[英]NSOperationQueue Implemetation
在加載一些數據時,我已經顯示了帶有“ Please Wait”文本的UIAlertView
,以使用戶知道正在處理某些內容。
所以我將UIAlertView
隱藏在-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath函數中,如下所示
因此,現在我需要知道的是我是否以正確的方式處理NSOperationQueue
? 還是我在使用NSOperationQueue
時缺少任何東西
這是我的代碼。 請讓我知道你的想法。
謝謝
-(void)buttonPressed
{
alertLoading =[[UIAlertView alloc] initWithTitle:@"Loading Data" message:@"Please wait..." delegate:self cancelButtonTitle:nil otherButtonTitles:nil];
av=[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
[av startAnimating];
[av setFrame:CGRectMake(125, 70, 37, 37)];
//[self.view addSubview:alertLoading];
[alertLoading show];
[alertLoading addSubview:av];
[av release];
NSOperationQueue *queue = [NSOperationQueue new];
NSInvocationOperation *operation = [[NSInvocationOperation alloc]
initWithTarget:self
selector:@selector(parsing)
object:nil];
[queue addOperation:operation];
[operation release];
[queue release];
}
-(void)parsing
{
NSString *searchUrl = [NSString stringWithFormat:@"%@profile.php?type=list&logged_id=%@&start=%d& rows=%d",ConstantURL,Reg_UserId_Trim,row_index,per_page];
NSURL *xmlURL = [NSURL URLWithString:searchUrl];
NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL];
parserXML =[[XMLParser alloc]initXMLParser];
profileName = [[ProfileName alloc]init];
myProfileParser =[[MyProfileParser alloc]initMyProfileParser];
//set the Delegate
[xmlParser setDelegate:parserXML];
BOOL success = [xmlParser parse];
if (success)
{
NSLog(@"Successfully Executed");
[myTableView reloadData];
}
else
{
NSLog(@"Error is occured");
}
[av stopAnimating];
[self performSelectorOnMainThread:@selector(loadPageDetails) withObject:nil waitUntilDone:NO];
[myTableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:YES];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
}
[alertLoading dismissWithClickedButtonIndex:0 animated:YES];
return cell;
}
您不應該在創建NSOperationQueue后立即釋放它,而應將對它的引用存儲在您的類中,並在釋放類時釋放它。 否則可能無法執行您的操作。
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