Why you got this error Previously, your attributes is defined as [String: Any], where the key comes from NSAttributedStringKey as a string or NSAttributedString.Key in Swift 4.2 During the migration, the compiler tries to keep the [String: Any] type. However, NSAttributedStringKey becomes a struct in swift 4. So the compiler tries to change that to … Read more
Try this one it’s Working code (Swift 4). func NKPlaceholderImage(image:UIImage?, imageView:UIImageView?,imgUrl:String,compate:@escaping (UIImage?) -> Void){ if image != nil && imageView != nil { imageView!.image = image! } var urlcatch = imgUrl.replacingOccurrences(of: “https://stackoverflow.com/”, with: “#”) let documentpath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] urlcatch = documentpath + “https://stackoverflow.com/” + “\(urlcatch)” let image = UIImage(contentsOfFile:urlcatch) if image != nil … Read more
This is a consequence of SE-0170 NSNumber bridging and Numeric types, implemented in Swift 4: as? for NSNumber should mean “Can I safely express the value stored in this opaque box called a NSNumber as the value I want?”. 1.12 is a floating point literal, and inferred as a Double, so NSNumber(value: 1.12) is “boxing” … Read more
Using Swift 5.1, you may choose one of the three following ways in order to solve your problem. #1. Using Decodable init(from:) initializer Use this strategy when you need to convert from String to Float for a single struct, enum or class. import Foundation struct ExampleJson: Decodable { var name: String var age: Int var … Read more
The Swift standard library defines 3 overloads for flatMap function: Sequence.flatMap<S>(_: (Element) -> S) -> [S.Element] Optional.flatMap<U>(_: (Wrapped) -> U?) -> U? Sequence.flatMap<U>(_: (Element) -> U?) -> [U] The last overload function can be misused in two ways: Consider the following struct and array: struct Person { var age: Int var name: String } let … Read more
In iOS 11, you don’t have to. Just let the observer go out of scope. There is no penalty any longer for letting an observer die before the observed or for letting the observed die before the observer, so you have no actual work to do. On the other hand, if you really want to … Read more
In Swift 3 you can omit the associated value of type Void: let res: Result<Void> = .success() In Swift 4 you have to pass an associated value of type Void: let res: Result<Void> = .success(()) // Or just: let res = Result.success(())
In swift4 You can solve this issue with DispatchQueue.main.async { UIApplication.shared.registerForRemoteNotifications() } Hope this will help…
Assuming you left out the { and } that would surround this block and are required for this to be valid JSON, the following is the simplest solution to getting things parsed, you really don’t need to deal with CodingKey at all since your names match the keys in the JSON, so the synthesized CodingKey … Read more
There’s a subtle, but important difference between these two lines of code: // Exhibit 1 foo = try container.decode(Int?.self, forKey: .foo) // Exhibit 2 foo = try container.decodeIfPresent(Int.self, forKey: .foo) Exhibit 1 will parse: { “foo”: null, “bar”: “something” } but not: { “bar”: “something” } while exhibit 2 will happily parse both. So in … Read more