April 2015
Intermediate to advanced
556 pages
17h 47m
English
book
Cocoa Programming for OS X: The Big Nerd Ranch Guide
by Aaron Hillegass, Adam Preble, Nate Chandler
Content preview from Cocoa Programming for OS X: The Big Nerd Ranch Guide
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For the More Curious: Dirty Rects
As mentioned previously, the NSRect that is passed as an argument to the view is the region that is “dirty” and needs redrawing. It may be less than the entire view. If you are doing very time-consuming drawing, redrawing only the dirty rectangle may speed up your application considerably.
Note that setting needsDisplay to true
will trigger the entire visible region of the view to be redrawn.
If you wanted to be more precise about which part of the view needs redrawing,
you would use setNeedsDisplayInRect(_:) instead:
let dirtyRect = NSRect(x: 0, y: 0, width: 50, height: 50) myView.setNeedsDisplayInRect(dirtyRect)
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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