Question

任何人都可以遇到类似的问题吗？也许我错过了什么适当的行动？首先尝试在 AppDelegate 中运行此代码，现在位于 ViewController ，并且具有相同的功能..

或者有人知道如何将此代码放入按钮操作中？

也许有人知道，如何使用UIPresentationPopoverController来呈现这个ActionsViewController？

- (void)viewDidAppear:(BOOL)animated{
        [super viewDidAppear:animated];
        ActionsViewController *actionsViewController = [AppLibrary createActionsViewController];
        actionsViewController.actionDelegate = self;
        actionsViewController.supportedActionTypes = @[[[SupportedAction alloc] initWithActionType:ActionTypeEdit mediaTypes:@[kTypePNG]]];

        [actionsViewController setWhitelistedSubTypes:@[@"adjust", @"filter", @"healing"]];

        if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
            self.actionsNavigationController = [[UINavigationController alloc] initWithRootViewController:actionsViewController];
            [self presentViewController:self.actionsNavigationController animated:YES completion:nil];
        }
}

Answer 1

- Workaround--
只需更改此行：

[self presentViewController:self.actionsNavigationController animated:YES completion:nil];

用这个

UIViewController *rootVC = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
[rootVC presentViewController:self.actionsNavigationController animated:YES completion:nil];

Answer 2

您正尝试在viewdidappear中显示视图控制器。

尝试延迟运行该部分代码。把你的代码放在这个块中。

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
// your code

NewViewController *objNewviewController = [self.storyboard instantiateViewControllerWithIdentifier:@"NewViewController"];

UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:objNewviewController];

navigationController.navigationBar.backgroundColor = [UIColor redColor];

[self presentViewController:navigationController animated:YES completion:nil];
});

如果你想在点击按钮上执行此操作，请使用此

-(IBAction)buttonclick:(id)sender
{
    NewViewController *objNewviewController = [self.storyboard instantiateViewControllerWithIdentifier:@"NewViewController"];

    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:objNewviewController];

    navigationController.navigationBar.backgroundColor = [UIColor redColor];

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

}

我检查了代码及其工作正常。如果它不适合你，那么检查你的viewcontroller是否为零？同样适用于您的导航控制器。

Answer 3

我明白了！:)它与UIPopoverPresentationController和按钮动作一起工作

- (IBAction)popUp:(id)sender {

 ActionsViewController *actionsViewController = [AppLibrary createActionsViewController];
actionsViewController.actionDelegate = self;

actionsViewController.supportedActionTypes = @[[[SupportedAction alloc] initWithActionType:ActionTypeEdit mediaTypes:@[kTypePNG]]];

    [actionsViewController setWhitelistedSubTypes:@[@"adjust", @"filter", @"healing"]];

// present the controller
if(actionsViewController == nil) {
     actionsViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"popover"];
}
// present the controller

actionsViewController.preferredContentSize = CGSizeMake(600, 100);
actionsViewController.modalPresentationStyle = UIModalPresentationCustom;

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(dismissMe)];
[self.view addGestureRecognizer:tap];

 // configure the Popover presentation controller

UIPopoverPresentationController *popoverController = actionsViewController.popoverPresentationController;
popoverController.permittedArrowDirections  = UIPopoverArrowDirectionAny;
popoverController.delegate = self;
popoverController.sourceView = self.view;
popoverController.sourceRect =[sender frame];

 [self presentViewController:actionsViewController animated:YES completion:nil];
}

- (void)dismissMe {

NSLog(@"Popover was dismissed with internal tap");
[self dismissViewControllerAnimated:YES completion:nil];}



-(UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller {
return UIModalPresentationNone;   }

如何将此代码放入按钮操作中？

3 个答案: