我正在尝试从component year week，dayOfWeek和let calendar = NSCalendar(identifier: NSCalendarIdentifierISO8601)
let components = NSDateComponents()
components.weekday = 1
components.weekOfYear = 16
components.yearForWeekOfYear = 2016
let dateKW = calendar?.dateFromComponents(components)
获取约会，但我从上面得到了奇怪的约会提到的功能。这是我的工作：
weekday变量dateKW等于24。2016年4月。当我将import UIKit
class RestaurantTableViewController: UITableViewController {
var restaurants:[Resturant] = [
Resturant(name: "Hardees", type: "Burger", location: "Many", image: "Hardees.jpg", isVisited: false), Resturant(name: "Shake Shack", type: "Burger", location: "Gulf Mall", image: "shakeshack.jpg", isVisited: false), Resturant(name: "Burgery", type: "Burger", location: "Gulf Mall", image: "shakeshack.jpg", isVisited: false), Resturant(name: "Dairy Queen", type: "Burger", location: "Gulf Mall", image: "shakeshack.jpg", isVisited: false), Resturant(name: "Elevation Burger", type: "Burger", location: "Gulf Mall", image: "shakeshack.jpg", isVisited: false), Resturant(name: "Fat Burger", type: "Burger", location: "Gulf Mall", image: "shakeshack.jpg", isVisited: false)
]
override func viewDidLoad() {
super.viewDidLoad()
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return restaurants.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cellIdentifier = "Cell"
let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as! CustomTableViewCell
// Configure the cell...
cell.nameLabel.text = restaurants[indexPath.row].name
cell.thumbnailImageView.image = UIImage(named: restaurants[indexPath.row].image)
cell.locationLabel.text = restaurants[indexPath.row].location
cell.typeLabel.text = restaurants[indexPath.row].type
cell.accessoryType = restaurants[indexPath.row].isVisited ? .checkmark : .none
return cell
}
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
// Delete the row from the data source
restaurants.remove(at: indexPath.row)
}
tableView.deleteRows(at: [indexPath], with: .fade)
}
override func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
// Social Sharing Button
let shareAction = UITableViewRowAction(style: UITableViewRowActionStyle.default, title: "Share", handler: { (action, indexPath) -> Void in
let defaultText = "Just checking in at " + self.restaurants[indexPath.row].name
if let imageToShare = UIImage(named: self.restaurants[indexPath.row].image) {
let activityController = UIActivityViewController(activityItems: [defaultText, imageToShare], applicationActivities: nil)
self.present(activityController, animated: true, completion: nil)
}
})
// Delete button
let deleteAction = UITableViewRowAction(style: UITableViewRowActionStyle.default, title: "Delete",handler: { (action, indexPath) -> Void in
// Delete the row from the data source
self.restaurants.remove(at: indexPath.row)
self.tableView.deleteRows(at: [indexPath], with: .fade)
})
shareAction.backgroundColor = UIColor(red: 48.0/255.0, green: 173.0/255.0, blue: 99.0/255.0, alpha: 1.0)
deleteAction.backgroundColor = UIColor(red: 202.0/255.0, green: 202.0/255.0, blue: 203.0/255.0, alpha: 1.0)
return [deleteAction, shareAction]
}
// MARK: -
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showRestaurantDetail" {
if let indexPath = tableView.indexPathForSelectedRow {
let destinationController = segue.destination as! ResturantDetailViewController
destinationController.resturant = restaurants[indexPath.row]
}
}
}
}
更改为2时，我得到2016年4月18日。为什么会这样？难道第一天不应该是2016年4月17日吗？
答案 0 :(得分：3)
在公历中，工作日单位从1=Sunday，2=Monday，...到7=Saturday不等。如果您所在区域的第一个工作日是星期一（例如在德国），那么第18个日历周
2016年4月18日（周一）至4月24日（周日）。
因此要求在第16周的星期天
components.weekday = 1
components.weekOfYear = 16
components.yearForWeekOfYear = 2016
正确返回2016年4月24日。如果您需要第一天 一周然后设置
components.weekday = calendar.firstWeekday
或根本不设置components.weekday。