UIDatePicker to call specific image in UIImageView - swift

Question

Why is "1925-1-23" and "1924-2-5" being excluded when I try to call an image with them in date picker? I am successfully able to call images with every date in between the two dates above. Why are the dates "1925-1-23" and "1924-2-5" the only dates not calling images.
import UIKit
public func ==(lhs: NSDate, rhs: NSDate) -> Bool {
return lhs === rhs || lhs.compare(rhs) == .OrderedAscending
}
public func <(lhs: NSDate, rhs: NSDate) -> Bool {
return lhs.compare(rhs) == .OrderedDescending
}
extension NSDate: Comparable { }
class ViewController: UIViewController {
#IBOutlet weak var displayAnimal: UIImageView!
#IBOutlet weak var dateWheel: UIDatePicker!
#IBAction func goButton(sender: UIDatePicker)
{
let dateStringFormatter = NSDateFormatter()
dateStringFormatter.dateFormat = "yyyy-MM-dd"
dateStringFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
{
let dateStringFormatter = NSDateFormatter()
dateStringFormatter.dateFormat = "yyyy-MM-dd"
dateStringFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
let rabbit1A = dateStringFormatter.dateFromString("1924-2-5")
let rabbit2A = dateStringFormatter.dateFromString("1925-1-23")
if(dateWheel.date.compare(rabbit1A!) == NSComparisonResult.OrderedDescending &&
dateWheel.date.compare(rabbit2A!) == NSComparisonResult.OrderedAscending)
{
// set the image of UIImageView
displayAnimal.image = UIImage(named: "rabbit")
}

Answer 1

In your IBOutlet:
#IBAction func selectDateButton(sender : UIDatePicker) {
// set the date criteria here
if(sender.date.compare(dateA) == NSComparisonResult.OrderedAscending && sender.date.compare(dateB) == NSComparisonResult.OrderedDescending) {
// set the image of UIImageView
displayAnimal.image = UIImage(named: "rabbit")
}
}
where dateA and dateB are the date (in form of NSDate) that falls into the criteria of displaying rabbit image.

Answer 2

A date picker won't talk to an image view. A date picker is a UIControl.
The logic to do what you want belongs in your view controller.
You would set up an IBOutlet to your date picker.
You'd add an OK button to your view controller in IB that linked to an IBAction method.
In that IBAction method you would look at the date property of the picker (using the picker's outlet.) If the date matches one of your magic dates, you'd have code that would load one of your images into an image view that was linked to another IBOutlet in your view controller.
Break it down into baby steps. Hook up the outlets and actions. At first just put a println("In button action") in your IBAction method. Next, fetch the date from the picker and log that in your IBAction.
Next, figure out how to write a switch statement that matches your different dates and prints statements when you match your different dates. That will require a detour into the docs to read about Swift's very powerful switch statement.
Next figure out how to load your different images from your array of names and install them into an image view on your view controller when you click a button. (First set up an Int instance variable imageIndex that starts at 0, and have a button press load an image name from you array of image names, increment the index for next time, and then installs the loaded image into your image view.
Finally, adjust your switch statement so your various magic dates load the desired image into your image view.