小编Jho*_*nny的帖子

我在Java测试中遇到了这个问题,我必须为其分配值a,b因此该表达式的计算结果为true:

(a<=b && b<=a && a!=b)

可悲的是,我不知道答案是什么.

我收到一条错误消息" 从Swift nil解包时意外发现Optional",下面是类.该行发生错误:

(cell.contentView.viewWithTag(1) as UILabel).text = object["firstName"] as? String

我有一个自定义单元类,其中2个UILabels标记为1和2,插座已设置

    import UIKit
    import Foundation

    class dictionaryTableViewController: UIViewController,       UITableViewDelegate, UITableViewDataSource{

    var objects = NSMutableArray()
    var dataArray = [["firstName":"Debasis","lastName":"Das","email":"debasis_das@knowstack.com"],["firstName":"John","lastName":"Doe","email":"jdoe@knowstack.com"],["firstName":"Jane","lastName":"Doe","email":"janedoe@knowstack.com"],["firstName":"Mary","lastName":"Jane","email":"mjane@knowstack.com"]]

    @IBOutlet
    var tableView: UITableView!

    var items: [String] = ["We", "Heart", "Swift"]

    override func viewDidLoad() {
        super.viewDidLoad()
        self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "MyCell")
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }


    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return dataArray.count;//self.items.count;
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        //var cell:UITableViewCell …