By Matt Neuburg
If you’re grounded within the fundamentals of rapid, Xcode, and the Cocoa framework, this publication presents a established rationalization of all crucial real-world iOS app elements. via deep exploration and copious code examples, you’ll easy methods to create perspectives, manage view controllers, and upload positive factors from iOS frameworks. All instance code is offered on GitHub so you might obtain, examine, and run. Create, manage, draw, layer, and animate perspectives that reply to contact Use view controllers to control a number of interface monitors grasp interface periods for scroll perspectives, desk perspectives, textual content, popovers, cut up perspectives, net perspectives, and controls Dive into frameworks for sound, video, maps, and sensors entry person libraries: tune, photographs, contacts, and calendar comprehend extra subject matters, together with documents, networking, and threads
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Additional resources for Programming iOS 10 Dive Deep into Views, View Controllers, and Frameworks
A view might respond to a change in its surrounding views. For example, when a navigation bar is shown or hidden dynamically, the remaining interface might shrink or grow to compensate, filling the available space. • The user might alter the width of your app’s window on an iPad, as part of the iPad multitasking interface. In any of those situations, and others, layout will probably be needed. Layout is performed in three primary ways: Manual layout The superview is sent the layoutSubviews message whenever it is resized; so, to lay out subviews manually, provide your own subclass and override layout24 | Chapter 1: Views Subviews.
A fourth basic transform type, skewing or shearing, has no initializer. identity, the iden‐ tity transform. It has no visible effect, so you’re unaware of it. Any transform that you do apply takes place around the view’s center, which is held constant. Here’s some code to illustrate use of a transform: Transform | 17 Figure 1-6. frame) The transform property of the view v1 is set to a rotation transform. The result (Figure 1-6) is that the view appears to be rocked 45 degrees clockwise. ) Observe that the view’s center property is unaffected, so that the rotation seems to have occurred around the view’s center.
A subview exactly covering its superview superview will change the apparent position of a subview. y += 10 Nothing happens to the superview’s size or position. But the subview has moved up and to the left so that it is flush with its superview’s top-left corner (Figure 1-5). 0), the subview now touches the superview’s top-left corner. The effect of changing a view’s bounds origin may seem directionally backward — we increased the superview’s origin in the positive direction, but the subview moved in the negative direction — but think of it this way: a view’s bounds origin point coin‐ cides with its frame’s top left.