首先来看看要实现的效果图
示例代码如下
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
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;@endstatic 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.} |
|
1
2
3
4
5
6
7
|
#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 |
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
#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 |
总结
以上就是这篇文章的全部内容，希望本文的内容对大家的学习或者工作能有所帮助，如果有疑问大家可以留言交流。
