阅读器 didFinishPickingMediaWithInfo 后的 iOS ZBAR instantiateViewControllerWithIdentifier

Question

我在 didFinishPickingMediaWithInfo 下运行一个函数，但是函数完成后如何渲染另一个 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];
    }];

视图被渲染，但数据来自 [self procesarCheckInConQR:qr];还没准备好

更新： 我没有解雇我，而是展示了新的视图控制器，但我仍然没有来自的数据 procesarCheckInConQR:qr

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

Answer 1

您必须在 [self procesarCheckInConQR:qr] 之后的块内拨打电话