我正在创建一个应用程序，它从服务器获取 JSON 文本并将其转换为机器人锦标赛的比赛时间表。我有自定义单元格，其中填充了我从网站接收到的数据，它们显示每个单独匹配的数据就好了。问题是，当我将匹配项放入 .plist 文件（“data.plist”）时，一旦最初建立了互联网连接，一旦应用程序按顺序被终止，用户就不一定需要重新连接到互联网查看当天的比赛日程。在我没有连接到互联网之前，我的代码运行良好。出于某种原因，一旦互联网连接失败，该应用程序永远不会进入创建单元的功能。请帮忙！！这是我的代码：
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
aRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://jrl.teamdriven.us/source/scripts/getElimMatchResultsJSON.php"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15.0];
aConnection = [[NSURLConnection alloc] initWithRequest:aRequest delegate:self];
if(aConnection){
receivedData = [NSMutableData data];
}
else{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Connection!!" message:nil delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
}
paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
jrlDirectory = [paths objectAtIndex:0];
path = [jrlDirectory stringByAppendingPathComponent:@"data.plist"];
if (![[NSFileManager defaultManager] fileExistsAtPath:@"data.plist"]) {
[[NSFileManager defaultManager] copyItemAtPath:[[NSBundle mainBundle]pathForResource:@"data" ofType:@"plist"] toPath:path error:nil];
}
dataDict = [[NSMutableDictionary alloc] initWithContentsOfFile:path];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
// Prevents data from repeating itself
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
[receivedData appendData: data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Connection Failed" message:nil delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
NSLog(@"Connection failed! Error - %@ %@", [error localizedDescription], [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
NSLog(@"Success! Received %d bits of data", [receivedData length]);
// Must allocate and initialize all mutable arrays before changing them
sweet16 = [[NSMutableArray alloc]init];
quarterfinals = [[NSMutableArray alloc]init];
semi = [[NSMutableArray alloc]init];
finals = [[NSMutableArray alloc]init];
dict = [[NSMutableDictionary alloc]init];
// The error is created and can be referred to if the code screws up (example in the "if(dict)" loop)
NSError *error;
dict = [NSJSONSerialization JSONObjectWithData:receivedData options:NSJSONReadingMutableLeaves error:&error];
matchNames = [[dict objectForKey:@"ElimMatchListResults"]allKeys];
matchNames = [matchNames sortedArrayUsingSelector:@selector(compare:)];
// Categorize the matches based on the first two letters of their match names
for (NSString *name in matchNames) {
if([[name substringToIndex:2]isEqual:@"16"]){
[sweet16 insertObject:[[dict objectForKey:@"ElimMatchListResults"] objectForKey:name] atIndex:sweet16.count];
}
else if([[name substringToIndex:2]isEqual:@"Q."]){
[quarterfinals insertObject:[[dict objectForKey:@"ElimMatchListResults"]objectForKey:name] atIndex:quarterfinals.count];
}
else if([[name substringToIndex:2]isEqual:@"S."]){
[semi insertObject:[[dict objectForKey:@"ElimMatchListResults"]objectForKey:name] atIndex:semi.count];
}
else if([[name substringToIndex:2]isEqual:@"F."]){
[finals insertObject:[[dict objectForKey:@"ElimMatchListResults"]objectForKey:name] atIndex:finals.count];
}
}
headers = [NSArray arrayWithObjects:@"Sweet 16", @"Quarterfinals", @"Semifinals", @"Finals", nil];
sections = [NSArray arrayWithObjects:sweet16, quarterfinals, semi, finals, nil];
// If the dictionary "dict" gets filled with data...
if (dict) {
[[self tableView]setDelegate:self];
[[self tableView]setDataSource:self];
// Now uses data storage so that the user only needs to initially connect to the internet and then they can keep the schedule afterwords
[dataDict setObject: [NSDictionary dictionaryWithObjectsAndKeys:
[NSArray arrayWithArray:sections], @"sections",
[NSArray arrayWithArray:headers], @"headers",
nil]
forKey:@"Matches"];
[dataDict writeToFile:path atomically:YES];
}
else{
NSLog(@"%@", error);
}
}
// Set the number of sections based on how many arrays the sections array has within it
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return [[[dataDict objectForKey:@"Matches"] objectForKey:@"sections"] count];
}
// Set the number of rows in each individual section based on the amount of objects in each array
// within the sections array
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return [[[[dataDict objectForKey:@"Matches"] objectForKey:@"sections"] objectAtIndex:section] count];
}
// Set headers of sections from the "headers" array
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
return [[[dataDict objectForKey:@"Matches"] objectForKey:@"headers"] objectAtIndex:section];
}
// Create cells as the user scrolls
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
NSLog(@"Entered Final Loop");
static NSString *cellIdentifier = @"Cell";
CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(!cell){
cell = [[CustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
cell.matchNum.text = [[[[[dataDict objectForKey:@"Matches"] objectForKey:@"sections"] objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"MatchID"];
cell.red1.text = [NSString stringWithFormat:@"%@",[[[[[dataDict objectForKey:@"Matches"] objectForKey:@"sections"] objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"Red 1"]];
cell.red2.text = [NSString stringWithFormat:@"%@",[[[[[dataDict objectForKey:@"Matches"] objectForKey:@"sections"] objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"Red 2"]];
cell.redScore.text = [NSString stringWithFormat:@"%@", [[[[[dataDict objectForKey:@"Matches"] objectForKey:@"sections"] objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"Red Score"]];
cell.blue1.text = [NSString stringWithFormat:@"%@",[[[[[dataDict objectForKey:@"Matches"] objectForKey:@"sections"] objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"Blue 1"]];
cell.blue2.text = [NSString stringWithFormat:@"%@",[[[[[dataDict objectForKey:@"Matches"] objectForKey:@"sections"] objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"Blue 2"]];
cell.bluescore.text = [NSString stringWithFormat:@"%@", [[[[[dataDict objectForKey:@"Matches"] objectForKey:@"sections"] objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"Blue Score"]];
return cell;
}
我为冗长的代码道歉，我只是想确保我得到了所有的细节。请提出任何你需要澄清的问题，我现在真的很困惑，为什么它永远不会进入如果没有互联网连接，则创建单元格的功能。