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tabBarController?.tabBar.selectedImageTintColor = .redColor()

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func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView!{
    // user location
    if annotation is MKUserLocation {
        (annotation as! MKUserLocation).title = ""
        // use blue pulsy instead of pin
        return nil
    }
    // other pins
    return mapView.dequeueReusableAnnotationViewWithIdentifier("pin") as? MKPinAnnotationView
}

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dispatch_async(dispatch_get_main_queue()) {
    self.someMethod(self.someProperty)
}

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Using UIAlertView

UIAlertView is deprecated, so use it for iOS 7 compatibility. Otherwise, use UIAlertController.

let alertView = UIAlertView()
alertView.message = "here"
alertView.addButtonWithTitle("Ok")
alertView.show()

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Watch all the Swift videos

Resources and links

• WWDC App (has videos for past and present)
• Swift Summit London 2015
• Alt Conf 2015
• Ray Wenderlich training Videos (monthly subscription)

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How to stringify JSON

This assumes you have SwiftyJSON.

Start with a Dictionary

let paramsDictionary = [
    "title": "foo",
 "description": "bar"

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How to make a thread-safe singleton

See http://krakendev.io/blog/the-right-way-to-write-a-singleton

This creates a new User if necessary, or uses the existing one.

class User {
    static let sharedInstance = User()
 var name = "Bruce"

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How to tell if two things are the same

You want to iterate over an array of custom objects, and need to tell whether two objects are equal. You're not concerned with two objects being identical in memory, but equivalent based on your own definition.

class Student {
    var studentId = 0
    var firstName = "Bob"
}

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How to count characters in a string

Just use count

count(textView.text!)

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Error when performing segue on viewDidLoad

Getting this error message:

Presenting view controllers on detached view controllers is discouraged

This is happening because you’re not supposed to perform a segue until viewDidAppear