iOS allows each application to monitor up to 20 regions. That seems like a lot, especially when you figure that the regions are registered and can be triggered (entry and exit) even while your app is backgrounded or your phone is on standby. So what do you do when you have more than 20? iOS …
It’s almost time for WWDC17, this year in San Jose, CA instead of San Francisco. I haven’t been in several years because my lottery skills are obviously lacking. I managed to score one this year and I’m pretty excited. What will I take this year? Well, to be honest, taking a laptop to sessions in …
I am currently working on something that will display time in different time zones. However, you need to compare the user’s current time versus those at the target time zones to be accurate. This is what I figured out. It’s easy to get the user’s local time.
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let cal = Calendar(identifier: .gregorian) let date = Date() let hour = cal.component(.hour, from: date) let minute = cal.component(.minute, from: date) let second = cal.component(.second, from: date) print("\nLOCAL TIME: \(hour):\(minute):\(second)\n") |
Now, you need to get the time …
A post about tvOS UIFocus enlightenment and a helper Class that I use to help debug my user interface work. Above you’ll notice four buttons (a screenshot from my actual Apple TV). You’ll also notice a total of eight purple boxes with dashed outlines. Each is labeled in all capitals. Those are instances of my …
If you’ve been involved in tvOS application development, or you’re new to the whole process, you might find this post interesting in regards to user interface. I have recently been involved in tvOS dabbling. I’ve been creating a custom application (no TVML) and I wanted one of those nifty parallax-style buttons that Apple uses in …
This post is silly simple, but in the past, I remember doing things like this using Ranges. You have a 2-line UILabel and you want a bold font for the first line, and then regular for the second. In Swift, this is quite simple and straight-forward. This is all the code you’d need to pull …
If you’re ever using asynchronous network operations (say GET or POST) and want to return data when calling a method, you’ll quickly understand that it’s not so easy. But you’ll see below how you can do this fairly easily. Let’s say you have a Class that handles all kinds of network communication. I call mine …
I recently had a section of user interface where I had a UILabel that took up an iPhone’s full width. It contained text which would be dynamic over time, meaning that the text would update at times. I wanted to place an image icon beside the first character of the label, but I needed to …
I had a view that I rotate a lot, often more than 360 degrees (spins around a few times). Each time it stops, I wanted to determine the resulting “visual” angle. How does one go about doing that? rotateView is a configured CABasicAnimation:
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let rotateView = CABasicAnimation() let randonAngle = arc4random_uniform(361) + 1440 rotateView.fromValue = 0 rotateView.toValue = Float(randonAngle) * Float(M_PI) / Float(randomBetweenNumbers(firstNum: 90.0, secondNum: 180.0))//180.0 let randomSpeed = randomBetweenNumbers(firstNum: 1.5, secondNum: 2.1) rotateView.duration = CFTimeInterval(randomSpeed) rotateView.repeatCount = 0 rotateView.isRemovedOnCompletion = false rotateView.fillMode = kCAFillModeForwards rotateView.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut) innerRing.layer.add(rotateView, forKey: "transform.rotation.z") |
Once done, I dispatch after the randomSpeed duration so I know …
Recently I had a project in a workspace to produce a framework of Objective-C and Swift code – supplied by someone else. I had a devil of a time getting it to build for me. And when I did, I tried to copy it into my own project to use it – to find out somehow …
I recently played around recording audio on my Apple Watch. Doing that was easy enough, and I wanted to send the recorded file from the watch extension to the iOS application – and play it. I started messing around and used sendFile as the communication protocol since it can work in the background (without the …
Recently I was working with watchOS 3 and iOS – transferring data back and forth (not using reply callbacks). I was using .sendMessage, and messages from the iPhone to the watch were very quick. However, messages from the watch to the phone seemed very slow, or so I thought. This is what my receive delegate …
I have a UIImageView that holds album artwork in a project. When I get a new now playing notification, instead of simply setting the image to the image view, I perform a crossfade. It’s a lot prettier that way. No problems so far. Here is a snippet of the crossfading code.
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myfade = CABasicAnimation(keyPath: "contents") myfade.duration = 0.4 myfade.fromValue = largeAlbumCover.image!.cgImage myfade.toValue = artImage!.cgImage myfade.delegate = self largeAlbumCover.layer.add(myfade, forKey: "animateContents") largeAlbumCover.image = artImage! |
Nothing remarkable there. …
I recently had a strange request in regards to a UITableView. You see, the table in a UI could only display 3 rows before scrolling was enabled. Given the minute stature of this table, showing a user that there were more items in it was important. So it was decided that if this table had …
If you have your UITableViews snap to their cells, you’ll end up with a more refined user experience. This solution I have works with cells that are consistent in their height (static). You could always work with dynamic heights if you wanted to.
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func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) { if scrollView == suggestionsTableView { let cellHeight = CGFloat(60.0) let y = targetContentOffset.pointee.y + scrollView.contentInset.top + (cellHeight / 2) let cellIndex = floor(y / cellHeight) targetContentOffset.pointee.y = cellIndex * cellHeight - scrollView.contentInset.top } } |
As you can see cellHeight is a set float value, it’s …
Here it is in Swift 3, it’s a little different. I tried to use hypotf but it didn’t like CGFloat subtraction.
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override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { if touches.first != nil { let pointCenter = CGPoint(x: self.view.frame.width / 2, y: self.view.frame.height / 2) let touchPoint = touches.first?.location(in: self.view) let distance = CGPointDistance(from: pointCenter, to: touchPoint! ) print("distance: \(distance)") } super.touchesBegan(touches, with: event) } func CGPointDistanceSquared(from: CGPoint, to: CGPoint) -> CGFloat { return (from.x - to.x) * (from.x - to.x) + (from.y - to.y) * (from.y - to.y) } func CGPointDistance(from: CGPoint, to: CGPoint) -> CGFloat { return sqrt(CGPointDistanceSquared(from: from, to: to)) } |
Coming from iOS go macOS, I wanted to read keyboard input in my macOS application. Not from a textfield but rather from the window itself. I thought this would be an easy task. After some trial and error, Googling, and then some StackOverflow fishing, I managed to get this to work. It wasn’t exactly straightforward …
I declare this day a fine day having discovered non-Objective-C protocols! No more @objc protocol usage. Now it’s as simple as something like this:
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protocol myDelegate { func report(info:String) } class MyClass: NSObject { var delegate:myDelegate? var serviceType = "hephaestus" init(withServiceType: String){ self.serviceType = withServiceType DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { self.delegate?.report(info: UIDevice.current.name) } } convenience override init() { self.init(withServiceType: "hephaestus") } } |
And then in implementation
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import UIKit class ViewController: UIViewController, myDelegate { // Delegate method func report(info: String) { print("delegate: \(info)") } override func viewDidLoad() { super.viewDidLoad() let mc = MyClass() mc.delegate = self // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } |
This is a really simple example, but it works and seems cleaner to me in Swift.
There may come a time when you’d like to shake a macOS application’s window (or one of them) to reinforce an event. In my case, I am creating a macOS application that serves as a conduit to control aspects of a user experience. It communicates with an iOS application which serves as a kind of …
This may seem simple for many who have been busy developing Watch extensions for the Apple Watch, but it stumped me for about a minute. Not long, but long enough for me to slap my forehead. I have several WKInterfaceControllers with each implementing WCSessionDelegate for communication between iOS application and watch extension. No problem. However …