将字典数组传递给另一个方法时的访问方法

如何解决将字典数组传递给另一个方法时的访问方法

在下面的 swift 代码中，我想创建一个访问方法，该方法在字典项上进行传输，在这种情况下，该字典称为 Girlsname。该项目应该从视图 did load func 转移到名为 submit 的 func。我不知道我现在是否正确设置了提交参数列表，导致编译错误。

import UIKit

class ViewController: UIViewController {
    
    
    var girlsName = ["a": "Jessica Biel","b": "Gwen Stefani","c":"Jessica Alba" ]
    
    var btn = UIButton()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        [btn].forEach{
            $0.translatesAutoresizingMaskIntoConstraints = false
            view.addSubview($0)
            $0.backgroundColor = UIColor(
                red: .random(in: 0.0...1),green: .random(in: 0.9...1),blue: .random(in: 0.7...1),alpha: 1
            )
            
        }
        btn.frame = CGRect(x: 100,y: 100,width: 100,height: 100)
        btn.addTarget(self,action: #selector(submite(randomVal:)),for: .touchDown)
        let index: Int = Int(arc4random_uniform(UInt32(girlsName.count)))
        let randomVal = Array(girlsName.values)[index]
        
        submite(randomVal:randomVal)
    }
    

    @objc func submite(randomVal: String) {
        
        print(String())
    }
    }

解决方法

您不应该尝试将参数传递给@objc func。你可以这样使用

class ViewController: UIViewController {
    var randomVal: String = ""
    // ...
    override func viewDidLoad() {
        super.viewDidLoad()
         // ...
                
         btn.addTarget(self,action: #selector(submite),for: .touchDown)
         let index: Int = Int(arc4random_uniform(UInt32(girlsName.count)))
         randomVal = Array(girlsName.values)[index]
      }
            
      @objc func submit() {
          print(randomVal)
      }
}