Question

我在didFinishPickingMediaWithInfo下运行一个函数但是如何在函数完成后渲染另一个viewController

- (void) imagePickerController: (UIImagePickerController*) reader
 didFinishPickingMediaWithInfo: (NSDictionary*) info
{
    id<NSFastEnumeration> results =[info objectForKey: ZBarReaderControllerResults];

    NSString *qr;
    for (ZBarSymbol *symbol in results) {
        NSLog(@"Resultado: %@", symbol.data);
        qr = symbol.data;
    }

    [reader dismissViewControllerAnimated:YES completion:^{
        [self procesarCheckInConQR:qr];
    }];

}

我尝试添加

UIViewController *newTopViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"rootCarta"];
[reader presentViewController:newTopViewController animated:YES completion:nil];

之后

[reader dismissViewControllerAnimated:YES completion:^{
        [self procesarCheckInConQR:qr];
    }];

并呈现视图，但来自[self procesarCheckInConQR：qr]的数据;尚未准备好

更新而不是解雇我提出新的视图控制器，但我仍然没有数据 procesarCheckInConQR：QR

UIViewController *newTopViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"rootCarta"];
[reader presentViewController:newTopViewController animated:YES completion:^{
    [self procesarCheckInConQR:qr];
}];

Answer 1

你必须在[self procesarCheckInConQR:qr]

之后在街区内进行通话

阅读器didFinishPickingMediaWithInfo后的iOS ZBAR instantiateViewControllerWithIdentifier

1 个答案: