iPhone 由于 stringWithUTF8String 导致内存泄漏

Question

我有以下代码，显示了 stringWithUTF8String 语句附近最喜欢的对象的内存泄漏。

我已经声明了该特性的最爱

-(NSMutableArray *) readFavoritesFromDatabase 
{
 // Check if database is present
 [self setDatabaseNameAndPath];
 [self checkAndCreateDatabase];

 // Setup the database object
 sqlite3 *database;

 //Initialize favorites array
 if (favorites == nil) 
 {
  [favorites release];
  favorites = [[NSMutableArray alloc] init];
 }
 else 
 {
  favorites = nil;
  [favorites removeAllObjects];
 }


 // Open the database from the users file system
 if(sqlite3_open([self.dataBasePath UTF8String], &database) == SQLITE_OK) 
 {
  // Setup the SQL Statement and compile it for faster access
  const char *sqlStatement = "select * from Favorites";
  sqlite3_stmt *compiledStatement;

  if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) 
  {

   // Loop through the results and add them to the favorites array
   while(sqlite3_step(compiledStatement) == SQLITE_ROW) 
   {
    // Create Favorite object and add it to the Favorite array
    Favorite *favorite = [[[Favorite alloc] init] autorelease];

    favorite.cameraID = [NSString stringWithUTF8String:(const char*)sqlite3_column_text(compiledStatement, 0)];
    favorite.cameraName = [NSString stringWithUTF8String:(const char*)sqlite3_column_text(compiledStatement, 1)];
    favorite.cameraLink = [NSString stringWithUTF8String:(const char*)sqlite3_column_text(compiledStatement, 2)];

    [self.favorites addObject:favorite];
    //[favorite.cameraID release];
//    [favorite.cameraName release];
//    [favorite.cameraLink release];
   }

   // If favorite cameras exists in database, then sort the Favorites array 
   if([self.favorites count]>0)
   {

    NSSortDescriptor *favoritesNameSorter = [[NSSortDescriptor alloc] initWithKey:@"cameraName" ascending:YES];
    [self.favorites sortUsingDescriptors:[NSArray arrayWithObject:favoritesNameSorter]];
    [favoritesNameSorter release];
   }
  }

  // Release the compiled statement from memory
  sqlite3_finalize(compiledStatement);
 }

 // Close the database
 if(database !=nil)
 {
  sqlite3_close(database);
  return self.favorites;
 }
 else 
 {
  return nil;
 }
}

请告诉我如何解决这个内存泄漏问题提前致谢。

Answer 1

使用这种安全的方法:

Favorite *tempFavorite = [[Favorite alloc] init];
self.favorite = tempFavorite;
[tempFavorite release];

通常，在您最喜欢的 dealloc 函数中，您应该在调用 super dealloc 函数之前删除所有对象并清理必要的对象。

使用这种方式，你不需要担心 favorite 是否为 nil，因为 Objective-C 允许调用 nil 对象的方法

问候

梅厄·阿萨亚格