UITableView 自带索引，一直用第三方的控件也没有认真研究，今天又碰到了类似问题，于是专门研究了下详细的内容，记录于此。
- 1.创建TableView
@property (strong, nonatomic) UITableView *tableView;
//需添加代理和数据源
- 2.随机生成一些基础数据
NSArray *xings = @[@"赵",@"钱",@"孙",@"李",@"周",@"吴",@"郑",@"王",@"冯",@"陈",@"楚",@"卫",@"沈",@"杀",@"韩",@"杨"];
NSArray *ming1 = @[@"大",@"美",@"帅",@"应",@"超",@"海",@"江",@"湖",@"春",@"夏",@"秋",@"冬",@"上",@"左",@"有",@"纯"];
NSArray *ming2 = @[@"强",@"好",@"领",@"亮",@"超",@"华",@"奎",@"海",@"工",@"青",@"红",@"潮",@"兵",@"垂",@"刚",@"山"];
for (int i = 0; i < count; i++) {
NSString *name = xings[arc4random_uniform((int)xings.count)];
NSString *ming = ming1[arc4random_uniform((int)ming1.count)];
name = [name stringByAppendingString:ming];
if (arc4random_uniform(10) > 3) {
NSString *ming = ming2[arc4random_uniform((int)ming2.count)];
name = [name stringByAppendingString:ming];
}
//数据模型进行存储
SDContactModel *model = [SDContactModel new];
model.name = name;
model.imageName = [SDAnalogDataGenerator randomIconImageName];
[self.dataArray addObject:model];
}
- 3.关键排序
_contacts = [self arrayForSections:objects];
[_tableView reloadData];
- (NSArray *)arrayForSections:(NSArray *)objects {
SEL selector = @selector(name);
UILocalizedIndexedCollation *collation = [UILocalizedIndexedCollation currentCollation];
// sectionTitlesCount 27 , A - Z + #
// section number
NSInteger sectionTitlesCount = [[collation sectionTitles] count];
// Create 27 sections' data
NSMutableArray *mutableSections = [[NSMutableArray alloc] initWithCapacity:sectionTitlesCount];
for (NSUInteger idx = 0; idx < sectionTitlesCount; idx++) {
[mutableSections addObject:[NSMutableArray array]];
}
// Insert records
for (id object in objects) {
NSInteger sectionNumber = [collation sectionForObject:object collationStringSelector:selector];
[[mutableSections objectAtIndex:sectionNumber] addObject:object];
}
// sort in section
for (NSUInteger idx = 0; idx < sectionTitlesCount; idx++) {
NSArray *objectsForSection = [mutableSections objectAtIndex:idx];
[mutableSections replaceObjectAtIndex:idx withObject:[[UILocalizedIndexedCollation currentCollation] sortedArrayFromArray:objectsForSection collationStringSelector:selector]];
}
// Remove empty sections && insert table data
NSMutableArray *existTitleSections = [NSMutableArray array];
for (NSArray *section in mutableSections) {
if ([section count] > 0) {
[existTitleSections addObject:section];
}
}
// Remove empty sections Index in indexList
NSMutableArray *existTitles = [NSMutableArray array];
NSArray *allSections = [collation sectionIndexTitles];
for (NSUInteger i = 0; i < [allSections count]; i++) {
if ([mutableSections[ i ] count] > 0) {
[existTitles addObject:allSections[ i ]];
}
}
//create indexlist data array
self.indexList = existTitles;
return existTitleSections;
}
- 4.TableView右侧索引
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
return _indexList;
}
5.索引小结
索引排序关键是用UILocalizedIndexedCollation来做分组和排序，也可以自定义方法进行拼音排序，但不管什么方法，要遵循section和row的角色，将同一个字母开头的数据存储到一个section中，在section中以row的字母开头进行排序，最后保存索引列表，根据TableView右侧索引添加方法进行添加设置。
