ios开发,网络请求获取的json数据解析之后赋值给数组变量，然后返回数组

Question

如题，返回的时候数组变空，赋值的时候还是有值的
请问大神是什么原因导致赋值之后的list变成nil，应该怎么去修改 ？？？在线等，谢谢

@interface ViewController ()<UITableViewDataSource>

@property(nonatomic,strong) NSArray *list;

@end
 - (NSArray *)list{

    if (_list == nil) {

        NSMutableDictionary *dict = @{@"key":txtKey.text}.mutableCopy;
        NSString *url = [NSString stringWithFormat:@"http://192.168.59.133:8080/api/v1/getList"];

        [[NetworkHelper sharedNewtWorkHelper] GETRequestWithUrl:url paramaters:dict successBlock:^(id object, NSURLResponse *response) {

            NSLog(@"网络请求成功:%@ %@",object,[NSThread currentThread]);
            NSArray * dictArray = [object objectForKey:@"List"];

            NSMutableArray *tempArray = [NSMutableArray array];
            for (NSDictionary *dict in dictArray) {
                cc *cc = [cc listWithDict:dict];
                [tempArray addObject:cc];
            }
            dispatch_async(dispatch_get_main_queue(), ^{
                _list = tempArray;
            });
        } FailBlock:^(NSError *error) {
            NSLog(@"网络请求失败");
        }];
    }
    return _list;
}

Answer 1

list直接用addObject插入元素。或用mutablecopy