如何分解包含选择器的函数？

Posted 2023-02-27

【中文标题】如何分解包含选择器的函数？

【英文标题】：how to factorize a function including a selector?

【发布时间】：2020-09-01 08:07:33

【问题描述】：

我有几个具有相同操作的视图。我试图分解函数，但它没有用。 这是 ViewController 中的部分代码：

class MenuViewController: UIViewController 

    @IBOutlet weak var addButton: FloatingActionButton!
    @IBOutlet weak var viewCALORIES: UIView!
    @IBOutlet weak var viewPROTEINES: UIView!
    @IBOutlet weak var viewLIPIDES: UIView!
    @IBOutlet weak var viewGLUCIDES: UIView!
    
    override func viewDidLoad() 
        super.viewDidLoad()

        // BoingCalories Protéines Lipides Glucides
        let tapCalories = UITapGestureRecognizer(target: self, action: #selector(boingCALORIES(gesture:)))
        viewCALORIES.addGestureRecognizer(tapCalories)
        
        let tapProteines = UITapGestureRecognizer(target: self, action: #selector(boingPROTEINES(gesture:)))
        viewPROTEINES.addGestureRecognizer(tapProteines)
        
        let tapLipides = UITapGestureRecognizer(target: self, action: #selector(boingLIPIDES(gesture:)))
        viewLIPIDES.addGestureRecognizer(tapLipides)
        
        let tapGlucides = UITapGestureRecognizer(target: self, action: #selector(boingGLUCIDES(gesture:)))
        viewGLUCIDES.addGestureRecognizer(tapGlucides)
        
        


    @objc private func boingCALORIES(gesture: UITapGestureRecognizer) 
        viewCALORIES.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
        UIView.animate(withDuration: 0.6, delay: 0, usingSpringWithDamping: 0.3, initialSpringVelocity: 0.4, options: [], animations:  self.viewCALORIES.transform = .identity , completion: nil)
    
    
    @objc private func boingPROTEINES(gesture: UITapGestureRecognizer) 
        viewPROTEINES.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
        UIView.animate(withDuration: 0.6, delay: 0, usingSpringWithDamping: 0.3, initialSpringVelocity: 0.4, options: [], animations:  self.viewPROTEINES.transform = .identity , completion: nil)
    
    
    @objc private func boingLIPIDES(gesture: UITapGestureRecognizer) 
        viewLIPIDES.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
        UIView.animate(withDuration: 0.6, delay: 0, usingSpringWithDamping: 0.3, initialSpringVelocity: 0.4, options: [], animations:  self.viewLIPIDES.transform = .identity , completion: nil)
    
    
    @objc private func boingGLUCIDES(gesture: UITapGestureRecognizer) 
        viewGLUCIDES.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
        UIView.animate(withDuration: 0.6, delay: 0, usingSpringWithDamping: 0.3, initialSpringVelocity: 0.4, options: [], animations:  self.viewGLUCIDES.transform = .identity , completion: nil)
    

我尝试了一些测试，但都失败了。那么我怎么能分解所有这些呢？ 谢谢

【问题讨论】：

您仍然可以将 2 行提取到一个函数中，然后从每个当前函数中使用正确的视图调用它，即使增益没有那么大

您可以从手势中检索视图。这就是您可能缺少的信息。

Larme，我不明白你从手势中检索视图是什么意思。请给我看看好吗？

【参考方案1】：

从UITapGestureRecognizer，您可以检索视图。

let view = gesture.view

所以你可以这样做：

@objc private func boingView(gesture: UITapGestureRecognizer) 
    let view = gesture.view
    view.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
    UIView.animate(withDuration: 0.6, 
                   delay: 0,
                   usingSpringWithDamping: 0.3,
                   initialSpringVelocity: 0.4,
                   options: [],
                    animations:  view.transform = .identity ,
                    completion: nil)

并分解调用：

let action = #selector(boingView(gesture:))

let tapCalories = UITapGestureRecognizer(target: self, action: action)
viewCALORIES.addGestureRecognizer(tapCalories)
        
let tapProteines = UITapGestureRecognizer(target: self, action: action)
viewPROTEINES.addGestureRecognizer(tapProteines)
        
let tapLipides = UITapGestureRecognizer(target: self, action: action)
viewLIPIDES.addGestureRecognizer(tapLipides)
        
let tapGlucides = UITapGestureRecognizer(target: self, action: action)
viewGLUCIDES.addGestureRecognizer(tapGlucides)

如果我们走得更远一点，我们可以将视图放入一个数组并循环它们：

let views = [viewCALORIES, viewPROTEINES, viewLIPIDES, viewGLUCIDES]
let action = #selector(boingView(gesture:))

views.forEach  aView in
    let tap = UITapGestureRecognizer(target: self, action: action)
    aView.addGestureRecognizer(tap)

【讨论】：

哪一部分在viewDidLoad里面，哪一部分在外面？

同样的逻辑：你应用addGesture()的地方，就是viewDidLoad()。另一个boingView，是另一种方法。