TextViewWrap.swift

TextViewWrap.swift

import UIKit
import PlaygroundSupport

class TestViewController : UIViewController {
    
    let btn: UIButton = {
        let b = UIButton()
        b.translatesAutoresizingMaskIntoConstraints = false
        b.setTitle("Tap Me", for: .normal)
        b.backgroundColor = .red
        return b
    }()
    
    let scrollView: UIScrollView = {
        let v = UIScrollView()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.backgroundColor = .blue
        return v
    }()
    
    let scrollContentView: UIView = {
        let v = UIView()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.backgroundColor = .orange
        return v
    }()
    
    let stackView: UIStackView = {
        let v = UIStackView()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.backgroundColor = .green
        v.axis = .vertical
        v.alignment = .fill
        v.distribution = .fill
        v.spacing = 8.0
        return v
    }()
    
    let overviewTextView: UITextView = {
        let v = UITextView()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.isScrollEnabled = false
        v.backgroundColor = .yellow
        v.font = UIFont.systemFont(ofSize: 28.0)
        return v
    }()
    
    let labelBelow: UILabel = {
        let v = UILabel()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.backgroundColor = .cyan
        v.text = "Label below"
        v.font = UIFont.systemFont(ofSize: 28.0)
        return v
    }()
    
    var imageRect = CGRect(x: 0, y: 0, width: 140, height: 240)
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.addSubview(scrollView)

        scrollView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
        scrollView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
        scrollView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor).isActive = true
        scrollView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor).isActive = true

        scrollView.addSubview(scrollContentView)
        
        scrollContentView.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
        scrollContentView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor).isActive = true
        scrollContentView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor).isActive = true
        scrollContentView.widthAnchor.constraint(equalTo: scrollView.widthAnchor).isActive = true

        let scrollContentBottomConstraint = scrollContentView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor)
        scrollContentBottomConstraint.priority = .defaultLow
        scrollContentBottomConstraint.isActive = true
        
        scrollContentView.addSubview(stackView)
        
        stackView.topAnchor.constraint(equalTo: scrollContentView.topAnchor).isActive = true
        stackView.leadingAnchor.constraint(equalTo: scrollContentView.safeAreaLayoutGuide.leadingAnchor, constant: 8).isActive = true
        stackView.trailingAnchor.constraint(equalTo: scrollContentView.safeAreaLayoutGuide.trailingAnchor, constant: -8).isActive = true
        stackView.setContentHuggingPriority(.defaultLow, for: .horizontal)
        stackView.setContentHuggingPriority(.defaultLow, for: .vertical)
        stackView.setContentCompressionResistancePriority(.defaultHigh, for: .horizontal)
        stackView.setContentCompressionResistancePriority(.required, for: .vertical)
        
        let stackBottomConstraint = stackView.bottomAnchor.constraint(equalTo: scrollContentView.bottomAnchor)
        stackBottomConstraint.priority = .defaultLow
        stackBottomConstraint.isActive = true
        
        stackView.addArrangedSubview(btn)
        
        btn.addTarget(self, action: #selector(didTap(_:)), for: .touchUpInside)

        btn.heightAnchor.constraint(equalToConstant: 40).isActive = true

        stackView.addArrangedSubview(overviewTextView)

        overviewTextView.widthAnchor.constraint(equalTo: stackView.widthAnchor).isActive = true
        overviewTextView.setContentHuggingPriority(.defaultLow, for: .horizontal)
        overviewTextView.setContentHuggingPriority(.defaultHigh, for: .vertical)
        overviewTextView.setContentCompressionResistancePriority(.defaultHigh, for: .horizontal)
        overviewTextView.setContentCompressionResistancePriority(.required, for: .vertical)
        overviewTextView.text = "This is working fine to wrap the text, but here's the problem: I have the text view (lorem ipsum below) in a UIStackView with scrolling disabled, and I have items beneath it."
        
        stackView.addArrangedSubview(labelBelow)
        
        labelBelow.widthAnchor.constraint(equalTo: stackView.widthAnchor).isActive = true
    }
    
    @objc
    func didTap(_ sender: Any?) -> Void {
        if overviewTextView.textContainer.exclusionPaths.first != nil {
            overviewTextView.textContainer.exclusionPaths = []
        } else {
            let imageBezierPath = UIBezierPath(rect: imageRect)
            overviewTextView.textContainer.exclusionPaths = [imageBezierPath]
        }
        
        view.setNeedsLayout()
        view.layoutIfNeeded()
    }
    
}


let vc = TestViewController()
vc.view.backgroundColor = .white
PlaygroundPage.current.liveView = vc