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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:
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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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