In Swift 2.0, Apple introduced a new way to handle errors (do-try-catch). And few days ago in Beta 6 an even newer keyword was introduced (try?). Also, knew that I can use try!. What’s the difference between the 3 keywords, and when to use each? 1 Answer 1
I am trying to calculate the height of a UILabel based on different String lengths. func calculateContentHeight() -> CGFloat{ var maxLabelSize: CGSize = CGSizeMake(frame.size.width – 48, CGFloat(9999)) var contentNSString = contentText as NSString var expectedLabelSize = contentNSString.boundingRectWithSize(maxLabelSize, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont.systemFontOfSize(16.0)], context: nil) print(“\(expectedLabelSize)”) return expectedLabelSize.size.height } Above is the current function I use … Read more
After converting code to latest swift 3.0 I am shown this error. Also tell me solution for CGSize = CGSizeMake(0,0) static var frameAtStartOfPan: CGRect = CGRectZero static var startPointOfPan: CGPoint = CGPointZero Which is also unavailable. 11 Answers 11
I have lots of code in Swift 2.x (or even 1.x) projects that looks like this: // Move to a background thread to do some long running work dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) { let image = self.loadOrGenerateAnImage() // Bounce back to the main thread to update the UI dispatch_async(dispatch_get_main_queue()) { self.imageView.image = image } } Or stuff … Read more
I am getting this error while building the SwiftJSON framework to the Some Xcode project through Carthage Dependency Manager. Sivaramaiahs-Mac-mini:GZipDemoApp vsoftMacmini5$ carthage update –platform iOS *** Fetching GzipSwift *** Fetching SwiftyJSON *** Checking out GzipSwift at “3.1.1” *** Downloading SwiftyJSON.framework binary at “3.1.3” *** xcodebuild output can be found in /var/folders/7m/y0r2mdhn0f16zz1nlt34ypzr0000gn/T/carthage-xcodebuild.apLXCc.log A shell task (/usr/bin/xcrun … Read more
I am defining a custom error type with Swift 3 syntax and I want to provide a user-friendly description of the error which is returned by the localizedDescription property of the Error object. How can I do it? public enum MyError: Error { case customError var localizedDescription: String { switch self { case .customError: return … Read more
The ObjectiveC.swift file from the standard library contains the following few lines of code around line 228: extension NSObject : Equatable, Hashable { /// … open var hashValue: Int { return hash } } What does open var mean in this context, or what is the open keyword in general? 5 Answers 5
In earlier versions of Swift, one could create a delay with the following code: let time = dispatch_time(dispatch_time_t(DISPATCH_TIME_NOW), 4 * Int64(NSEC_PER_SEC)) dispatch_after(time, dispatch_get_main_queue()) { //put your code which should be executed with a delay here } But now, in Swift 3, Xcode automatically changes 6 different things but then the following error appears: “Cannot convert … Read more
In Swift 2, I was able to create queue with the following code: let concurrentQueue = dispatch_queue_create(“com.swift3.imageQueue”, DISPATCH_QUEUE_CONCURRENT) But this doesn’t compile in Swift 3. What is the preferred way to write this in Swift 3? 15 Answers 15