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我有一个问题，我的tableview。我试图制作一个程序，从我的数据库下载作业细节并列出它们。 tableview仍然是空白的，视图连接到特定的控制器，并且我已经检查过JSON提要和单元格标识符是否正确。我的单元格行也很奇怪，虽然我已经正确地对齐tableview对象，但行线仍然在右边。我以前的项目有类似的问题，但不知道什么是错的。表视图仍然空白？
下面是代码的一部分（资料来源：http://codewithchris.com/iphone-app-connect-to-mysql-database/）
JobViewer.m
@interface JobViewer()
{
NSMutableData *_downloadedData;
}
@end
@implementation JobViewer
- (void)downloadItems
{
// Getting json file
NSURL *jsonFileURL = [NSURL URLWithString:@"here is my correct URL"];
//Making request
NSURLRequest *urlRequest = [[NSURLRequest alloc] initWithURL:jsonFileURL];
//Creating NSURLConnection with the request
[NSURLConnection connectionWithRequest:urlRequest delegate:self];
}
#pragma mark NSURLConnectionDataProtocol Methods
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
//Initialize data
_downloadedData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
//Append the data that was downloaded
[_downloadedData appendData:data];
}
- (void)connectionDidFinishDownloading:(NSURLConnection *)connection
{
//Creating array for the information
NSMutableArray *_jobs = [[NSMutableArray alloc] init];
// Parsing the JSON file
NSError *error;
NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:_downloadedData options:NSJSONReadingAllowFragments error:&error];
//Looping through JSON objects and storing them into array
for (int i = 0; i < jsonArray.count; i++)
{
NSDictionary *jsonObject = jsonArray[i];
//Creating a new object and getting data from JSON element
Job *newJob = [[Job alloc] init];
newJob.jobid = jsonObject[@"Job_id"];
newJob.companyid = jsonObject[@"Company_id"];
newJob.customer = jsonObject[@"Customer"];
newJob.phone = jsonObject[@"Phone"];
newJob.email = jsonObject[@"Email"];
newJob.address = jsonObject[@"Address"];
newJob.city = jsonObject[@"City"];
newJob.header = jsonObject[@"Header"];
newJob.notes = jsonObject[@"Notes"];
newJob.date = jsonObject[@"Date"];
newJob.driver = jsonObject[@"Driver"];
//Added question to array
[_jobs addObject:newJob];
}
// Passing the done data and passing items back
if (self.delegate)
{
[self.delegate itemsDownloaded:_jobs];
}
}
@end
MainViewController.m
@interface MainViewController()
{
JobViewer *_jobViewer;
NSArray *_listObjects;
}
@end
@implementation MainViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.mainList.delegate = self;
self.mainList.dataSource = self;
_listObjects = [[NSArray alloc] init];
_jobViewer = [[JobViewer alloc] init];
_jobViewer.delegate = self;
[_jobViewer downloadItems];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)itemsDownloaded:(NSArray *)items
{
_listObjects = items;
[self.mainList reloadData];
}
#pragma mark Table View Delegate Methods
// You may remove this method
- (NSInteger) numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return _listObjects.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *cellIdentifier = @"InfoCell";
UITableViewCell *newCell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
Job *item = _listObjects[indexPath.row];
newCell.textLabel.text = item.address;
//[newCell setBackgroundColor:[UIColor blackColor]];
return newCell;
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
“行线继续在右边”这很有意思;那是什么意思？我不知道你认为“排队”是什么;你可以发布图片并提供链接吗？ – matt 2014-10-11 17:05:19
嗨！这可能只是我的英语不好，但这里是“行”的图片：http://jessetakkinen.kapsi.fi/public_html/rows.png – 2014-10-11 17:16:35
一般来说，我NSLog数据并硬编码一个字典输出的第一行让我了解dfmuir提到的问题。 – timpone 2014-10-11 17:38:05