NSMutable Array中的JSON數據超出範圍，tableView將不會顯示cellData

Question

所以我正在研究解析json並嘗試將結果放入純UITableview的iphone應用程序。我在xib文件中有我的tableview設置，並且還將數據源和委託設置爲MainViewController（這是實用程序應用程序）。我得到的JSON請求很好，我總是通過輸出到文本標籤來測試。但是，當我調試並將鼠標懸停在cellData var（包含此數據）上時，它顯示超出範圍，並且我的模擬器顯示一個不會滾動的空表...就像它等待某些事情完成一樣。

這裏是我的視圖控制器頭：

#import "FlipsideViewController.h" 

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate,  UITableViewDelegate, UITableViewDataSource> { 
IBOutlet UILabel *label; 
UITableView *theTableView; 
NSMutableArray *cellData; 

} 
@property (nonatomic, retain) IBOutlet UILabel *label; 
@property (retain) NSMutableArray *cellData; 
- (IBAction)showInfo:(id)sender; 

@end 

，這裏是我的實現：

#import "MainViewController.h" 
#import "JSON.h" 


@implementation MainViewController 
@synthesize label; 
@synthesize cellData; 
//Begin code for Table View Data Source (required methods) 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
{ 
    return 1; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
    //how many rows in the section; for testing purposes...placed here 
    return [cellData count]; 
    //return 20; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    //create a cell 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"]; 
    if(cell == nil) 
    { 
     cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];  
    } 

    //fill it with contents 
    cell.textLabel.text = [cellData objectAtIndex:indexPath.row]; 
    //return it 
    return cell; 
} 

//End code for Table View Data Source 

//Begin code for JSON stuffs 

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib. 
- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    //TODO: need to extract this code out to a function because need to make multiple requests per run of the app.... 
    //responseData = [[NSMutableData data] retain]; 
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"https://tabular.heroku.com/tab_stores/tester.json"]]; 
    [[NSURLConnection alloc] initWithRequest:request delegate:self]; 
    cellData = [[NSMutableArray alloc] init]; 
} 

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

    NSMutableData *mutData = [[NSMutableData alloc] init]; 
    [mutData appendData:data]; 

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

    NSArray *responseData = [responseString JSONValue]; 

    NSMutableString *text = [NSMutableString stringWithString:@"T:"]; 

    for (int i = 0; i < [responseData count]; i++) 
     [text appendFormat:@"%@\n", [responseData objectAtIndex:i]]; 

    label.text = text; 

    NSLog(@"%@\n", cellData); 
    //Let's parse the data the way its supposed to be 

    //for every window, there should be a section. 
    for (int i=0; i<[responseData count]; i++) { 
     //manage table section 
     //maybe print window 1 

    } 


    //[cellData addObject:[responseData objectAtIndex:0]]; 
    [cellData addObjectsFromArray:responseData]; 
// [responseData release]; 
    NSLog(@"%@\n", cellData); 


    [theTableView reloadData]; 

    [responseString release]; 
    [mutData release]; 
} 

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error 
{ 
    label.text = [NSString stringWithFormat:@"Connection failed: %@", [error description]]; 
} 

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    [connection release]; 

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

    //[responseData release]; 

    //cellData = [responseString JSONValue]; 

    //NSLog(@"this is in tabs %@", tabs); 
// NSLog(@"this is in cellData %@", cellData); 
//  NSLog(@"this is in cellDatas %@", cellDatas); 

    //NSMutableString *text = [NSMutableString stringWithString:@"T:"]; 

// for (int i = 0; i < [cellDatas count]; i++) 
//  [text appendFormat:@"%@\n", [cellDatas objectAtIndex:i]]; 

// label.text = text; 

    //[theTableView reloadData]; 
} 


//End code for JSON stuffs 

. 
. 
. 

- (void)dealloc 
{ 
    [theTableView release]; 
//[cellData release]; 
    [super dealloc]; 
} 

我知道的tableview的sectionsiInTableView和numberOfRowsInSection調用數這些函數第一所以它將不會得到數據，但後來我認爲調用reloadData會工作......但沒有。任何人都可以幫助新手出去嗎？在控制檯

* NSLogs：

2010-08-15 15:42:07.421 Tabular[33046:207] (
) 
2010-08-15 15:42:09.902 Tabular[33046:207] (
    (
      (
     Google, 
     "https://www.google.com/" 
    ), 
      (
     "https://tabular.heroku.com/tab_stores/tester", 
     "https://tabular.heroku.com/tab_stores/tester" 
    ), 
      (
     "test - Google Search", 
     "http://www.google.com/search?client=safari&rls=en&q=test&ie=UTF-8&oe=UTF-8" 
    ), 
      (
     "Using POST method in XMLHTTPRequest(Ajax)", 
     "http://www.openjs.com/articles/ajax_xmlhttp_using_post.php" 
    ), 
      (
     "json stringify - Google Search", 
     "http://www.google.com/search?client=safari&rls=en&q=json stringify&ie=UTF-8&oe=UTF-8" 
    ), 
      (
     "json.stringify escape - Google Search", 
     "http://www.google.com/search?q=json.stringify escape&hl=en&safe=off&client=safari&rls=en&ei=PUlaTNiYL4O78gbt8bXsAg&start=10&sa=N" 
    ) 
), 
    (
      (
     Google, 
     "https://www.google.com/" 
    ) 
) 
) 

Answer 1

• 它看起來像在cellData每個項目本身是另一個數組。它不是NSString，因此將其分配給文本字段的「文本」不太可能奏效（我很驚訝它不會崩潰）。如有疑問，請撥打[obj description]，這應該返回一個NSString。
• connection:didReceiveData:可以每個連接多次調用。您的註釋代碼在正確的軌道上（緩衝所有數據一次，並處理所有內容，如connectionDidFinishLoading:;或者，如果您有一個API，則使用基於流的API進行處理;我不認爲您使用的JSON庫支持） 。
• 你好奇地製作一個可變的數據副本，但不要改變它。