How to create local scopes in Swift?

by

Update: In Swift 2.0, you just use the do keyword:

do {
    let label = UILabel()
    self.addSubview(label)
    self.titleLabel = label
}

This was true for Swift pre-2.0:

You can define something similar to this:

func locally(@noescape work: () -> ()) {
    work()
}

And then use such a locally block as follows:

locally {
    let g = 42
    println(g)
}

(Inspired by locally in Scala’s Predef object.)

More Related Contents:

  1. Dynamic trim double [closed]
  2. creating custom tableview cells in swift
  3. Return instancetype in Swift
  4. Swift do-try-catch syntax
  5. How to create a global variable?
  6. Swift protocol extension method is called instead of method implemented in subclass
  7. How can I make a weak protocol reference in ‘pure’ Swift (without @objc)
  8. NSURLSession concurrent requests with Alamofire
  9. How to update the constant height constraint of a UIView programmatically?
  10. Check password string strength criteria in Swift
  11. Does Swift have documentation generation support?
  12. Get integer value from string in swift
  13. Why constant constraints the property from a structure instance but not the class instance?
  14. == overload for custom class is not always called
  15. How do I declare a variable that has a type and implements a protocol?
  16. Is it possible to replicate Swifts automatic numeric value bridging to Foundation (NSNumber) for (U)Int8/16/32/64 types?
  17. Convert a Date (absolute time) to be sent/received across the network as Data in Swift?
  18. Cannot invoke initializer for type ‘Range’ with an argument list of type ‘(Range)’
  19. UIBezierPath: How to add a border around a view with rounded corners?
  20. Trapping signals in a Swift command line application
  21. Extensions in my own custom class
  22. Property initializers run before ‘self’ is available
  23. RealityKit vs SceneKit vs Metal – High-Quality Rendering
  24. Getting “file not found” in Bridging Header when importing Objective-C frameworks into Swift project
  25. SwiftUI: Pop to root view when selected tab is tapped again
  26. “classname has no member functionname” when adding UIButton target
  27. Is SwiftUI backwards-compatible with iOS 12.x and older?
  28. No such module ‘RestKit’ with cocoapods and swift
  29. Iterate through a String Swift 2.0
  30. Is there a correct way to determine that an NSNumber is derived from a Bool using Swift?

Leave a Comment