Question

我正在显示活动视图，但它显示的数据到服务器上传后可能是由于主线程停止有任何方式在数据上传时显示此活动。两个都在同一时间。

  -(IBAction)startSyncButtonAction{


UIAlertView* alert= [[UIAlertView alloc] initWithTitle:@"Loading\nPlease Wait..." message:nil delegate:self cancelButtonTitle:nil otherButtonTitles: nil];
[alert show];

UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

indicator.center = CGPointMake(150, 100);
[indicator startAnimating];
[alert addSubview:indicator];

CereniaAppDelegate *appDelegate = (CereniaAppDelegate *)[[UIApplication sharedApplication] delegate];

for (int i=0; i<[appDelegate.coffeeArray count]; i++) {

Coffee *coffeeObj = [appDelegate.coffeeArray objectAtIndex:i];


    int mycount=[appDelegate.coffeeArray count];
    NSLog(@"My Array count is %d",mycount);


NSString*device_Id=coffeeObj.device_Id;
NSString*R1=coffeeObj.R1;
NSString*R2=coffeeObj.R2;
NSString*R3=coffeeObj.R3;
NSString*R4=coffeeObj.R4;
NSString*R5=coffeeObj.R5;
NSString*R6=coffeeObj.R6;
NSString*R7=coffeeObj.R7;
NSString*R8=coffeeObj.R8;
NSString*R9=coffeeObj.R9;
NSString*R10=coffeeObj.R10;
NSString*R11=coffeeObj.R11;
NSString*R12=coffeeObj.R12;
NSString*R13=coffeeObj.R13;
NSString*R14=coffeeObj.R14;     


NSString*update_date_time=coffeeObj.update_date_time;

    NSString*teritory1=coffeeObj.teritory;



    int mycount1=[appDelegate.coffeeArray count];


    NSLog(@"My Array After delete is %d",mycount1);


    NSLog(@"device_Id%@",device_Id);
    NSLog(@"R1%@",R1);
    NSLog(@"R2%@",R2);
    NSLog(@"R3%@",R3);
    NSLog(@"R4%@",R4);
    NSLog(@"R4%@",R5);
    NSLog(@"R4%@",R6);
    NSLog(@"R4%@",R7);
    NSLog(@"R4%@",R8);
    NSLog(@"R4%@",R9);
    NSLog(@"R4%@",R10);
    NSLog(@"R4%@",R11);
    NSLog(@"R4%@",R12);
    NSLog(@"R4%@",R13);
    NSLog(@"R4%@",R14);

    NSLog(@"update_date_time%@",update_date_time);

    NSString *post =[[NSString alloc] initWithFormat:@"device_Id=%@&R1=%@&R2=%@&R3=%@&R4=%@&R5=%@&R6=%@&R7=%@&R8=%@&R9=%@&R10=%@&R11=%@&R12=%@&R13=%@&R14=%@&update_date_time=%@&teritory1=%@",device_Id,R1,R2,R3,R4,R5,R6,R7,R8,R9,R10,R11,R12,R13,R14,update_date_time,teritory1];



    NSLog(post);
    NSURL *url=[NSURL URLWithString:@"http://celeritas-solutions.com/pah_brd_v1/pfizersurvey/SyncSurveySTD.php"];
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;
    [request setURL:url];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:postData];



    NSError *error;
    NSURLResponse *response;
    NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    NSString *data=[[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];
    NSLog(@"%@",data);

      }


for (int i=0; i<[appDelegate.coffeeArray count]; i++) {

    Coffee *coffeeObj = [appDelegate.coffeeArray objectAtIndex:i];


     [appDelegate removeCoffee:coffeeObj];

}




[alert dismissWithClickedButtonIndex:0 animated:YES];

    }

Answer 1

您可以在主线程上设置警报和上传代码，因此在另一个线程上打开上传方法（比如说（void）uploadData）的警报调用时。您的代码只是粘贴了UI，直到完成所有数据上传，然后UI才可以自由发送警报。

在动作 - （IBAction）startSyncButtonAction中，调用警报和UI内容：

UIAlertView* alert= [[UIAlertView alloc] initWithTitle:@"Loading\nPlease Wait..." message:nil delegate:self cancelButtonTitle:nil otherButtonTitles: nil];
[alert show];

UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

indicator.center = CGPointMake(150, 100);
[indicator startAnimating];
[alert addSubview:indicator];

CereniaAppDelegate *appDelegate = (CereniaAppDelegate *)[[UIApplication sharedApplication] delegate];

for (int i=0; i<[appDelegate.coffeeArray count]; i++) {

Coffee *coffeeObj = [appDelegate.coffeeArray objectAtIndex:i];


    int mycount=[appDelegate.coffeeArray count];
    NSLog(@"My Array count is %d",mycount);


NSString*device_Id=coffeeObj.device_Id;
NSString*R1=coffeeObj.R1;
NSString*R2=coffeeObj.R2;
NSString*R3=coffeeObj.R3;
NSString*R4=coffeeObj.R4;
NSString*R5=coffeeObj.R5;
NSString*R6=coffeeObj.R6;
NSString*R7=coffeeObj.R7;
NSString*R8=coffeeObj.R8;
NSString*R9=coffeeObj.R9;
NSString*R10=coffeeObj.R10;
NSString*R11=coffeeObj.R11;
NSString*R12=coffeeObj.R12;
NSString*R13=coffeeObj.R13;
NSString*R14=coffeeObj.R14;     


NSString*update_date_time=coffeeObj.update_date_time;

    NSString*teritory1=coffeeObj.teritory;



    int mycount1=[appDelegate.coffeeArray count];


    NSLog(@"My Array After delete is %d",mycount1);


    NSLog(@"device_Id%@",device_Id);
    NSLog(@"R1%@",R1);
    NSLog(@"R2%@",R2);
    NSLog(@"R3%@",R3);
    NSLog(@"R4%@",R4);
    NSLog(@"R4%@",R5);
    NSLog(@"R4%@",R6);
    NSLog(@"R4%@",R7);
    NSLog(@"R4%@",R8);
    NSLog(@"R4%@",R9);
    NSLog(@"R4%@",R10);
    NSLog(@"R4%@",R11);
    NSLog(@"R4%@",R12);
    NSLog(@"R4%@",R13);
    NSLog(@"R4%@",R14);

    NSLog(@"update_date_time%@",update_date_time);

在对另一个线程中的方法的调用结束时

// Perform all the data initializations on a new thread
[NSThread detachNewThreadSelector:@selector(uploadData:) toTarget:self withObject:nil];

然后你需要另一种方法

   -(void) uploadData:(id) obj 
{
 NSLog(post);
    NSURL *url=[NSURL URLWithString:@"http://celeritas-solutions.com/pah_brd_v1/pfizersurvey/SyncSurveySTD.php"];
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;
    [request setURL:url];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:postData];



    NSError *error;
    NSURLResponse *response;
    NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    NSString *data=[[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];
    NSLog(@"%@",data);

      }


for (int i=0; i<[appDelegate.coffeeArray count]; i++) {

    Coffee *coffeeObj = [appDelegate.coffeeArray objectAtIndex:i];


     [appDelegate removeCoffee:coffeeObj];
[self performSelectorOnMainThread:@selector(dataDoneLoading:) withObject:_photos waitUntilDone:NO];
}

并将所有上传代码放在那里。最后再将“dataDoneLoading”添加到mainthread上

Answer 2

使用

[self performSelector：@selector（displayAlertView）withObject：nil afterDelay：0.1];

方法

UIAlertView在数据上传之后才开始

2 个答案: