LazyTableImages for iPhone示例代碼重新加載問題

Question

我正在使用LazyTableImages示例代碼在RSS表中異步加載來自RSS提要的表格視圖中的圖像。我想知道的是，一旦添加了一個新項目後，如何重新加載（重新開始解析操作），這個例子是特定的？

http://developer.apple.com/library/ios/#samplecode/LazyTableImages/Introduction/Intro.html

千恩萬謝。

Answer 1

我認爲你需要再次請求下載。你可能要添加到LazyTableAppDelegate的新方法，做這一點，因爲這是該做的初始下載類：

- (void)reloadAppList 
{ 
    NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:TopPaidAppsFeed]]; 
    self.appListFeedConnection = [[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self] autorelease]; 
} 

此外，修改 - [LazyTableAppDelegate handleLoadedApps：]清除舊的數據，這樣的：

- (void)handleLoadedApps:(NSArray *)loadedApps 
{ 
    [self.appRecords removeAllObjects]; 
    rootViewController.entries = [NSArray array]; 
    [self.appRecords addObjectsFromArray:loadedApps]; 

    // tell our table view to reload its data, now that parsing has completed 
    [rootViewController.tableView reloadData]; 
} 

我還沒有嘗試過這個，但這是基本的想法。

Answer 2

（無法找到一個方法來評論...）

我在這裏有同樣的問題，並試圖這種方法。使用removeAllObjects清除appRecords，但第二次，所有作品的文章，但圖標不加載。

可以通過改變原始樣品代碼這樣重現問題：

- (void)applicationDidFinishLaunching:(UIApplication *)application 

{ //配置和顯示窗口 [窗口addSubview：[self.navigationController視圖]]; [window makeKeyAndVisible];

// Initialize the array of app records and pass a reference to that list to our root view controller 
self.appRecords = [NSMutableArray array]; 
rootViewController.entries = self.appRecords; 

//的NSURLRequest *的URLRequest = [的NSURLRequest requestWithURL：[NSURL URLWithString：TopPaidAppsFeed]]; //self.appListFeedConnection = [[[NSURLConnection alloc] initWithRequest：urlRequest delegate：self] autorelease];

// Test the validity of the connection object. The most likely reason for the connection object 
// to be nil is a malformed URL, which is a programmatic error easily detected during development 
// If the URL is more dynamic, then you should implement a more flexible validation technique, and 
// be able to both recover from errors and communicate problems to the user in an unobtrusive manner. 
// 
//NSAssert(self.appListFeedConnection != nil, @"Failure to create URL connection."); 

// show in the status bar that network activity is starting 
// [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 
[self reloadData]; 

}

• （IBAction爲）的重載：（ID）發送方{ [自reloadData]; }

- （無效）reloadData { 的NSLog（@ 「更新條目」）; [self.appRecords removeAllObjects]; // [[myTableViewController imageDownloadsInProgress] removeAllObjects];

NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:TopPaidAppsFeed]]; 
self.appListFeedConnection = [[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self] autorelease]; 

// Test the validity of the connection object. The most likely reason for the connection object 
// to be nil is a malformed URL, which is a programmatic error easily detected during development 
// If the URL is more dynamic, then you should implement a more flexible validation technique, and 
// be able to both recover from errors and communicate problems to the user in an unobtrusive manner. 
// 
NSAssert(self.appListFeedConnection != nil, @"Failure to create URL connection."); 

// show in the status bar that network activity is starting 
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 

}