#QUARTZCODE USE RELATIVE FRAME HOW TO#
#QUARTZCODE USE RELATIVE FRAME FULL#
#QUARTZCODE USE RELATIVE FRAME CODE#

Set the project name to вЂњQuartzTestвЂќ and click вЂњSaveвЂќ.Д¤In the opened window, in the вЂњGroups & FilesвЂќ outline section, expand the вЂњClassesвЂќ group. Now that we know what we know what we want, itвЂ™s time to start creating our Xcode project:ДЎOpen XCode (Type вЂњxcodeвЂќ in spotlight and it will be your top hit).ДўGoto вЂњFileвЂќ and click on вЂњNew ProjectвЂ¦вЂќ (Default shortcut вЂњcommand-shift-nвЂќ)ДЈIn the opened вЂњNew ProjectвЂќ dialog, in the iOS Application section, select вЂњView-based ApplicationвЂќ.

#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 itвЂ™s value and colour during our application execution. We want to be able to set itвЂ™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 вЂњcomponentвЂќ. 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:ДЇirst 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 codeвЂ¦ Final sample code The programming equivalent of вЂњpaint canvasвЂќ in Quartz is called вЂњ CGContextвЂњ. UIKit uses Quartz to draw onto the screen. Whenever something changes, UIKit paints the screen again. When using UIKit, items are вЂњpaintedвЂќ 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 youвЂ™re working on a MacOS project this tutorial can still be useful for you. IвЂ™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 donвЂ™t let the words вЂњadvancedвЂќ 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. вЂњ Quartz 2D is an advanced, two-dimensional drawing engine available for iOS application developmentвЂ¦вЂњ.

Quartzcode use relative frame