Question

我在这里有这段代码：

if(isLocationTag == YES)
    {
        NSArray *isLocationTagArray = [self getLocationInfo:Name];

        if(isLocationTagArray == nil)
        {

            UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Message" message:@"There is an issue with the location tag." preferredStyle:UIAlertControllerStyleAlert];

            UIAlertAction* ok = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];
            [alertController addAction:ok];

            [self presentViewController:alertController animated:YES completion:nil];

            ScannerMessage.text = @"READY TO SCAN";
            ScannerMessage.backgroundColor = [UIColor greenColor];

        }
        else
        {
            [self performSegueWithIdentifier: @"SegueIdentifier" sender: self];
        }
    }

我想要做的是推动NSArray isLocationTagArray与performSegueWithIdentifier

我添加了这个方法：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if([[segue identifier] isEqualToString:@"SegueIdentifier"])
    {
        ListViewController *myVC = [segue destinationViewController];
    }

}

但我如何通过NSArray？

Answer 1

您必须在目标VC（ListViewController）中定义属性，然后在prepareForSegue中设置它。像这样：

ListViewController.h

@property (strong,nonatomic) NSArray* theParamenterArray;

然后在你的prepareForSegue：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if([[segue identifier] isEqualToString:@"SegueIdentifier"])
    {
        ListViewController *myVC = [segue destinationViewController];
        myVC.theParamenterArray = isLocationTagArray;
    }
}

这是您想要使用故事板在VC之间交换的所有数据的标准方式。

Answer 2

使isLocationTagArray成为模块级变量。然后向可以接受ListViewController

的NSArray添加媒体资源

然后你可以这样做

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if([[segue identifier] isEqualToString:@"SegueIdentifier"])
    {
        ListViewController *myVC = [segue destinationViewController];
        myVC.dataArray = isLocationTagArray
    }

 }

Answer 3

您可以将NSArray作为发件人传递：

...
[self performSegueWithIdentifier: @"SegueIdentifier" sender: isLocationTagArray];
...
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([segue.identifier isEqualToString:@"SegueIdentifier"]) {
        ListViewController *myVC = [segue destinationViewController];
        if ([sender isKindOfClass: [NSArray class]]) {
            myVC.dataArray = (NSArray *) sender;
        }
    }

 }

Objective - C - 使用performSegueWithIdentifier推送NSArray

3 个答案: