Update for Swift 2: All integer types have an public init?(_ text: String, radix: Int = default) method now, which converts a string to an integer according to a given base: let binary = “11001” if let number = Int(binary, radix: 2) { print(number) // Output: 25 } (Previous answer:) You can simply use the … Read more
The problem, as you have said, is in these lines: if segue.identifier == “patternDetailSegue” { var detailViewController = segue.destinationViewController as! PatternDetailViewController // Could not cast value of type ‘UIViewController’ to ‘Patternz.PatternDetailViewController’ The error message tells you that the destinationViewController of this segue is not, in fact, a PatternDetailViewController. You may think it is, but it … Read more
For some reason I could not make work any of the above, but it did inspire me find a solution that did in my case. It’s not as flexible as others, but could easily be adapted to support both axes of scrolling. import SwiftUI struct OverflowContentViewModifier: ViewModifier { @State private var contentOverflow: Bool = false … Read more
This is likely occurring because the flow layout “xyz” is modifying attributes returned by UICollectionViewFlowLayout without copying them And sure enough, that’s just what you are doing: private override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? { let attributes = super.layoutAttributesForItemAtIndexPath(indexPath) let distance = CGRectGetMidX(attributes!.frame) – self.midX; var transform = CATransform3DIdentity; transform = CATransform3DTranslate(transform, -distance, 0, -self.width); … Read more
Swift 3/4 Syntax Here’s an update with the Swift 3 Syntax: UIView.animate(withDuration: 0.5, delay: 0.3, options: [.repeat, .curveEaseOut, .autoreverse], animations: { self.username.center.x += self.view.bounds.width }, completion: nil) If you need to add a completion handler just add a closure like so: UIView.animate(withDuration: 0.5, delay: 0.3, options: [.repeat, .curveEaseOut, .autoreverse], animations: { // animation stuff }, … Read more
With Swift 5, you can use one of the four following ways in order to tests if all elements of an array are equal. #1. Using Array‘s allSatisfy(_:) method allSatisfy(_:) returns a Boolean value indicating whether every element of a sequence satisfies a given predicate. You can set the predicate to test if all elements … Read more
Sure this sounds confusing and can be debated. However, from the best practices i can put some suggestions. Singleton is usually used to create a resource intensive and one timer initialisation for instance: a database connector, login handler and such. Utility class are classes that only have static functions and variables. It should not deal … Read more
All of the asked situations are now supported in iOS 15 Destructive: (works from iOS 15) Set .destructive as the role argument of the button: Button(role: .destructive) { // 👈 This argument // delete something } label: { Label(“Delete”, systemImage: “trash”) } Disabled: (works from iOS 14.2) Add .disabled modifier to the button. Button { … Read more
Actually your test dictionary[key] == nil can be used to check if a key exists in a dictionary. It will not yield true if the value is set to nil: let dict : [String : Int?] = [“a” : 1, “b” : nil] dict[“a”] == nil // false, dict[“a”] is .some(.some(1)) dict[“b”] == nil // … Read more
Swift ≧ 3 Swift 3 makes this a lot easier. let fallsBetween = (startDate … endDate).contains(Date()) Now that NSDate is bridged to the value type Date and Date conforms to Comparable we can just form a ClosedRange<Date> and use the contains method to see if the current date is included. Caveat: endDate must be greater … Read more