Question

您好，我上传后将图片从设备上传到服务器后必须返回主视图控制器，但我在应用中遇到了一些问题。上传图片后，我的应用程序崩溃了。

NSString *urlString = @"url";

    NSMutableURLRequest *request = [[[NSMutableURLRequest alloc]init]autorelease];
    [request setURL:[NSURL URLWithString:urlString]] ;
    [request setHTTPMethod:@"POST"];

    NSString *boundary = @"---------------------------14737809831466499882746641449";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField:@"Content-Type"];

    NSMutableData *body = [NSMutableData data];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary]dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Disposition: form-data; name=\"userfile\"; filename=\".jpg\"\r\n"dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Type: application/octet-stream\r\n\r\n"dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[NSData dataWithData:imageData]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary]dataUsingEncoding:NSUTF8StringEncoding]];
    [request setHTTPBody:body];

    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

    NSLog(@"%@data",returnString);
    [self temp];
    [self performSelector:@selector(myMethod) withObject:nil afterDelay:3.0f];
    alertTimer = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(showAlert) userInfo:nil repeats:NO];

    **[self performSelector:@selector(dissMissViewController) withObject:self afterDelay:4.0f];**

驳回守则。

         - (void)dissMissViewController
     {
        [self dismissViewControllerAnimated:YES completion:^{
        [self.navigationController popToRootViewControllerAnimated:YES];}];

      }

我不在哪里我做错了请告诉我如何解决它。

感谢。

Answer 1

没有堆栈跟踪很难解决它，但似乎是当你的目标被释放时调用你的showAlert方法。

你正在调用[self dismissModalViewController：]，然后才调用 - showAlert。

如果VC没有保留在某个地方，你会在这里崩溃。

Answer 2

如果您application使用Navigation Controller，那么

- (void)dissMissViewController {
        [self.navigationController popViewControllerAnimated:YES];
}

否则，如果它不使用Navigation Controller

- (void)dissMissViewController {
        [self dismissViewControllerAnimated:YES completion:nil];
}

Answer 3

嗨感谢您的重播我通过更改警报视图中的时间间隔来解决问题，现在它正在工作f9。这是代码。

    [self performSelector:@selector(myMethod) withObject:nil afterDelay:3.0f];
    [self performSelector:@selector(dissMissViewController) withObject:self afterDelay:4.0f];
     alertTimer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(showAlert) userInfo:nil repeats:NO];

将当前视图控制器关闭回主视图控制器应用程序获取崩溃IOS 7

3 个答案: