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Download Learning Swift (2nd Edition) by Andrew J. Wagner PDF

By Andrew J. Wagner

Develop the abilities required to create compelling, maintainable, and powerful iOS and OS X apps with Swift

About This Book
• Write expressive, comprehensible, and maintainable quick 2 code with this hands-on tutorial
• Unveil the complicated underpinnings of rapid to show your app principles into reality
• This e-book is full of real-life examples that can assist you enforce ideas as you learn

Who This e-book Is For
If you're looking to construct iOS or OS X apps utilizing the main glossy expertise, this e-book is perfect for you. you'll find this booklet particularly invaluable while you're new to programming or while you're but to enhance for iOS or OS X. No past programming publicity is required.

What you'll Learn
• shape a fantastic realizing of the fast 2 language
• Get to grasp the sensible elements of the way a working laptop or computer application truly works
• comprehend the paradigms utilized by Apple's frameworks so that you usually are not intimidated via them
• make the most of the significant assets written in Objective-C to raised tell your fast programming
• improve a simple portfolio of rapid code by way of studying the serious concepts
• adventure either object-oriented and practical programming
• Get to grasp the recent coding ideas made on hand by way of fast 2
• notice assets to make sure you by no means cease turning into a greater developer

In Detail
Swift is Apple's new programming language and the way forward for iOS and OS X app improvement. it's a high-performance language that sounds like a contemporary scripting language. at the floor, rapid is straightforward to leap into, however it has advanced underpinnings which are severe to changing into informed at turning an idea into reality.

This booklet is an approachable, step by step advent into programming with quick for everybody. It starts off by means of supplying you with an outline of the most important positive aspects via sensible examples and progresses to extra complicated themes that aid differentiate the trained builders from the mediocre ones. It covers vital thoughts resembling Variables, Optionals, Closures, Generics, and reminiscence administration. jumbled in with these thoughts, it additionally is helping you study the paintings of programming resembling maintainability, precious layout styles, and assets to additional your wisdom. This all culminates in writing a uncomplicated iOS app that would get you good in your approach to turning your individual app rules into reality.

Style and approach
This is an approachable, step by step consultant to programming in quick 2. every one subject is separated into compressible sections which are packed with useful examples and easy-to-understand factors. each one part builds at the past themes so that you can advance a trained and entire realizing of app improvement in quick 2.

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Additional resources for Learning Swift (2nd Edition)

Example text

The canvas internally tracks the current location, but you will modify it with your drawing routines. Once the shape is begun, you can use a variety of functions on the context to plot the layout of your shape. You’ve already seen the simplest context pathing functions in action: • moveTo(x, y): moves the current location to a new destination of (x, y) without drawing. • lineTo(x, y): moves the current location to a new destination of (x, y) drawing a straight line from the current position to the new one.

There are other ways to produce movement on a web page—CSS animations come to mind—but if you are working with script-based changes, the requestAnimationFrame function is the way to go. Summary As you can see, the Canvas API provides a very powerful way to modify the appearance of your web application without resorting to odd document hacks. Images, gradients, and complex paths can be combined to create nearly any type of display you may be looking to present. Keep in mind that you generally need to draw at the origin, load any images you want to display before attempting to draw them, and be mindful of tainting your canvas with foreign image sources.

As with other color values, it is possible to supply an alpha (for example, transparency) value as part of the color and make that alpha value transition as well. To do so, you will need to use another textual representation of the color value, such as the CSS rgba function that includes an alpha component. Let’s see this in more detail with a code sample that applies two gradients to a fillRect representing our final tree trunk, as shown in Listing 2-16. Listing 2-16. 5)'); // Slightly further down, the gradient completely fades to // fully transparent.

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