Logo

Go on. Explore!

lvl 0 • 0 xp

lvl 1

HomeMarketDecksInterests
Midterm 2 Swift

Midterm 2 Swift

memorize.aimemorize.ai (lvl 286)
Star 0%
Star 0%
Star 0%
Star 0%
Star 0%
(0)
(0)
(0)
49 cards
()
Section 1

Preview this deck

Core Data

Front

1 / 49

iOS DevSwift
Star 0%
Star 0%
Star 0%
Star 0%
Star 0%

0.0

0 reviews

5
0
4
0
3
0
2
0
1
0

Active users

0

All-time users

0

Favorites

0

Last updated

7 years ago

Date created

Mar 1, 2020

Cards (49)

Section 1

(49 cards)

Core Data

Front

A database on your device that builds a graph of objects. Graph is automatically serialized and put into database. Create "fetches" to access stuff that are turned into DB queries.

Back

Multi-threading in iOS

Front

Run multiple parts of an app simultaneously, handle long-running activities, and block activities.

Back

How to make a Table View

Front

1.) Select and drag in a table view to your controller 2.) Create an outlet for it in your view controller class 3.) Make view controller class conform to UITableViewDelegate, UITableViewDataSource protocols. First one is a delegate for the view and display, second one is a delegate for the data of the view. 4.) add didSet {} to the Table View outlet >> put in .delegate = self, and .dataSource = self. This sets the delegates to the view. 5.) - func numberOfSections(...) -> Int {} defines the number of sections (demo sets it to 1). - func tableView(...) -> Int {} defines number of rows in each section. - func tableView(...) -> UITableViewCell {} defines the data in the cells. 6.) Make a cell class that is a subclass of UITableViewCell. 7.) Increment the prototype cells counter to add a cell. Put whatever you want in it. 8.) Select the prototype cell and in the attribute inspector choose custom class = the cell class you just made. 9.) Make outlets in your cell class for the items in your prototype cell (by dragging them). 10.) In the func tableView() -> UITableViewCell {}, create var = tableViewOutlet.dequeueReusableCell(...) -> withIdentifier: <your cell class> for: indexPath 11.) Downcast from the var you made (default cell) to your cell and in the if statement you can modify the outlets to display data.

Back

Main Queue (serial)

Front

let mainQ = DispatchQueue.main All UI activity here (no long-running, non-UI stuff).

Back

Table View

Front

A single column of vertically scrolling content divided into rows. Some rows can be sectioned. **UIScrollView subclass **Example app: Contacts

Back

Lifecycle: Creation

Front

Creation from xib (XML nib) awakeFromNib() called very early

Back

How to access data in Core Data

Front

let cntr = (UIApplication.shared.delegate as! AppDelegate).persistentContainer let context: NSManagedObjectContext = cntr.viewContext

Back

UTI

Front

Universal Type Identifier represents types of files that you can handle such as com.adobe.pdf. CFBundleTypeRole and LSHandleRank say how you handle it.

Back

Global Queue (concurrent)

Front

let backgroundQ = DispatchQueue.global(qos: <...>) In <...> you can have: .userInteractive = high priority, short .userInitiated = high priority, longer .background = not user created, slow .utility = system maintenance

Back

UITextField

Front

Takes input from the user with the on-screen keyboard. User inputs text when the becomeFirstResponder() method is called either by tapping the text field or calling the method directly. resignFirstResponder() closes the keyboard, such as when the user hits "done".

Back

textFieldShouldReturn(sender: UITextField) -> Bool

Front

Decides whether to do normal processing on <return> key. Must resign first responder here.

Back

viewWillLayoutSubviews, viewDidLayoutSubviews

Front

Boundaries about to change or have changed.

Back

Grand Central Dispatch

Front

Achieve multi-threading with queues, lock-based synchronization, barriers, etc.

Back

viewWillTransition

Front

Used to handle auto-rotation.

Back

Lifecycle: viewDidLoad

Front

Primary place to do app-specific setup since the view is in place. - outlets are set - bounds are not set - called once

Back

How to create a UIDocument

Front

1) define URL 2) call the only init 3) set your model var url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! url = url.appendingPathComponent("foo.bar") let myDocument = Doc436(fileURL: url)

Back

Core Data Types

Front

Numbers = Double, Int, etc. Binary data = NSData's Dates = NSDate's Relationships = To-many are NSSet's = To-one are NSManagedObject's

Back

File System Sandbox

Front

1) Privacy 2) Security 3) Cleanup

Back

Elements of Core Data

Front

Entities = Classes (tables) Attributes = Properties (columns) Relationships = References (foreign keys) **Access through an NSManagedObjectContext from a NSPersistentContainer**

Back

UIDocumentBrowserController

Front

Controls the menu where you can access user documents. Perform functions like opening, closing, renaming, moving, iCloud, Drobox, etc. You can define your own document template and handle them.

Back

Querying Core Data

Front

How to make a query: = create the request request: NSFetchRequest let fetchRides: NSFetchRequest<Ride> = Ride.fetchRequest() NSSortDescriptors for ordering of results - set of descriptors [first-sort, second-sort] NSPredicate boolean for filtering

Back

MapKit

Front

Makes it easy to bring up a map: - show specific region MKMapView.setRegion(..) - current position (option when adding mapview in storyboard) Options for type .standard or .satellite. Add to the map via annotations or overlays.

Back

Document states

Front

1) .open = document is open and ready 2) .closed = document is closed 3) .savingError = override handleError to see why 4) .editingDisabled = the document cannot currently be edited 5) .progressAvailable = how far document is in getting loaded (check progress var) 6) .inConflict = someone else edited this document (iCloud)

Back

Lifecycle: viewDidAppear

Front

View is on-screen. Use for UI tasks (animations, GPS, etc)

Back

dataSource

Front

A tableView property that provides data to the view. Remember that *views don't own their data* it acts like a delegate.

Back

Static Cells vs Dynamic Prototypes

Front

In a Table View, if "static cells" is selected it means the view won't scroll. If "Dynamic Prototypes" is selected then the view will scroll since it's dynamically mapping content to the views.

Back

How to store distances & locations

Front

- Store an array of gps locations - Can get distances between last locations in meters (.distance) - You can also have a list of locations loaded in via a plist. Must be stored as Data and decoded.

Back

How to use Core Data

Front

1) Start project with core data selected. 2)

Back

Lifecycle: viewDidDisappear

Front

View is on-screen but about to go. Wind things down (like animations, GPS, etc.)

Back

Prototype Cells

Front

A default cell that new cells are cloned from. In table view attr inspector, increment "Prototype Cells" to generate one.

Back

MKMapViewDelegate, MKAnnotation

Front

View controller class must conform to MKMapViewDelegate. Make an object that conforms to MKAnnotation. Add annotation object to mapview w/ addAnnotation(_:). Next, add implementation for mapView(_: viewFor:) to provide view for the annotation.

Back

Collection View

Front

Organizes data into individual items, which can then be grouped into sections for presentation. (An item is the smallest unit of data you want to present). Presents these items using cells. **UIScrollView subclass

Back

URLSessions

Front

Fetch contents of an http URL into a Data. *NOT on the main queue*

Back

UITextInputTraits

Front

A protocol implemented by UITextField that modified keyboard appearance.

Back

URLs in iOS

Front

Can be local through (usually the "main") bundle: - URL = Bundle.main.URL(forContent: "pretty", withExtension: "jpg" Can be remote through normal URL: - URL = URL(string: "http://kelehers.me/orion.jpg") Usage in file system dirs: let url: URL = FileManager.default.url( for directory:.documentDirectory, in domainMask: .userDomainMask appropriateFor: nil, create: true ) // always .userDomainMask on iOS //

Back

APFS

Front

Apple File System: - optimized for solid-state drives - copy-on-write - deduplication - zero-cost copies - reliability - file system snapshots (not yet used by Time Machine) - dynamic volume sizing

Back

Serial vs Concurrent queues

Front

Serial = single-thread let serialQ = DispatchQueue(label: "MySerial") Concurrent = multi-thread let concurrentQ = DispatchQueue(label: "MyConcurrent", attributes: .concurrent)

Back

UIDocument

Front

An abstract base class. Must be subclassed to use and implement methods tht read/write Data. Used if an app stores "documents" from user perspective and iOS can manage the storage. - All interaction with storage, including DropBox, Drive, iCloud... - Async API - Autosaving - Visible in Files app

Back

CLLocationManagerDelegate

Front

Location manager delegate that must be made superclass of view controller class and implemented. .desiredAccuracy = accuracy of GPS tracking. More accurate = more power consumption.

Back

Add/Delete/Save to Core Data

Front

Add = must give context for a new object let ride = Ride(context: AppDelegate.viewContext) ride.name = name ride.when = Date() ride.distance = distance Save = try context.save() Del = managedObjectContext.delete(_ object: location)

Back

Reusable Cells

Front

dequeueReusableCell(withIdentifier:) grabs a cell from the reuse pool.

Back

Exported UTI

Front

Custom document types defines by your app. Key is public.filename-extension and value is the name of your document type.

Back

Lifecycle: viewWillAppear

Front

Right before view appears on screen. - called many times - use for changes between screens *view doesn't always appear*

Back

How to persist a UIDocument

Front

Turn it into a Data to be persisted: override func contents(forType typeName: String) throws -> Any { } Retrieve your document from a Data: override func load(fromContents contents: Any, ofType typeName: String?) throws { }

Back

Core Location

Front

Framework for working with location services. Must authorize first with user (by asking or hitting a button). Must add NSLocationAlwaysUsageDescription in info.plist: .authorizedAlways .authorizedWhenInUse - stops when app closed (not background)

Back

Lifecycle: viewDidDisappear

Front

View is gone. Rarely used, maybe to de-allocate memory.

Back

Link to doc

Front

https://docs.google.com/document/d/1YB6dB-287e0w3YIVBgn0FrLNHwwtR1z476k-B7XnSEY/edit#

Back

How to open/save/close a UIDocument

Front

myDoc.open = opens file on success *asynchronous* myDoc.updateChangeCount(.done) = saves file myDoc.close = closes file on success

Back

LowMemory

Front

Rarely used but called when you're low on memory. Probably indicative of a memory leak.

Back