iOS仿微信联系人界面中联系人按姓名首字母分类UILocalizedIndexedCollation

来源：互联网发布：初中物理知识网络编辑：程序博客网时间：2024/04/30 03:45
字母分组排序神器：UILocalizedIndexedCollation
- (void)configureTableViewSection {        // 实例化    UILocalizedIndexedCollation *collation = [UILocalizedIndexedCollation currentCollation];        // [collation sectionTitles]得到一个包含(A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,#)的数组    // numberOfSections为27    NSUInteger numberOfSections = [[collation sectionTitles] count];        // 初始化一个sectionMutableArray来存放数据，其27个元素都是NSMutableArray    NSMutableArray *sectionMutableArray =  [[NSMutableArray alloc] init];    for (NSUInteger index = 0; index < numberOfSections; index ++) {        [sectionMutableArray addObject:[[NSMutableArray alloc] init]];    }        /*     * 假设现在有个一个数据模型DataModel类，DataModel类里面有字段nameStr、avatarStr，生成若干DataModel的实例已经加入到了数组(NSMutableArray)dataMutableArray中     */    for (DataModel *oneDataModel in dataMutableArray) {        // 获取nameStr首字母所在的位置        NSUInteger sectionIndex = [collation sectionForObject:oneDataModel collationStringSelector:@selector(nameStr)];        [sectionMutableArray[sectionIndex] addObject:oneDataModel];    }        // 对分成一类的数组进行排序    for (NSUInteger index = 0; index < numberOfSections; index ++) {        // 获取某一字母分类中得数组        NSMutableArray *indexSectionMutableArray = sectionMutableArray[index];        // 以nameStr字段排序        NSArray *sortedSectionArray = [collation sortedArrayFromArray:indexSectionMutableArray collationStringSelector:@selector(nameStr)];        sectionMutableArray[index] = sortedSectionArray;    }        NSMutableArray *emptyMutableArray = [NSMutableArray new];    NSMutableArray *sectionTitleMutableArray = [NSMutableArray new];        [sectionMutableArray enumerateObjectsUsingBlock:^(NSArray *arrary, NSUInteger idx, BOOL *stop) {                if (arrary.count == 0) {            // 可能有很多arrary.count为0的，把这些arrary加到emptyMutableArray里，然后从sectionMutableArray里移除            [emptyMutableArray addObject:arrary];        }        else {            // section标题，如A，B，C...            [sectionTitleMutableArray addObject:[collation sectionTitles][idx]];        }    }];        [sectionMutableArray removeObjectsInArray:emptyMutableArray];        NSMutableArray *showMutableArray = [[NSMutableArray alloc] init];    // 自己加图片    NSArray *dictArray = @[@{@"nameStr": @"新的朋友", @"imageNameStr": @""},                         @{@"nameStr": @"群聊", @"imageNameStr": @""},                         @{@"nameStr": @"标签", @"imageNameStr": @""},                         @{@"nameStr": @"公众号", @"imageNameStr": @""}];        for (NSDictionary *oneDict in dictArray) {        /*         * 假设现在有个一个数据模型ShowModel类，ShowModel类里面有字段nameStr、imageNameStr         */        ShowModel *showModel = [ShowModel new];        showModel.nameStr = oneDict[@"nameStr"];        showModel.imageNameStr = oneDict[@"imageNameStr"];                [showMutableArray addObject:showModel];    }        // 第一个section显示自定义的    [sectionMutableArray insertObject:showMutableArray atIndex:0];    // sectionTitleMutableArray存放的是section的标题A，B，C...，第一个section不需要section title    [sectionTitleMutableArray insertObject:@"" atIndex:0];        // 把sectionMutableArray、sectionTitleMutableArray全局化，作为tableView的数据源    self.sectionMutableArray = sectionMutableArray;    self.sectionTitleMutableArray = sectionTitleMutableArray;}
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