iOS Circular Collection View Layout

Circular Collection View Layout for iOS layouts the collectionview items in a circular patterns.
You can customise the angle of the circle to be visible. Check out set up for customization

Features

Universal device support (iPhone + iPad)
Easily stylable
Nice set of configuration options
Lightweight, simple and readable code.

Installation

Cocoa pods

DSCircularCollectionView is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "DSCircularCollectionView"

Manual Installation

Download the zip
Add the files under DSCircularCollectionView into your project.

Added insert and remove animations. Download sample to check the animations.

Setup

Theory

Basic

DSCircularLayout *circularLayout = [[DSCircularLayout alloc] init];
[circularLayout initWithCentre:CGPointMake(160, 160)
radius:120
itemSize:CGSizeMake(50, 50)
andAngularSpacing:20];
[circularLayout setStartAngle:M_PI endAngle:0];
circularLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
[collectionView setCollectionViewLayout:circularLayout];

Init the DSCircularLayout object with centre of the circle, radius of the circle, item size and spacing between each collection view cell
Set the visible angle in the circle with start and end angle. specify startAngle to endAndle in clock wise. (Default M_PI to 0)
Set the scrollDirection to UICollectionViewScrollDirectionHorizontal/Vertical (Default Vertical)

Advanced

@property (nonatomic, assign) UICollectionViewScrollDirection scrollDirection;

@property (nonatomic, assign) BOOL mirrorX;

@property (nonatomic, assign) BOOL mirrorY;

@property (nonatomic, assign) BOOL rotateItems;

- rotateItems (Default : NO)

Enabling this to YES, will rotate items based on the angle where they are in the circle.

- scrollDirection

Based on the angle of visibility choose the scroll direction (Horizintal or Vertical). For a visibility angle between M_PI to 0 horizontal scroll works, where as for M_PI/2 to 3M_PI.2 vertical scroll works. So choose scrollDirection wisely

- mirrorX, mirrorY (Default : NO)

For a particular visibility angle(b/w start and end), it so happens that the scrolling behaves reverse. That is, the layout will scroll in the opposite direction to the user scroll. Supporting this odd begaviour would be too much of code with angles.

The best way is to find alternate visible angle and mirror it.

Reverse Scroll	Proper Scroll
`[circularLayout setStartAngle:2*M_PI endAngle:M_PI]; circularLayout.mirrorX = NO; circularLayout.mirrorY = NO;`	`[circularLayout setStartAngle:M_PI endAngle:0]; circularLayout.mirrorX = NO; circularLayout.mirrorY = YES;`

Example

To run the example project, clone the repo, and run pod install from the Example directory first

Author

Dodda Srinivasan, srinivasan.munna@gmail.com

License

DSCircularCollectionView is available under the MIT license. See the LICENSE file for more info.

DoddaSrinivasan / DSCircularCollectionView

readme