A tiny category on UIView that allows you to set one property: "parallaxIntensity" to achieve a parallax effect with UIMotionEffect

Last update: Sep 26, 2022

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Overview

NGAParallaxMotion

A tiny category on UIView that allows you to set one property: parallaxIntensity to achieve a parallax effect with UIMotionEffect.

Show the parallax effect in one line

theView.parallaxIntensity = 10;

Positive values make the view appear to extend from the screen. Negative values make the view appear to recess behind the screen.

Interface Builder

Additionally, you can set this property within Interface Builder by editing the "User Defined Runtime Attributes" and adding:

KeyPath           |  Type  | Value
----------------------------------------------
parallaxIntensity | Number |  your depth value

Examples

On

Off

License

This code is under the MIT license.

Release Notes

1.1

Added new direction constraints (Thanks @arunaharsa!)

1.0

Initial Release

Comments

Cannot run in iOS 6 Simulator

I assumed that this category would degrade more gracefully if running on iOS 6, but I'm unable to run at all. I'm getting the following error:

dyld: Symbol not found: OBJC_CLASS$_UIInterpolatingMotionEffect Referenced from: /Users/RichardGuy/Library/Application Support/iPhone Simulator/6.0/Applications/19E194FD-988A-4499-9EB1-A559989359C9/Nibblr.app/Nibblr Expected in: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/System/Library/Frameworks/UIKit.framework/UIKit in /Users/RichardGuy/Library/Application Support/iPhone Simulator/6.0/Applications/19E194FD-988A-4499-9EB1-A559989359C9/Nibblr.app/Nibblr (lldb)

opened by objectmethod 22
Added MWInterpollationMotionEffect

Hi,

I've added my MWInterpollationMotionEffect to your category, it can be set with positive and also negative values, so in the demo which I've updated, the background is moving in opposite direction to the labels.

opened by Przytua 8
nga_parallaxMotionEffectGroup getter responsible for instantiation

Hello, this is a great category, thanks for releasing :smile_cat:

I thought it would be cleaner if the getter function was responsible for ensuring a valid UIMotionEffectGroup is returned. Open to feedback if this pull req doesn't meet your standards.

opened by zmcartor 5
removing strong references from project example

strong references from a view to its subviews causes a retain cycle @see https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmPractical.html @see http://www.cocoawithlove.com/2009/07/rules-to-avoid-retain-cycles.html

opened by riosc 0
Stop / Start effect feature
Currently the parallax effect is stopped by setting the intensity at a 0.0 value. I think this should be great to add start/stop command. Moreover it solve in an elegant way the mistake describe hereafter.

Test for intensity is highly incorrect as it use equality between float value: chances are great that the condition will never be true.

if (parallaxDepth == 0.0)

In such case the usage is to use a delta value and change the test to:

if (parallaxDepth < delta)

As Objective-C is not my main language maybe there is no problem at all to use the equality test on float type. But teachers and professional experience show me this was wrong.

Finally, thank for this useful and pretty piece of code !
opened by ghost 1
`parallaxIntensity` as a name could use improvement
"Intensity" as a name is a bit vague and it's not clear if an "intensity" can be negative ( though the value of this variable certainly can be).

Suggestions:

parallaxDisplacement

parallaxAmount

parallaxOffset

parallaxAdjustment

parallaxLevel

parallaxPlane

I'm open to suggestions.
opened by michaeljbishop 3

Owner

Michael Bishop

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