yinmeng-ios/xplan-ios/Main/Message/SessionList/SessionListViewController.m

//
//  SessionListViewController.m
//  xplan-ios
//
//  Created by zu on 2021/11/25.
//

#import "SessionListViewController.h"
#import "SessionListCell.h"
#import "SessionViewController.h"
#import "ThemeColor.h"
#import "XPMacro.h"

#import <Masonry/Masonry.h>

@interface SessionListViewController ()<UITableViewDataSource, UITableViewDelegate, NIMLoginManagerDelegate, NIMConversationManagerDelegate>

@property (nonatomic,strong) UIView *customNavigationBar;

@property (nonatomic,strong) UILabel *titleLabel;

/**
 *  会话列表
 */
@property (nonatomic,strong) UITableView *sessionListView;

/**
 *  最近会话集合
 */
@property (nonatomic,strong) NSMutableArray<NIMRecentSession *> *recentSessions;

@end

@implementation SessionListViewController

- (void)dealloc {
    [[NIMSDK sharedSDK].conversationManager removeDelegate:self];
    [[NIMSDK sharedSDK].loginManager removeDelegate:self];
}

- (BOOL)isHiddenNavBar {
    return YES;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    [self initViews];
    [self initLayout];
    [self initDatas];
    
    [[NIMSDK sharedSDK].conversationManager addDelegate:self];
    [[NIMSDK sharedSDK].loginManager addDelegate:self];
}

- (void)initViews {
    [self.customNavigationBar addSubview:self.titleLabel];
    [self.view addSubview:self.customNavigationBar];
    [self.view addSubview:self.sessionListView];
}

- (void)initLayout {
    [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.center.mas_equalTo(self.customNavigationBar);
    }];
    
    [self.sessionListView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.bottom.mas_equalTo(self.view);
        make.top.mas_equalTo(self.customNavigationBar.mas_bottom);
    }];
}

- (void)initDatas {
    _recentSessions = [[NIMSDK sharedSDK].conversationManager.allRecentSessions mutableCopy];
    if (!self.recentSessions.count) _recentSessions = [NSMutableArray array];
    NSMutableArray<NSString *> * uids = [[NSMutableArray alloc] init];
    [self.recentSessions enumerateObjectsUsingBlock:^(NIMRecentSession * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        [uids addObject:obj.session.sessionId];
    }];
    [[NIMSDK sharedSDK].userManager fetchUserInfos:uids completion:^(NSArray<NIMUser *> * _Nullable users, NSError * _Nullable error) {
        [self.sessionListView reloadData];
    }];
}

#pragma mark - UITableViewDelegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    NIMRecentSession *recentSession = self.recentSessions[indexPath.row];
    SessionViewController *vc = [[SessionViewController alloc] initWithSession:recentSession.session];
    [self.navigationController pushViewController:vc animated:YES];
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return 75.f;
}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    return YES;
}

#pragma mark - UITableViewDataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return self.recentSessions.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString * cellId = @"cellId";
    SessionListCell * cell = [tableView dequeueReusableCellWithIdentifier:cellId];
    if (!cell) {
        cell = [[SessionListCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellId];
    }
    NIMRecentSession *recent = self.recentSessions[indexPath.row];
    [cell renderWithSession:recent];
    return cell;
}

#pragma mark - NIMConversationManagerDelegate
- (void)didLoadAllRecentSessionCompletion {
    [self initDatas];
    [self.sessionListView reloadData];
}

- (void)didAddRecentSession:(NIMRecentSession *)recentSession
           totalUnreadCount:(NSInteger)totalUnreadCount {
    [self.recentSessions addObject:recentSession];
    [self.recentSessions sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
        NIMRecentSession *item1 = obj1;
        NIMRecentSession *item2 = obj2;
        if (item1.lastMessage.timestamp < item2.lastMessage.timestamp) {
            return NSOrderedDescending;
        }
        if (item1.lastMessage.timestamp > item2.lastMessage.timestamp) {
            return NSOrderedAscending;
        }
        return NSOrderedSame;
    }];
    [self.sessionListView reloadData];
}

- (void)didUpdateRecentSession:(NIMRecentSession *)recentSession
              totalUnreadCount:(NSInteger)totalUnreadCount {
    for (NIMRecentSession *recent in self.recentSessions) {
        if ([recentSession.session.sessionId isEqualToString:recent.session.sessionId]) {
            [self.recentSessions removeObject:recent];
            break;
        }
    }
    NSInteger insert = [self findInsertPlace:recentSession];
    [self.recentSessions insertObject:recentSession atIndex:insert];
    [self.sessionListView reloadData];
}

- (void)didRemoveRecentSession:(NIMRecentSession *)recentSession
              totalUnreadCount:(NSInteger)totalUnreadCount {
    // 清理本地数据
    NSUInteger index = [self.recentSessions indexOfObject:recentSession];
    [self.recentSessions removeObjectAtIndex:index];
    
    // 如果删除本地会话后就不允许漫游当前会话，则需要进行一次删除服务器会话的操作
    BOOL deleteRemote = NO;
    if (deleteRemote) {
        [[NIMSDK sharedSDK].conversationManager deleteRemoteSessions:@[recentSession.session]
                                                          completion:nil];
    }
    [self.sessionListView reloadData];
}

#pragma mark - NIMLoginManagerDelegate
- (void)onLogin:(NIMLoginStep)step {
    if (step == NIMLoginStepSyncOK) {
        [self.sessionListView reloadData];
    }
}

#pragma mark - Private
- (NSInteger)findInsertPlace:(NIMRecentSession *)recentSession{
    __block NSUInteger matchIdx = 0;
    __block BOOL find = NO;
    [self.recentSessions enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        NIMRecentSession *item = obj;
        if (item.lastMessage.timestamp <= recentSession.lastMessage.timestamp) {
            *stop = YES;
            find  = YES;
            matchIdx = idx;
        }
    }];
    if (find) {
        return matchIdx;
    } else {
        return self.recentSessions.count;
    }
}

- (void)sort{
    [self.recentSessions sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {
        NIMRecentSession *item1 = obj1;
        NIMRecentSession *item2 = obj2;
        if (item1.lastMessage.timestamp < item2.lastMessage.timestamp) {
            return NSOrderedDescending;
        }
        if (item1.lastMessage.timestamp > item2.lastMessage.timestamp) {
            return NSOrderedAscending;
        }
        return NSOrderedSame;
    }];
}

- (UIView *)customNavigationBar {
    if (!_customNavigationBar) {
        CGRect frame = CGRectMake(0, kStatusBarHeight, KScreenWidth, 44);
        _customNavigationBar = [[UIView alloc]initWithFrame:frame];
    }
    return _customNavigationBar;
}

- (UILabel *)titleLabel {
    if (!_titleLabel) {
        _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
        _titleLabel.backgroundColor = [UIColor clearColor];
        _titleLabel.font = [UIFont systemFontOfSize:18.f weight:UIFontWeightMedium];
        _titleLabel.textColor = ThemeColor.mainTextColor;
        _titleLabel.text = @"消息";
    }
    return _titleLabel;
}

- (UITableView *)sessionListView {
    if (!_sessionListView) {
        _sessionListView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
        _sessionListView.separatorStyle = UITableViewCellSeparatorStyleNone;
        _sessionListView.backgroundColor = UIColor.clearColor;
        _sessionListView.delegate = self;
        _sessionListView.dataSource = self;
    }
    return _sessionListView;
}

@end