Question

我有一个UITableView，其中自定义cellView填充了一个数组（cf. functs），没有任何部分。我的目标是创建一个带有列表索引的搜索栏（这是可以的）（这是问题）。在阅读了大量文档后，我计划使用这三种方法：“numberOfSectionsInTableView”，“sectionIndexTitlesForTableView”和“sectionForSectionIndexTitle”

如何使用以下结构创建NSDictionnary个functs数组？

//in viewDidLoad
// Initialize the functs array
Funct *funct1 = [Funct new];
funct1.name = @"AAA";
funct1.detail = @"detail1...";
funct1.image = @"a.jpg";

Funct *funct2 = [Funct new];
funct2.name = @"BBB";
funct2.prepTime = @"detail2...";
funct2.image = @"b.jpg";

functs = [NSArray arrayWithObjects:funct, funct2, nil]; //etc.

//For Index list: one section per letter
NSString *letters = @"a b c d e f g h i j k l m n o p q r s t u v w x y z";
self.indexTitlesArray = [letters componentsSeparatedByString:@" "];

提前致谢

Answer 1

Here你有一个很好的示例项目教程。这就是你要找的东西。

这是TableView索引的一个示例，但它有一个很好的例子，用于分段和行

在此示例中，此方法对您非常有用

static NSString *letters = @"abcdefghijklmnopqrstuvwxyz";

// This method returns an array of dictionaries where each key is a letter
// and each value is a group of words corresponding to the letter. 
+ (NSArray *) wordsFromLetters {
    NSMutableArray *content = [NSMutableArray new];

    for (int i = 0; i < [letters length]; i++ ) {
       NSMutableDictionary *row = [[[NSMutableDictionary alloc] init] autorelease];
       char currentWord[WORD_LENGTH + 1];
       NSMutableArray *words = [[[NSMutableArray alloc] init] autorelease];

       for (int j = 0; j < WORD_LENGTH; j++ ) {
          if (j == 0) {
              currentWord[j] = toupper([letters characterAtIndex:i]);
          }
          else {
              currentWord[j] = [letters characterAtIndex:i];
          }
          currentWord[j+1] = '\0';
          [words addObject:[NSString stringWithCString:currentWord encoding:NSASCIIStringEncoding]];
       }
       char currentLetter[2] = { toupper([letters characterAtIndex:i]), '\0'};        
       [row setValue:[NSString stringWithCString:currentLetter encoding:NSASCIIStringEncoding] 
           forKey:@"headerTitle"];
       [row setValue:words forKey:@"rowValues"];        
       [content addObject:row];
    }

    return content;
}

您可以从此资源中获取主要想法，但如果您愿意，我会调整代码。我认为工作正常

    NSMutableArray *funcsArray = [NSMutableArray array];//Here you add all your functs objects
    [funcsArray addObjects: funct1, funct2...];
    NSSortDescriptor *sortDescriptor;
    sortDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"name"
                                                  ascending:YES selector:@selector(localizedCaseInsensitiveCompare:)] autorelease];
    NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
    NSArray *sortedArray;
    sortedArray = [funcsArray sortedArrayUsingDescriptors:sortDescriptors];
    NSMutableArray *funcsArrayOrdered = [NSMutableArray array];//Here you add all your functs objects
    NSMutableArray *funcsIndexed = [NSMutableArray array];
    NSMutableArray *letters = [NSMutableArray array];
    NSString *currentLetter = nil;

    int numItems = [funcsArrayOrdered count];

    for (Funct *functObj in funcsArrayOrdered) {
        NSLog(@"funct: %@", functObj.name);
        numItems--;
        NSString *string = userT.name;
        if (string.length > 0) {
            NSString *letter = [[string substringToIndex:1] uppercaseString];
            if ([currentLetter length] == 0) {
                currentLetter = letter;
            }
            if (![letter isEqualToString:currentLetter] || numItems == 0) {
                if ([letter isEqualToString:currentLetter] && numItems == 0) {
                    [letters addObject:functObj];
                    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
                    [dic setValue:currentLetter forKey:@"headerTitle"];
                    [dic setValue:letters forKey:@"rowValues"];
                    [funcsIndexed addObject:dic];
                    letters = [NSMutableArray array];
                }else{
                    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
                    [dic setValue:currentLetter forKey:@"headerTitle"];
                    [dic setValue:letters forKey:@"rowValues"];
                    [funcsIndexed addObject:dic];
                    letters = [NSMutableArray array];
                    [letters addObject:functObj];
                    currentLetter = letter;
                    if (numItems == 0 && [funcsArrayOrdered count] > 1) {
                        NSMutableDictionary *dic = [NSMutableDictionary dictionary];
                        [dic setValue:currentLetter forKey:@"headerTitle"];
                        [dic setValue:letters forKey:@"rowValues"];
                        [funcsIndexed addObject:dic];
                    }
                }
            }else {
                [letters addObject:functObj];
            }
        }
    }

现在，您将在funcsIndexed

中排序您的词典数组

如何从包含自定义单元格的数组创建NSDictionary

1 个答案: