Question

大家好，

这是我的第一篇帖子，这是我的问题：我试图从REST API调用中获取一些数据，然后在UITableView中显示。

这就是我在做的事情：

在viewDidLoad中：1）这里我初始化我的 things 数组以显示在表中（在开头是空的）2）表被加载（有0行）和3）然后发出HTTP异步调用。

完成这个我用HTTP响应做我的东西，准备好后我在我的桌子上调用reloadData。奇怪的发生在这里。

numberOfRowsInSelection返回正确的行数但 tableView：cellForRowAtIndexPath：indexPath.row的indexPath总是返回零！所以没有新的行添加到表中。

  - (void)doJSONRequest{
    responseData = [[NSMutableData data] retain];

    NSString *addr = [[NSString alloc] initWithFormat:@"http://localhost:8080/blabla/v1/items?count=10"];
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:addr]];

    [[NSURLConnection alloc] initWithRequest:request delegate:self];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    [addr release];
}

- (void)doJSONRequestWithURL:(NSString *)url{
    responseData = [[NSMutableData data] retain];

    NSString *addr = [[NSString alloc] initWithFormat:url];
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:addr]];

    [[NSURLConnection alloc] initWithRequest:request delegate:self];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    [addr release];
}


- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    //NSLog(@"[%@] connection:didReceiveResponse %@",[self class], response);
    [responseData setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    //NSLog(@"[%@] connection:didReceiveData %@",[self class], data);
    [responseData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    NSLog(@"[%@]",[NSString stringWithFormat:@"Connection failed: %@", [error description]]);
    UIAlertView *alert = [[UIAlertView alloc] init];
    [alert setTitle:@"NETWORK ERROR!"];
    [alert setMessage:@"App will close"];
    [alert setDelegate:self];
    [alert addButtonWithTitle:@"Close"];
    [alert show];
    [alert release];
    [alert show];
    [alert release];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {  
    //NSLog(@"[%@] connectionDidFinishLoading %@",[self class], connection);
    [connection release];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    [responseData release];

    NSDictionary *res = [NSDictionary dictionaryWithDictionary:[responseString JSONValue]];

    NSDictionary *tmp = [res valueForKey:@"reviews"];
    tmp = [tmp valueForKey:@"reviews"];
    NSEnumerator *e = [tmp objectEnumerator];
    NSDictionary *tmp_review;

    int i=0;
    while (tmp_review = [e nextObject]) {
        //NSLog(@"tmp_review %@", tmp_review);
        //NSLog(@"count %d", i++);

            MyObject r = [... doing my staff...]
        [reviews addObject: r];
        [r release];
    };
    [reviewListTableView reloadData];
    [responseString release];

}

- (void)viewDidLoad {
//- (void)initUI {

    //review is the array where I put my data
    //it is empty at the beginning
    reviews = [[NSMutableArray alloc] initWithObjects:nil];
    [super viewDidLoad];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [reviews count] 
}

Answer 1

听起来您可能没有正确实施numberOfSectionsInTableView:。您应该在indexPath.section中记录tableView:cellForRowAtIndexPath:indexPath，以查看您要传递的部分值。您将有多个indexPath.row值为零，因为每个部分都有一个零行。

Answer 2

在数组中添加新对象和[mytableview reloadData];

Answer 3

在表格视图中实现以下数据源返回部分的编号。

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView;

在tableView：cellForRowAtIndexPath：indexPath检查部分编号并执行操作。

注意：如果您不需要部分，可以将其删除。

在UITableView中添加新行

3 个答案: