iphone - 对 NSStrings 的 NSArray 进行排序，就像在 iphone 上排序的地址簿一样

Question

我有一个字符串数组(名称)

我想像 iphone 上的地址簿一样对它们进行排序

• 例如:éli -> E 下
• 例如:àli -> A 下
• 例如:4li -> #下

有什么建议吗？

Answer 1

您需要对字符串执行不区分变音符号的比较。 NSString有一个 compare:options: 方法，带有 NSDiacriticInsensitiveSearch 选项。

NSArray *array = [NSArray arrayWithObjects:@"éli", @"bob", @"earl", @"allen", @"àli", @"aaron", nil];

NSArray *sorted = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    return [(NSString*)obj1 compare:obj2 options:NSDiacriticInsensitiveSearch|NSCaseInsensitiveSearch];
}];

编辑:

这是一个完整的示例，它将根据不区分变音符号的第一个字符来划分结果。我放入了字典，因此您需要自己跟踪排序的键才能正确显示。

NSArray *array = [NSArray arrayWithObjects:@"éli", @"bob", @"earl", @"allen", @"àli", nil];

NSArray *sorted = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    return [(NSString*)obj1 compare:obj2 options:NSDiacriticInsensitiveSearch|NSCaseInsensitiveSearch];
}];

NSMutableDictionary *sectioned = [NSMutableDictionary dictionary];
NSString *firstChar = nil;

for(NSString *str in sorted)
{
    //Ignore empty strings
    if(![str length])continue;

    NSMutableArray *names = nil;

    //Compare the first character using diacritic insensitive search
    if([str compare:firstChar options:NSDiacriticInsensitiveSearch|NSCaseInsensitiveSearch range:NSMakeRange(0, 1)] == NSOrderedSame)
    {
        names = [sectioned objectForKey:firstChar];
    }
    else
    {
        //decomposedStringWithCanonicalMapping is where the magic happens
        //(it removes the accent mark)
        firstChar = [[str decomposedStringWithCanonicalMapping] substringToIndex:1];
        names = [NSMutableArray array];
        [sectioned setObject:names forKey:firstChar];
    }

    [names addObject:str];
}

NSLog(@"sorted: %@", sorted);
//This is sectioned like the address app
NSLog(@"sectioned: %@", sectioned);