Play Music in iOS

Here’s a utility to play background music for iOS in Swift:

First, import AVFoundation. Then add:

var backgroundMusicPlayer: AVAudioPlayer!

func playBackgroundMusic(filename: String) {
    let resourceUrl = Bundle.main.url(forResource: filename, withExtension: nil)
    guard let url = resourceUrl else {
        print("Could not find file: \(filename)")
        return
    }
    
    do {
        try backgroundMusicPlayer = AVAudioPlayer(contentsOf: url)
        backgroundMusicPlayer.numberOfLoops = -1 // endless loop
        backgroundMusicPlayer.prepareToPlay()
        backgroundMusicPlayer.play()
    } catch {
        print("Could not create audio player")
        return
    }
}

Use it like this:

playBackgroundMusic(filename: "backgroundMusic.mp3")

 

Generic Alert Method

Here is a generic alert method that you can place in a global functions/variables file that checks for an existing alert first.

func showAlert(withTitle title: String, message: String, viewController: UIViewController) {
    if viewController.presentedViewController == nil { // Prevent multiple alerts at the same time
        let localizedTitle = NSLocalizedString(title, comment: "")
        let localizedMessage = NSLocalizedString(message, comment: "")
        let alert = UIAlertController(title: localizedTitle, message: localizedMessage, preferredStyle: .Alert)
        let action = UIAlertAction(title: "OK", style: .Default, handler: nil)
        alert.addAction(action)
        
        viewController.presentViewController(alert, animated: true, completion: nil)
    }
}

 

Get Timestamps

This is just a random method I’m no longer using and wanted to get rid of but didn’t really want to throw it away in case I want to reference it someday.

static func getTimestamps(forEntry entry: Entry?) -> [String: Int] {
    let calendar = NSCalendar.currentCalendar()
    let formatter = NSDateFormatter()
    formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
    var since = NSDate()
    var until = NSDate()
    
    if let entry = entry {
        if let createdAt = entry.created_at {
            // get date portion only of createdAt
            let entryDateComponents = calendar.components([.Day, .Month, .Year], fromDate: createdAt)
            
            // set the time to midnight and the last second
            let entryDateBegin = "\(entryDateComponents.year)-\(entryDateComponents.month)-\(entryDateComponents.day) 00:00:00"
            let entryDateEnd = "\(entryDateComponents.year)-\(entryDateComponents.month)-\(entryDateComponents.day) 23:59:59"
            
            since = formatter.dateFromString(entryDateBegin)!
            until = formatter.dateFromString(entryDateEnd)!
        }
    } else {
        let currentDateComponents = calendar.components([.Day, .Month, .Year], fromDate: NSDate())
        let currentDateBegin = "\(currentDateComponents.year)-\(currentDateComponents.month)-\(currentDateComponents.day) 00:00:00"
        let currentDateEnd = "\(currentDateComponents.year)-\(currentDateComponents.month)-\(currentDateComponents.day) 23:59:59"
        
        since = formatter.dateFromString(currentDateBegin)!
        until = formatter.dateFromString(currentDateEnd)!
    }
    
    let sinceTimestamp = Int(since.timeIntervalSince1970)
    let untilTimestamp = Int(until.timeIntervalSince1970)
    
    return ["since": sinceTimestamp, "until": untilTimestamp]
}

 

Add Share Button to iOS 9 App

@IBAction func export(sender: UIBarButtonItem) {        
    if let data = prepareCSVData() {
        let filename = getDocumentsDirectory().stringByAppendingPathComponent("data.csv")
        
        data.writeToFile(filename, atomically: true)
        
        let url = NSURL(fileURLWithPath: filename)
        
        let activityViewController = UIActivityViewController(activityItems: [url], applicationActivities: nil)
        
        if let popoverController = activityViewController.popoverPresentationController {
            popoverController.barButtonItem = sender
        }

        presentViewController(activityViewController, animated: true, completion: nil)

    } else {
        NSLog("Unable to prepare data")
    }
}

The important line is where you set up the popoverController. Without that, it will crash on iPad.