通讯录界面效果

动态效果

前两天有个朋友问我微信中的通讯录界面怎么实现的,然后写了个Demo给他参考,整理了下，主要难点在于:中文,英文,特殊符号,表情混合排序,其次就是搜索功能，这里索引里面还得有搜索符号。如果你在使用时因为translucent属性遇到了问题，请参考我后面写的另外一篇文章使用UISearchController时 navigationBar translucent 属性导致的问题总结

难点剖析

• 获取中文首字母

-(NSString *)chineseStringFirstCharactor
{
    NSAssert(self.length>0, @"chineseStringFirstCharactor String can not is nil");
    //转成可变字符串
    NSMutableString *str = [[NSMutableString alloc]initWithString:self];
    //先转换为带声调的拼音
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformToLatin, NO);
    //再转换为不带声调的拼音
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
    //转化为大写拼音
    NSString *pinString = [str capitalizedString];
    //获取并返回首字母
    return [[pinString substringToIndex:1]uppercaseString];
    
}

• 字符串中文开头判断

-(BOOL)isChineseCharacterBegin
{
    NSAssert(self.length>0, @"isChineseCharacterBegin String can not is nil");
    int a = [self characterAtIndex:0];
    if( a > 0x4e00 && a < 0x9fff)
        return YES;
    else
        return NO;
}

• 英文字母开头判断

-(BOOL)isLettersBegin
{
    NSAssert(self.length>0, @"isLettersBegin String can not is nil");
    NSString *regex = @"[A-Za-z]+";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
    NSString *preString = [self substringToIndex:1];
    return [predicate evaluateWithObject:preString];
}

• 字母排序

[resultMuArray sortedArrayUsingSelector:@selector(compare:)];

• 添加带搜索符号的索引字符

[rightIndexArray insertObject:UITableViewIndexSearch atIndex:0];

• 添加searchBar

self.showTableView.tableHeaderView = self.searchController.searchBar;

#pragma mark - property
-(UISearchController *)searchController
{
    if (!_searchController) {
        _searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
        _searchController.searchResultsUpdater = self;
        _searchController.delegate = self;
        _searchController.dimsBackgroundDuringPresentation = YES;
        _searchController.hidesNavigationBarDuringPresentation = YES;
        _searchController.searchBar.placeholder = @"Search";
        [_searchController.searchBar sizeToFit];
        _searchController.searchBar.keyboardType = UIKeyboardTypeDefault;
    }
    return _searchController;
}

特别注意

1. 我们在字母排序时首先要对数组里面的字母大小写要统一,不然排序错乱。

2. 我们在对字符串进行首字母判断时,如果字符串前面有空格或回车则需要去掉。例如

string = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];//去除空格和回车

下载链接

GitHub