Swift 4 – A Step Ahead to The Most Advanced Programming Language – iOS Development

Hey, welcome back!!! Let’s move one step ahead with the open source development language from Swift 3 to Swift 4. We, at 9series, have filtered out points of our next strides in developing mobile apps using Swift 4.

Swift 4

Swift 4 is the latest major release for iOS App Developer that is intended to be completed in the fall of 2017. Its main focus is to provide source compatibility with Swift 3 code while implementing essential feature work that needs to achieve binary stability in the language. It will contain valuable enhancements to the core language and Standard Library, particularly in the generics system and an overhaul of the String type.

Source Compatibility Modes

The Swift 4 compiler will provide two language modes: Swift version 3 and Swift version 4. Swift 3 established the language for source-level stability and now Swift 4 releases source compatibility as a feature moving ahead.

    • Swift 3 mode is default for existing code and will build source code that works with the Swift 3 compiler
    • Swift 4 mode allows you to use new features and performance optimizations of Swift 4, some of which may require migration
    • Mixed mode allows you to take advantage of interoperability between binaries built with the same compiler. The proposed design is that a project containing various Swift modules, such as a Xcode project with multiple Swift targets, will be able to ratify into the specific Swift language mode on per module (target) level and that they can smoothly interact within the same compiled binary.

New Features in Swift 4

    • Swift 4 presents another codable protocol that gives a chance to serialize and deserialize custom data types without composing any special code – and without worrying about losing your value types
    • Quicker and simpler to use strings that retain Unicode correctness and add support for using, creating and managing substrings
    • Smart key paths for type-safe, effective and extensible key value coding for Swift types
    • Enhancements to create and manipulate Dictionary and Set types

Swift has many other features to make your code more expressive:

Multi-Line String Literals

To start a string literal, you need to write three double quotation marks: “”” then press return. After pressing return key, start writing strings with any variables, line breaks and double quotes. To end multi line string literal again write ””” in new line. Ex:-

1

Strings are Collections

Just like in earlier version of Swift, Strings can be handled as a collection. No need to writestring.characters.something to perform string manipulation.

2

Dictionary Functionality has Improved

Swift 4 combines some additional functionality to dictionaries to make them more strong, and also to make them work more like you would expect. Let’s start with a simple example: Modifying dictionaries in Swift 3 does not return a new dictionary. Instead, it returns an array of tuples with key/value labels.

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After that code runs you can’t read distinction[“Maths”] because it is no longer a dictionary. Instead, you need to use distinction[0].value, which is not good for us because we apply filter on dictionary and we got an array.

As of Swift 4, this acts more like you would expect: you get back a latest dictionary. Obviously this will break any existing code that relies on the array return type.

Similarly, the map() method on dictionaries got a key-value tuple passed in, and could return a single value to be added to an array.

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That has not changed in Swift 4, but there is a new method called mapValues(). It allows you to modify the values and place them back into a dictionary using the original keys.

Here we try to form different buckets where each bucket will contain values having same first character in their name. For Example:-.

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It’s now likely to obtain a dictionary key and provide a default value to use if the key is missing. In following statement if there is no value for key “Bio” found then it will print default value.

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Built in Encoding and Decoding

Swift 4 appears with built-in encoders and decoders for JSON. JSON to Model conversion comes in built in.

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One Sided Range

Swift 4 introduces Python-like one-sided collection slicing, where the missing side is automatically assumed to be the start or end of the collection.

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Conclusion

Like with other Swift releases, 4.0 was announced at WWDC ’17 and released in beta form for developers alongside Xcode 9. This release of Swift added quite a few refinements and features to the programming language. First release of Swift 4.0 will bring overall stability to the source and binary interface, or ABI.

iPhone Application Development and Myths

Whether you want to connect with millions of tech-minded people across the world or want to approach customers, whether you want to get recognized quickly or you want to promote your business, whether you want to reach your customers globally or want them to gain access to your products and services easily, you can do all these things in the most effective and efficient manner by getting a mobile application developed for your business.

In this app era, where each entrepreneur has an application for his business, you should not lack behind. Get an iPhone application built to walk ahead of your competitors. As part of individuals getting an iPhone application manufactured each day, many people are planning to get into this field, foreseeing and daydreaming their career into the iPhone application development.

Irrespective of the innumerable benefits of an iPhone app for your business, there are parcel of myths that go as one with regards to the iOS application development. We ought to put every one of the endeavors to get these misguided judgments out of this world so that people are aware of the iPhone application development facts; they have got all the rights to know the truth! In this way, here we would talk about the absolute most well-known misinterpretations about the iPhone application development prevailing in the app market so that we can endeavour together to eradicate them.

Here we go…

  1. iOS application development is similar to the desktop application

There are lot of people who say or believe that iPad app or iPhone app development is almost same as desktop development rather than the web development. Well, this is indeed a myth! There is no connection between the iOS app development and desktop development. The utilization conditions are completely diverse. Not only that but also lot many other things are different.

  1. It is difficult to learn working on the iOS platform.

This can be considered as one of the most popular myth prevailing in the app market. Well, neither it is time taking, nor it is difficult to learn programming for working on the iOS platform. In fact, Apple has made extremely easy for developers to work on the applications.

  1. You must know C to learn Objective-C

Obviously, it is useful to the engineers on the off chance that they know C language, but that doesn’t mean they cannot learn Objective-C from the scratch if they don’t know C language.

  1. It is impractical to present an iPhone application to the Apple application store in under two weeks

Although the fact is, it takes at least two to three weeks to submit an iPhone application to the Apple app store; that does not mean in any case that, it is impossible to make the submission sooner in case of emergencies. If it is extremely important for a developer or a company to release the app in two to three days, it can be done using the special form available at the official Apple website.

Now that you are aware of the misconceptions about the iPhone application development, it is advisable for you to try to get rid of them and help people dig out the truth!