UILocalizedIndexedCollation可以实现区域排序，类似通讯录的样式。 //首先进行初始化
locationCollation = [UILocalizedIndexedCollation currentCollation];
//获取section标题 A-Z#
array_collation_title =[[NSMutableArray alloc]initWithArray:[locationCollation sectionTitles]];
//构建每个section数组
array_section =[[NSMutableArray alloc]init];
for (int i=; i<array_collation_title.count; i++) {
NSMutableArray *subArray = [[NSMutableArray alloc]init];
[array_section addObject:subArray];
}
//排序
//排序对象，放进分区数组中
for (Person *person in array_datas) {
NSInteger section = [locationCollation sectionForObject:person collationStringSelector:@selector(name)];
NSMutableArray *subarray =array_section[section];
[subarray addObject:person];
} //分别对分区进行排序
for (int i =;i<array_section.count;i++) {
NSMutableArray *subarray = [array_section objectAtIndex:i];
NSArray *sortArr = [locationCollation sortedArrayFromArray:subarray collationStringSelector:@selector(name)];
[array_section replaceObjectAtIndex:i withObject:sortArr];
}
#pragma mark -datasouth
//返回section 要显示的标题集合
-(NSArray<NSString *>*)sectionIndexTitlesForTableView:(UITableView *)tableView{
// return [[UILocalizedIndexedCollation currentCollation]sectionTitles];
return array_collation_title;
} //根据section 返回显示的标题
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
// return [[[UILocalizedIndexedCollation currentCollation]sectionTitles]objectAtIndex:section];
return [array_collation_title objectAtIndex:section];
} //点击右侧字母，触发此方法，告诉数据源 选中的section
-(NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index{
return [[UILocalizedIndexedCollation currentCollation]sectionForSectionIndexTitleAtIndex:index];
} -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
int count = ;
for (NSMutableArray *subArr in array_section) {
if (subArr.count>) {
count++;
}
}
return count;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
NSMutableArray *subArr = [array_section objectAtIndex:section];
return subArr.count;
} -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
if (cell==nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
}
NSMutableArray *subArray = [array_section objectAtIndex:indexPath.section];
Person *person =[subArray objectAtIndex:indexPath.row];
if (person!=nil) {
[cell.textLabel setText:person.name];
} return cell;
} -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
NSLog(@"section = %d,row = %d",indexPath.section,indexPath.row);
} -(CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section{
return ;
}
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
return ;
}
运行效果图
运行后发现 在 没有值的section下 依然显示section标题，这样会感觉非常丑。
优化一下代码，
添加以下方法
//删除没有值的subArr
for (int i =;i<array_section.count;i++) {
NSMutableArray *subarray = [array_section objectAtIndex:i];
if (subarray.count==) {
[array_section removeObjectAtIndex:i];
[array_collation_title removeObjectAtIndex:i];
i--; // 这里很重要
}
}