Question

我有一个NSMutableArray数组，如下所示

var myArr = NSMutableArray() {
        studentId = 1437404654;
        name = "Rancho";
    },
            {
        studentId = 1932617669;
        name = "Mastora";
    },
            {
        studentId = 1457367179;
        name = "Amanda";
    }

我再拿一个NSMutableArray进行排序

var copyArr = NSMutableArray()
@IBOutlet weak var resultTable: UITableView!
@IBOutlet weak var searchBar: UISearchBar!
var searchActive : Bool = false

我使用myArr作为行数

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return myArr.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! MyCell

let dict = self. myArr[indexPath.row] as! NSDictionary       
        cell.idTextField.text = (dict.value(forKey: "studentId") as! String)
        cell.nameTextField.text = (dict.value(forKey: "name") as! String)

  return cell    
}

func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
    searchActive = true;
}

func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
    searchActive = false;
}

func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
    searchActive = false;
}

func searchBarSearchButtonClicked(_ searchBar: UISearchBar){
    searchActive = false;
}

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {       
    let predicate = NSPredicate(format: "%K CONTAINS[cd] %@ OR %K CONTAINS[cd] %@", "studentId", searchText, "name", searchText)

    let sorted = copyArr.filter({
        return predicate.evaluate(with: $0)
    })

    print(sorted)

    myArr.removeAllObjects()

    if sorted.count==0
    {
        myArr.addObjects(from: copyArr as! [Any])
    }
    else {
        myArr.addObjects(from: sorted)
    }

    resultTable.reloadData()
}

但是表未排序。请告诉我解决方法

Answer 1

据我了解，您需要对数组进行排序。表格视图就是UI。因此，在为表视图分配值之前，需要对任何数组进行排序。

<PropertyGroup>

您可以使用以下方式对蚂蚁阵列进行排序

Proposed Steps:
1. Get data Assign In Array (Whatever data source)
2. Sort An Array
3. Reload Table View

OR

struct Contact {
  var firstName: String
  var lastName: String
}

var contacts = [
  Contact(firstName: "Leonard", lastName: "Charleson"),
  Contact(firstName: "Michael", lastName: "Webb"),
  Contact(firstName: "Charles", lastName: "Alexson"),
  Contact(firstName: "Michael", lastName: "Elexson"),
  Contact(firstName: "Alex", lastName: "Elexson"),
]

contacts.sort {
  ($0.lastName, $0.firstName) <
    ($1.lastName, $1.firstName)
}

print(contacts)

// [
//   Contact(firstName: "Charles", lastName: "Alexson"),
//   Contact(firstName: "Leonard", lastName: "Charleson"),
//   Contact(firstName: "Alex", lastName: "Elexson"),
//   Contact(firstName: "Michael", lastName: "Elexson"),
//   Contact(firstName: "Michael", lastName: "Webb")
// ]

用于对数组进行排序的公式

var students = ["Kofi", "Abena", "Peter", "Kweku", "Akosua"]
students.sort()
print(students)
// Prints ["Abena", "Akosua", "Kofi", "Kweku", "Peter"]

快乐编码...：）

Answer 2

代码中有很多问题。

首先使用struct

struct Student {
    let name : String
    let id : Int
}

然后声明两个 native 数组（从不使用NSMutable..集合类型），一个数组用于完整的数据集，另一个数组用于过滤的数据

var students = [Student(name:"Rancho", id: 1437404654),
                Student(name:"Mastora", id: 1932617669),
                Student(name:"Amanda", id: 1457367179)]

var filteredStudents = [Student]()

在textDidChange中检查空字符串，过滤数据并相应地设置searchActive。

再一次，与Foundation NSPredicate相比，首选本机筛选器API

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    if searchText.isEmpty {
        searchActive = false
        filteredStudents.removeAll()
    } else {
        filteredStudents = students.filter {$0.name.range(of: searchText, options: [.caseInsensitive, .diacriticInsensitive]) != nil 
                                         || String($0.id).range(of: searchText) != nil }
        searchActive = true
    }
    resultTable.reloadData()
}

过滤后的数组与主数组的顺序相同。

在表格视图中，数据源方法根据searchActive来显示数据

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return searchActive ? filteredStudents.count : students.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! MyCell

    let student = searchActive ? filteredStudents[indexPath.row] : students[indexPath.row]      
    cell.idTextField.text = "\(student.id)"
    cell.nameTextField.text = student.name"

    return cell    
}

如何在表视图中排序NSMutableArray？

2 个答案: