Arrays 实例方法&x27；包含'；要求'；UITextField'；符合'；StringProtocol'；_Arrays_Swift_Uialertcontroller

Arrays 实例方法&x27；包含'；要求'；UITextField'；符合'；StringProtocol'；

arrays swift

Arrays 实例方法&x27；包含'；要求'；UITextField'；符合'；StringProtocol'；,arrays,swift,uialertcontroller,Arrays,Swift,Uialertcontroller,我有一个tableview，它显示一个带有名称和类别属性的sourceArray。我想根据用户从UIAlertController输入的内容筛选sourceArray的Category属性，但获取错误“Instance method”contains需要“UITextField”符合“StringProtocol”。非常感谢您的帮助 var sourceArray = [(Name: String, Category: String, Picture1: UIImage, Picture2: U

我有一个tableview，它显示一个带有名称和类别属性的sourceArray。我想根据用户从UIAlertController输入的内容筛选sourceArray的Category属性，但获取错误“Instance method”contains需要“UITextField”符合“StringProtocol”。非常感谢您的帮助

var sourceArray = [(Name: String, Category: String, Picture1: UIImage, Picture2: UIImage, Picture3: UIImage, Description: String)]()

@IBAction func filterButton(_ sender: UIBarButtonItem) {
    var textField = UITextField()
    let alert = UIAlertController(title: "Category", message: nil, preferredStyle: .alert)
    let action = UIAlertAction(title: "Filter", style: .default) { (action) in
        print(textField)
        let filtered = sourceArray.filter({$0.Category.contains(textField)})
        self.filteredArray = filteredArray.isEmpty ? sourceArray : filtered
        self.tableview.reloadData()

    }
    alert.addTextField { (alertTextField) in
        alertTextField.placeholder = "Biceps, Chest, Shoulders, etc."
        textField = alertTextField
    }
    alert.addAction(action)
    present(alert, animated: true, completion: nil)
    
}

我遇到的问题是textField没有被识别为字符串。因此，我添加了一个常量文本作为字符串，并将textField.text这样分配给它

@IBAction func filterButton(_ sender: UIBarButtonItem) {
    var textField = UITextField()
    let alert = UIAlertController(title: "Category", message: nil, preferredStyle: .alert)
    let action = UIAlertAction(title: "Filter", style: .default) { (action) in
        
        let text: String = textField.text!
        let filtered = self.sourceArray.filter({$0.Category.contains(text)})
        self.filteredArray = self.filteredArray.isEmpty ? self.sourceArray : filtered
        self.tableview.reloadData()

    }
    alert.addTextField { (alertTextField) in
        alertTextField.placeholder = "Biceps, Chest, Shoulders, etc."
        textField = alertTextField
    }
    alert.addAction(action)
    present(alert, animated: true, completion: nil)
    
}

我遇到的问题是textField没有被识别为字符串。因此，我添加了一个常量文本作为字符串，并将textField.text这样分配给它

@IBAction func filterButton(_ sender: UIBarButtonItem) {
    var textField = UITextField()
    let alert = UIAlertController(title: "Category", message: nil, preferredStyle: .alert)
    let action = UIAlertAction(title: "Filter", style: .default) { (action) in
        
        let text: String = textField.text!
        let filtered = self.sourceArray.filter({$0.Category.contains(text)})
        self.filteredArray = self.filteredArray.isEmpty ? self.sourceArray : filtered
        self.tableview.reloadData()

    }
    alert.addTextField { (alertTextField) in
        alertTextField.placeholder = "Biceps, Chest, Shoulders, etc."
        textField = alertTextField
    }
    alert.addAction(action)
    present(alert, animated: true, completion: nil)
    
}

什么是

sourceArray

？sourceArray是我用来填充tableView的数组。它包含练习名称及其类别。您的代码毫无意义。您创建了一个新的未连接任何东西的UITextField，然后尝试查看sourceArray是否包含该文本字段对象？代码是否创建了textField并创建了UIAlertAction以从sourceArray中筛选文本字段？这就是我对它的理解，很可能我的逻辑在这里不起作用。我正在尝试根据文本字段中输入的内容过滤sourceArray。有更好的方法吗？什么是

sourceArray