By Matt Neuburg
If you’re grounded within the fundamentals of speedy, Xcode, and the Cocoa framework, this e-book offers a based rationalization of all crucial real-world iOS app elements. via deep exploration and copious code examples, you’ll the way to create perspectives, manage view controllers, and upload gains from iOS frameworks.
Stay up to date on iOS nine thoughts, corresponding to the hot format constraint notation, accelerated UIKit dynamics, revised unwind segues, iPad multitasking, and the Contacts framework. All instance code is accessible on GitHub that you should obtain, examine, and run.
• Create, organize, draw, layer, and animate perspectives that reply to touch
• Use view controllers to regulate a number of interface screens
• grasp interface sessions for scroll perspectives, desk perspectives, textual content, popovers, break up perspectives, internet perspectives, and controls
• Dive into frameworks for sound, video, maps, and sensors
• entry person libraries: track, images, contacts, and calendar
• comprehend extra subject matters, together with documents, networking, and threads
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Additional info for Programming iOS 9: Dive Deep into Views, View Controllers, and Frameworks
Springs and struts can be assigned internally or exter‐ nally, horizontally or vertically. Thus you can specify (using internal springs and struts) whether and how the view can be resized, and (using external springs and struts) whether and how the view can be repositioned. For example: • Imagine a subview that is centered in its superview and is to stay centered, but is to resize itself as the superview is resized. It would have struts externally and springs internally. • Imagine a subview that is centered in its superview and is to stay centered, and is not to resize itself as the superview is resized.
Before autolayout, the way to achieve more sophisticated goals of that sort was to combine autoresizing with manual layout in layoutSubviews. Autoresizing happens before layoutSubviews is called, so your layoutSubviews code is free to come marching in and tidy up whatever autoresizing didn’t get quite right. Nowadays, though, autolayout is the norm. 28 | Chapter 1: Views Autolayout Autolayout is an opt-in technology, at the level of each individual view. A view may opt in to autolayout in any of three ways: • Your code adds an autolayout constraint to a view.
Autolayout is implemented behind the scenes in layoutSubviews; in effect, constraints allow you to write sophisticated layoutSubviews functionality without code. Your layout strategy can involve any combination of these. The need for manual layout is rare, but it’s there if you need it. Autoresizing is used automatically unless you delib‐ erately turn it off by setting a superview’s autoresizesSubviews property to false, or unless a view uses autolayout instead. Autolayout is an opt-in technology, and can be used for whatever areas of your interface you find appropriate; a view that uses auto‐ layout can live side by side with a view that uses autoresizing.