Refined API Naming : Migrating to Swift 3!

Xcode 8.0 comes with a Swift Migrator tool that helps you migrate your project to Swift 3, or update it to work with Swift 2.3 and the new SDKs.

Swift Migration Assistant

When you open your project with Xcode 8.0 for the first time, you will be prompted via the migration assistant to do a migration pass. The assistant can also be invoked manually from the menu Edit -> Convert -> To Current Swift Syntax…
You can choose from two kinds of migration to perform:

Use Swift 2.3 Modifies your project to enable the Use Legacy Swift build setting and provides source changes to be able to build against the new SDKs.

Use Swift 3 This is recommended. You will get source changes to be able to build your project using Swift 3 and take advantage of all the new features in Xcode 8.0.

Optionally, you can move to Swift 2.3 now and invoke the migration assistant again later to update to Swift 3.

Refined API Naming in Swift 3

I found following changes when I was migrating my code to Swift 2.2 to Swift 3.

Instantiate ViewController With Identifier

//Swift 2.2
        let aController = self.storyboard.instantiateViewControllerWithIdentifier("identifier")
//Swift 3
        let aController = self.storyboard.instantiateViewController(withIdentifier: "identifier")

//Swift 2.2

let aController = self.storyboard.instantiateViewControllerWithIdentifier("identifier")

//Swift 3

let aController = self.storyboard.instantiateViewController(withIdentifier: "identifier")

User Defaults

//Swift 2.2
        let userDefaults = NSUserDefaults.standardUserDefaults()
        if let isYourValue = userDefaults.objectForKey("key") {
        }
        else {
            userDefaults.setBool(false, forKey: "key")
            userDefaults.synchronize()
        }
//Swift 3
        let userDefaults = UserDefaults.standard
        if let isYourValue = userDefaults.object(forKey: "key") {
        }
        else {
            userDefaults.set(false, forKey: "key")
            userDefaults.synchronize()
        }

//Swift 2.2

let userDefaults = NSUserDefaults.standardUserDefaults()

if let isYourValue = userDefaults.objectForKey("key") {

}

else {

userDefaults.setBool(false, forKey: "key")

userDefaults.synchronize()

}

//Swift 3

let userDefaults = UserDefaults.standard

if let isYourValue = userDefaults.object(forKey: "key") {

}

else {

userDefaults.set(false, forKey: "key")

userDefaults.synchronize()

}

Open URL

//Swift 2.2
	UIApplication.sharedApplication().openURL(NSURL(string: "tel://919714494770")!)
//Swift 3
	UIApplication.shared.openURL(URL(string: "tel://919714494770")!)

//Swift 2.2

UIApplication.sharedApplication().openURL(NSURL(string: "tel://919714494770")!)

//Swift 3

UIApplication.shared.openURL(URL(string: "tel://919714494770")!)

Perform Segue with Identifier

Swift

//Swift 2.2 performSegueWithIdentifier("toView", sender: nil) //Swift 3 performSegue(withIdentifier: "toView", sender: nil)

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//Swift 2.2
performSegueWithIdentifier("toView", sender: nil)
//Swift 3
performSegue(withIdentifier: "toView", sender: nil)
Dequeue Reusable Cell With Identifier

Swift

//Swift 2.2 let cell = tableView.dequeueReusableCellWithIdentifier("Cell")! //Swift 3 let cell = tableView.dequeueReusableCell(withIdentifier: "Cell")!

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//Swift 2.2
let cell = tableView.dequeueReusableCellWithIdentifier("Cell")!
//Swift 3
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell")!

Cell for row at IndexPath

//Swift 2.2
	func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
//Swift 3
	func tableView(_ tableView: UITableView, cellForRowAtIndexPath indexPath: IndexPath) -> UITableViewCell {

//Swift 2.2

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

//Swift 3

func tableView(_ tableView: UITableView, cellForRowAtIndexPath indexPath: IndexPath) -> UITableViewCell {

UIApplication Shared Application

Swift

//Swift 2.2 UIApplication.sharedApplication().keyWindow! //Swift 3 UIApplication.shared.keyWindow!

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//Swift 2.2
UIApplication.sharedApplication().keyWindow!
//Swift 3
UIApplication.shared.keyWindow!
String Encoding Unicode

Swift

//Swift 2.2 NSUnicodeStringEncoding //Swift 3 String.Encoding.unicode

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//Swift 2.2
NSUnicodeStringEncoding
//Swift 3
String.Encoding.unicode
String Encoding UTF8

Swift

//Swift 2.2 NSUTF8StringEncoding //Swift 3 String.Encoding.utf8

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//Swift 2.2
NSUTF8StringEncoding
//Swift 3
String.Encoding.utf8
UIButton set title with state

Swift

//Swift 2.2 UIButton -> setAttributedTitle(str, forState: self.state) //Swift 3 UIButton -> setAttributedTitle(str, for: self.state)

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//Swift 2.2
UIButton -> setAttributedTitle(str, forState: self.state)
//Swift 3
UIButton -> setAttributedTitle(str, for: self.state)

CGSize

//Swift 2.2
	let size = CGSizeMake(CGRectGetWidth(self.bounds), CGFloat(MAXFLOAT))
//Swift 3
	let size = CGSize(width: self.bounds.width, height: CGFloat(MAXFLOAT))

//Swift 2.2

let size = CGSizeMake(CGRectGetWidth(self.bounds), CGFloat(MAXFLOAT))

//Swift 3

let size = CGSize(width: self.bounds.width, height: CGFloat(MAXFLOAT))

CGPoint

Swift

//Swift 2.2 CGPointMake(0, 50) //Swift 3 CGPoint(x: 0, y: 50)

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//Swift 2.2
CGPointMake(0, 50)
//Swift 3
CGPoint(x: 0, y: 50)

Matches in NSRegularExpression

//Swift 2.2
	let regEx = try NSRegularExpression(pattern: text, options: [])
	ranges = regex.matchesInString(self.string, options: [], range: NSMakeRange(0, self.string.characters.count)).map {$0.range}
//Swift 3
	let regEx = try NSRegularExpression(pattern: text, options: [])
	ranges = regex.matches(in: self.string, options: [], range: NSMakeRange(0, self.string.characters.count)).map {$0.range}

//Swift 2.2

let regEx = try NSRegularExpression(pattern: text, options: [])

ranges = regex.matchesInString(self.string, options: [], range: NSMakeRange(0, self.string.characters.count)).map {$0.range}

//Swift 3

let regEx = try NSRegularExpression(pattern: text, options: [])

ranges = regex.matches(in: self.string, options: [], range: NSMakeRange(0, self.string.characters.count)).map {$0.range}

Pop to root view controller

Swift

//Swift 2.2 navigationController.popToRootViewControllerAnimated(true) //Swift 3 navigationController.popToRootViewController(animated: true)

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//Swift 2.2
navigationController.popToRootViewControllerAnimated(true)
//Swift 3
navigationController.popToRootViewController(animated: true)
Hide and show any control

Swift

//Swift 2.2 self.viewSample.hidden = true //Swift 3 self.viewSample.isHidden = true

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//Swift 2.2
self.viewSample.hidden = true
//Swift 3
self.viewSample.isHidden = true

NSTimer to Timer

//Swift 2.2
	var timer : NSTimer!
	timer = NSTimer.scheduledTimerWithTimeInterval(Double(1.0), target: self, selector: #selector(self.yourMethod), userInfo: nil, repeats: true)
//Swift 3
	var timer : Timer!
	timer = Timer.scheduledTimer(timeInterval: Double(1.0), target: self, selector: #selector(self.yourMethod), userInfo: nil, repeats: true)

//Swift 2.2

var timer : NSTimer!

timer = NSTimer.scheduledTimerWithTimeInterval(Double(1.0), target: self, selector: #selector(self.yourMethod), userInfo: nil, repeats: true)

//Swift 3

var timer : Timer!

timer = Timer.scheduledTimer(timeInterval: Double(1.0), target: self, selector: #selector(self.yourMethod), userInfo: nil, repeats: true)

CGPointZero

Swift

//Swift 2.2 CGPointZero //Swift 3 CGPoint.zero

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//Swift 2.2
CGPointZero
//Swift 3
CGPoint.zero

Prepare for Segue

//Swift 2.2
	override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
	}
//Swift 3
	override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
	}

//Swift 2.2

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

}

//Swift 3

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

}

Dispatch Queue

Swift

//Swift 2.2 dispatch_async(dispatch_get_main_queue()) { } //Swift 3 DispatchQueue.main.async { }

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//Swift 2.2
dispatch_async(dispatch_get_main_queue()) {
}
//Swift 3
DispatchQueue.main.async {
}
UIColor & CGColor

Swift

//Swift 2.2 UIColor.blackColor().CGColor //Swift 3 UIColor.black.cgColor

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//Swift 2.2
UIColor.blackColor().CGColor
//Swift 3
UIColor.black.cgColor
CGSize

Swift

//Swift 2.2 CGSizeMake(0, 5) //Swift 3 CGSize(width: 0, height: 5)

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//Swift 2.2
CGSizeMake(0, 5)
//Swift 3
CGSize(width: 0, height: 5)
Select and deselect any control

Swift

//Swift 2.2 UIButton.selected //Swift 3 UIButton.isSelected

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//Swift 2.2
UIButton.selected
//Swift 3
UIButton.isSelected

And more…

Happy Coding 🙂

Refined API Naming in Swift 3

And more…

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