void AddDataPointsForChart (DateTime XValue, Double YValue)
{
NSCalendar cal = new NSCalendar (NSCalendarType.Gregorian);
NSDateComponents comp = new NSDateComponents ();
comp.Day = XValue.Day;
comp.Month = XValue.Month;
comp.Year = XValue.Year;
comp.Hour = XValue.Hour;
comp.Minute = XValue.Minute;
comp.Second = XValue.Second;
DataPoints.Add (new SFChartDataPoint ( cal.DateFromComponents(comp), NSObject.FromObject(YValue)));
}
private void AddEarthquakesToList (List<Earthquake> earthquakes)
{
var entity = NSEntityDescription.EntityForName ("Earthquake", managedObjectContext);
var fetchRequest = new NSFetchRequest ();
fetchRequest.Entity = entity;
var date = (NSPropertyDescription)entity.PropertiesByName.ValueForKey (new NSString ("date"));
var location = (NSPropertyDescription)entity.PropertiesByName.ValueForKey (new NSString ("location"));
fetchRequest.PropertiesToFetch = new NSPropertyDescription[] { date, location };
fetchRequest.ResultType = NSFetchRequestResultType.DictionaryResultType;
NSError error;
foreach (var earthquake in earthquakes) {
var arguments = new NSObject[] { earthquake.Location, earthquake.Date };
fetchRequest.Predicate = NSPredicate.FromFormat (@"location = %@ AND date = %@", arguments);
var fetchedItems = NSArray.FromNSObjects (managedObjectContext.ExecuteFetchRequest (fetchRequest, out error));
if (fetchedItems.Count == 0) {
if (string.IsNullOrEmpty (entity.Description))
continue;
var managedEarthquake = new ManagedEarthquake (entity, managedObjectContext) {
Magnitude = earthquake.Magnitude,
Location = earthquake.Location,
Date = earthquake.Date,
USGSWebLink = earthquake.USGSWebLink,
Latitude = earthquake.Latitude,
Longitude = earthquake.Longitude
};
managedObjectContext.InsertObject (managedEarthquake);
}
var gregorian = new NSCalendar (NSCalendarType.Gregorian);
var offsetComponents = new NSDateComponents ();
offsetComponents.Day = -14;// 14 days back from today
NSDate twoWeeksAgo = gregorian.DateByAddingComponents (offsetComponents, NSDate.Now, NSCalendarOptions.None);
// use the same fetchrequest instance but switch back to NSManagedObjectResultType
fetchRequest.ResultType = NSFetchRequestResultType.ManagedObject;
fetchRequest.Predicate = NSPredicate.FromFormat (@"date < %@", new NSObject[] { twoWeeksAgo });
var olderEarthquakes = NSArray.FromObjects (managedObjectContext.ExecuteFetchRequest (fetchRequest, out error));
for (int i = 0; i < olderEarthquakes.Count; i++) {
managedObjectContext.DeleteObject (olderEarthquakes.GetItem<ManagedEarthquake> (i));
}
if (managedObjectContext.HasChanges) {
if (!managedObjectContext.Save (out error))
Console.WriteLine (string.Format ("Unresolved error {0}", error.LocalizedDescription));
}
}
}
