chenr2

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

This is how you fire an event:

NSNotificationCenter.defaultCenter().postNotificationName("doSomething", object: nil)

Elsewhere, listen for the event like so:

Here's a handy snippet when inspecting the network response.

println("request:: \(request)")
println("response:: \(response)")
println("data:: \(data)") 
println("error:: \(error)")

Requires iOS 8+

Say you want 3 cells per row in portrait, but 4 cells in landscape. First calculate the cell dimensions based on the screen width and a padding of 5.

var cellsPerRow:CGFloat = 3
let cellPadding:CGFloat = 5

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

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

	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
	}

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