使用Section UITableView按字母顺序对联系人排序

Question

我有一个NSMutableArray:self.contact带有对象(名称按字母顺序排序):

(
    "Anna Haro",
    "Cheesy Cat",
    "Daniel Higgins",
    "David Taylor",
    "Freckles Dog",
    "Hank Zakroff",
    "John Appleseed",
    "Kate Be\U00e9ll"
)

我用这行代码成功地在右边显示了字母:

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
        return[NSArray arrayWithObjects:@"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", nil];
    }

现在,我要实现允许我访问好部分的方法？

- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString*)title atIndex:(NSInteger)index {

}

也许我要改变numberOfSections？这是我的代码:

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1
}

下一个 :

我做了两个阵列NSArray *test = [self.contact sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];:

(
    "Anna Haro",
    "Cheesy Cat",
    "Daniel Higgins",
    "David Taylor",
    "Freckles Dog",
    "Hank Zakroff",
    "John Appleseed",
    "Kate Be\U00e9ll"
)

和

NSMutableDictionary dicoAlphabet:

// Dictionary will hold our sub-arrays
    self.dicoAlphabet = [NSMutableDictionary dictionary];

    // Iterate over all the values in our sorted array
    for (NSString *value in test) {

        // Get the first letter and its associated array from the dictionary.
        // If the dictionary does not exist create one and associate it with the letter.
        NSString *firstLetter = [value substringWithRange:NSMakeRange(0, 1)];
        NSMutableArray *arrayForLetter = [self.dicoAlphabet objectForKey:firstLetter];
        if (arrayForLetter == nil) {
            arrayForLetter = [NSMutableArray array];
            [self.dicoAlphabet setObject:arrayForLetter forKey:firstLetter];
        }

        // Add the value to the array for this letter
        [arrayForLetter addObject:value];
    }

    // arraysByLetter will contain the result you expect
    NSLog(@"Dictionary: %@", self.dicoAlphabet);

回报:

Dictionary: {
    A =     (
        "Anna Haro"
    );
    C =     (
        "Cheesy Cat"
    );
    D =     (
        "Daniel Higgins",
        "David Taylor"
    );
    F =     (
        "Freckles Dog"
    );
    H =     (
        "Hank Zakroff"
    );
    J =     (
        "John Appleseed"
    );
    K =     (
        "Kate Be\U00e9ll"
    );
}

Answer 1

尝试以下链接。将帮助您轻松完成此操作。如果您在执行此操作时遇到任何问题，请告诉我。联系视图控制器部分标题和索引的教程

因此，对于非静态数据，假设您有一个名为 arrContacts 的联系人数组，那么您可以使用[arrContacts sortUsingSelector: @selector( localizedCaseInsensitiveCompare:)]now 轻松对其进行排序，以获取包含所有部分标题的数组，只需循环遍历该数组，并为每个对象将字符串修剪为第一个字母和如果尚不存在，则添加到该数组中。就是这样，现在您在一个数组中有一个部分列表，在另一个数组中有按字母顺序排序的联系人。让我知道事情的后续。;)