Question

我想从部分过滤NSArray，但我的结果是空的。请看下面的代码。

我有我的动物课。

@interface Animal : NSObject
{
   int _id;
   NSString *_name;
}

@property (nonatomic, assign) int id;
@property (nonatomic, copy) NSString *name;

- (id) initWithUniquedId:(int)strId strName:(NSString *)strName;

//实现Animal.m

- (id) initWithUniquedId:(int)strId strName:(NSString *)strName{
   if(self = [super init]){
      self.id = strId;
      self.name = strName;
   }
   return self;
}

这是我从数据库获取数据的功能;

- (NSArray *)getAnimalInfo : (NSString *) argType{
      // [...] Open database
      NSMutableArray *data = [[NSMutableArray alloc] init];
      NSString *query = [NSString stringWithFormat: @"SELECT * FROM animal WHERE type = %@ ", argType];
      sqlite3_stmt *sqlstmt;

      if(sqlite3_prepare_v2(database, [query UTF8Sring], -1, &sqlstmt, nil) == SQLITE_OK){
         while(sqlite3_step(sqlstmt) == SQLITE_ROW){
            int tmpId = sqlite3_column_int (sqlstmt, 0);
            char *tmpName = (char *) sqlite3_column_text (sqlstmt, 1);

            // Create object from class animal
            Animal *am = [[Animal alloc] initWithUniquedId: tmpId strName: tmpName];
            [data addObject: am];
         }
         sqlite3_finalize(sqlstmt);
      }
      // close database
      return data;
}

在我的viewcontroller中，我已经实现了代码来获取所有动物信息。

- (void)viewDidLoad{
  myData = [[NSArray alloc] init];

  // There are many type of animal, so I need make it as section;
  // This is what I show my tableview by section something like: poultry, dog, fish....

  [myData addObject: [self getAnimalInfo: "poultry"]]; //type: poultry will contain many row
  [myData addObject: [self getAnimalInfo: "dog"]]; //type: dog will contain many row
  [myData addObject: [self getAnimalInfo: "fish"]]; //type: fish will contain many row
}

它们运作良好并且显示正常。

我想要的是从myData数组中按名称搜索这些信息。看看我正在使用的代码是filterArrayUsingPredicate，但是没有结果。我想知道如何从myData数组中搜索？

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF.name CONTAINS [cd] %@", myStringSearch];
self.myFilterAnimal = [myData filterArrayUsingPredicate:predicate;
NSLog(@"%@", self.myFilterAnimal];

//但没有结果。

抱歉我的英语不好。感谢阅读。

如何使用谓词从节中过滤NSArray

0 个答案: