自己模仿iphone通信录的搜索联系人的实现

　模仿手机通讯录，及新浪微博联系人列表查找功能的实现，支持拼音查找，拼音首字母查找等功能。取汉字拼音及拼音首字母是下载网上的源代码，在数据处理中，感觉处理不是太好，但又想不出太好的方法。

　原始数据为　中英文混合名称的数组，需要取到各名字的首字母分组，并能支持汉字拼音首字母搜索及拼音搜索，主要将原始数据与对应的拼音数据，拼音首字母数据生成字典，使用NSPredicate 过滤器，分别过滤，然后合并到搜索结果数组中

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"SELF contains[cd] %@", searchText];

NSArray *result1 = [self.allItems filteredArrayUsingPredicate:resultPredicate];
NSArray *result2 = [[tmpDict allKeys] filteredArrayUsingPredicate:resultPredicate];

self.searchResults = [[NSMutableArray alloc] initWithArray:result1];
for (NSString* str in result2) {
NSString* strVal = [tmpDict objectForKey:str];
if (![self.searchResults containsObject:strVal]) {
[self.searchResults addObject:strVal];
}
}
}

在viewDidLoad进行初始数据准备工作

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

self.tableView.scrollEnabled = YES;

NSArray *items = [[NSArray alloc] initWithObjects:@"大鹏鸟哥",@"Code Geass",@"曹操", @"海贼王专属", @"makuna_mata", @"King3顺", @"sunnysun", @"３M字节",  @"李开穷", @"携手漫步2012",@"四月de蔷薇",@"onepiece海贼王海迷",@"时尚精简语录", @"小S", @"妈唉", nil];

tmpDict = [NSMutableDictionary dictionary];

NSMutableArray* array = [[NSMutableArray alloc] init];
NSMutableArray* itemArray = [[NSMutableArray alloc] init];

for (int i = 0; i < [items count]; i++) {
NSString *str = [items objectAtIndex:i];
char p = [ChineseToPinyin sortSectionTitle:str];
NSString* charStr = [[NSString alloc] initWithFormat:@"%c", p];

if (![array containsObject:charStr]) {
[array addObject:charStr];
}

NSString* str2 = [ChineseToPinyin pinyinFirstLetterFromChineseString:str];
if (str2) {
[tmpDict setObject:str forKey:str2];
}
NSString* str3 = [ChineseToPinyin pinyinFromChiniseString:str];
[tmpDict setObject:str forKey:str3];
}

//排序数组, 数据量大，效率一般
sectionArray = [array sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
int i = 0;
for (NSString *title in sectionArray) {
//NSLog(@"%@", title);
char ch = [title characterAtIndex:0];
indexArray[i++] = [itemArray count];
for (NSString *item in items) {
char p = [ChineseToPinyin sortSectionTitle:item];
if (p == ch) {
[itemArray addObject:item];
//NSLog(@"%@", item);
}
}
}
self.allItems = itemArray;

[self.tableView reloadData];
}

tableView的 委托，数据源接口实现如下：

-(NSString *)tableView:(UITableView *)tv titleForHeaderInSection:(NSInteger)section
{
if ([tv isEqual:self.searchDisplayController.searchResultsTableView]){
NSString *str = @"本地搜索结果";
return str;
}
return [sectionArray objectAtIndex:section];
}

-(NSArray *)sectionIndexTitlesForTableView:(UITableView *)tv
{
if ([tv isEqual:self.searchDisplayController.searchResultsTableView]){
return nil;
}
return sectionArray;
}

-(NSInteger)tableView:(UITableView *)tv numberOfRowsInSection:(NSInteger)section
{
NSInteger rows = 0;

if ([tv isEqual:self.searchDisplayController.searchResultsTableView]){
rows = [self.searchResults count];
}else{
NSInteger start = indexArray[section];
NSInteger end = indexArray[section+1];
if (end == 0) {
end = [self.allItems count];
}
rows = end-start;
}
return rows;
}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tv
{
if ([tv isEqual:self.searchDisplayController.searchResultsTableView]){
return 1;
}
return [sectionArray count];
}

-(UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tv dequeueReusableCellWithIdentifier:@"SearchCell"];

if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:@"SearchCell"];
}

if ([tv isEqual:self.searchDisplayController.searchResultsTableView]){
cell.textLabel.text = [self.searchResults objectAtIndex:indexPath.row];
}else{
NSInteger sec = indexPath.section;
NSInteger idx = indexArray[sec];
idx += indexPath.row;
cell.textLabel.text = [self.allItems objectAtIndex:idx];
}
return cell;
}

运行结果如下：