//
//  ViewController.swift
//  Render
//
//  Created by ForC on 2021/7/1.
//

import UIKit

class ViewController: UIViewController {
    

    let imageV = UIImageView()
    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = UIColor.gray

        let image = UIImage(named: "grassAddGood")!.withRenderingMode(.alwaysTemplate) /// fail
        let image1 = UIImage(named: "grassAddGood")!        ///success
        let image2 = render(UIImage(named: "grassAddGood")!, .green) ///success
        imageV.image = image
        imageV.tintColor = .red
        imageV.frame = CGRect(x: 100, y: 100, width: 100, height: 100)
        view.addSubview(imageV)

        DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
            self.start()
            DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
                self.end()
            }
        }
        
    }

    func start() {
        if imageV.layer.animation(forKey: "totationAnimation") == nil {
            let animation = CABasicAnimation(keyPath: "transform.rotation.z")
            animation.duration = 0.5;
            animation.repeatCount = MAXFLOAT;
            animation.toValue = .pi * 2.0
            imageV.layer.add(animation, forKey: "rotationAnimation")
        }
        imageV.layer.speed = 1
    }

    func end() {
        guard imageV.layer.speed > 0 else {
            return
        }
        imageV.layer.speed = 0
        imageV.layer.timeOffset = 0
    }
    
    func render(_ image: UIImage, _ tintColor: UIColor) -> UIImage {
        UIGraphicsBeginImageContextWithOptions(image.size, false, image.scale);
        let context = UIGraphicsGetCurrentContext()
        context!.translateBy(x: 0, y: image.size.height)
        context!.scaleBy(x: 1.0, y: -1.0)
        context!.setBlendMode(.normal)
        context!.clip(to: CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height), mask: image.cgImage!)
        tintColor.setFill()
        context?.fill(CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height))
        let newImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        return newImage!
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        /// fail
        /// If an animation is used -withRenderingMode and an image is used after the animation is complete, the view transition will fail
        /// any viewcontroller
        present(Test2ViewController(), animated: true) {
            /// dont perform
            print("hq111")
        }
    }
}