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Mobile Development Articles
Page 147 of 156
What is "Processing Symbol Files" message in Xcode?
Processing symbol files is a message displayed on xcode when we create a project’s build. When this message appears, in background Xcode downloads files and symbol files for specific device and a specific processor on which build shall be installed.The symbol files contains debug symbols which are used to debug on specific processor and iOS version and when some crash or error occurs, those symbols are used to create crash reports. Once processing symbols is done a new folder with device symbols is created in the library, usually under “~/Library/Developer/Xcode/iOS DeviceSupport/ “.Sometimes our system might get stuck on this step ...
Read MoreWhat is embedded bitcode and what does ENABLE_BITCODE do in xcode?
Bitcode – Bitcode is an intermediate reperesentation of how the code looks. This code can not be used by us or can’t be installed on a device. When we upload our application to the app store It is uploaded as an bitcode and later converted to app binary by itunes/Apple.When the Intermediate code is created an uploaded to the App store or run on the device, a program called LLMV takes over the control and converts the Intermediate code to a Binary file which is x86 32Bit or x86 64 bit for the simulator and ARM for the actual iOS handheld ...
Read MoreHow to Add Live Camera Preview to UIView in Swift?
To add a live camera preview to our default UIView in swift we can either use AVFoundation framework of iOS SDK or native UIImagePickerController(). In this example we’ll be using ImagePicker as our aim is to present camera preview on the UIView and Imagepicker is suitable for that task. AVFoundation can be used when we need a lot of customization on our camera or different types of custom actions.To show a camera preview on the UIView we need to perform the following steps.Create a UIImagePickerController object.Conform our class to UIImagePickerControllerDelegate and UINavigationControllerDelegate.Assign delegates to the object we created in step ...
Read MoreHow to make iPhone vibrate using Swift?
To make an iPhone vibrate using swift we’ll use two different methods. First create a new project and add Four different buttons to the main View controller.Now import the AudioToolbox framework in your view controller class.For the first button add an action and write the following code as shown below:@IBAction func actionButtonOne(_ sender: Any) { AudioServicesPlayAlertSound(SystemSoundID(kSystemSoundID_Vibrate)) }This will generate a long vibrating feedback on your device. Now to create more vibration effects on devices with iOS 10 or more we’ll add methods for all four different buttons.@IBAction func actionButtonTwo(_ sender: Any) { let generator = UIImpactFeedbackGenerator(style: .heavy) ...
Read MoreHow to open and close a PDF file using Swift?
In this article we’ll see how to open a pdf file using swift in iOS. Here we’ll do it with an example of opening pdf in webView in iOS. Let’s create a project and add WKWebView to the storyboard.Connect it’s outlet to the ViewController class.Now we’ll see two different thingsOpening a PDF file from a URL on the web.To open a web view from a url, first we need to have a url with a pdf file. In this example I’ll be using a dummy URL https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdfLet’s create a URL first, let url: URL! = URL(string: "https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf")Now the remaining steps ...
Read MoreHow to programmatically add a UISegmentedControl to a container view?
To add a UISegmentControl in iOS with swift we’ll have to first create a segment control and it’s controller function, i.e. it’s action. Let’s see those steps.Let’s create a function to add a segmented control.func addControl() { let segmentItems = ["First", "Second"] let control = UISegmentedControl(items: segmentItems) control.frame = CGRect(x: 10, y: 250, width: (self.view.frame.width - 20), height: 50) control.addTarget(self, action: #selector(segmentControl(_:)), for: .valueChanged) control.selectedSegmentIndex = 1 view.addSubview(control) }This function may be called in our view controller to add the segmented control, let’s add action for ...
Read MoreHow to draw a route between two locations using MapKit in Swift?
To draw a route between two Locations on map we need to have co-ordinates of both those locations.Once we have the co-ordinates of both locations we can use the below given function to show the line between two points on map. In this example I’ll be using two random location as two points.func getDirections(loc1: CLLocationCoordinate2D, loc2: CLLocationCoordinate2D) { let source = MKMapItem(placemark: MKPlacemark(coordinate: loc1)) source.name = "Your Location" let destination = MKMapItem(placemark: MKPlacemark(coordinate: loc2)) destination.name = "Destination" MKMapItem.openMaps(with: [source, destination], launchOptions: [MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving]) }We’ll call this function in ViewDidLoad for this tutorial to show the ...
Read MoreExact Radius and Size of iPhone App Icons
Every iPhone application needs some icons that are displayed when certain events occur, like when some new notification comes, or the icon for home screen or the icon that is displayed on spotlight.All these icons have different size properties but apart from their size there are some common properties they have. Let’s see them first.The icons should be in .png formatThe icons should be flat and should not have transparency.The images should be squared, without any round corners.For any iOS device the icons size for app store is 1024px * 1024pxOther app icon sizes are usually bases on 1x, 2x ...
Read MoreHow to detect which iOS version is running on the device?
When working on iOS applications, we sometimes need to know the version that's running on an iPhone device. In this article we'll learn how to find the iOS version being used, using an iOS Application.Create an iOS application and in it's viewController's view did load function write the following code.print(" System version - ",UIDevice.current.systemVersion)This will return the iOS version of the device currently in use. Like current version of my simulator is iOS 12.0 hence the result comes asSystem Version – 12.0
Read MoreWhere are iOS simulator screenshots stored?
The screenshots taken on an simulator are stored usually on desktop of the system that you are using.There are multiple scenarios in which screenshots could have been taken, some of them are mentioned below.When the images are taken using "Command" + S, or from File menu's New Screenshot option, They are usually stored by name similar to "Simulator Screen Shot - iPhone 7 Plus - 2018-12-26 at 18.18.14" which consists of Simulator running currently followed by date in YYYY-MM-DD at HH:MM:SS format.If they are taken with mac's "Command + shift +3" or "command + shift + 4" buttons, they are ...
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