构造数组结构

- (NSMutableArray *)handleDataFrom:(NSArray *)arr{
NSString *tempString = @"";
for (NSDictionary *dic in arr) {
NSMutableDictionary *elementDic = [NSMutableDictionary dictionary];
NSMutableDictionary *tempDic = [NSMutableDictionary dictionary];
NSString *firstLetter = [[dic objectForKey:@"firstLetter"] description];
// 判断return的数组里是不是已经添加过当前遍历到的首字母
if ([tempString isEqualToString:firstLetter]) {
NSMutableDictionary *lastDic = [NSMutableDictionary dictionaryWithDictionary:[schoolArr_ lastObject]];
NSMutableArray *valueArr = [NSMutableArray arrayWithArray:[lastDic objectForKey:firstLetter]];
[tempDic setObject:[[dic objectForKey:@"id"] description] forKey:@"id"];
[tempDic setObject:[[dic objectForKey:@"name"] description] forKey:@"name"];
[valueArr addObject:tempDic];
[elementDic setObject:valueArr forKey:firstLetter];
[schoolArr_ removeLastObject];
} else {
[tempDic setObject:[[dic objectForKey:@"id"] description] forKey:@"id"];
[tempDic setObject:[[dic objectForKey:@"name"] description] forKey:@"name"];
[elementDic setObject:[NSMutableArray arrayWithObjects:tempDic, nil] forKey:firstLetter];
}
[schoolArr_ addObject:elementDic];
tempString = firstLetter;
}
NSLog(@"%@",schoolArr_);

return schoolArr_;
}

- (NSMutableArray *)handleDataFrom:(NSArray *)arr{
NSString *tempString = @"";
//    NSMutableArray *resultArr = [[NSMutableArray alloc] init];
for (NSDictionary *dic in arr) {
NSMutableArray *elementArr = [NSMutableArray array];
NSString *firstLetter = [[dic objectForKey:@"firstLetter"] description];
// 判断return的数组里是不是已经添加过当前遍历到的首字母
if ([tempString isEqualToString:firstLetter]) {
elementArr = [NSMutableArray arrayWithArray:[schoolIdArr_ lastObject]];
[elementArr addObject:[[dic objectForKey:@"id"] description]];
[schoolIdArr_ removeLastObject];
} else {
[elementArr addObject:[[dic objectForKey:@"id"] description]];
}
[schoolIdArr_ addObject:elementArr];
tempString = firstLetter;
}
return schoolIdArr_;
}