Every time that I press the button activating the action above, my screen goes black.
I just want pass to another view (or same) without using the model proposed by storyboard.
What's wrong?
Thanks
- (IBAction)goToView:(id)sender {
ViewController *controller = [[ViewController alloc] initWithNibName:nil bundle:nil];
[self presentViewController:controller animated:YES completion:nil];
You haven't configured your controller's view.
For example try this just before you presentViewController...
controller.view.backgroundColor = [UIColor orangeColor];
Your screen will turn orange...
Full example:
- (IBAction)goToView:(id)sender {
ViewController *controller = [[ViewController alloc]
initWithNibName:nil bundle:nil];
controller.view.backgroundColor = [UIColor orangeColor];
[self presentViewController:controller animated:YES completion:nil];
}
Related
I wanted to populate my uncontrolled view as presentViewController on my app, but it does not work. I do not want to cover the entire screen. Like on the iPad, it should view at the centre and frame, which is preferred.
Below is my code which covers the entire screen:
MyView *testview = [[MyView alloc]init];
testview.modalPresentationStyle = UIModalPresentationFormSheet;
testview.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController: testview animated:YES completion:nil];
I do not want to push my UIViewController...
You cannot present a View. You must present a controller. for example:
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"Main" bundle: nil];
MyViewController* vc = [mainStoryboard instantiateViewControllerWithIdentifier:#"MY_CTL_ID"];
[self presentViewController:vc animated:NO completion:nil];
Here's what worked for me (iOS 9 or later):
MyViewController *testVC = [[MyViewController alloc] init];
testVC.modalPresentationStyle = UIModalPresentationFormSheet;
testVC.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
// Both of these are necessary to make it present as a form sheet on an iPhone/iPod.
testVC.presentationController.delegate = vc;
testVC.presentationController.overrideTraitCollection = [UITraitCollection traitCollectionWithTraitsFromCollections:#[[UITraitCollection traitCollectionWithUserInterfaceIdiom:UIUserInterfaceIdiomPad]]];
// Set the size if you don't set it elsewhere.
testVC.preferredContentSize = CGSizeMake(270, 130);
[self presentViewController:vc animated:YES completion:nil];
Also, the view controller you are presenting needs implement the UIAdaptivePresentationControllerDelegate protocol:
#interface MyViewController () <UIAdaptivePresentationControllerDelegate>
...
#end
#implementation MyViewController
...
(UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller traitCollection:(UITraitCollection *)traitCollection {
// This makes it use the presentation style that was set when it was presented.
return UIModalPresentationNone;
}
...
#end
I'm quite new to Objective-C. I want to go to another view controller but it shows me only the black screen after the button click. Is there something that I'm missing here?
Here is my code:
- (IBAction)measuring1stscan:(id)sender {
measuringscan *second = [[measuringscan alloc]initWithNibName:nil bundle:nil];
[self presentViewController:second animated:NO completion:NULL];
}
*measuringscan is the name for another view controller
viewConreoller default is no color, it is black. just add second.view.backgroundColor = [UIColor redColor];
- (IBAction)measuring1stscan:(id)sender {
measuringscan *second = [[measuringscan alloc] init];
second.view.backgroundColor = [UIColor redColor];
[self presentViewController:second animated:NO completion:NULL];
}
#rose is right try to give different color and then check.
Still you face same issue then try to run below code.
Embadded viewcontroller into navigation controller and give unique identifier to second viewcontroller.
- (IBAction)measuring1stscan:(id)sender
{
UIStoryboard *st = [UIStoryboard storyboardWithName:[NSString stringWithFormat:#"StoryboardWithName"] bundle:NULL];
measuringscan *second = [st instantiateViewControllerWithIdentifier:#"viewcontrollerIdentifier"];
[self.navigationController pushViewController:second animated:YES];
}
If you are using storyboard then use following
measuringscan *controller = [self.storyboard instantiateViewControllerWithIdentifier:#"StoryboardIdentifier"];
[self presentViewController:controller animated:YES completion:nil];
or
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:[NSString stringWithFormat:#"StoryboardName"] bundle:nil];
measuringscan *controller = [storyboard instantiateViewControllerWithIdentifier:#"viewcontroller'sIdentifier"];
[self presentViewController:controller animated:YES completion:nil];
And if you aren't using storyboard instead you are using xib's then use following
measuringscan *controller = [[measuringscan alloc] initWithNibName:nil bundle:nil];
[self presentViewController:controller animated:YES completion:nil];
Points to remember (as said by #rmaddy)
Class name should be start with capital letter
Variable name should start with small letter
It is the naming convention that should be followed by a developer.
For more details click here
I am making an app with different view controllers. My home screen is in main.storyboard. Rest of the view controllers have their own xib, .h & .m files. I am trying this for navigation from home screen.
-(IBAction)btnSignUpTapped:(id)sender
{
SignUpWithEmailViewController * login = [[SignUpWithEmailViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc]
initWithRootViewController:login];
[self presentViewController:nav animated:YES completion:NULL];
}
This code works fine for navigating to different viewcontroller (in this case SignUpwithEmailViewController). On SignUpWithEmailViewController I have a back button which is supposed to bring me back to home screen. This is what I got so far:
-(IBAction)btnBackTapped:(id)sender
{
ViewController * homeScreen = [[ViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc]
initWithRootViewController:homeScreen];
[self presentViewController:nav animated:YES completion:NULL];
}
But as result of this code, screen turns black and nothing happens. How do I solve this problem? For hiding the nav bar I am using
-(void) viewWillAppear:(BOOL)animated
{
[[self navigationController] setNavigationBarHidden:YES animated:NO];
}
Yes, you have to insert you called viewController to NavigationController,
but if you wont to use modal flow - to close presentedViewController just call:
[self dismissViewControllerAnimated:YES completion:^{
}];
EDITED:
may be it will be more helpful, it just example, put it to you main view controller:
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
UIViewController *c = [[UIViewController alloc] init];
c.view.backgroundColor = [UIColor redColor];
[self presentViewController:c animated:YES completion:^{
[self dismissViewControllerAnimated:YES completion:^{
}];
}];
}
My problem is when I present a UIViewController the presenting views are going black.
I have a UIViewController named mainViewController which is the root view of my windows.
Inside I have a MMDrawerController (just added as a subview of mainViewController's view).
The MMDrawerController contains the rest of my views.
But when I'm presenting a new UIViewController from my mainViewController, the new VC displays well, but when it dismisses it left only black screen behind.
To note the black screen appears when adding (I can see it directly). Not when dismissing.
For testing purpose I did this code :
UIViewController *vc = [UIViewController new];
vc.view.backgroundColor = [UIColor redColor];
[[[[UIApplication sharedApplication] keyWindow] rootViewController] presentViewController:vc animated:NO completion:^{
[vc dismissViewControllerAnimated:YES completion:nil];
}];
Which do the same black result as normal use. (normally it's a QLViewController...)
My mainViewController is set like it :
_mainViewController = [MyMainViewController new];
_window.rootViewController = _mainViewController;
[self.window addSubview:_mainViewController.view];
Souce code of MMDrawerController which is up to date in my project
I have tested the code just in MMDrawerController example project, but I can't reproduce the problem, following is what I have tried:
MMAppDelegate.m
-(BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
//...
UIViewController *testVc = [[UIViewController alloc] init];
testVc.view.backgroundColor = [UIColor greenColor];
[testVc.view addSubview:self.drawerController.view];
[self.window setRootViewController:testVc];
[self.window addSubview:testVc.view];
return YES;
}
MMExampleSideDrawerViewController.m:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
switch (indexPath.section) {
case MMDrawerSectionViewSelection:{
UIViewController *vc = [UIViewController new];
vc.view.backgroundColor = [UIColor redColor];
UIViewController *mainVC = [[UIApplication sharedApplication] keyWindow].rootViewController;
[mainVC presentViewController:vc animated:YES completion:^{
[vc dismissViewControllerAnimated:YES completion:nil];
}];
return;
//...
}
MMExampleCenterTableViewController.m:
-(void)doubleTap:(UITapGestureRecognizer*)gesture{
UIViewController *vc = [UIViewController new];
vc.view.backgroundColor = [UIColor redColor];
UIViewController *mainVC = [[UIApplication sharedApplication] keyWindow].rootViewController;
[mainVC presentViewController:vc animated:YES completion:^{
[vc dismissViewControllerAnimated:YES completion:nil];
}];
return;
[self.mm_drawerController bouncePreviewForDrawerSide:MMDrawerSideLeft completion:nil];
}
In the end, the problem was that I applied inset constraints on my mainViewController.
Behind the scene I suppose that method presentViewController:animated:completion: use frames and not AutoLayout, which break the UIView of the UIViewController that are in the mainViewController.
Thanks to #simalone, I used the same way to find the origin of the problem (use MMDrawerController example project).
I you want to test yourself the problem, I uploaded the example project with the issue so you can understand it.
There is a breakpoint on the line which is the origin of the bug.
Then just double click on the view.
Thanks again to #simalone. Cheers !
very new to obj-c.
I´ve made a simple MainViewController, loading its view from a xib. (From a standard single view template)
On the main view is a button that takes me to another view. Below is the Method:
-(IBAction)forward:(id)sender
{
tvc = [[TrackViewController alloc] initWithNibName:nil bundle:[NSBundle mainBundle]];
[self.view addSubview:tvc.view];
}
On the other view (also loaded from xib) i have a button to take me back to the main view.
Here is my IBAction for returning to the main view:
-(IBAction) back:(id)sender {
[self.navigationController popViewControllerAnimated:YES];
}
However it does not return to the main view. Not with popToRootViewControllerAnimated: either.
Any response will be appreciated!
This answer applies when you are not using UINavigationBar
In your Forward button you need to write.
TrackViewController *lf = [[TrackViewController alloc]initWithNibName:#"TrackViewController" bundle:nil];
[self presentViewController:TVC animated:YES completion:nil];
and in the Backward screen you should right.
[self dismissViewControllerAnimated:NO completion:nil];
You should load your MainViewController in your AppDelegate in an UINavigationController
MainViewController *mainVC = ...
UINavigationController *naviVC = [[UINavigationController alloc] initWithRootViewController:mainVC];
self.window.rootViewController = naviVC;
Then you can go forward in your MainViewController:
-(IBAction)forward:(id)sender;
{
tvc = [[TrackViewController alloc] initWithNibName:nil bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:tvc animated:YES];
}
and go back in your other ViewController:
-(IBAction) back:(id)sender {
[self.navigationController popViewControllerAnimated:YES];
}
If your MainViewController is inside a UINavigationController, then the forward method should look like this:
-(IBAction)forward:(id)sender
{
tvc = [[TrackViewController alloc] initWithNibName:nil bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:tvc animated:TRUE];
}