Missing grid view

[mnfro]

Hi @eonist , great job with this repo, it looks pretty neat. Apart from the possibility to add filters, one thing which is also missing is a grid view. I can't issue a PR right now, but here is the code:

class GridView: UIView {
    
    @objc public var color: UIColor = UIColor.white.withAlphaComponent(0.5) {
        didSet {
            self.setNeedsDisplay()
        }
    }
    
    @objc public override init(frame: CGRect) {
        super.init(frame: frame)
        self.setupView()
    }
    
    @objc public required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.setupView()
    }
    
    private func setupView() {
        self.backgroundColor = UIColor.clear
    }
    
    private override func draw(_ rect: CGRect) {
        super.draw(rect)
        
        guard let context = UIGraphicsGetCurrentContext() else {
            return
        }
        
        context.setStrokeColor(self.color.cgColor)
        context.setLineWidth(1.0)
        
        let pairs: [[CGPoint]] = [
            [CGPoint(x: rect.width / 3.0, y: rect.minY), CGPoint(x: rect.width / 3.0, y: rect.maxY)],
            [CGPoint(x: 2 * rect.width / 3.0, y: rect.minY), CGPoint(x: 2 * rect.width / 3.0, y: rect.maxY)],
            [CGPoint(x: rect.minX, y: rect.height / 3.0), CGPoint(x: rect.maxX, y: rect.height / 3.0)],
            [CGPoint(x: rect.minX, y: 2 * rect.height / 3.0), CGPoint(x: rect.maxX, y: 2 * rect.height / 3.0)]
        ]
        
        for pair in pairs {
            context.addLines(between: pair)
        }
        
        context.strokePath()
    }
}

It is a rule-of-third grid, the most common we can find in any camera app.

If added to the camera view as a subview should not interfere with any gesture recognizer. What's more, a simple UIButton can be used to hide or show the grid.

Cheers!

p.s I'm a master of crooked photos.

[eonist]

Awesome!

• I would suggest making it a module. Similar to when we added: https://github.com/eonist/ZoomSwitcherKit and add it via SPM
• This way people can cherry pick which components they want to include etc