如何从UIActivity View Controller中选择的UIActivity项目中呈现ModalViewController？ [英] How can I present a ModalViewController from a UIActivity item picked from UIActivity View Controller?
问题描述
我正在开发一个在detailViewController中显示一些数据的应用程序。我在导航栏中有一个rightBarButton，它提供了一个UIActivityViewController，它充满了我自己的UIActivity子程序项。它们中的大多数工作正常，因为它们只是从详细视图中将一个小方面改变为数据，但我需要其中一个在选择时打开modalViewController。我一直从控制台收到以下警告......
I am working on an app that presents some data in a detailViewController. I have a rightBarButton in the navbar that presents a UIActivityViewController that is filled with my own UIActivity sublclassed items. Most of them work fine as they are just changing a small aspect to the data from the detail view, but I need one of them to open a modalViewController when selected. I keep getting the following warning from the console.....
Warning: Attempt to present <UINavigationController: 0x1fd00590>
on <UITabBarController: 0x1fde1070> which is already presenting <MPActivityViewController: 0x1fd2f970>
我想值得注意的是应用程序没有崩溃，但模态视图没有出现无论是。我假设UIActivityViewController本身是一个模态视图，你只能一次显示其中一个，所以任务是弄清楚在ActivityView消失后如何执行我的segue，但这就是我难倒的地方。我欢迎任何帮助，想法或反馈。我已经尝试了谷歌，但没有太多运气，我认为因为UIActivityViewController是如此新。
I suppose it is worth noting that the app doesn't crash but the modal view doesn't appear either. I am assuming that the UIActivityViewController is a modal view itself and you can only display one of those at a time so the task is to figure out how to perform my segue after the ActivityView has disappeared, but thats where I am stumped. I welcome any help, thoughts or feedback. I've tried google but haven't had much luck, I assume because The UIActivityViewController is so new.
这是我的设置到目前为止，
我的UIActivity对象具有设置为detailViewController的委托，用于自定义协议，该协议允许detailViewController执行数据更改，然后更新其视图。
Here is my setup so far, my UIActivity objects have a delegate set to the detailViewController for a custom protocol that lets the detailViewController perform the data changes and then update its view.
对于有问题的活动，应该提供modalView控制器我尝试过几种方法都会得到相同的警告。
for the activities in question that should present the modalView controller I have tried a few approaches that all get the same warning.
这些都不起作用!!!
1）只是尝试从我的委托方法执行segue
1) simply tried performing segue from my delegate method
- (void) activityDidRequestTransactionEdit
{
NSLog(@"activityDidRequestTransactionEdit");
[self performSegueWithIdentifier:@"editTransaction" sender:self];
}
2）尝试在UIActivityViewController上设置完成块并设置我的委托方法应该显示模态视图的bool标志（self.editor）
2)tried setting a completion block on the UIActivityViewController and having my delegate method set a bool flag that the modal view should be shown(self.editor)
[activityViewController setCompletionHandler:^(NSString *activityType, BOOL completed) {
NSLog(@"completed dialog - activity: %@ - finished flag: %d", activityType, completed);
if (completed && self.editor) {
[self performSegueWithIdentifier:@"editTransaction" sender:self];
}
}];
3）继承UIActivityViewController本身，给它作为委托的detailView，并覆盖它的dismissViewControllerAnimated：方法使用我自己的完成块
3) subclassing the UIActivityViewController itself, giving it the detailView as a delegate, and overriding it's dismissViewControllerAnimated: method with my own completion block
- (void) dismissViewControllerAnimated:(BOOL)flag completion:(void (^)(void))completion
{
[super dismissViewControllerAnimated:flag completion:^{
[self.MPActivityDelegate activityDidRequestTransactionEdit];
}];
}
工作解决方案
在UIActivity子类中，您需要覆盖此方法，如此
In the UIActivity subclass you need to override this method like so
- (UIViewController *) activityViewController {
MPEditMyDataViewController *controller = [[MPEditMyDataViewController alloc] init];
controller.activity = self; // more on this property below
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:controller];
return navController;
}
$ MP
$ b
在MPEditMyDataViewController.h中（所选操作应生成的视图控制器）
您需要一个属性返回活动子类，如此
in your MPEditMyDataViewController.h (the view controller the chosen action should produce) You need a property back to the activity subclass like so
@property (strong, nonatomic) MPEditMyDataActivity *activity;
- (void)viewDidLoad
{
[super viewDidLoad];
UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
target:self
action:@selector(cancel)];
self.navigationItem.leftBarButtonItem = cancelButton;
}
// here's how you dismiss the view controller when you are done with it
// after saving the changes to your data or whatever the view controller is supposed to do.
-(void) cancel
{
NSLog(@"Cancel Button Pushed");
[self.activity activityDidFinish:YES];
}
@end
推荐答案
做了更多的文档挖掘并发现这个方法用于UIActivity子类化
Did some more documentation digging and found this method for UIActivity subclassing
- (UIViewController *) activityViewController
它让我的视图控制器像我想要的那样从这里返回而不是试图从我的detailViewController中删除它。现在要弄清楚当我完成它时如何解雇它!!!!
it gets my view controller to pop up like I wanted by returning it from here instead of trying to segue it from my detailViewController. Now to figure out how to dismiss it when I'm done with it!!!!
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