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Apple Wallet  (referred to as simply  Wallet ) is an application in  Apple 's iOS (previously known as Passbook  in iOS 6 to iOS 8) that allows users to store coupons, boarding passes, event tickets, store cards and, starting with iOS 8.1, credit cards, loyalty cards, and debit cards via  Apple  Pay. With Wallet, you can keep your credit, debit, and prepaid cards, store cards, boarding passes, movie tickets, coupons, rewards cards, and more in one place. Add passes: You can add passes to Wallet in several ways: Using Wallet-enabled apps With Mail or Messages Through a web browser Scanning a barcode Sharing through AirDrop From your Mac Tapping a Wallet notification that you got after paying with Apple Pay at a supported merchant   Use your passes Some passes automatically appear at the right time or place because they include information based on time or location. For example, when you arrive at the airport, you...

An Objective-C class defines an object that combines data with related behavior. Sometimes, it makes sense just to represent a single task or unit of behavior, rather than a collection of methods. Blocks are a language-level feature added to C, Objective-C and C++, which allow you to create distinct segments of code that can be passed around to methods or functions as if they were values. Blocks are Objective-C objects, which means they can be added to collections like  NSArray  or  NSDictionary . They also have the ability to capture values from the enclosing scope, making them similar to  closures  or  lambdas  in other programming languages. This chapter explains the syntax to declare and refer to blocks, and shows how to use blocks to simplify common tasks such as collection enumeration. For further information, see  Blocks Programming Topics . Here is the apple reference:  https://developer.apple.com/library/content/docu...