Created
July 7, 2016 06:42
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Sorting a UITableView by a NSDate object with headers in Swift
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extension NSDate{ | |
convenience | |
init(inputDate: NSDate){ | |
let calendar = NSCalendar.currentCalendar() | |
let timeZone = NSTimeZone.systemTimeZone() | |
calendar.timeZone = timeZone | |
let comps = calendar.components([NSCalendarUnit.Year, NSCalendarUnit.Month, NSCalendarUnit.Day ], fromDate: inputDate) | |
comps.hour = 0 | |
comps.minute = 0 | |
comps.second = 0 | |
let returnDate = calendar.dateFromComponents(comps) | |
self.init(timeInterval:0, sinceDate:returnDate!) | |
} | |
} | |
class SortedTableView: UITableViewController { | |
var sortedArray: Array<AnyObject>? | |
var sections: NSMutableDictionary? | |
var mealArray: NSMutableArray? | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
mealArray = NSMutableArray() | |
mealArray?.addObject(["meal": "banana", "date": NSDate()]) | |
for object in mealArray! { | |
let dict = object as! NSMutableDictionary | |
if let exists = dict["date"] { | |
let date = NSDate(inputDate: exists as! NSDate) | |
var eventsOnThisDay = sections?.objectForKey(date) | |
if eventsOnThisDay == nil { | |
eventsOnThisDay = NSMutableArray() | |
sections?.setObject(eventsOnThisDay!, forKey: date) | |
} | |
eventsOnThisDay!.addObject(dict) | |
let unsorted = sections?.allKeys | |
self.sortedArray = unsorted!.sort({ $0.date.compare($1.date) == .OrderedAscending }) | |
} else { | |
} | |
} | |
} | |
override func numberOfSectionsInTableView(tableView: UITableView) -> Int { | |
if mealArray?.count == 0 || mealArray == nil { | |
let label = UILabel.init(frame: self.view.frame) | |
label.textColor = UIColor.whiteColor() | |
label.text = "No meals" | |
label.tag = 6 | |
self.tableView.separatorStyle = .None | |
label.textAlignment = .Center | |
self.tableView.backgroundView = label | |
return (self.sections?.count)! | |
} | |
self.tableView.separatorStyle = .SingleLine | |
self.tableView.backgroundView = nil | |
return 1 | |
} | |
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { | |
if(mealArray == nil){ | |
return 0 | |
}else{ | |
let date = self.sortedArray![section] as! NSDate | |
let events = self.sections?.objectForKey(date) | |
return (events?.count)! | |
} | |
} | |
override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? { | |
let formatter = NSDateFormatter.init() | |
formatter.timeStyle = .NoStyle | |
formatter.dateStyle = .MediumStyle | |
return formatter.stringFromDate(self.sortedArray![section] as! NSDate) | |
} | |
} |
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