Where to place the general utility functions in iOS 8 + Swift

Question

I have the following method (for example) that I would like to use from any ViewController in an iOS + Swift project:

func initializeBlurEffectOnGivenUIView(UIViewToBeBlurred: UIView) { let UIViewToBeBlurredHeight = UIViewToBeBlurred.frame.size.height let UIViewToBeBlurredWidth = UIViewToBeBlurred.frame.size.width let UIViewToBeBlurredX = UIViewToBeBlurred.frame.origin.x let UIViewToBeBlurredY = UIViewToBeBlurred.frame.origin.y let blurEffect:UIBlurEffect = UIBlurEffect(style: UIBlurEffectStyle.Light) let vibrancyEffect = UIVibrancyEffect(forBlurEffect: blurEffect) let vibrancyEffectView = UIVisualEffectView(effect: vibrancyEffect) let blurEffectView:UIVisualEffectView = UIVisualEffectView(effect: blurEffect) blurEffectView.frame = CGRectMake(UIViewToBeBlurredX, UIViewToBeBlurredY, UIViewToBeBlurredWidth, UIViewToBeBlurredHeight) blurEffectView.contentView.addSubview(vibrancyEffectView) UIViewToBeBlurred.addSubview(blurEffectView) } 

I have more common helpers, such as there, that I would like to make available. How to structure the application to achieve this?

Answer 1

Use an extension, for example:

 extension UIView { func initializeBlurEffect() { let height = self.frame.size.height let width = self.frame.size.width let x = self.frame.origin.x let y = self.frame.origin.y let blurEffect:UIBlurEffect = UIBlurEffect(style: UIBlurEffectStyle.Light) let vibrancyEffect = UIVibrancyEffect(forBlurEffect: blurEffect) let vibrancyEffectView = UIVisualEffectView(effect: vibrancyEffect) let blurEffectView:UIVisualEffectView = UIVisualEffectView(effect: blurEffect) blurEffectView.frame = CGRectMake(x, y, width, height) blurEffectView.contentView.addSubview(vibrancyEffectView) self.addSubview(blurEffectView) } } 

Then name it like this:

 myview.initializeBlurEffect() 

Answer 2

If the function should be free global, put the function at the top level of any file. (Just do not accidentally repeat yourself and put the same function on the top level of all files.) This, for example, is what I do with the delay utility, which I describe here: dispatch_after - GCD in fast?

In the specific case of the example you gave, I would probably put it in an extension on a UIView. I would rewrite it as an instance method, so that instead of blurring another view, we would start with the existing view and blur self .

Answer 3

If you want to access these functions globally, you can put it on top of any file or systematically create a regular quick file and add it there.

OR If you want to access it in UIViews or viewcontroller, you can create a uiview extension (as suggested by @Mike)

Answer 4

You can create a generic class for this, as shown below:

 class Utils { //MARK:- STRING FROM DICT func getStringFromDictionary(dict:Any) -> String{ var strJson = "" do { let data = try JSONSerialization.data(withJSONObject: dict, options: JSONSerialization.WritingOptions.prettyPrinted) strJson = String(data: data, encoding: String.Encoding.utf8)! } catch let error as NSError { print("json error: \(error.localizedDescription)") } return strJson } //MARK:- ALERT func showAlertWithTitleFromVC(vc:UIViewController, title:String, andMessage message:String, buttons:[String], completion:((_ index:Int) -> Void)!) -> Void { let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert) for index in 0..<buttons.count { // alertController.setValue(NSAttributedString(string: title, attributes: [NSFontAttributeName : UIFont.appFont_OpenSans_Regular(fontSize: 15),NSForegroundColorAttributeName : BLACK_COLOR]), forKey: "attributedTitle") // // alertController.setValue(NSAttributedString(string: message, attributes: [NSFontAttributeName : UIFont.appFont_OpenSans_Regular(fontSize: 13),NSForegroundColorAttributeName : APP_COLOR_BLUE_1]), forKey: "attributedMessage") let action = UIAlertAction(title: buttons[index], style: .default, handler: { (alert: UIAlertAction!) in if(completion != nil){ completion(index) } }) // action.setValue(APP_COLOR_BLUE_2, forKey: "titleTextColor") alertController.addAction(action) } vc.present(alertController, animated: true, completion: nil) } //MARK:- ACTION SHEET func showActionSheetWithTitleFromVC(vc:UIViewController, title:String, andMessage message:String, buttons:[String],canCancel:Bool, completion:((_ index:Int) -> Void)!) -> Void { let alertController = UIAlertController(title: title, message: message, preferredStyle: .actionSheet) alertController.setValue(NSAttributedString(string: title, attributes: [NSFontAttributeName : UIFont.appFont_OpenSans_Regular(fontSize: 15),NSForegroundColorAttributeName : BLACK_COLOR]), forKey: "attributedTitle") alertController.setValue(NSAttributedString(string: message, attributes: [NSFontAttributeName : UIFont.appFont_OpenSans_Regular(fontSize: 13),NSForegroundColorAttributeName : APP_COLOR_BLUE_1]), forKey: "attributedMessage") for index in 0..<buttons.count { let action = UIAlertAction(title: buttons[index], style: .default, handler: { (alert: UIAlertAction!) in if(completion != nil){ completion(index) } }) action.setValue(APP_COLOR_BLUE_2, forKey: "titleTextColor") alertController.addAction(action) } if(canCancel){ let action = UIAlertAction(title: "Cancel", style: .cancel, handler: { (alert: UIAlertAction!) in if(completion != nil){ completion(buttons.count) } }) action.setValue(APP_COLOR_BLUE_2, forKey: "titleTextColor") alertController.addAction(action) } vc.present(alertController, animated: true, completion: nil) } //MARK:- INTERNET CHECK func IS_INTERNET_AVAILABLE() -> Bool{ return AIReachabilityManager.shared.isInternetAvailableForAllNetworks() } let INTERNET_MESSAGE:String = "Oops! It seems that you're not connected to the Internet, connect and try again"//"No internet connection, Please try later" func SHOW_INTERNET_ALERT(){ showAlertWithTitleFromVC(vc: (appDelegate.window?.rootViewController)!, title: APP_NAME, andMessage: INTERNET_MESSAGE, buttons: ["Dismiss"]) { (index) in } } //MARK:- CUSTOM LOADER func SHOW_CUSTOM_LOADER(){ SHOW_CUSTOM_LOADER_WITH_TEXT(text: "") } func SHOW_CUSTOM_LOADER_WITH_TEXT(text:String){ SVProgressHUD.setDefaultStyle(.custom) SVProgressHUD.setDefaultMaskType(.custom) SVProgressHUD.setDefaultAnimationType(.flat) SVProgressHUD.setBackgroundColor(UIColor.clear) SVProgressHUD.setRingRadius(30) SVProgressHUD.setRingThickness(5) SVProgressHUD.setForegroundColor(WHITE_COLOR) if(text.characters.count > 0){ SVProgressHUD.show(withStatus: text) }else{ SVProgressHUD.show() } } func HIDE_CUSTOM_LOADER(){ SVProgressHUD.dismiss() } //MARK:- USER DEFAULTS func setUserDefaultsFor(object:AnyObject, with key:String) { UserDefaults.standard.set(object, forKey: key) UserDefaults.standard.synchronize() } func getUserDefaultsForKey(key:String) -> AnyObject? { return UserDefaults.standard.object(forKey: key) as AnyObject? } func removeUserDefaultsFor(key:String) { UserDefaults.standard.removeObject(forKey: key) UserDefaults.standard.synchronize() } //MARK:- PROPORTIONAL SIZE let SCREEN_HEIGHT = UIScreen.main.bounds.size.height let SCREEN_WIDTH = UIScreen.main.bounds.size.width func GET_PROPORTIONAL_WIDTH (width:CGFloat) -> CGFloat { return ((SCREEN_WIDTH * width)/750) } func GET_PROPORTIONAL_HEIGHT (height:CGFloat) -> CGFloat { return ((SCREEN_HEIGHT * height)/1334) } //MARK:- NETWORK ACTIVITY INDICATOR func SHOW_NETWORK_ACTIVITY_INDICATOR(){ UIApplication.shared.isNetworkActivityIndicatorVisible = true } func HIDE_NETWORK_ACTIVITY_INDICATOR(){ UIApplication.shared.isNetworkActivityIndicatorVisible = false } //Check IsiPhone Device func IS_IPHONE_DEVICE()->Bool{ let deviceType = UIDevice.current.userInterfaceIdiom == .phone return deviceType } //Check IsiPad Device func IS_IPAD_DEVICE()->Bool{ let deviceType = UIDevice.current.userInterfaceIdiom == .pad return deviceType } //iPhone 4 OR 4S func IS_IPHONE_4_OR_4S()->Bool{ let SCREEN_HEIGHT_TO_CHECK_AGAINST:CGFloat = 480 var device:Bool = false if(SCREEN_HEIGHT_TO_CHECK_AGAINST == SCREEN_HEIGHT) { device = true } return device } func proportionalFontSize() -> CGFloat { var sizeToCheckAgainst = self if(IS_IPAD_DEVICE()) { sizeToCheckAgainst += 12 } else { if(IS_IPHONE_6P_OR_6SP()) { sizeToCheckAgainst += 1 } else if(IS_IPHONE_6_OR_6S()) { sizeToCheckAgainst += 0 } else if(IS_IPHONE_5_OR_5S()) { sizeToCheckAgainst -= 1 } else if(IS_IPHONE_4_OR_4S()) { sizeToCheckAgainst -= 2 } } return sizeToCheckAgainst } //iPhone 5 OR OR 5C OR 4S func IS_IPHONE_5_OR_5S()->Bool{ let SCREEN_HEIGHT_TO_CHECK_AGAINST:CGFloat = 568 var device:Bool = false if(SCREEN_HEIGHT_TO_CHECK_AGAINST == SCREEN_HEIGHT) { device = true } return device } //iPhone 6 OR 6S func IS_IPHONE_6_OR_6S()->Bool{ let SCREEN_HEIGHT_TO_CHECK_AGAINST:CGFloat = 667 var device:Bool = false if(SCREEN_HEIGHT_TO_CHECK_AGAINST == SCREEN_HEIGHT) { device = true } return device } //iPhone 6Plus OR 6SPlus func IS_IPHONE_6P_OR_6SP()->Bool{ let SCREEN_HEIGHT_TO_CHECK_AGAINST:CGFloat = 736 var device:Bool = false if(SCREEN_HEIGHT_TO_CHECK_AGAINST == SCREEN_HEIGHT) { device = true } return device } //MARK:- DEVICE ORIENTATION CHECK func IS_DEVICE_PORTRAIT() -> Bool { return UIDevice.current.orientation.isPortrait } func IS_DEVICE_LANDSCAPE() -> Bool { return UIDevice.current.orientation.isLandscape } //MARK:- SYSTEM VERSION CHECK func SYSTEM_VERSION_EQUAL_TO(version: String) -> Bool { return UIDevice.current.systemVersion.compare(version, options: NSString.CompareOptions.numeric) == ComparisonResult.orderedSame } func SYSTEM_VERSION_GREATER_THAN(version: String) -> Bool { return UIDevice.current.systemVersion.compare(version, options: NSString.CompareOptions.numeric) == ComparisonResult.orderedDescending } func SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(version: String) -> Bool { return UIDevice.current.systemVersion.compare(version, options: NSString.CompareOptions.numeric) != ComparisonResult.orderedAscending } func SYSTEM_VERSION_LESS_THAN(version: String) -> Bool { return UIDevice.current.systemVersion.compare(version, options: NSString.CompareOptions.numeric) == ComparisonResult.orderedAscending } func SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(version: String) -> Bool { return UIDevice.current.systemVersion.compare(version, options: NSString.CompareOptions.numeric) != ComparisonResult.orderedDescending } 

}