呈现第二个模式视图控制器的问题
问题描述:
此刻我的错误表明我的视图控制器已经呈现为null。我想我有我的下面的代码正确的想法,但我没有正确实施它。感谢您的帮助呈现第二个模式视图控制器的问题
-(IBAction)datePicker
{
//UIViewController *presenter = self.presentingViewController;
[self dismissViewControllerAnimated:YES completion:^{
/*
UIStoryboard* sb = [UIStoryboard storyboardWithName:@"MainStoryboard.storyboard"
bundle:nil];
UIViewController* dateView = [sb instantiateViewControllerWithIdentifier:@"DatePickerViewController"];
*/
[self performSegueWithIdentifier:@"dueDateSegue" sender:self];
//[presenter presentViewController:dateView animated:YES completion:nil];
/*
[self presentViewController:dateView animated:YES completion:^{
UIBarButtonItem *saveDate = [[UIBarButtonItem alloc]
initWithTitle:@"Save Date"
style:UIBarButtonItemStyleDone
target:self
action:@selector(labelDatePicker)];
self.navigationItem.rightBarButtonItem = saveDate;
pick = [[UIDatePicker alloc] init];
[pick setFrame:CGRectMake(0,200,320,120)];
//[pick addTarget:self action:@selector(done) forControlEvents:UIControlEventValueChanged];
//dateFieldText.delegate = self;
//dateFieldText.inputView = pick;
}];
*/
}];
}
答
在该方法中datePicker
添加以下行的第一行代码:
UIViewController *presenter = self.presentingViewController;
然后代替:
[self presentViewController:dateView animated:YES completion:nil];
尝试使用:
[presenter presentViewController:dateView animated:YES completion:nil];
你是否解雇了av当一个人没有真正出现时控制控制器?如果没有什么可以解雇的话,这个街区是否会运行? dismissViewControllerAnimated:completion的文档表明,除非事实上被解散,否则块将不会运行。 – GoZoner 2013-03-16 19:24:18