fill the image in imageView according to fit width, and auto height

        self.artworkView.contentMode = UIViewContentModeScaleAspectFill;

        [self.artworkView makeConstraints:^(MASConstraintMaker *make) {
            make.centerX.equalTo(self.superview.centerX);
            make.centerY.equalTo(self.superview.centerY);
            make.width.equalTo(self.superview.width);
        }];