根据字数分别设置两组数据cell的宽度
写一个#import "HeaderView.h"类继承于UICollectionReusableView
#import
@interface HeaderView : UICollectionReusableView
/** titleLabel */
@property (nonatomic,strong) UILabel *titleLabel;
@end
#import "HeaderView.h"
@implementation HeaderView
-(UILabel *)titleLabel{
if (_titleLabel == nil) {
_titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 10, 50, 20)];
_titleLabel.textColor = [UIColor greenColor];
_titleLabel.textAlignment = NSTextAlignmentCenter;
}
return _titleLabel;
}
- (void)awakeFromNib {
[super awakeFromNib];
// Initialization code
}
- (void)applyLayoutAttributes:(UICollectionViewLayoutAttributes *)layoutAttributes{
[self addSubview:self.titleLabel];
}
同理再写一个写一个#import "FooterView.h"类继承于UICollectionReusableView
#import
@interface FooterView : UICollectionReusableView
/** titleLabel */
@property (nonatomic,strong) UILabel *titleLabel;
@end
#import "FooterView.h"
@implementation FooterView
-(UILabel *)titleLabel{
if (_titleLabel == nil) {
_titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 10, 50, 20)];
_titleLabel.textColor = [UIColor greenColor];
_titleLabel.textAlignment = NSTextAlignmentCenter;
}
return _titleLabel;
}
- (void)awakeFromNib {
[super awakeFromNib];
// Initialization code
}
- (void)applyLayoutAttributes:(UICollectionViewLayoutAttributes *)layoutAttributes{
[self addSubview:self.titleLabel];
}
在ViewController里面写上相应代码
#import "ViewController.h"
#import "HeaderView.h"
#import "FooterView.h"
#import "CollectionViewCell.h"
#define SCREEN_WIDTH ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)]?[UIScreen mainScreen].nativeBounds.size.width/[UIScreen mainScreen].nativeScale:[UIScreen mainScreen].bounds.size.width)
#define SCREENH_HEIGHT ([[UIScreen mainScreen] respondsToSelector:@selector(nativeBounds)]?[UIScreen mainScreen].nativeBounds.size.height/[UIScreen mainScreen].nativeScale:[UIScreen mainScreen].bounds.size.height)
#ifdef DEBUG // 开发阶段-DEBUG阶段:使用Log
#define NSLog(FORMAT, ...) fprintf(stderr,"%s:%d\t%s\n",[[[NSString stringWithUTF8String:__FILE__] lastPathComponent] UTF8String], __LINE__, [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String]);
#else // 发布阶段-上线阶段:移除Log
#define NSLog(FORMAT, ...) nil
#endif
@interface ViewController ()
/** shuzu */
@property (nonatomic,strong) NSArray *stringArray1;
/** shuzu */
@property (nonatomic,strong) NSArray *stringArray2;
@property (nonatomic,strong) UICollectionView *collectionView;
@property (nonatomic,strong) UICollectionViewFlowLayout *collectionViewFlowLayout;
@end
@implementation ViewController
-(UICollectionView *)collectionView{
if (_collectionView==nil) {
_collectionViewFlowLayout = [[UICollectionViewFlowLayout alloc]init];
_collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 20, SCREEN_WIDTH, SCREENH_HEIGHT-20) collectionViewLayout:self.collectionViewFlowLayout];
_collectionView.delegate = self;// 设置代理
_collectionView.dataSource = self; // 设置数据源代理
_collectionView.showsHorizontalScrollIndicator = NO;
_collectionView.backgroundColor = [UIColor colorWithRed:239/255.0f green:237/255.0f blue:237/255.0f alpha:1] ; // 设置背景
// 注册cell的类型
// 以代码的方式注册Cell的类型, 表示创建Cell的时候用这个类型来创建
/*
第一个参数: Cell的类型
第二个参数: 重用标志
*/
// [_collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"channelID"];
[_collectionView registerNib:[UINib nibWithNibName:@"CollectionViewCell" bundle:[NSBundle mainBundle]] forCellWithReuseIdentifier:@"channelID"];
// 3. 横向间距
_collectionViewFlowLayout.minimumInteritemSpacing = 5;
// 4. 纵向间距
_collectionViewFlowLayout.minimumLineSpacing = 10;
//新建headerView类, 继承自UICollectionReusableView
//注册header
/*
第一个参数:header视图对象的类型
第二个参数:区分是header还是后面的footer
// UICollectionElementKindSectionHeader表示header类型
第三个参数:重用标志
*/
[_collectionView registerClass:[HeaderView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"header"];
//
// //新建FooterView类, 继承自UICollectionReusableView
// //注册footer
[_collectionView registerClass:[FooterView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"footer"];
}
return _collectionView;
}
- (NSArray *)stringArray1{
if (_stringArray1 == nil) {
_stringArray1 = @[@"第一个参数",@"第一数新类一个参数",@"参数",@"第一个参数View类一个参数",@"第一个参数",@"建Fw类",@"第",@"第",@"第一个参数",@"第w类",@"第一个参数",@"第一个参数新ew类"];
}
return _stringArray1;
}
- (NSArray *)stringArray2{
if (_stringArray2 == nil) {
_stringArray2 = @[@"header视图",@"继承iew",@"heade类型",@"继承自UIC",@"head的类型",@"继承自ableView",@"heade",@"继承",@"header视",@"继承自UICw",@"head",@"继承自"];
}
return _stringArray2;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.view addSubview:self.collectionView];
}
-(NSArray*)layoutAttributesForElementsInRect:(CGRect)rect{
NSMutableArray* attributes = [[self.collectionViewFlowLayout layoutAttributesForElementsInRect:rect] mutableCopy];
for (UICollectionViewLayoutAttributes *attr in attributes) {
NSLog(@"%@", NSStringFromCGRect([attr frame]));
}
//从第二个循环到最后一个
for(int i = 1; i < [attributes count]; ++i) {
//当前attributes
UICollectionViewLayoutAttributes *currentLayoutAttributes = attributes[i];
//上一个attributes
UICollectionViewLayoutAttributes *prevLayoutAttributes = attributes[i - 1];
//我们想设置的最大间距，可根据需要改
NSInteger maximumSpacing = 0;
//前一个cell的最右边
NSInteger origin = CGRectGetMaxX(prevLayoutAttributes.frame);
//如果当前一个cell的最右边加上我们想要的间距加上当前cell的宽度依然在contentSize中，我们改变当前cell的原点位置
//不加这个判断的后果是，UICollectionView只显示一行，原因是下面所有cell的x值都被加到第一行最后一个元素的后面了
if(origin + maximumSpacing + currentLayoutAttributes.frame.size.width < self.collectionViewFlowLayout.collectionViewContentSize.width) {
CGRect frame = currentLayoutAttributes.frame;
frame.origin.x = origin + maximumSpacing;
currentLayoutAttributes.frame = frame;
}
}
return attributes;
}
#pragma mark - 遵守协议, 实现协议方法
/*
// 返回每一个Cell的对象
// UICollectionView上面的每一个Cell是UICollectionViewCell类型(或子类型)的对象
// UICollectionViewCell也是一个视图
*/
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
// 从重用队列里面获取
/*
第一个参数: 重用id
第二个参数: cell的位置
*/
// UITableView -> NSIndexPath:section row
// UICollectionView -> NSIndexPath:section item
CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"channelID" forIndexPath:indexPath];
// 不需要再创建, 从dequeueReusableCellWithReuseIdentifier方法李米娜一定能够获取到
// 设置背景颜色
cell.backgroundColor = [UIColor lightGrayColor];
cell.titlelabel.text = [NSString stringWithFormat:@"%@",indexPath.section ==0?self.stringArray1[indexPath.row]:self.stringArray2[indexPath.row]];
cell.titlelabel.font = [UIFont fontWithName:@"HelveticaNeue" size:10.0f];
cell.titlelabel.textColor = [UIColor whiteColor];
cell.layer.masksToBounds = YES;
cell.layer.cornerRadius = 15;
return cell;
}
#pragma mark - 在布局对象的代理协议方法中设置header的大小
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section
{
return CGSizeMake(SCREEN_WIDTH, 40);
}
#pragma mark - 在布局对象的代理协议方法中设置footer的大小
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section
{
return CGSizeMake(SCREEN_WIDTH, 0);
}
#pragma mark - 返回header对象 UICollectionViewDataSource的协议方法(也可以用来返回footer对象)
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
{
if (kind == UICollectionElementKindSectionHeader) {
// header类型
// 从重用队列里面获取
HeaderView *header = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"header" forIndexPath:indexPath];
// 设置背景颜色
header.backgroundColor = [UIColor redColor];
// [header addSubview:header.titleLabel];
// 显示数据
header.titleLabel.text = [NSString stringWithFormat:@"第%c组", (int)(indexPath.section + 'A')];
return header;
} else if (kind == UICollectionElementKindSectionFooter) {
// footer
// 从重用队列里面获取
FooterView *footer = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"footer" forIndexPath:indexPath];
footer.backgroundColor = [UIColor purpleColor];
// 显示数据
footer.titleLabel.text = [NSString stringWithFormat:@"第%c组结束", (int)(indexPath.section + 'A')];
return footer;
}
return nil;
}
//#pragma mark - UICollectionViewDelegate methods
- (NSInteger) numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 2;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return section==0?self.stringArray1.count:self.stringArray2.count;
}
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
// 3.设置整个collectionView的内边距
CGFloat paddingY = 5;
CGFloat paddingX = 20;
return UIEdgeInsetsMake(paddingY, paddingX, paddingY, paddingX);
}
//
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
// 2.设置每个格子的尺寸
// layout.itemSize = CGSizeMake(250, 250);
CGFloat nameW = [self withString:indexPath.section==0?self.stringArray1[indexPath.row]:self.stringArray2[indexPath.row]];
return CGSizeMake((nameW<=80)?80:nameW, 30);
}
- (CGFloat)withString:(NSString *)string{
//设置string字体 HelveticaNeue Courier
UIFont *font = [UIFont fontWithName:@"HelveticaNeue" size:15.0f];
//根据字体得到nsstring的尺寸
CGSize size = [string sizeWithAttributes:[NSDictionary dictionaryWithObjectsAndKeys:font,NSFontAttributeName, nil]];
//名字的高
// CGFloat nameH = size.height;
//名字的宽
CGFloat nameW = size.width;
return nameW>SCREEN_WIDTH?SCREEN_WIDTH-20:nameW;
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"点击的是%ld组的第%ld个cell",indexPath.section,indexPath.row);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
效果图
项目地址
WX20170306-181557.png