首先来看看要实现的效果图
示例代码如下
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untitled.gif
#import "viewcontroller.h"
#import "collectionviewcell.h"
#import "collectionsectionview.h"
@interface viewcontroller ()<uicollectionviewdelegateflowlayout,uicollectionviewdatasource>
@property (nonatomic,strong)uicollectionview *collectionview;
@property (nonatomic,copy)nsstring *leftorright;
@property (nonatomic,strong)nsindexpath *clickindexpath;
@end
static nsstring *cellidentifier = @"collectionviewcell";
static nsstring *sectionidentifier = @"collectionsectionview";
@implementation viewcontroller
- (void)viewdidload {
[super viewdidload];
// do any additional setup after loading the view, typically from a nib.
uicollectionviewflowlayout *flowlayout = [[uicollectionviewflowlayout alloc] init];
flowlayout.itemsize = cgsizemake(50, 25);
flowlayout.minimumlinespacing = 0;
flowlayout.minimuminteritemspacing = 0;
flowlayout.headerreferencesize = cgsizemake(0, 40);
flowlayout.sectioninset = uiedgeinsetsmake(0, 0, 0, 0);
self.collectionview = [[uicollectionview alloc] initwithframe:self.view.frame collectionviewlayout:flowlayout];
_collectionview.backgroundcolor = [uicolor whitecolor];
_collectionview.delegate = self;
_collectionview.datasource = self;
[_collectionview registerclass:[collectionviewcell class] forcellwithreuseidentifier:cellidentifier];
[_collectionview registerclass:[collectionsectionview class] forsupplementaryviewofkind:uicollectionelementkindsectionheader withreuseidentifier:sectionidentifier];
[self.view addsubview:_collectionview];
}
- (nsinteger)numberofsectionsincollectionview:(uicollectionview *)collectionview{
return 3;
}
- (nsinteger)collectionview:(uicollectionview *)collectionview numberofitemsinsection:(nsinteger)section{
if (self.clickindexpath.section == section) {
if (self.clickindexpath.section == 0 && [self.leftorright isequaltostring:@"left"]) {
return 3;
}
if (self.clickindexpath.section == 0 && [self.leftorright isequaltostring:@"right"]) {
return 4;
}
if (self.clickindexpath.section == 1 && [self.leftorright isequaltostring:@"left"]) {
return 10;
}
if (self.clickindexpath.section == 1 && [self.leftorright isequaltostring:@"right"]) {
return 8;
}
if (self.clickindexpath.section == 2 && [self.leftorright isequaltostring:@"left"]) {
return 33;
}
if (self.clickindexpath.section == 2 && [self.leftorright isequaltostring:@"right"]) {
return 6;
}
}
return 0;
}
- (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath{
collectionviewcell *cell = [collectionview dequeuereusablecellwithreuseidentifier:cellidentifier forindexpath:indexpath];
cell.label.text = [nsstring stringwithformat:@"%ld-%ld",indexpath.section,indexpath.row];
return cell;
}
- (uicollectionreusableview *)collectionview:(uicollectionview *)collectionview viewforsupplementaryelementofkind:(nsstring *)kind atindexpath:(nsindexpath *)indexpath{
if ([kind isequaltostring:uicollectionelementkindsectionheader]) {
collectionsectionview *sectionview = [collectionview dequeuereusablesupplementaryviewofkind:kind withreuseidentifier:sectionidentifier forindexpath:indexpath];
sectionview.backgroundcolor = [uicolor lightgraycolor];
sectionview.leftstr = @"家具";
sectionview.rightstr = @"家电";
[sectionview custombtnhandelaction:^(nsstring *leftorright) {
self.clickindexpath = indexpath;
self.leftorright = leftorright;
[collectionview reloaddata];
}];
return sectionview;
}
return nil;
}
- (void)didreceivememorywarning {
[super didreceivememorywarning];
// dispose of any resources that can be recreated.
}
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#import <uikit/uikit.h>
typedef void(^btnhandleaction)(nsstring *leftorright);
@interface collectionsectionview : uicollectionreusableview
@property (nonatomic,copy)nsstring *leftstr;
@property (nonatomic,copy)nsstring *rightstr;
- (void)custombtnhandelaction:(btnhandleaction)action;
@end
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#import "collectionsectionview.h"
@interface collectionsectionview ()
@property (nonatomic,strong)uibutton *leftbtn;
@property (nonatomic,strong)uibutton *rightbtn;
@property (nonatomic,copy)btnhandleaction btnhandelaction;
@end
@implementation collectionsectionview
- (instancetype)initwithframe:(cgrect)frame
{
self = [super initwithframe:frame];
if (self) {
[self setup];
}
return self;
}
- (uibutton *)leftbtn{
if (!_leftbtn) {
self.leftbtn = [uibutton buttonwithtype:(uibuttontypecustom)];
_leftbtn.tag = 2000;
_leftbtn.frame = cgrectmake(1, 1, self.frame.size.width / 2 - 2, self.frame.size.height - 2);
_leftbtn.backgroundcolor = [uicolor whitecolor];
[_leftbtn addtarget:self action:@selector(btnaction:) forcontrolevents:(uicontroleventtouchupinside)];
}
return _leftbtn;
}
- (uibutton *)rightbtn{
if (!_rightbtn) {
self.rightbtn = [uibutton buttonwithtype:(uibuttontypecustom)];
_rightbtn.tag = 2001;
_rightbtn.frame = cgrectmake(self.frame.size.width / 2 + 1, 1, self.frame.size.width / 2 - 2, self.frame.size.height - 2);
_rightbtn.backgroundcolor = [uicolor whitecolor];
[_rightbtn addtarget:self action:@selector(btnaction:) forcontrolevents:(uicontroleventtouchupinside)];
}
return _rightbtn;
}
- (void)btnaction:(uibutton *)sender{
nsinteger tag = sender.tag;
if (tag == 2000) {
self.btnhandelaction(@"left");
}
if (tag == 2001) {
self.btnhandelaction(@"right");
}
}
- (void)custombtnhandelaction:(btnhandleaction)action{
self.btnhandelaction = action;
}
- (void)setup{
[self addsubview:self.leftbtn];
[self addsubview:self.rightbtn];
}
- (void)setleftstr:(nsstring *)leftstr{
[self.leftbtn settitle:leftstr forstate:(uicontrolstatenormal)];
[self.leftbtn settitlecolor:[uicolor blackcolor] forstate:(uicontrolstatenormal)];
}
- (void)setrightstr:(nsstring *)rightstr{
[self.rightbtn settitle:rightstr forstate:(uicontrolstatenormal)];
[self.rightbtn settitlecolor:[uicolor blackcolor] forstate:(uicontrolstatenormal)];
}
@end
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总结
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