0

我无法让我的表格视图显示我的数据，该数组具有 NSLog 输出的有效数据。我在开头放了一个断点，tableView:cellForRowAtIndexPath:但它永远不会到达那里。任何想法为什么？ 

#import "ViewController.h"
#import "Ride.h"

@interface ViewController ()
@property (nonatomic, strong) NSMutableData *responseData;
@end

@implementation ViewController

@synthesize rideIds = _rideIds;
@synthesize rideNames = _rideNames;

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSLog(@"viewdidload");

    self.responseData = [NSMutableData data];


    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

    // http://www.strava.com/api/v1/segments/229781/efforts?best=true

    // Efforts on segment by athlete limited by startDate and endDate
    //NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.strava.com/api/v1/segments/229781/efforts?athleteId=11673&startDate=2012-02-01&endDate=2012-02-28"]];

    //Leader Board on Segment all Athletes
    //NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.strava.com/api/v1/segments/229781/efforts?best=true"]];

    //Rides by Athlete
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.strava.com/api/v1/rides?athleteId=10273"]];


    //Twitter Example
    //NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://api.twitter.com/1/trends"]];


    //Efforts by Ride
    //NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.strava.com/api/v1/rides/77563/efforts"]];

    //Effort Detail
    //NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.strava.com/api/v1/efforts/688432"]];


    //Google API Call
    //NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://maps.googleapis.com/maps/api/place/search/json?location=-33.8670522,151.1957362&radius=500&types=food&name=harbour&sensor=false&key=AIzaSyAbgGH36jnyow0MbJNP4g6INkMXqgKFfHk"]];

/*    dispatch_async(dispatch_get_main_queue(),^ {
        NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    } ); */

        NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    if(theConnection){
        self.rideIds = [[NSMutableArray alloc]init];
        self.rideNames  = [[NSMutableArray alloc] init];
    } else {
        NSLog(@"No Connection");
        }





}


//Delegate methods for the NSURLConnection

//In order to download the contents of a URL, an application needs to provide a delegate object that, at a minimum, implements the following delegate methods: connection:didReceiveResponse:, connection:didReceiveData:, connection:didFailWithError: and connectionDidFinishLoading:.

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {

    NSLog(@"didReceiveResponse");

    //This message can be sent due to server redirects, or in rare cases multi-part MIME documents.
    //Each time the delegate receives the connection:didReceiveResponse: message, it should reset any progress indication and discard all previously received data.

    [self.responseData setLength:0];
}


- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

    [self.responseData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

    NSLog(@"didFailWithError");
    NSString *errorDescription = [error description];
//    NSLog([NSString stringWithFormat:@"Connection failed: %@", errorDescription]);
    NSLog(@"Connection failed: %@", errorDescription);
}


- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    NSLog(@"connectionDidFinishLoading");
    NSLog(@"Succeeded! Received %d bytes of data",[self.responseData length]);

    // convert to JSON
    NSError *myError = nil;
    //NSDictionary *jsonRes = [NSJSONSerialization JSONObjectWithData:self.responseData options:NSJSONReadingMutableLeaves error:&myError];

    NSDictionary *jsonResult = [NSJSONSerialization JSONObjectWithData:self.responseData options:NSJSONReadingMutableLeaves error:&myError];
    NSDictionary *jsonRides =[jsonResult objectForKey:@"rides"];


    // Show all values coming out of "rides" key
    // Store ride id's and names on arrays for later display on tableview
    for (NSDictionary *rides in jsonRides) {

        [self.rideIds addObject:[rides objectForKey:@"id"]];
        NSLog(@"id = %@", [rides objectForKey:@"id"]);
        //NSLog(@"%@",self.rideIds);

        [self.rideNames addObject:[rides objectForKey:@"name"]];
        NSLog(@"name = %@", [rides objectForKey:@"name"]);
        //NSLog(@"%@",self.rideNames);
    }
        NSLog(@"%@",self.rideIds);
        NSLog(@"%@",self.rideNames);

    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

    // Show all values coming out of NSKSONSerialization
    for(id key in jsonResult) {

        id value = [jsonResult objectForKey:key];

        NSString *keyAsString = (NSString *)key;
        NSString *valueAsString = (NSString *)value;

        NSLog(@"key: %@", keyAsString);
        NSLog(@"value: %@", valueAsString);
    }

    // extract specific value...
    // NSArray *results = [res objectForKey:@"results"];
    /*NSArray *results = [res objectForKey:@"rides"];
    for (NSDictionary *result in results) {
        NSData *athleteData = [result objectForKey:@"name"];
        NSLog(@"Ride name: %@", athleteData);
    }*/


/*    dispatch_async(dispatch_get_main_queue(),^ {
        [self.rideTableView reloadData];
    } ); */

    [self.rideTableView reloadData];


}



- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    NSLog(@"tableView:numberOfRowsInSection: ");

    //return self.rideIds.count;
    NSLog(@"%u",self.rideNames.count);
    return 3;
}


- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    NSLog(@"tableView:cellForRowAtIndexPath: ");


    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if( nil == cell ) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    cell.textLabel.text= [self.rideNames objectAtIndex:indexPath.row];
    return cell;
}


- (void)tableView:(UITableView *)tv
didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tv deselectRowAtIndexPath:indexPath animated:YES];
}



@end

NSLog内容：

2012-08-18 18:47:29.497 WebServiceCall[10387:c07] viewdidload
2012-08-18 18:47:29.503 WebServiceCall[10387:c07] tableView:numberOfRowsInSection: 
2012-08-18 18:47:29.503 WebServiceCall[10387:c07] 0
2012-08-18 18:47:29.504 WebServiceCall[10387:c07] tableView:cellForRowAtIndexPath: 
2012-08-18 18:47:29.506 WebServiceCall[10387:c07] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'
*** First throw call stack:
(0x14b6022 0xeb6cd6 0x14a2d88 0x395d 0xb3c54 0xb43ce 0x9fcbd 0xae6f1 0x57d42 0x14b7e42 0x1d87679 0x1d91579 0x1d164f7 0x1d183f6 0x1da5160 0x17e84 0x18767 0x27183 0x27c38 0x1b634 0x13a0ef5 0x148a195 0x13eeff2 0x13ed8da 0x13ecd84 0x13ecc9b 0x17c65 0x19626 0x22fd 0x2265 0x1)
terminate called throwing an exception(lldb)

更新：似乎在通过 viewDidLoad 之后，它会直接跳入tableview:numberOfRowsInSection跳过所有 4 种处理方法的方法NSURLConnection（我更新了我的数组）。

我的视图控制器既是我的代表，也是NSURLConnection我的tableView. 似乎它首先运行的是 tableView 方法。关于如何使其首先运行NSURLConnection方法的任何建议？

4

2 回答 2

0

在哪里tableView:numberOfSectionsInTableView:？也许那是返回0尽管如果未设置默认值为1 ；您还需要在您的 tableView 上设置delegate和。dataSource

于 2012-08-18T22:18:14.787 回答
0

您可以尝试两件事 - 首先，在您的 numberOfRowsInSection 方法中记录 self.rideIds.count 以确保它不返回 0。其次，在您的 connectionDidFinishLoading 方法结束时，放入 [tableView reloadData] （或任何出口到你的表视图是），这应该解决在连接完成之前调用表视图方法的问题。

编辑后：错误“-[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array”是由 numberOfRowsInSection 方法中的“return 3”引起的。当应用程序启动时，表格视图将尝试在您的连接返回任何结果之前自行填充，因此 numberOfRowsInSection 第一次应该返回 0 而不是 3，如果您放回 return self.rideIds.count 行，它将执行此操作。如果您在连接委托方法的末尾执行 reloadData，则将填充数组并且表格视图应该正常工作。

于 2012-08-19T01:17:14.560 回答