Whenever something changes, UIKit paints the screen again. When using UIKit, items are “painted” onto the screen once. If you imagine the device screen as a paint canvas, you will understand how graphic libraries work. ![]() Our objective is to create a circular progress bar (view), we will be using the following Quartz features: path-based drawing, image clipping and radial gradients. Our sample project will be on the iPhone and will use the iOS SDK, but the Quartz code is the same in MacOS, so even if you’re working on a MacOS project this tutorial can still be useful for you. I’ve written this tutorial in a way that benefits beginners by starting from the very beginning and going all the way to the end However people who are only looking for good examples can just jump straight to Step 5 of the tutorial. In this tutorial I plan to show you how to start working with Quartz, I will provide sample code and explanations. Now don’t let the words “advanced” fool you, Quartz is actually pretty easy to work with, while at the same time very powerful. What this means is: you use it to draw stuff. ![]() ![]() “ Quartz 2D is an advanced, two-dimensional drawing engine available for iOS application development…“.
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