- Quartzcode use relative frame how to#
- Quartzcode use relative frame full#
- Quartzcode use relative frame code#
We will be adding our component into this group. Set the project name to “QuartzTest” and click “Save”.ĤIn the opened window, in the “Groups & Files” outline section, expand the “Classes” group. Now that we know what we know what we want, it’s time to start creating our Xcode project:ġOpen XCode (Type “xcode” in spotlight and it will be your top hit).ĢGoto “File” and click on “New Project…” (Default shortcut “command-shift-n”)ģIn the opened “New Project” dialog, in the iOS Application section, select “View-based Application”.
Quartzcode use relative frame full#
eg: we might want to use this component to display health in a game, so when the player has low health it will be red and when has full health it will be green. We want to be able to change it’s value and colour during our application execution. We want to be able to set it’s colour to whatever we want.
Quartzcode use relative frame code#
We want the code to be easily understandable (because this is a tutorial after all), so we add many comments. We also want it to be easy to use and re-usable, or in other words a “component”. So it takes a value between 0 and 1 and displays it. We need a circular shape showing percentage of something. QuartzTest.zip Circular Progress View Project:įirst we need to think about what we want (simple use-cases): If you are a beginner, I recommend you work through the tutorial steps instead of simply downloading the project and reading through it. Here is the final project that we will create at the end of this tutorial. We will use CGContext objects in our code… Final sample code The programming equivalent of “paint canvas” in Quartz is called “ CGContext“. UIKit uses Quartz to draw onto the screen. 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.
Quartzcode use relative frame how to#
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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