import Foundation

class ViewWithDynamicWidthScrollingView: UIView {
    
    convenience init() {
        self.init(frame: CGRectMake(0, 0, UIScreen.mainScreen().bounds.width, UIScreen.mainScreen().bounds.height))
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        self.setupHierarchy()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.setupHierarchy()
    }

    private func setupHierarchy() {
        let scrollView = UIScrollView()
        scrollView.backgroundColor = UIColor.whiteColor()
        addSubview(scrollView)
        scrollView.snp_makeConstraints { make in
            make.edges.equalTo(self)
        }
        
        let contentView = UIView()
        scrollView.addSubview(contentView)
        // This is the important part
        contentView.snp_makeConstraints { make in
            make.edges.equalTo(scrollView)
            make.width.equalTo(self)
        }
        
        // Make sure each view contained by the content view
        // has an height (intrisic or specified)
        
        let blackView = UIView()
        blackView.backgroundColor = UIColor.blackColor()
        contentView.addSubview(blackView)
        blackView.snp_makeConstraints { make in
            // The first child view must be pinned to the top
            // of the content view
            make.top.width.equalTo(contentView)
            make.height.equalTo(1000)
        }
        
        let redView = UIView()
        redView.backgroundColor = UIColor.redColor()
        contentView.addSubview(redView)
        redView.snp_makeConstraints { make in
            make.top.equalTo(blackView.snp_bottom)
            make.width.equalTo(contentView)
            make.height.equalTo(1000)
            // The last child view must be pinned to the bottom
            // of the content view
            make.bottom.equalTo(contentView.snp_bottom)
        }
        
    }
    
}