[iOS]地址排序&获取汉字首字母 例如：北京市->bjs

-(NSArray*)AZIndexDispose:(NSArray *)array{
    NSMutableArray *allArray = @[].mutableCopy;
    for (NSString  *character in  _indexArray) {
        NSMutableArray *itemArray = @[].mutableCopy;
        
        for (NSDictionary *dict in array) {
            NSString *name = [dict stringValueForKey:@"name"];
            NSString *firstStr = [self firstCharactor:name];
            if ([character isEqualToString:firstStr]) {
                [itemArray addObject:dict];
            }
        }
        [allArray addObject:itemArray];
    }
    
    return allArray;
}

- (NSString *)firstCharactor:(NSString *)aString
{
    NSMutableString *strSum = [[NSMutableString alloc]init];
    for (int i = 0 ; i < 1 ; i++) {
        //转成了可变字符串
        NSMutableString *str = [NSMutableString stringWithString:[aString substringWithRange:NSMakeRange(i, 1)]];
        NSLog(@"---%@",str);
        //先转换为带声调的拼音
        CFStringTransform((CFMutableStringRef)str,NULL, kCFStringTransformMandarinLatin,NO);
        //再转换为不带声调的拼音
        CFStringTransform((CFMutableStringRef)str,NULL, kCFStringTransformStripDiacritics,NO);
        //转化为大写拼音
        NSString *pinYin = [str lowercaseString];
        NSLog(@"---%@",pinYin);
        //获取并返回首字母
        strSum = [[NSMutableString alloc]initWithString:[strSum stringByAppendingString:[pinYin substringToIndex:1]]];
    }
    NSLog(@"拼音%@",strSum);
    return [strSum uppercaseString];
}