IOS仿微信朋友圈好友展示

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.
}

@end

3.效果图