慢iOS应用

Question

我想找出我的应用程序慢的原因。以下是我的视图控制器所做的工作：

1. (viewDidLoad)使用AFNetworking从with服务中检索数据。
2. 解析响应，创建自定义对象并将其保存在字典中。
3. 重新加载表视图数据以填充自定义对象。

我的AFNetworking电话：

NSString *url = Utils urlForObjectType:objectGames；AFHTTPRequestOperationManager *manager = AFHTTPRequestOperationManager管理器；AFJSONRequestSerializer *requestSerializer = AFJSONRequestSerializer序列化程序；requestSerializer setValue:@"application/json“forHTTPHeaderField:@"Accept"；manager.requestSerializer = requestSerializer；[manager GET:url参数:0成功：^(AFHTTPRequestOperation*操作，id responseObject) { self didReceiveGames:operation.responseData；} failure:^(AFHTTPRequestOperation *操作，NSError *error) {NSLog(@error：%@，error)；}]；

TableView方法：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *identifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
    if (cell == nil)
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault  reuseIdentifier:identifier];


        NSString *competition = [competitionNames objectAtIndex:indexPath.section];
        NSArray *competitionGames = [competitions objectForKey:competition];
        Game *game = [competitionGames objectAtIndex:indexPath.row];

        Team *teamA = [game teamA];
        Team *teamB = [game teamB];

        UILabel *labelTeamA = (UILabel *)[cell viewWithTag:100];
        UILabel *labelTeamB = (UILabel *)[cell viewWithTag:101];
        UILabel *labelResultA = (UILabel *)[cell viewWithTag:102];
        [labelResultA setText:nil];
        UILabel *labelResultB = (UILabel *)[cell viewWithTag:103];
        [labelResultB setText:nil];
        UIImageView *imageTeamA = (UIImageView *)[cell viewWithTag:104];
        UIImageView *imageTeamB = (UIImageView *)[cell viewWithTag:105];

        UILabel *labelState = (UILabel *)[cell viewWithTag:106];
        [labelState setText:nil];

        GameState state = [game state];

        NSString *urlImageA = [Utils urlForObjectType:objectTeamImage andID:[teamA teamID]];
        NSString *urlImageB = [Utils urlForObjectType:objectTeamImage andID:[teamB teamID]];

        /* Time Background */
        UIImageView *timeBackground = (UIImageView *) [cell viewWithTag:107];
        [timeBackground setHidden:NO];

        [cell setBackgroundColor:[UIColor clearColor]];

            switch (state) {
                case statePlayed: {
                    [labelResultA setText:[NSString stringWithFormat:@"%d", [game finalResultA]]];
                    [labelResultB setText:[NSString stringWithFormat:@"%d", [game finalResultB]]];
                    [timeBackground setHidden:YES];
                }

                    break;
                case stateFixture: {
                    /* Set labelState to hours */
                    NSDate *date = [game date];
                    NSDateComponents *components = [[NSCalendar currentCalendar] components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear | NSCalendarUnitHour | NSCalendarUnitMinute fromDate:date];

                    NSString *minutes;
                    if ([components minute] == 0) {
                        minutes = @"00";
                    } else {
                        minutes = [NSString stringWithFormat:@"%d", [components minute]];
                    }
                    [labelState setText:[NSString stringWithFormat:@"%dh%@", [components hour], minutes]];
                }
                    break;
                case stateCancelled:
                    [labelState setText:@"CANCELLED"];
                    break;
                case statePlaying: {
                    [labelResultA setText:[NSString stringWithFormat:@"%d", [game finalResultA]]];
                    [labelResultB setText:[NSString stringWithFormat:@"%d", [game finalResultB]]];
                    [timeBackground setHidden:YES];
                }
                    break;
                case statePostponed:
                    [labelState setText:@"POSTPONED"];
                    break;
                case stateSuspended:
                    [labelState setText:@"SUSPENSED"];
                    break;
                default:
                    break;
            }

            [labelTeamA setText:[teamA name]];
            [labelTeamB setText:[teamB name]];
            [imageTeamA setImageWithURL:[NSURL URLWithString:urlImageA]];
            [imageTeamB setImageWithURL:[NSURL URLWithString:urlImageB]];

    return cell;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    NSArray *competitionGames = [competitions objectForKey:[competitionNames objectAtIndex:section]];
    return [competitionGames count];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return [competitionNames count];
}

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    UIView *header = [[NSBundle mainBundle] loadNibNamed:@"GamesHeaderIPAD" owner:self options:nil][0];

    NSString *competitionName = [[competitionNames objectAtIndex:section] uppercaseString];

    UILabel *labelCompetition = (UILabel *)[header viewWithTag:100];
    [labelCompetition setText:competitionName];

    return header;
}

-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
    return 42;
}

编辑：与AFNetworking无关，我只是在NSUserDefaults中保存了响应，从那里读取它，它仍然很慢。

谢谢

Answer 1

在另一个线程中调用webservice。

就我个人而言，我喜欢使用中央调度。这个问题sync in Grand Central Dispatch展示了一些很好的语法。将所有要运行的内容放在dispatch_async部件的后台，当服务获得它的数据时，您可以在dispatch_sync部件中安全地更新/重新加载表视图。

Answer 2

您可以将此方法用于背景处理：

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
    NSString *url = [Utils urlForObjectType:objectGames];

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    AFJSONRequestSerializer *requestSerializer = [AFJSONRequestSerializer serializer];
    [requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    manager.requestSerializer = requestSerializer;
    [manager GET:url parameters:nil success:^(AFHTTPRequestOperation *operation,id responseObject) {
        dispatch_async(dispatch_get_main_queue(), ^{
           [self didReceiveGames:operation.responseData];
        }];
    }     
    failure:^(AFHTTPRequestOperation *operation, NSError *error) {

         dispatch_async(dispatch_get_main_queue(), ^{
           [self didReceiveGames:operation.responseData];
        }];
    NSLog(@"Error: %@", error);
       }];
    });

Answer 3

在这种情况下加快速度的第一步是将viewWithTag替换为IBOutlets。