iOS Development Cheatsheet (Swift Edition)

#iOS Development Cheatsheet

TODO:

[] Screenshots
[] Videos

Note: In order to create your user interface Programmatically make sure withing your projects settings that Main Interface and the Launch Screen File are left blank. also...

Navigate to project settings
Under "App Icons and Launch Images" click on "Use Asset Catalog"
Select "Migrate" on the popup that appears. make new Asset.

ViewController Template

import UIKit

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor=UIColor.whiteColor()
        
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        
    }
}

UITabController Example

import UIKit

class ViewController: UITabBarController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        addChildViewControllers()
        
        print(tabBar.subviews)
    }
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)

        setComposedBtn()
    }
    
    
    private func addChildViewControllers() {
        
        addChildViewController(TestViewController(), title: "Alarms", imageName: "alarm")
        
        addChildViewController(TestViewController(), title: "Sleep Alarm", imageName: "sleep")
        
        addChildViewController(TestViewController(), title: "", imageName: "add")
        
        addChildViewController(TestViewController(), title: "Awake Alarm", imageName: "awake")
        
        addChildViewController(TestViewController(), title: "Settings", imageName: "settings")
        
        // addChildViewController(UIViewController()) ~ Blank

    }
    
    private func addChildViewController(vc: UIViewController, title: String, imageName: String) {
        

        vc.title = title
        vc.tabBarItem.image = UIImage(named: imageName)
        

        let nav = UINavigationController(rootViewController: vc)
        addChildViewController(nav)
    }
    

    lazy private var composeBtn: UIButton = {
        

        let btn = UIButton()
        
        btn.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        
        self.tabBar.addSubview(btn)
        
        btn.addTarget(self, action: "clickComposeBtn", forControlEvents: UIControlEvents.TouchUpInside)
        
        return btn
        }()
    
    private func setComposedBtn() {
        
        let w = tabBar.bounds.width / CGFloat(viewControllers!.count)
        let rect = CGRectMake(0, 0, w, tabBar.bounds.height)

        composeBtn.frame = CGRectOffset(rect, 2 * w, 0)
    }
    
    func clickComposeBtn() {
        print(__FUNCTION__)
    }
}

Variable Examples

var nav: UINavigationController!
var window: UIWindow?

App Delegate Configuration

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var nav:UINavigationController?
    
    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        
        
        var navigationBarAppearace = UINavigationBar.appearance()
        navigationBarAppearace.tintColor = UIColor.redColor()
        navigationBarAppearace.barTintColor = UIColor.redColor()
        navigationBarAppearace.titleTextAttributes = [NSForegroundColorAttributeName:UIColor.whiteColor()]
        
        UINavigationBar.appearance().barStyle = .BlackTranslucent
        UINavigationBar.appearance().tintColor = UIColor.whiteColor()
        
        
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        
        self.window!.backgroundColor = UIColor.whiteColor()
        self.window!.makeKeyAndVisible()
        
        var mainViewController: ViewController? = ViewController(nibName: nil, bundle: nil)
        self.nav = UINavigationController(rootViewController: mainViewController!)
        
        self.window!.rootViewController = self.nav
        self.nav!.setNavigationBarHidden(true, animated: false)
        return true
        
    }

Creating a Image Programmatically

var imageView = UIImageView(frame: CGRectMake(20, 400, 100, 150));
var image = UIImage(named: "image.jpg");
imageView.image = image;
self.view.addSubview(imageView);

Creating a Circular Image (with a border)

imageView.layer.cornerRadius = imageView.frame.size.width / 2
imageView.layer.borderColor = UIColor.whiteColor().CGColor
imageView.layer.borderWidth = 1.0
imageView.clipsToBounds = true

Creating a Label Programmatically

        var label = UILabel(frame: CGRectMake(120, 80, 150, 100));
        label.center = CGPointMake(160, 284);
        label.textAlignment = NSTextAlignment.Center;
        label.text = "Hello, World!";
        label.numberOfLines=4;
        self.view.addSubview(label);

Creating a Button Programmatically

        var button = UIButton(frame: CGRectMake(20, 20, 280, 40));
        button.backgroundColor=UIColor.blueColor();
        button.setTitle("Button Text", forState: .Normal);
        button.setTitleColor(UIColor.yellowColor(), forState: .Normal);
        button.alpha=0.6;
        button.layer.borderWidth=0.3;
        button.layer.cornerRadius=2;
        
        // Button Action
        // NOTE: "goToOtherViewController" is a function that performs what the button should do.
        
        button.addTarget(self, action: "goToOtherViewController", forControlEvents: .TouchUpInside);
        button.titleLabel!.textAlignment=NSTextAlignment.Center;
        self.view.addSubview(button);

Action Example (ViewController Redirection)

    func goToOtherViewController(){
    
        self.navigationController!.pushViewController(secondViewController(), animated: false);
        
        }

Date Picker Programmatically

        
        var datepick=UIDatePicker(frame:CGRectMake(20, 80, 280, 100));
        datepick.datePickerMode = UIDatePickerMode.Date;
        self.view.addSubview(datepick);

WebView Programmatically

        var webview=UIWebView(frame:CGRectMake(20, 240, 280, 310));
        var url = NSURL(string: "https://twitter.com/migos");
        var request = NSURLRequest(URL: url!);
        webview.scalesPageToFit=true;
        webview.loadRequest(request);
        self.view.addSubview(webview);

CGRectMake Parameters

CGRectMake(x, y, width, height)

Change status bar color (white)

Status bar style: UIStatusBarStyleLightContent
View controller-based status bar appearance: NO
Status bar is initially hidden: NO Add this to your AppDelegate

UIApplication.sharedApplication().statusBarStyle = UIStatusBarStyle.LightContent

Navigation Bar Tint Color

nav.navigationBar.barTintColor = rgbaToUIColor(r: 52, g: 86, b: 121, a: 1.0)

Navigation Bar Text Color

nav.navigationBar.titleTextAttributes = [UITextAttributeTextColor: UIColor.whiteColor()]

AlertView

var alertView=UIAlertView();
alertView.title="Ayy Lmao";
alertView.addButtonWithTitle("K Then");
alertView.message="oh its lit";
alertView.show();

Label Size

label.font = label.font.fontWithSize(20)

Set view background to a resource image

self.view.backgroundColor = UIColor(patternImage: UIImage(named: "bg.jpg")!)

Adding a Navigation Bar

import UIKit

class ViewController: UIViewController, UINavigationBarDelegate {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }
    
    override func viewDidAppear(animated: Bool) {
        
        // Create the navigation bar
        let navigationBar = UINavigationBar(frame: CGRectMake(0, 20, self.view.frame.size.width, 44)) // Offset by 20 pixels vertically to take the status bar into account
        navigationBar.backgroundColor = UIColor.whiteColor()
        navigationBar.delegate = self;
        
        // Create a navigation item with a title
        let navigationItem = UINavigationItem()
        navigationItem.title = "Title"
        
        // Create left and right button for navigation item
        let leftButton = UIBarButtonItem(title: "Left", style: UIBarButtonItemStyle.Plain, target: self, action: nil)
        let rightButton = UIBarButtonItem(title: "Right", style: UIBarButtonItemStyle.Plain, target: self, action: nil)
        
        // Create two buttons for the navigation item
        navigationItem.leftBarButtonItem = leftButton
        navigationItem.rightBarButtonItem = rightButton
        
        // Assign the navigation item to the navigation bar
        navigationBar.items = [navigationItem]
        
        // Make the navigation bar a subview of the current view controller
        self.view.addSubview(navigationBar)
    }
    
    func positionForBar(bar: UIBarPositioning!) -> UIBarPosition {
        return UIBarPosition.TopAttached
    }
}

Some Pretty Colors

extension UIColor {
    convenience init?(hex: String?){
        var rgbValue: CUnsignedLongLong = 0
        var scanner = NSScanner(string: hex!)
        if hex?.hasPrefix("#") == true {scanner.scanLocation = 1}
        scanner.scanHexLongLong(&rgbValue)
        var color = UIColor(red: CGFloat((rgbValue & 0xFF0000) >> 16)/255.0,
            green: CGFloat((rgbValue & 0x00FF00) >> 8)/255.0,
            blue: CGFloat(rgbValue & 0x0000FF)/255.0, alpha: 1.0)
        self.init(CGColor: color.CGColor)
    }
    var PSRed: UIColor          {return UIColor(hex: "#F44336")!}
    var PSPink: UIColor         {return UIColor(hex: "#E91E63")!}
    var PSPurple: UIColor       {return UIColor(hex: "#9C27B0")!}
    var PSDarkPurple: UIColor   {return UIColor(hex: "#673AB7")!}
    var PSIndigo: UIColor       {return UIColor(hex: "#3F51B5")!}
    var PSBlue: UIColor         {return UIColor(hex: "#2196F3")!}
    var PSCyan: UIColor         {return UIColor(hex: "#00BCD4")!}
    var PSTeal: UIColor         {return UIColor(hex: "#009688")!}
    var PSGreen: UIColor        {return UIColor(hex: "#4CAF50")!}
    var PSLightGreen: UIColor   {return UIColor(hex: "#8BC34A")!}
    var PSYellow: UIColor       {return UIColor(hex: "#FFEB3B")!}
    var PSLightOrange: UIColor  {return UIColor(hex: "#FFC107")!}
    var PSOrange: UIColor       {return UIColor(hex: "#FF9800")!}
    var PSDarkOrange: UIColor   {return UIColor(hex: "#FF5722")!}
    var PSBrown: UIColor        {return UIColor(hex: "#795548")!}
    var PSGrey: UIColor         {return UIColor(hex: "#9E9E9E")!}
    var PSLightGrey: UIColor    {return UIColor(hex: "#EEEEEE")!}
    var PSDarkGrey: UIColor     {return UIColor(hex: "#424242")!}
}

Usage (Example):

UIColor().PSGreen

dzt/ios.md