iOS 7 - 使用带有普通 NSArray 的 MLPAutoCompleteTextField

Question

我对 iOS 开发比较陌生，我想在我的应用程序中实现一个自动完成文本字段。在做研究时，我遇到了this library , MLPAutoCompleteTextField。我下载了它，运行了 Demo，并试图了解它是如何工作的。

据我所知，该演示使用 Array 的自定义类和自定义单元格 View ，这就是演示中的自动完成包含该国国旗的原因。

然而，我想要实现的是一个更简单的版本，它只使用一个数组，没有更多的数据和单元格布局的自定义类。

这是我到目前为止所拥有的:

我的 FirstViewController.h 文件

#import <UIKit/UIKit.h>   
#import "MLPAutoCompleteTextFieldDataSource.h"
#import "MLPAutoCompleteTextFieldDelegate.h"

@interface FirstViewController : UIViewController <UITextFieldDelegate, MLPAutoCompleteTextFieldDataSource, MLPAutoCompleteTextFieldDelegate>

@property (strong, nonatomic) NSArray *groupID;
@property (strong, nonatomic) NSMutableArray *part;
@property (strong, nonatomic) NSMutableArray *brand;
@property (strong, nonatomic) NSMutableArray *barcode;
@property (strong, nonatomic) NSMutableArray *itemName;

@property (weak) IBOutlet MLPAutoCompleteTextField *groupIDInput;
@property (weak) IBOutlet MLPAutoCompleteTextField *partInput;
@property (weak) IBOutlet MLPAutoCompleteTextField *brandInput;
@property (weak) IBOutlet MLPAutoCompleteTextField *barcodeInput;
@property (weak) IBOutlet MLPAutoCompleteTextField *itemNameInput;

@property (strong, nonatomic, retain) IBOutlet UIButton *searchButton;

@property (assign) BOOL testWithAutoCompleteObjectsInsteadOfStrings;

@end

如您所见，我有 5 个 AutoCompleteTextViews，我打算使用 5 个数组来为 autoCompleteTextViews 提供数据。

这是我的 FirstViewController.m 文件:

#import "FirstViewController.h"
#import "FMDatabase.h"
#import "FMDatabaseAdditions.h"
#import "MLPAutoCompleteTextFieldDataSource.h"
#import "MLPAutoCompleteTextFieldDelegate.h"
#import "MLPAutoCompleteTextField.h"

@interface FirstViewController ()

@end

@implementation FirstViewController

@synthesize groupID;
@synthesize part;
@synthesize brand;
@synthesize barcode;
@synthesize itemName;

@synthesize groupIDInput;
@synthesize partInput;
@synthesize brandInput;
@synthesize barcodeInput;
@synthesize itemNameInput;

@synthesize searchButton;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self setType];
}

- (void)didReceiveMemoryWarning{
   [super didReceiveMemoryWarning];
   // Dispose of any resources that can be recreated.
}


#pragma mark - MLPAutoCompleteTextField DataSource

- (void)groupIDInput:(MLPAutoCompleteTextField *)textField
 possibleCompletionsForString:(NSString *)string
        completionHandler:(void (^)(NSArray *))handler{
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
    dispatch_async(queue, ^{

        NSArray *completions;
        if(self.testWithAutoCompleteObjectsInsteadOfStrings){
           completions = [self allCountryObjects];
        } else {
          completions = [self allCountries];
        }

        handler(completions);
    });
}


-(void) setType{
   [self.groupIDInput setAutoCompleteTableAppearsAsKeyboardAccessory:NO];
}


- (NSArray *)allCountryObjects{
  if(!self.groupID){
      NSArray *countryNames = [self allCountries];
      NSMutableArray *mutableCountries = [NSMutableArray new];
      for(NSString *countryName in countryNames){
          [mutableCountries addObject:countryName];
      }

      [self setGroupID:[NSArray arrayWithArray:mutableCountries]];
  }

  return self.groupID;
}

- (NSArray *)allCountries{
    NSArray *countries =
   @[/* Insert Long List of Countries Here */];

   return countries;
}

@end

但是，我现在的问题是，在演示中，有一行 [self.autocompleteTextField registerAutoCompleteCellClass:[DEMOCustomAutoCompleteCell class]其中使用了自定义单元格类。我觉得我也应该创建自己的自定义单元类，即使我没有实现任何花哨的东西。

所以，问题是:

我必须实现自己的 CustomAutoCompleteObject 和 CustomAutoCompleteCell 吗？如果没有，我怎样才能通过使用简单的数组来实现这个库？

任何帮助表示赞赏。在过去的 4-5 个小时里，我一直在研究这个问题，我缺乏 iOS 开发知识，这对我造成了影响。

更新 1:

我尝试使用预先声明的数组而不是由数据库查询填充的可变数组，我还进行了一些更改，如下所示:

- (void)autoCompleteTextField:(MLPAutoCompleteTextField *)textField
 possibleCompletionsForString:(NSString *)string
            completionHandler:(void (^)(NSArray *))handler{
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
    dispatch_async(queue, ^{

        NSArray *completions;
        //completions = [self allCountries];
        completions = [self initializeGroupIDArray];

        handler(completions);
    });
}

此功能附加到 Storyboard 。

而我的 initializeGroupIDArray 如下:

-(NSArray *)initializeGroupIDArray{
    // Getting the database path.
    NSArray  *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docsPath = [paths objectAtIndex:0];
    NSString *dbPath = [docsPath stringByAppendingPathComponent:@"itemList.db"];

    NSMutableArray *groupArray =    @[/* Insert List of Countries Here */];


    FMDatabase *database = [FMDatabase databaseWithPath:dbPath];
    [database open];

    NSString *sqlSelectQuery = @"SELECT DISTINCT GROUPID FROM ItemList";

    // Query result
    FMResultSet *resultsWithNameLocation = [database executeQuery:sqlSelectQuery];

    while([resultsWithNameLocation next]) {
        NSString *queryResult = [NSString stringWithFormat:@"%@",[resultsWithNameLocation stringForColumn:@"GROUPID"]];

        // loading your data into the array, dictionaries.
        NSLog(@"GroupID = %@", queryResult);
        [groupArray addObject:queryResult];
    }
    [database close];

    NSArray *groupID;
    [groupID = groupArray copy];
    return groupID;

}

但是，在我看来，我没有正确添加数据库查询的结果。有人有想法吗？

Answer 1

我没有初始化我的可变数组。现在是这样的:

#pragma mark - MLPAutoCompleteTextField DataSource

- (void)autoCompleteTextField:(MLPAutoCompleteTextField *)textField
 possibleCompletionsForString:(NSString *)string
            completionHandler:(void (^)(NSArray *))handler{
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
    dispatch_async(queue, ^{

        NSLog(@"autoCompleteTextField Entered");

        NSArray *completions;
        completions = [self allGroups];

        handler(completions);
    });
}

allGroups 函数:

-(NSArray *)allGroups{

    NSLog(@"allGroups Entered");

    // Getting the database path.
    NSArray  *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docsPath = [paths objectAtIndex:0];
    NSString *dbPath = [docsPath stringByAppendingPathComponent:@"itemList.db"];

    NSMutableArray *groupArray = [[NSMutableArray alloc] init]; //This bad body right here.

    FMDatabase *database = [FMDatabase databaseWithPath:dbPath];
    [database open];

    NSString *sqlSelectQuery = @"SELECT DISTINCT GROUPID FROM ItemList";

    // Query result
    FMResultSet *resultsWithNameLocation = [database executeQuery:sqlSelectQuery];

    while([resultsWithNameLocation next]) {
        NSString *groupIDName = [NSString stringWithFormat:@"%@",[resultsWithNameLocation stringForColumn:@"GROUPID"]];

        // loading your data into the array, dictionaries.
        NSLog(@"Group ID = %@", groupIDName);
        [groupArray addObject:groupIDName];
    }
    [database close];


    NSLog(@"size of groupArray (mutbale): %d", [groupArray count]);
    for (NSUInteger i = 0; i < [groupArray count]; i++){
        NSLog(@"Group Array (mutable) :%@", groupArray[i]);
    }

    NSArray *groupID;
    [groupID = groupArray copy];

    NSLog(@"size of groupID (immutbale): %d", [groupID count]);
    for (NSUInteger i = 0; i < [groupID count]; i++){
        NSLog(@"Group ID (non mutable) :%@", groupID[i]);
    }

    NSLog(@"allGroups before return statement");
    return groupID;

}