Question

这是我的数组

@property (nonatomic, strong) NSMutableArray *searchResults;

我在viewDidLoad函数中初始化它。我想在搜索栏中的当前输入更改时从此数组中删除所有对象，并使用新元素添加填充它。但是当我做的时候

[self.searchResults removeAllObjects];

它不会添加新元素。将数组返回self.searchResults

也是如此

但是当我不从数组中删除元素并附加元素时，它会添加没有问题的元素。我真的很难搞清楚什么是错的。

viewDidLoad func

- (void) viewDidLoad {
[super viewDidLoad];
self.searchBar.delegate = self;
self.searchBar.showsCancelButton = YES;
self.tableView.delegate = self;
self.tableView.dataSource = self;
self.searchResults = [[NSMutableArray alloc] init];
[self searchHandler:self.searchBar];
}

这里是添加新元素。

- (NSMutableArray *)getProductList: (NSString *)text withArray: (NSMutableArray *) arrayResult{
[self.searchResults removeAllObjects];
[manager POST:url parameters:parameter
        success:^(AFHTTPRequestOperation *operation, id responseObject){
            NSLog(@"Length: %lu", (unsigned long)[responseObject count]);
            int length = [responseObject count];
            NSString *key;
            for (int i=0; i<length; i++) {
                key = [NSString stringWithFormat:@"%d", i];
                [self.searchResults addObject:responseObject[key]];
            }
        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            NSLog(@"Error: %@", error);
        }];
}

检查数组

- (void)searchBar:(UISearchBar *)theSearchBar textDidChange:(NSString *)searchText {
    NSLog(@"changed text: %@", searchText);
    //[searchResults removeAllObjects];
    self.searchResults = [self getProductList:searchText withArray:self.searchResults];
    NSLog(@"Length of current array: %lu", (unsigned long)[self.searchResults count]);
    for (NSString *item in self.searchResults) {
        NSLog(@"%@", item);
    }
    [self.tableView reloadData];
 }

Answer 1

您设置了searchResults

  self.searchResults = [self getProductList:searchText withArray:self.searchResults];

但是getProductList没有返回数组。你得到警告吗？如果没有，我怀疑你只是在返回时将其设置为nil

此外，getProductList是异步的，但您只是在返回时尝试加载表数据。

做一些更像这样的事情：

- (NSMutableArray *)getProductList: (NSString *)text withArray: (NSMutableArray *) arrayResult{
[self.searchResults removeAllObjects];
[manager POST:url parameters:parameter
        success:^(AFHTTPRequestOperation *operation, id responseObject){
            NSLog(@"Length: %lu", (unsigned long)[responseObject count]);
            int length = [responseObject count];
            NSString *key;
            for (int i=0; i<length; i++) {
                key = [NSString stringWithFormat:@"%d", i];
                [self.searchResults addObject:responseObject[key]];
            }

            [self.tableView reloadData];

        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            NSLog(@"Error: %@", error);
        }];
}


- (void)searchBar:(UISearchBar *)theSearchBar textDidChange:(NSString *)searchText {
  [self getProductList:searchText withArray:self.searchResults];    
}

这应该被清理得更多（删除withArray参数 - 你甚至不用它）。

此时请确保self.searchResults不是零。

删除所有对象后，不会将新对象添加到数组中

1 个答案: