前几天小伙伴要帮他做一个群聊功能,里面有好友列表,要求和微信的差不多(见下图),让小伙伴自己实现了下，他将CollectionView放在tableView的tableHead中,可是当添加好友或删除好友刷新数据源的时候并没有效果。让他将CollectionView放在tableView的cell中,结果是数据刷新了可是还是有问题删除后刷新数据时CollectionView的高度变的有问题,我就调了下,实现比较简单,只是一些细节问题,现在效果还蛮不错的,分享一下.
1.定义CollectionViewCell,并为删除按钮添加一个block
2.用TableView＋CollectionView显示 此时注意:计算CollectionView的高度时,要注意行数是整数而且要有余进1
#import "ViewController.h"
#import "CustomTableViewCell.h"
#import "TKQunSheZhiCollectionViewCell.h"
@interface ViewController ()<UITableViewDelegate,UITableViewDataSource,UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout>
{
UITableView *_mTableView;
CGFloat _imgHeight;
UICollectionView *_mCollectionView;
NSMutableArray *_mDataArray;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self initTableView];
_mDataArray = [NSMutableArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"3",@"4",@"5", nil];
}
//----------TableView---
- (void)initTableView
{
_mTableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStyleGrouped];
_mTableView.delegate = self;
_mTableView.dataSource = self;
[self.view addSubview:_mTableView];
}
//UITableViewDelegate,UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 3;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 0) {
static NSString *cellIdentifier = @"UITableViewCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
if (_mCollectionView) {
[_mCollectionView removeFromSuperview];
}
[cell.contentView addSubview:[self createCollectionView]];
return cell;
}else{
static NSString *cellStr = @"customCell";
CustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellStr];
if (cell == nil) {
cell = [[[NSBundle mainBundle] loadNibNamed:@"CustomTableViewCell" owner:nil options:nil] lastObject];
}
cell.nameLabel.text = @"AAA";
return cell;
}
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 0) {
float height=((self.view.frame.size.width - 50)/4 + 30) * ((int)(_mDataArray.count + 4)/4) + 20;
return height;
}else{
return 44;
}
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return 0.001;
}
//---------CollectionView----
- (UICollectionView *)createCollectionView
{
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
_imgHeight = (self.view.frame.size.width - 50)/4;
layout.itemSize = CGSizeMake((self.view.frame.size.width - 50)/4, _imgHeight + 20);
layout.minimumLineSpacing = 10;
layout.minimumInteritemSpacing = 10;
layout.sectionInset = UIEdgeInsetsMake(10, 10, 10, 10);
_mCollectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, ((_imgHeight + 30) * ((int)(_mDataArray.count + 4)/4)) + 20) collectionViewLayout:layout];
_mCollectionView.delegate = self;
_mCollectionView.dataSource = self;
_mCollectionView.backgroundColor = [UIColor whiteColor];
_mCollectionView.scrollEnabled = NO;
[_mCollectionView registerNib:[UINib nibWithNibName:@"TKQunSheZhiCollectionViewCell" bundle:nil] forCellWithReuseIdentifier:@"TKQunSheZhiCollectionViewCell"];
return _mCollectionView;
}
//UICollectionViewDataSource,UICollectionViewDelegate
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return _mDataArray.count + 1;
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"%@",indexPath);
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
TKQunSheZhiCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"TKQunSheZhiCollectionViewCell" forIndexPath:indexPath];
if (indexPath.row < 1) {
cell.mNickName.hidden = YES;
cell.mDelBtn.hidden = YES;
if (indexPath.row == 0) {
cell.mHeadImg.image = [UIImage imageNamed:@"qunzu-jiahao"];
}
else if (indexPath.row == 1){
cell.mHeadImg.image = [UIImage imageNamed:@"qunzu-jianhao"];
}
}else{
cell.delMemberBlock = ^()
{
[_mDataArray removeLastObject];
[_mTableView reloadData];
};
}
return cell;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end3.效果图