By Erica Sadun
Apple lavished iOS with a wealthy and evolving library of resolution-independent second drawing utilities. Its APIs comprise strong good points resembling transparency, path-based drawing, anti-aliasing, and extra. Harness those low-level, light-weight drawing exercises on your apps to construct pictures, to create PDFs, to show perspectives, and to print.
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Additional info for iOS Drawing Practical UIKit Solutions
CGAffineTransform—Affine transform structures describe changes applied to a geometric item—specifically, how an item is placed, scaled, and rotated. They store the a, b, c, d, tx, and ty values in a matrix that defines a particular transform. The next sections introduce these items in more depth. You need to have a working knowledge of these geometric basics before you dive into the specifics of drawing. Points The CGPoint structure stores a logical position, which you define by assigning values to the x and y fields.
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. CGPath); CGContextClip(context); // Perform clipped drawing here // Restore the state CGContextRestoreGState(context); // Drawing done here is not clipped Transforms The sequence of letters in Figure 1-13 is built by drawing each character at points around a circle.
UIKit classes continue evolving. With each generation of iOS, they provide more and more resources that enable you to skip direct Quartz. UIKit APIs offer the advantages of simplicity, parsimony, and ease of inspection. Most iOS developers will find that these advantages create a powerful case for primarily using UIKit. Apple generally advises developers to work with the highest-level API possible. Use lower-level APIs when you need functionality that higher-level versions do not provide. There are numerous things you can do in the older-style APIs that you simply cannot do in UIKit, such as painting with calculated shadows or working with output color spaces.