Objective-C + 发布对象

Question

我在我的应用程序中使用了以下函数:

+(TeamTournamentLookUp  *)getOpponentTeamTournamentLookUp:(int)tournamentId:(int)opponentTeamId
{
    TeamTournamentLookUp *objOpponentTTL = nil;
    const char *sql = "SELECT TeamTournamentLookUpID, TournamentID, TeamID, NumberOfWins, NumberOfLosses, NumberOfDraws, Points, Rank, IsUserTeam from TeamTournamentLookUp where TournamentID = ? and TeamID = ?";
    sqlite3_stmt *selectstmt;
    if(sqlite3_prepare_v2(database, sql, -1, &selectstmt, NULL) != SQLITE_OK) 
    NSAssert1(0, @"Error. '%s'", sqlite3_errmsg(database));

    sqlite3_bind_int(selectstmt, 1, tournamentId);
    sqlite3_bind_int(selectstmt, 2, opponentTeamId);

    if(SQLITE_DONE != sqlite3_step(selectstmt))
    {
        NSInteger primaryKey = sqlite3_column_int(selectstmt, 0);
        objOpponentTTL = [[TeamTournamentLookUp alloc] initWithPrimaryKey:primaryKey];
        objOpponentTTL.tournamentId = sqlite3_column_int(selectstmt, 1);
        objOpponentTTL.teamId = sqlite3_column_int(selectstmt, 2);
        objOpponentTTL.numberOfWins = (sqlite3_column_type(selectstmt, 3) == SQLITE_NULL) ? 0 : sqlite3_column_int(selectstmt, 3);
        objOpponentTTL.numberOfLosses = (sqlite3_column_type(selectstmt, 4) == SQLITE_NULL) ? 0 : sqlite3_column_int(selectstmt, 4);
        objOpponentTTL.numberOfDraws = (sqlite3_column_type(selectstmt, 5) == SQLITE_NULL) ? 0 : sqlite3_column_int(selectstmt, 5);
        objOpponentTTL.points = (sqlite3_column_type(selectstmt, 6) == SQLITE_NULL) ? 0 : sqlite3_column_int(selectstmt, 6);
        objOpponentTTL.rank = (sqlite3_column_type(selectstmt, 7) == SQLITE_NULL) ? 0 : sqlite3_column_int(selectstmt, 7);
        objOpponentTTL.isUserTeam = (sqlite3_column_type(selectstmt, 9) == SQLITE_NULL) ? 0 : sqlite3_column_int(selectstmt, 9);
    }

    return objOpponentTTL;
}

基本上我要返回一个 TeamTournamentLookUp 类的对象。

在我分配对象的代码中: objOpponentTTL = [[TeamTournamentLookUp alloc] initWithPrimaryKey:primaryKey];

现在我的问题是我应该在哪里释放对象？

Answer 1

如果您正在为 Objective C 2 编写代码，那么您不需要编写更多代码，只需使用垃圾回收进行构建即可。如果对于包括 iPhone 在内的早期版本，则您需要在某个阶段发布它。

在这种情况下，通常的方法是在创建它时自动释放它。例如

objOpponentTTL = [[[TeamTournamentLookUp alloc] initWithPrimaryKey:primaryKey]autorelease];

当您到达自动释放池时，该对象将被释放。在 NSApplication 中默认有其中之一，并在输入循环中被调用。

有关内存管理的更多信息，请阅读 Apple's docs on memory management