Swift iOS Code Recipes

Swift iOS Recipes

Swift iOS Recipes
==================

** GUI Layout ** 

Alerts

        var alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
        alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
        self.presentViewController(alert, animated: true, completion: nil)

Buttons on navigation

        let newButton = UIBarButtonItem(barButtonSystemItem: .Edit, target: self, action: "doSomething:")
        self.navigationItem.leftBarButtonItem = newButton

Button

		let button   = UIButton.buttonWithType(UIButtonType.System) as UIButton
	    button.frame = CGRectMake(100, 100, 100, 50)
	    button.backgroundColor = UIColor.greenColor()
	    button.setTitle("Test Button", forState: UIControlState.Normal)
	    button.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)

		button.layer.cornerRadius = 5
		button.layer.borderWidth = 1
		button.layer.borderColor = UIColor.blackColor().CGColor
			    
	    self.view.addSubview(button)

	    func buttonAction(sender:UIButton!) {
	    }	    

Labels

        newLabel = UILabel(frame: CGRect(x: 20, y: 10, width: 300, height: 200))
        newLabel.text = "Tap and hold for settings"
        newLabel.textColor = UIColor.whiteColor()
        newLabel.textAlignment = NSTextAlignment.Center
        newLabel.font = UIFont(name: "HelveticaNeue", size: CGFloat(17))

Slider

        var slider = UISlider(frame: CGRectMake(0, 0, 300, 200))
        slider.addTarget(self, action: "changeSomething:", forControlEvents: UIControlEvents.ValueChanged)
        slider.backgroundColor = UIColor.blackColor()
        slider.minimumValue = 0.0
        slider.maximumValue = 1.0
        slider.continuous = true
        slider.value = 0.5
        self.view.addSubview(slider)

        func changeSomething(sender:UISlider!) {
            self.someValue = sender.value
        }


Dimensions

		var screenSize: CGRect = UIScreen.mainScreen().bounds

Collection View

        let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
        layout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
        layout.itemSize = CGSize(width: 120, height: 90)

		collectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
        collectionView!.dataSource = self
        collectionView!.delegate = self
        collectionView!.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)
        collectionView!.backgroundColor = UIColor.blackColor()
        self.view.addSubview(collectionView!)

Table View

        tableView = UITableView(frame: self.view.frame, style: .Plain)
        self.view.addSubview(tableView)
        tableView.delegate = self
        tableView.dataSource = self
        tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: cellIdentifier)        

Image View
	
		var frame = self.view.frame
        someImage = UIImageView(frame: CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height))


Transitions

	Pushes

        let vc = SettingsViewController()
        self.navigationController?.pushViewController(vc, animated: true)

    Segues (have to use IB to set up segue identifiers)


Constraints with Masonry Snap

        let padding = UIEdgeInsetsMake(10, 10, 10, -50)
        let superview = self.view
        
        someView.snp_makeConstraints { make in
            make.top.equalTo(superview.snp_top).with.offset(padding.top)
            make.left.equalTo(superview.snp_left).with.offset(padding.left)
        }


** GUI Events **

Gray Activity Indicator View

        var activityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: .Gray)
        view.addSubview(activityIndicatorView)
        activityIndicatorView.center = view.center
        activityIndicatorView.startAnimating()

        activityIndicatorView.removeFromSuperview()

Touches

        press = UILongPressGestureRecognizer(target: self, action: "doSomething:")
        press.minimumPressDuration = 0.5
        press.numberOfTapsRequired = 0
        press.numberOfTouchesRequired = 1
        press.delegate = self
        self.view.addGestureRecognizer(press)


Notifications

        NSNotificationCenter.defaultCenter().addObserver(
            self,
            selector: "doSomething:",
            name: someKey,
            object: nil)

		func doSomething(notification: NSNotification) {	        
	    }

App Delegate setup

        let rootViewController = SomeViewController()
        let frame = UIScreen.mainScreen().bounds
        self.window = UIWindow(frame: frame)
        let navController = UINavigationController(rootViewController: rootViewController)
        self.window?.rootViewController = navController
        self.window?.backgroundColor = UIColor.whiteColor()
        self.window?.makeKeyAndVisible()

Delegates

		protocol NewDelegate {
		    func doSomething()
		}

		In class:

			var delegate: NewDelegate?

			self.delegate?.doSomething()

		In target class:

			Inherit from NewDelegate
			newObject.delegate = self
			Implement the protocol methods