Question

所以我正在开发一个解析json并尝试将结果放入普通UITableview的iphone应用程序。我在xib文件中设置了tableview设置，并将数据源和委托设置为MainViewController（这是实用程序应用程序）。我得到JSON请求就好了，我总是通过将它输出到文本标签来测试它。但是当我调试并将鼠标悬停在cellData var（包含此数据）上时，它显示超出范围，并且我的模拟器显示一个不会滚动的空表...就像它等待某些东西完成一样。

以下是我对视图控制器的标题：

#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

这是我的实施：

#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tableview首先调用了sectionInInTableView和numberOfRowsInSection的那些函数，所以它不会获取数据，但后来我认为调用reloadData会起作用......但没有。任何人都可以帮助新手吗？

* NSLogs在控制台中：

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

看起来cellData中的每个项目本身就是另一个数组。它不是一个NSString，所以将它分配给文本字段的“文本”是不可能的（我很惊讶它没有崩溃）。如有疑问，请调用[obj description]，它应返回NSString。
connection:didReceiveData:。您注释掉的代码在正确的轨道上（缓冲所有数据一次并处理connectionDidFinishLoading:中的所有内容;或者，如果您有一个基于流的API处理它;我不认为JSON库是您的使用支持）。
你好奇地制作了一个可变的数据副本，但之后不要改变它。

NSMutableArray中的JSON数据超出范围，表View不显示单元格数据

1 个答案: