By Erica Sadun, Rich Wardwell
This publication brings jointly trustworthy, confirmed strategies for the center of day by day iOS 7 improvement. well known iOS programming professional Erica Sadun and most sensible iOS developer wealthy Wardwell conceal all you must create winning iOS 7 cellular apps with average APIs and interface parts and take complete benefit of iOS 7 photographs, touches, and views.
As in all of Sadun's iOS bestsellers, The center iOS Developer's Cookbook interprets smooth top practices into operating code, distilling key options into concise recipes you could simply comprehend and practice on your personal initiatives. This isn't simply cut-and-paste; utilizing examples, Sadun and Wardwell absolutely clarify either the "how" and "why" of powerful iOS 7 improvement.
Read or Download The Core iOS Developer's Cookbook (5th Edition) PDF
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Additional resources for The Core iOS Developer's Cookbook (5th Edition)
Instead of issuing iterative offset vectors, UIPanGestureRecognizer returns a single vector representing a translation in terms of some view’s coordinate system, typically the coordinate system of the manipulated view’s superview. This vector translation lends itself to simple affine transform calculations and can be mathematically combined with other changes to produce a unified transform representing all changes applied simultaneously. transform = theTransform; } Notice how the recognizer checks for the end of interaction and then updates the view’s position and resets the transform’s translation.
Com/erica/ iOS-7-Cookbook and go to the folder for Chapter 1. info 25 26 Chapter 1 Gestures and Touches Recipe: Using Multi-Touch Interaction Enabling Multi-Touch interaction in UIView instances lets iOS recover and respond to more than one finger touch at a time. Set the UIView property multipleTouchEnabled to YES or override isMultipleTouchEnabled for your view. When enabled, each touch callback returns an entire set of touches. When that set’s count exceeds 1, you know you’re dealing with Multi-Touch.
The second question, converting a swipe into a drag, is addressed by thinking about the entire touch lifetime. Each touch that creates a new object starts as a directional drag but ends up as a pan once the new view is created. A pan recognizer works better here than a swipe recognizer, whose lifetime ends at the point of recognition. To make this happen, Recipe 1-12 manually adds that directional-movement detection, outside the built-in gesture detection. In the end, that working-outside-the-box approach provides a major coding win.