Skip to main content

escaping closure and closure

on

 

Closures are self-contained blocks of functionality that can be passed around and used in your code.



let greeting:(String) -> () = { name in

    print("Hi, \(name)!")

}


birthday("Bebo")

 

  • An escaping closure is a closure that’s called after the function it was passed to returns. In other words, it outlives the function it was passed to.
  • A non-escaping closure is a closure that’s called within the function it was passed into, i.e. before it returns.

Comments

Post a Comment

Popular Posts

Certificate pinning and Alamofire

1.  Alamofire and URLSession.  both help you to make network requests in Swift.   Main advantage for Alamofire: Certificate pinning . It can take some time to sort this out and build this yourself. Asymmetric cryptography :  The second phase uses  public-key cryptography  or  asymmetric cryptography . This is a cryptographic system that uses pairs of keys: Public keys, which are widely disseminated and private keys, which only the owner knows. The third phase uses  symmetric-key cryptography , where you use the same key for both encryption of plaintext and decryption of ciphertext. In other words, you configure the app to reject all but one or a few predefined certificates or public keys. Whenever the app connects to a server, it compares the server certificate with the pinned certificate(s) or public key(s). If and only if they match, the app trusts the server and establishes the connection. You usually add a service’s certificate or public key a...

MVVM and MVC in swift

MVC:  View  is supposed to be inactive and only displays prepared data on demand. Model : It represents simple data. Controller   should work on the   Model   data to prepare it for the   Views , which then display that data. View  is also responsible for notifying the  Controller  about any actions, such as user touches. UIViewController  is supposed to be a  Controller  in the MVC pattern,  MVVM:  The Model View ViewModel (MVVM) is an architectural pattern used in software engineering. Models  hold application data / Content. They’re usually structs or simple classes.  Views  display visual elements and controls on the screen. They’re typically  UIView and UIViewController . xib and storyboards View models  transform model information into values that can be displayed on a view. They’re usually classes, so they can be passed around as references. ViewModel  hides all asynchronous networ...