int main(int argc, const char * argv[]) {

    @autoreleasepool {

        //字符串进行排序

        NSArray *arr=@[@"b",@"a",@"c"];

        NSSortDescriptor *ns=[NSSortDescriptor sortDescriptorWithKey:nil ascending:YES];

        NSArray *B=[arr sortedArrayUsingDescriptors:@[ns]];

        NSLog(@"%@",B);

        //代码块排序

      NSArray *a=  [arr sortedArrayUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {

            return [obj1 compare:obj2];

      }];

        NSLog(@"%@",a);

        //选择器排序

        NSArray *C=[arr sortedArrayUsingSelector:@selector(compare:)];

        NSLog(@"%@",C);

    }

    return ;

}

   //可变集合的排序

        NSMutableArray *arr=[NSMutableArray array];

        [arr addObject:@"v"];

        [arr addObject:@"b"];

        [arr addObject:@"A"];

        //选择器排序

        [arr sortUsingSelector:@selector(compare:)];

        NSLog(@"%@",arr);

        //代码块排序

        [arr sortUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {

            return [obj1 compare:obj2];

        }];

        NSLog(@"%@",arr);

        //描述信息排序

        NSSortDescriptor *nsSort=[NSSortDescriptor sortDescriptorWithKey:nil ascending:YES];

        [arr sortUsingDescriptors:@[nsSort]];

        NSLog(@"%@",arr);