NSArray 转换为 Swift 数组后数组为空

Question

我最近在玩Swift。我正在使用自定义 TableView 执行搜索功能。我已经关注人以使我的搜索工作完美，但我在从 NSArray 到 Swift 数组的转换时遇到问题。

这是我的代码。

func updateSearchResultsForSearchController(searchController: UISearchController) {
    filtered.removeAll(keepCapacity: false)
    proccessArray.removeAll(keepCapacity: false)
    print("start")
    var array = []
    for i in 0...arrProcessName.count{
        if(arrProcessName[safe: i] != nil && arrRequestedBy[safe: i] != nil && arrCreationTime[safe: i] != nil && arrStatus[safe: i] != nil)
        {
            var newProcess = Process(process: arrProcessName[i], requestor: arrRequestedBy[i], time: arrCreationTime[i], status: arrStatus[i])
            self.proccessArray.append(newProcess)
        }
    }
    print("array: ", proccessArray)
    let searchPredicate = NSPredicate(format: "status CONTAINS[c] %@", "pending")
    array = (proccessArray as NSArray).filteredArrayUsingPredicate(searchPredicate)
    print("array: ", array)
    let arr2 = (array as Array).map { [=11=] as? String ?? "" }
    filtered = arr2
    print("filtered: ", filtered)

    if(filtered.count == 0){
                    searchActive = false;
                } else {
                    searchActive = true;
                }
    tableView?.reloadData()
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    removeProgressBar()
    let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! HistoryCustomCell

    cell.selectionStyle = .None
    cell.accessoryType = UITableViewCellAccessoryType.None

    if self.searchCtrler.active {
        print("processArray: ",proccessArray[indexPath.row].status as String!)
        cell.lbl_status.text = proccessArray[indexPath.row].status as String!
    } else {
        cell.lbl_request_name.text = arrProcessName[indexPath.row]
        cell.lbl_requested_by.text = "Requested by: " + arrRequestedBy[indexPath.row]
        cell.lbl_creation_time.text = arrCreationTime[indexPath.row]
        cell.lbl_status.text = arrStatus[indexPath.row]

        switch arrStatus[indexPath.row] {
            case "Completed", "Approved":
                cell.img_status.image = UIImage(named: "ic_approved")
            case "Running", "Processing", "Pending":
                cell.img_status.image = UIImage(named: "ic_pending")
            case "Denied", "Rejected":
                cell.img_status.image = UIImage(named: "ic_reject")
            case "Error":
                cell.img_status.image = UIImage(named: "ic_terminated")
            case "Retracted":
                cell.img_status.image = UIImage(named: "ic_retracted")
            default:
                cell.img_status.image = UIImage(named: "")
        }
    }

    return cell
}

Class 进程

import Foundation

class Process:NSObject{
var process: NSString!
var requestor: NSString!
var time: NSString!
var status: NSString!

init(process:NSString, requestor:NSString, time: NSString, status: NSString){
    self.process = process
    self.requestor = requestor
    self.time = time
    self.status = status
}

}

我把数组打印出来了，结果是这样的

array:  (
   "< X.Process: 0x7f8bc94cfa50>"
)

过滤后的转换。我得到一个空数组，它击中了我 EXC_BAD_INSTRUCTION.

有没有办法将我的 NSArray 转换为 Swift 数组而不影响我在 NSArray 中的数据？

谢谢

Answer 1

不需要将Swift数组[Process]转换为NSArray只是为了过滤，你可以像这样直接过滤你的[Process]数组。

let filterProcess = self.proccessArray.filter { [=10=].status == "pending" }

在你的情况下没有必要使用 contains 但如果你想那么：

let filterProcess = self.proccessArray.filter { [=11=].status.localizedCaseInsensitiveContainsString("pending") }

NSArray 转换为 Swift 数组后数组为空

Array is empty after the conversion of NSArray to Swift Array

arrays

nspredicate

ios

swift