Ios 从另一个视图控制器修改类

我正在使用此代码自定义主ViewController上的UIButtons，并将其放置在它自己单独的.swift文件中，以便在UIButton存在的任何位置引用。按下按钮后，我希望能够从主ViewController中修改MyCustomButton的属性。 例如，我按下一个使用MyCustomButton属性的按钮，它的颜色会发生变化

我刚刚进入swift，还不太熟悉它的来龙去脉。感谢您的帮助

import Foundation
import UIKit

class MyCustomButton: UIButton {

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.layer.cornerRadius = 25;
        self.layer.borderColor = UIColor.blackColor().CGColor
        self.layer.borderWidth = 3
        self.backgroundColor = UIColor.redColor()
        self.tintColor = UIColor.whiteColor()
        self.setTitle("", forState: UIControlState.Normal)
        self.titleLabel?.numberOfLines = 0
        self.titleLabel?.textAlignment = NSTextAlignment.Center
    }
}

---

您可以尝试覆盖layoutSubviews方法：

override func layoutSubviews() {
    super.layoutSubviews()

    if self.state == UIControlState.Highlighted {
        // DO WHAT YOU WANT
    } else {
        // RESET TO NORMAL
    }
}

---

或者（）就行了！这两种方法都允许您在特定操作发生时操作UI元素的属性。

如果您想创建新类并更改按钮默认行为，您应该重写类似于此的函数

override func pressesBegan(presses: Set<UIPress>, withEvent event: UIPressesEvent?) {
    super.pressesBegan(presses, withEvent: event)
    // add your implementation here
}

//    func pressesCancelled
//    func pressesChanged
//    func pressesEnded
//    etc.

检查该问题：

    override func viewDidLoad() {
        super.viewDidLoad()

        let button   = UIButton(type: UIButtonType.System) as UIButton
        button.frame = CGRectMake(100, 100, 100, 100)
        button.setTitle("My Button", forState: UIControlState.Normal)
        button.addTarget(self, action: "someAction:", forControlEvents: UIControlEvents.TouchUpInside)
        self.view.addSubview(button)
    }

    func someAction(sender: UIButton) {
        print("My Button tapped")
        sender.setTitle("Now Tapped", forState: UIControlState.Normal)
    }