objective-c - 将数据传输回原始 View

Question

所以我能够将数据从第一个 View 传输到第二个 View ，如下所示:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
   if ([segue.identifier isEqualToString:@"Check Mark Segue"])
      {
        NSLog(@"Transfering Data");
        AutoRenewDrop *controller = segue.destinationViewController;
        controller.transferData = self.renewDate.text;
      }
}

但是，当用户点击完成并且 transferData 工作正常但 renewDate.text 没有改变时，我尝试将新值传输回 renewDate.text 。这是我用来传回数据的代码:

-(IBAction)done:(UIStoryboardSegue *)segue {

[self.navigationController popViewControllerAnimated:YES];
AddR *add = [[AddR alloc] init];
add.renewDate.text = transferData;

}

有人可以告诉我如何解决这个问题吗？

Answer 1

您需要将包含第一个 View 引用的属性添加到第二个 View 中:

@interface AutoRenewDrop
@property(weak, nonatomic) AddR *callerView;
@end

然后在第二个 View 的 done 方法中，您可以在调用者 View 中更新变量:

-(IBAction)done:(UIStoryboardSegue *)segue {
[self.navigationController popViewControllerAnimated:YES];
callerView.renewDate.text = transferData;
}

当然，当您实例化第二个 View 时，您必须以这种方式设置引用:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
   if ([segue.identifier isEqualToString:@"Check Mark Segue"])
      {
        NSLog(@"Transfering Data");
        AutoRenewDrop *controller = segue.destinationViewController;
        controller.transferData = self.renewDate.text;
        controller.callerView = self; //Here, you are passing the reference to this View
      }
}