yjzalbumcollectionviewlayout's Introduction

YJZAlbumCollectionViewLayout

YJZAlbumCollectionViewLayout is a UICollectionViewLayout subclass, used as the layout object of UICollectionView.

The idea of YJZAlbumCollectionViewLayout is inspired by RFQuiltLayout. The purpose of it is to allow users to create their desired collection layouts simply and straightforward.

Default	Custom

How to use

Add the layout as the subclass of your UICollectionViewLayout.

The following code is to create the above custom collection layout

- (void) viewDidLoad {
  // ...

  YJZAlbumCollectionViewLayout* layout = (id)[self.collectionView collectionViewLayout];

  [layout clearLayout];
  [layout addLayoutWithRowWidth:320.f rowHeight:100.f layouts:@[[NSValue valueWithCGRect:CGRectMake(0.f, 0.f, 80.f, 100.f)],[NSValue valueWithCGRect:CGRectMake(80.f, 0.f, 80.f, 100.f)],[NSValue valueWithCGRect:CGRectMake(160.f, 0.f, 80.f, 100.f)],[NSValue valueWithCGRect:CGRectMake(240.f, 0.f, 80.f, 100.f)]]];

  [layout addLayoutWithRowWidth:320.f rowHeight:100.f layouts:@[[NSValue valueWithCGRect:CGRectMake(0.f, 0.f, 160.f, 100.f)],[NSValue valueWithCGRect:CGRectMake(160.f, 0.f, 80.f, 50.f)],[NSValue valueWithCGRect:CGRectMake(240.f, 0.f, 80.f, 50.f)],[NSValue valueWithCGRect:CGRectMake(160.f, 50.f, 80.f, 50.f)],[NSValue valueWithCGRect:CGRectMake(240.f, 50.f, 80.f, 50.f)]]];

  layout.delegate = self;

  // ... 
}

- (UIEdgeInsets) insetsForItemAtIndexPath:(NSIndexPath *)indexPath {
  return UIEdgeInsetsMake(2.f, 2.f, 2.f, 2.f);
}

(Note: all delegate methods are optional)

API

All api methods must be called before prepareLayout is called.

// add a custom row layout
- (void) addLayoutWithRowWidth:(CGFloat) rowWidth rowHeight:(CGFloat) rowHeight layouts:(NSArray*) layouts;
//clear all current layouts
- (void) clearLayout;

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