用uicollectionview怎么实现网格效果图
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发布时间：2022-04-22 02:35
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时间：2023-06-30 02:22
KMCollectionViewCell.h
1 #import <UIKit/UIKit.h>
2
3 @interface KMCollectionViewCell : UICollectionViewCell
4 @property (strong, nonatomic) IBOutlet UIImageView *imgVCustom;
5 @property (strong, nonatomic) IBOutlet UILabel *lblDesc;
6
7 @end
KMCollectionViewCell.m
1 #import "KMCollectionViewCell.h"
2
3 @implementation KMCollectionViewCell
4
5 - (id)initWithFrame:(CGRect)frame { //由于没调用，所以不会触发initWithFrame方法
6 if (self = [super initWithFrame:frame]) {
7 //Some codes as the content of drawRect's method
8 }
9 return self;
10 }
11
12 - (void)drawRect:(CGRect)rect { //drawRect方法会在每次对象实例化时调用
13 _imgVCustom.layer.masksToBounds = YES;
14 _imgVCustom.layer.cornerRadius = _imgVCustom.frame.size.width/2.0; //设置圆角；当值为正方形图片视图的宽度一半时，就为圆形
15
16 _lblDesc.adjustsFontSizeToFitWidth = YES; //设置是否根据内容自适应调整字体大小；默认值为NO
17 }
18
19 @end
ViewController.h
1 #import <UIKit/UIKit.h>
2
3 @interface ViewController : UIViewController <UICollectionViewDataSource, UICollectionViewDelegate>
4 @property (strong, nonatomic) NSMutableArray *mArrData;
5 @property (strong, nonatomic) IBOutlet UICollectionView *collVCustom;
6
7 @end
ViewController.m
1 #import "ViewController.h"
2
3 #import "KMCollectionViewCell.h"
4 @interface ViewController ()
5 - (void)layoutUI;
6 @end
7
8 @implementation ViewController
9
10 #define kNumberOfImage 9
11 #define kNumberOfCells 25
12 #define kNumberOfColumns 3
13 #define kPaddingOfScreen 20.0
14
15 - (void)viewDidLoad {
16 [super viewDidLoad];
17
18 [self layoutUI];
19 }
20
21 - (void)didReceiveMemoryWarning {
22 [super didReceiveMemoryWarning];
23 // Dispose of any resources that can be recreated.
24 }
25
26 - (void)layoutUI {
27 self.view.backgroundColor = [UIColor whiteColor];
28 self.navigationItem.title = @"使用UICollectionView实现网格化视图效果";
29
30 //填充作为数据源的可变长数组_mArrData的数据
31 _mArrData = [[NSMutableArray alloc] initWithCapacity:kNumberOfCells];
32 for (NSUInteger i=0; i<kNumberOfCells; i++) {
33 UIImage *imgCustom = [UIImage imageNamed:[NSString stringWithFormat:@"%lu", (i%kNumberOfImage + 1)]];
34 NSString *strDesc = [NSString stringWithFormat:@"第%lu张照片", (i+1)];
35 //NSDictionary *dicData = @{ @"image":imgCustom, @"desc":strDesc }; //考虑字典是否是可变的，如果需要修改里面的键值对的话，建议用NSMutableDictionary
36
37 //NSMutableDictionary *mDicData = [NSMutableDictionary dictionaryWithObjectsAndKeys:imgCustom, @"image", strDesc, @"desc", nil];
38 NSMutableDictionary *mDicData =[[NSMutableDictionary alloc] initWithDictionary:@{ @"image":imgCustom, @"desc":strDesc }];
39 [_mArrData addObject:mDicData];
40 }
41
42 _collVCustom.dataSource = self;
43 _collVCustom.delegate = self;
44 //NSLog(@"%0.2f, %0.2f", _collVCustom.frame.size.width, _collVCustom.frame.size.height);
45 }
46
47 #pragma mark - CollectionView : UICollectionViewDataSource
48 - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
49 return 1;
50 }
51
52 - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
53 return kNumberOfCells;
54 }
55
56 - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
57 static NSString *cellIdentifier = @"cellIdentifier";
58 KMCollectionViewCell *cell = (KMCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];
59
60 NSMutableDictionary *mDicData = _mArrData[indexPath.row];
61 cell.imgVCustom.image = mDicData[@"image"];
62 cell.lblDesc.text = mDicData[@"desc"];
63 return cell;
}
65
66 - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {
67 // The view that is returned must be retrieved from a call to -dequeueReusableSupplementaryViewOfKind:withReuseIdentifier:forIndexPath:
68 return nil;
69 }
70
71 #pragma mark - CollectionView : UICollectionViewDelegate
72 - (BOOL)collectionView:(UICollectionView *)collectionView shouldHighlightItemAtIndexPath:(NSIndexPath *)indexPath {
73 return YES;
74 }
75
76 - (void)collectionView:(UICollectionView *)collectionView didHighlightItemAtIndexPath:(NSIndexPath *)indexPath {
77 NSLog(@"didHighlightItemAtIndexPath:, indexPath.row=%ld ", (long)indexPath.row);
78 }
79
80 - (void)collectionView:(UICollectionView *)collectionView didUnhighlightItemAtIndexPath:(NSIndexPath *)indexPath {
81 NSLog(@"didUnhighlightItemAtIndexPath:, indexPath.row=%ld ", (long)indexPath.row);
82 }
83
84 - (BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath {
85 return YES;
86 }
87
88 - (BOOL)collectionView:(UICollectionView *)collectionView shouldDeselectItemAtIndexPath:(NSIndexPath *)indexPath {
return YES;
90 }
91
92 - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
93 NSMutableDictionary *mDicData = _mArrData[indexPath.row];
94 mDicData[@"desc"] = @"你点击了我"; //[mDicData setValue:@"你点击了我" forKey:@"desc"];
95 [collectionView reloadItemsAtIndexPaths:@[indexPath]];
96
97 NSLog(@"didSelectItemAtIndexPath:, indexPath.row=%ld ", (long)indexPath.row);
98 }
99
100 - (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath {
101 //在didSelectItemAtIndexPath执行了reloadItemsAtIndexPaths会导致didDeselectItemAtIndexPath失效不执行，所以以下打印的语句不会执行
102
103 NSLog(@"didDeselectItemAtIndexPath:, indexPath.row=%ld ", (long)indexPath.row);
104 }
105
106 /*
107 #pragma mark - CollectionView : UICollectionViewDelegateFlowLayout
108 - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
109 return CGSizeMake(80.0, 120.0);
110 }
111
112 - (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
113 return UIEdgeInsetsMake(5.0, 5.0, 5.0, 5.0);
114 }
115
116 - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
117 return 10.0;
118 }
119
120 - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
121 return 10.0;
122 }
123
124 - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section {
125 return CGSizeMake(5.0, 5.0);
126 }
127
128 - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section {
129 return CGSizeMake(5.0, 5.0);
130 }
131 */
132
133 @end
