By Erica Sadun
Apple lavished iOS with a wealthy and evolving library of resolution-independent second drawing utilities. Its APIs contain strong positive factors comparable to transparency, path-based drawing, anti-aliasing, and extra. Harness those low-level, light-weight drawing workouts on your apps to construct photographs, to create PDFs, to demonstrate perspectives, and to print.
In this consultant, Erica Sadun, bestselling writer of The middle iOS 6 Developer's Cookbook and The complex iOS 6 Developer's Cookbook, is helping readers discover iOS drawing via an abundance of examples along lots of causes and assistance. This brief paintings presents the elemental how-to builders have to start.
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You modify a context by overlaying new drawing operations. Listing 1-8 demonstrates this model. Its code builds two circular Bezier paths. It draws the left one in purple, then the right one in green. Figure 1-6 shows the result. The green circle overlaps and obscures part of the original purple drawing. info Figure 1-6 The green circle is drawn after the purple one, covering up part of that original drawing. Note The sample code in this chapter refers to two UIColor instance variables called greenColor and purpleColor.
Com/296-arc-gotcha-unexpectedly-short-lifetimes. To move back to UIKit from Quartz, use the class constructor method. This builds a UIKit instance from the Core Graphics object reference: UIColor *color = [UIColor colorWithCGColor:myCGColorRef]; Note Take care when using the CGColor property of UIColor instances. ARC may assume you won’t use the UIKit color any further after you assign CGColor to a variable. This can raise an exception. Always retain and release Core Graphics properties you assign to variables, even if you extract them from UIKit objects.
3. When clipped, perform any standard drawing operations. Material drawn outside the bounds of the clipping path is automatically discarded on your behalf. 4. To finish, restore the graphic state. This allows you to resume normal drawing without any further clipping, returning the context to the state before you began clipped operations. This process amounts to saving, clipping, drawing, and restoring. ) Chapter 6 introduces ways to use Objective-C blocks to clip and draw within saved-and-restored graphics states rather than managing those states through explicit calls.