IOS 自定义UICollectionView的头视图或者尾视图UICollectionReusableView

ios 自定义uicollectionview的头视图或者尾视图uicollectionreusableview

其实看标题就知道是需要继承于uicollectionreusableview,实现一个满足自己需求的视图.那么如何操作了,看下面代码:

viewcontroller.m文件中

#import "viewcontroller.h"
#import "lshcontrol.h"
#import "shcollectionreusableview.h"
#import "shcollectionviewcell.h"

#define shcollectionviewcellidetifiler  @"collectionviewcell"
#define shcollectionreusableviewheader  @"collectionheader"
#define shcollectionreusableviewfooter  @"collectionfooter"

@interface viewcontroller ()<uicollectionviewdelegate,uicollectionviewdatasource>{
  nsarray *recipeimages;
  nsarray *heardertitlearray;
}


@property(nonatomic,strong) uicollectionview *rightcollectionview;

@end

@implementation viewcontroller

- (void)viewdidload {

  [super viewdidload];

  nsarray *maindishimages = [nsarray arraywithobjects:@"egg_benedict.jpg", @"full_breakfast.jpg", @"ham_and_cheese_panini.jpg", @"ham_and_egg_sandwich.jpg", @"hamburger.jpg", @"instant_noodle_with_egg.jpg", @"japanese_noodle_with_pork.jpg", @"mushroom_risotto.jpg", @"noodle_with_bbq_pork.jpg", @"thai_shrimp_cake.jpg", @"vegetable_curry.jpg", nil];
  nsarray *drinkdessertimages = [nsarray arraywithobjects:@"angry_birds_cake.jpg", @"creme_brelee.jpg", @"green_tea.jpg", @"starbucks_coffee.jpg", @"white_chocolate_donut.jpg", nil];
  recipeimages = [nsarray arraywithobjects:maindishimages, drinkdessertimages, nil];

  heardertitlearray=@[@"分区1",@"分区2"];

  [self createcollectionview];

}

-(void)createcollectionview{

  uicollectionviewflowlayout *flowlayout=[[uicollectionviewflowlayout alloc] init];
  flowlayout.minimuminteritemspacing=0.f;//item左右间隔
  flowlayout.minimumlinespacing=5.f;//item上下间隔
  flowlayout.sectioninset=uiedgeinsetsmake(5,15,5, 15);//item对象上下左右的距离
  flowlayout.itemsize=cgsizemake(80, 80);//每一个 item 对象大小
  flowlayout.scrolldirection=uicollectionviewscrolldirectionvertical;//设置滚动方向,默认垂直方向.
  flowlayout.headerreferencesize=cgsizemake(self.view.frame.size.width, 30);//头视图的大小
  flowlayout.footerreferencesize=cgsizemake(self.view.frame.size.width, 30);//尾视图大小

  self.rightcollectionview= [lshcontrol createcollectionviewfromframe:self.view.frame collectionviewlayout:flowlayout datasource:self delegate:self backgroudcolor:[uicolor whitecolor]];

  //自定义重用视图
  [self.rightcollectionview registernib:[uinib nibwithnibname:@"shcollectionviewcell" bundle:nil] forcellwithreuseidentifier:shcollectionviewcellidetifiler];

  [self.rightcollectionview registerclass:[shcollectionreusableview class] forsupplementaryviewofkind:uicollectionelementkindsectionheader withreuseidentifier:shcollectionreusableviewheader];

  //使用原有重用视图
  [self.rightcollectionview registerclass:[uicollectionreusableview class] forsupplementaryviewofkind:uicollectionelementkindsectionfooter withreuseidentifier:shcollectionreusableviewfooter ];

  [self.view addsubview:self.rightcollectionview];

}

- (nsinteger)numberofsectionsincollectionview:(uicollectionview *)collectionview
{
  return [recipeimages count];
}

- (nsinteger)collectionview:(uicollectionview *)collectionview numberofitemsinsection:(nsinteger)section{
  return [[recipeimages objectatindex:section] count];
}

- (uicollectionreusableview *)collectionview:(uicollectionview *)collectionview viewforsupplementaryelementofkind:(nsstring *)kind atindexpath:(nsindexpath *)indexpath
{
  uicollectionreusableview *reusableview = nil;

  if (kind == uicollectionelementkindsectionheader) {

    shcollectionreusableview *headerview = [collectionview dequeuereusablesupplementaryviewofkind:uicollectionelementkindsectionheader withreuseidentifier:shcollectionreusableviewheader forindexpath:indexpath];
    /**
     *
     * 注意:虽然这里没有看到明显的initwithframe方法,但是在获取重用视图的时候,系统会自动调用initwithframe方法的.所以在initwithframe里面进行初始化操作,是没有问题的!
     */

    [headerview getshcollectionreusableviewheardertitle:heardertitlearray[indexpath.section]];

    reusableview = headerview;
  }

  if (kind == uicollectionelementkindsectionfooter) {

    uicollectionreusableview *footerview = [collectionview dequeuereusablesupplementaryviewofkind:uicollectionelementkindsectionfooter withreuseidentifier:shcollectionreusableviewfooter forindexpath:indexpath];
    /**
     *  如果头尾视图没什么很多内容,直接创建对应控件进行添加即可,无需自定义.
     */
    footerview.backgroundcolor=[uicolor redcolor];
    reusableview = footerview;
  }

  return reusableview;
}


- (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath{

  /**
   *
   *  这里自定义cell,使用xib进行布局.对于如何使用xib创建视图,不明白的,可以看我之前写的一篇文章.
   */


  shcollectionviewcell *cell = (shcollectionviewcell *)[collectionview dequeuereusablecellwithreuseidentifier:shcollectionviewcellidetifiler forindexpath:indexpath];

  uiimageview *recipeimageview = (uiimageview *)[cell viewwithtag:100];
  recipeimageview.image = [uiimage imagenamed:[recipeimages[indexpath.section] objectatindex:indexpath.row]];
  cell.backgroundview = [[uiimageview alloc] initwithimage:[uiimage imagenamed:@"photo-frame-2.png"]];

  return cell;
}

@end

自定义uicollectionviewcell,使用 xib进行布局

#import <uikit/uikit.h>

@interface shcollectionviewcell : uicollectionviewcell

@property (weak, nonatomic) iboutlet uiimageview *recipeimageview;

@end

#import "shcollectionviewcell.h"
@implementation shcollectionviewcell


@end

自定义uicollectionreusableview,手写代码进行布局

#import <uikit/uikit.h>

@interface shcollectionreusableview : uicollectionreusableview

/**
 *  声明相应的数据模型属性,进行赋值操作,获取头视图或尾视图需要的数据.或者提供一个方法获取需要的数据.
 */

-(void)getshcollectionreusableviewheardertitle:(nsstring *)title;

@end

#import "shcollectionreusableview.h"
#import "lshcontrol.h"

@interface shcollectionreusableview (){

  uilabel *titlelabel;
}

@end

@implementation shcollectionreusableview


-(id)initwithframe:(cgrect)frame{

  self=[super initwithframe:frame];

  if (self) {

    self.backgroundcolor=[uicolor greencolor];
    [self createbasicview];
  }
  return self;

}

/**
 *  进行基本布局操作,根据需求进行.
 */
-(void)createbasicview{


 titlelabel=[lshcontrol createlabelwithframe:cgrectmake(5, 0,self.frame.size.width-50, self.frame.size.height) font:[uifont systemfontofsize:14.0] text:@"" color:[uicolor graycolor]];
 [self addsubview:titlelabel];


}


/**
 *  设置相应的数据
 *
 *  @param title 
 */
-(void)getshcollectionreusableviewheardertitle:(nsstring *)title{

  titlelabel.text=title;

}

@end

效果如下图:

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