Question

初学者在这里有一个初学者的问题：

我的视图控制器中有3个分段控件，并且我有3个几乎相同的功能来设置它们的颜色/样式/动画。我知道我不应该重复代码，但是我不确定如何组合这些代码。这可能是显而易见的事情，但我需要看到它完成后才能在应用程序的其他部分完成它。有人可以告诉我这个例子：

class Example: UIViewController {

  @IBOutlet weak var segmentedControl: UISegmentedControl!
    @IBOutlet weak var textSegmentedControl: UISegmentedControl!
    @IBOutlet weak var translationSegmentedControl: UISegmentedControl!

override func viewDidLoad() {
        super.viewDidLoad()

        setMainSegmentedControlStyle()
        setTextSegmentedControlStyle()
        setTranslationSegmentedControlStyle()
}


func setTextSegmentedControlStyle() {
        textSegmentedControl.backgroundColor = .clear
        textSegmentedControl.tintColor = .clear
        textSegmentedControl.setTitleTextAttributes([NSAttributedStringKey.font : UIFont.systemFont(ofSize: 16), NSAttributedStringKey.foregroundColor: UIColor.lightGray
            ], for: .normal)
        textSegmentedControl.setTitleTextAttributes([NSAttributedStringKey.font : UIFont.systemFont(ofSize: 16),
            NSAttributedStringKey.foregroundColor: UIColor.darkGray
            ], for: .selected)
    let textSegmentedUnderline = UIView()

        textSegmentedUnderline.translatesAutoresizingMaskIntoConstraints = false // false since we are using auto layout constraints
        textSegmentedUnderline.backgroundColor = #colorLiteral(red: 0.992502749, green: 0.532302916, blue: 0.08773707598, alpha: 1)
        view.addSubview(textSegmentedUnderline)
        textSegmentedUnderline.topAnchor.constraint(equalTo: textSegmentedControl.bottomAnchor).isActive = true
        textSegmentedUnderline.heightAnchor.constraint(equalToConstant: 3).isActive = true
        textSegmentedUnderline.leftAnchor.constraint(equalTo: textSegmentedControl.leftAnchor).isActive = true
        textSegmentedUnderline.widthAnchor.constraint(equalTo: textSegmentedControl.widthAnchor, multiplier: 1 / CGFloat(textSegmentedControl.numberOfSegments)).isActive = true
        UIView.animate(withDuration: 0.3) {
            self.textSegmentedUnderline.frame.origin.x = (self.textSegmentedControl.frame.width / CGFloat(self.textSegmentedControl.numberOfSegments)) * CGFloat(self.textSegmentedControl.selectedSegmentIndex)
        }
    }

    func setTranslationSegmentedControlStyle() {
        translationSegmentedControl.backgroundColor = .clear
        translationSegmentedControl.tintColor = .clear
        translationSegmentedControl.setTitleTextAttributes([NSAttributedStringKey.font : UIFont.systemFont(ofSize: 16), NSAttributedStringKey.foregroundColor: UIColor.lightGray
            ], for: .normal)
        translationSegmentedControl.setTitleTextAttributes([NSAttributedStringKey.font : UIFont.systemFont(ofSize: 16), NSAttributedStringKey.foregroundColor: UIColor.darkGray
            ], for: .selected)
    let translationSegmentedUnderline = UIView()
       translationSegmentedUnderline.translatesAutoresizingMaskIntoConstraints = false // false since we are using auto layout constraints
        translationSegmentedUnderline.backgroundColor = #colorLiteral(red: 0.992502749, green: 0.532302916, blue: 0.08773707598, alpha: 1)
        view.addSubview(translationSegmentedUnderline)
        translationSegmentedUnderline.topAnchor.constraint(equalTo: textSegmentedControl.bottomAnchor).isActive = true
        translationSegmentedUnderline.heightAnchor.constraint(equalToConstant: 3).isActive = true
        translationSegmentedUnderline.leftAnchor.constraint(equalTo: translationSegmentedControl.leftAnchor).isActive = true
        translationSegmentedUnderline.widthAnchor.constraint(equalTo: translationSegmentedControl.widthAnchor, multiplier: 1 / CGFloat(translationSegmentedControl.numberOfSegments)).isActive = true
        UIView.animate(withDuration: 0.3) {
            self.translationSegmentedUnderline.frame.origin.x = (self.textSegmentedControl.frame.width / CGFloat(self.translationSegmentedControl.numberOfSegments)) * CGFloat(self.translationSegmentedControl.selectedSegmentIndex)
        }
    }

    func setMainSegmentedControlStyle() {
        segmentedControl.backgroundColor = .clear
        segmentedControl.tintColor = .clear
        segmentedControl.setTitleTextAttributes([NSAttributedStringKey.font : UIFont.systemFont(ofSize: 16), NSAttributedStringKey.foregroundColor: UIColor.lightGray
            ], for: .normal)
        segmentedControl.setTitleTextAttributes([NSAttributedStringKey.font : UIFont.systemFont(ofSize: 16),
                                                 NSAttributedStringKey.foregroundColor: UIColor.darkGray
            ], for: .selected)
        let buttonBar = UIView()
        buttonBar.translatesAutoresizingMaskIntoConstraints = false // false since we are using auto layout constraints
        buttonBar.backgroundColor = #colorLiteral(red: 0.992502749, green: 0.532302916, blue: 0.08773707598, alpha: 1)
        view.addSubview(buttonBar)
        buttonBar.topAnchor.constraint(equalTo: segmentedControl.bottomAnchor).isActive = true
        buttonBar.heightAnchor.constraint(equalToConstant: 3).isActive = true
        buttonBar.leftAnchor.constraint(equalTo: segmentedControl.leftAnchor).isActive = true
        buttonBar.widthAnchor.constraint(equalTo: segmentedControl.widthAnchor, multiplier: 1 / CGFloat(segmentedControl.numberOfSegments)).isActive = true
        UIView.animate(withDuration: 0.3) {
            self.buttonBar.frame.origin.x = (self.segmentedControl.frame.width / CGFloat(self.segmentedControl.numberOfSegments)) * CGFloat(self.segmentedControl.selectedSegmentIndex)
        }
    }

}

Answer 1

如果所有样式代码都完全相同，则可以声明一个接受控件作为参数的函数：

func style(control: UISegmentedControl) {
    control.backgroundColor = .clear
    // continue styling here
}

然后只需多次调用该函数，即可传入每个控件：

style(control: segmentedControl)
style(control: textSegmentedControl)
style(control: translationSegmentedControl)

不过请注意，您应该在情节提要中设置尽可能多的设置（例如backgroundColor），而不是代码。

如何结合仅对分段控件样式设置样式的重复代码？

1 个答案: