Swift - 我如何获取按钮图像当前色调颜色

Question

我有一个按钮，我在其中设置了这样一个图标:

self.mybutton?.setImage(UIImage(named: "ic_remove_red_eye.png"), for: .normal)

我如何检查此图标的当前色调，并根据它更改色调？

下面是 View Controller 的完整代码，有一个函数刷新，我需要在其中比较色调并更改它

import UIKit

class LoginViewController: ViewController {

    var eye: UIButton?
    @IBOutlet weak var welcome: UILabel!

    @IBOutlet weak var email: UITextField!

    @IBOutlet weak var password: UITextField!

    @IBOutlet weak var loginButton: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()
        self.eye = UIButton(type: .custom)
        self.eye?.setImage(UIImage(named: "ic_remove_red_eye.png"), for: .normal)
        self.eye?.imageEdgeInsets = UIEdgeInsetsMake(0, -16, 0, 10)
        self.eye?.frame = CGRect(x: CGFloat(password.frame.size.width - 25), y: CGFloat(5), width: CGFloat(25), height: CGFloat(25))
        self.eye?.addTarget(self, action: #selector(self.refresh), for: .touchUpInside)
        password.rightView = self.eye
        password.rightViewMode = .always
        email.layer.masksToBounds = true

        email.layer.borderWidth = 1.2
        email.layer.borderColor = UIColor.lightGray.cgColor

        password.layer.masksToBounds = true

        password.layer.borderWidth = 1.2
        password.layer.borderColor = UIColor.lightGray.cgColor

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    @IBAction func login(_ sender: UIButton) {
    }

    @objc func refresh(){
        print("dd")

        if let tintColor = self.eye?.imageView?.tintColor{
            print(tintColor)}else{
            print("tint color not found ")
        }
    }
    /*
     // MARK: - Navigation

     // In a storyboard-based application, you will often want to do a little preparation before navigation
     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
     // Get the new view controller using segue.destinationViewController.
     // Pass the selected object to the new view controller.
     }
     */

}

Answer 1

如果您想检查按钮的色调，根据文档，该属性是类型为 UIColor 的 mybutton.tintColor。如果你真的想获得 UIImage 的主色，你可以使用 https://github.com/jathu/UIImageColors