By Matt Neuburg
Movement into iOS improvement by means of getting a company clutch of its basics, together with the Xcode IDE, the Cocoa contact framework, and speedy 2.0—the newest model of Apple's acclaimed programming language. With this completely up-to-date consultant, you'll examine Swift’s object-oriented options, know how to exploit Apple's improvement instruments, and realize how Cocoa presents the underlying performance iOS apps have to have.
• discover Swift’s object-oriented thoughts: variables and services, scopes and namespaces, item varieties and instances
• get to grips with integrated fast kinds equivalent to numbers, strings, levels, tuples, Optionals, arrays, dictionaries, and sets
• methods to claim, instantiate, and customise rapid item types—enums, structs, and classes
• observe strong quick gains similar to protocols and generics
• make amends for quick 2.0 strategies: choice units, protocol extensions, blunders dealing with, safeguard statements, availability exams, and more
• travel the lifecycle of an Xcode venture from inception to App Store
• Create app interfaces with nibs and the nib editor, Interface Builder
• comprehend Cocoa’s event-driven version and its significant layout styles and features
• learn how speedy communicates with Cocoa’s C and Objective-C APIs
Once you grasp the basics, you'll manage to take on the main points of iOS app improvement with writer Matt Neuburg's spouse consultant, Programming iOS 9.
Read Online or Download iOS 9 Programming Fundamentals with Swift: Swift, Xcode, and Cocoa Basics PDF
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Additional info for iOS 9 Programming Fundamentals with Swift: Swift, Xcode, and Cocoa Basics
Example text
Name appears in a Dog instance method’s code, it means the name of this Dog instance, the one whose code is running at that moment. It turns out that every use of the word self I’ve just illustrated is completely optional. You can omit it and all the same things will happen: class Dog { var name = "" var whatADogSays = "woof" func bark() { print(whatADogSays) self | 19 } func speak() { bark() } } The reason is that if you omit the message recipient and the message you’re sending can be sent to self, the compiler supplies self as the message’s recipient under the hood.
Thus, for example, these two functions can coexist: func say (what:String) { } func say (what:Int) { } The reason overloading works is that Swift has strict typing. A String is not an Int. Swift can tell them apart in the declaration, and Swift can tell them apart in a function call. Thus, Swift knows unambiguously that say("what") is different from say(1). Overloading works for the return type as well. Two functions with the same name and parameter types can have different return types. But the context of the call must dis‐ ambiguate; that is, it must be clear what return type the caller is expecting.
Methods and properties of object types — in particular, instance methods and instance properties — will be where most of the action is. Object types give each actual instance its speci‐ alized abilities. They also help to organize your program’s code meaningfully and main‐ tainably. We may summarize the nature of objects in two phrases: encapsulation of functionality, and maintenance of state. ) Encapsulation of functionality Each object does its own job, and presents to the rest of the world — to other objects, and indeed in a sense to the programmer — an opaque wall whose only entrances are the methods to which it promises to respond and the actions it promises to perform when the corresponding messages are sent to it.