Question

很抱歉，如果之前有人询问过。

我有一个来自MySQL的日期填充Swift中的tableview。我正在将MySQL日期转换为NSDate

static

这会生成正确的日期，但现在我需要将输出更改为更像：

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
let dateString = "\(dateLabelSource)"
if let dateAdded = dateFormatter.dateFromString(dateString)
{
    self.dateLabel.text = "\(dateAdded)"
}

但无法解决如何做到这一点。

感谢任何帮助。

Answer 1

这应该产生你想要的输出。注意：NSDateFormatters是要创建的昂贵对象，因此最好尽可能多地重用单个实例。

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
let dateString = "\(dateLabelSource)"
if let dateAdded = dateFormatter.dateFromString(dateString)
{
    dateFormatter.dateFormat = "EEEE d MMMM yyyy"
    self.dateLabel.text = "\(dateFormatter.stringFromDate(dateAdded))"
}

“数据格式指南”中有一节涉及格式化日期。 Data Formatting Guide

Answer 2

这将有助于

class Feed: UIViewController, UITableViewDelegate, UITableViewDataSource {

@IBOutlet var table: UITableView!

@IBOutlet var feedBar: UINavigationBar!

var titles = [String]()
var messages = [String]()
var usernames  = [String]()
var types = [String]()

override func viewDidLoad() {
    super.viewDidLoad()
    table.dataSource = self
    messages.reverse()
    titles.reverse()
    usernames.reverse()
    types.reverse()
}

func UIColorFromRGB(rgbValue: UInt) -> UIColor {
    return UIColor(
        red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
        green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
        blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
        alpha: CGFloat(1.0)
    )
}


override func viewDidAppear(animated: Bool) {
    println("View appeared")

    self.messages.removeAll(keepCapacity: true)
    self.titles.removeAll(keepCapacity: true)
    self.usernames.removeAll(keepCapacity: true)
    self.types.removeAll(keepCapacity: true)

    var postQuery = PFQuery(className: "Post")

    postQuery.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in

        if let objects = objects {

            for object in objects {

                self.messages.append(object["message"] as! String)

                self.titles.append(object["title"] as! String)

                self.usernames.append(object["username"] as! String)

                self.types.append(object["type"] as! String)

                self.table.reloadData()


            }

        }

    })
}


func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let postCell = tableView.dequeueReusableCellWithIdentifier("feedPost", forIndexPath: indexPath) as! PostCell

    var post = PFObject(className: "Post")

    if messages.isEmpty == false {
        postCell.message.text = messages[indexPath.row]
    }

    if titles.isEmpty == false {
        postCell.postTtitle.text = titles[indexPath.row]
    }

    if usernames.isEmpty == false {
        postCell.posterName.setTitle(usernames[indexPath.row], forState: .Normal)
    }

    if self.types[indexPath.row] == "post1" {
        postCell.sideLeft.backgroundColor = self.UIColorFromRGB(0xFCFFBD)
        postCell.sideRight.backgroundColor = self.UIColorFromRGB(0xFCFFBD)

    } else if self.types[indexPath.row] == "post2" {
        postCell.sideLeft.backgroundColor = self.UIColorFromRGB(0xFFB4AC)
        postCell.sideRight.backgroundColor = self.UIColorFromRGB(0xFFB4AC)

    } else if self.types[indexPath.row] == "post3" {
        postCell.sideLeft.backgroundColor = self.UIColorFromRGB(0xFFD5A4)
        postCell.sideRight.backgroundColor = self.UIColorFromRGB(0xFFD5A4)
    }


    postCell.selectionStyle = .None

    postCell.message.scrollRangeToVisible(NSMakeRange(0, 0))

    return postCell

}

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

}

Answer 3

使用此代码格式化日期：

let dateFmt: NSDateFormatter = NSDateFormatter()
dateFmt.dateFormat = "EEEE d MMMM yyyy"
dateFmt.locale = NSLocale(localeIdentifier: "en_US") // If you consider to not localise date
println(dateFmt.stringFromDate(dateAdded))

将dateFromString转换为另一种格式 - SWIFT

3 个答案: