(Area*channles);
    uint8_t *outputdata = output.data();

    // create the bitmap context:
    const size_t BitsPerComponent = ;
    const size_t BytesPerRow=((BitsPerComponent * Width) / ) * channles;
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef gtx = CGBitmapContextCreate(outputdata, Width, Height, BitsPerComponent, BytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast);

    // create the image:
    CGImageRef toCGImage = CGBitmapContextCreateImage(gtx);
    UIImage *image = [[UIImage alloc] initWithCGImage:toCGImage];

    [self.imageView setImage:image];