I have freshly setup app, just with a window an a root view (from the iOS single view application template, provided by XCode).
Now I try to add a button to it.
The according code looks like this:
- (BOOL) application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
UIButton* button0 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button0.frame = CGRectMake(140, 230, 40, 20);
[button0 setTitle:#"Exit" forState:UIControlStateNormal];
[button0 addTarget:self action:#selector(action) forControlEvents:UIControlEventTouchUpInside];
[self.viewController.view addSubview:button0];
if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController_iPhone" bundle:nil];
else
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController_iPad" bundle:nil];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
When I start the app, I can only see the empty view.
However, when comment out the line, which adds the view as root to the window and instead directly add the button to the window, then I can see the button just fine.
So why isn't this working with the view?
The problem is that, you are adding button0 as subview of self.viewController.view even before allocating the viewController.
By the time you call addSubview: method, self.viewController is nil. So, the button is not added to the viewController. You should add the button after you allocate the viewController.
self.viewController = [[ViewController alloc]...
[self.viewController.view addSubview:button0];
At first, create the root viewcontroller, later add subviews to it. You did it the other way round.
Related
I'm having trouble trying to pop a view
App Delegate
#implementation MAAppDelegate
#synthesize navController;
#synthesize detailViewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Init the navController for the Master Detail View of the grade cells
UINavigationController *navController = [[UINavigationController alloc] init];
detailViewController = [[UIViewController alloc] init]; //step6
navController = [[UINavigationController alloc] initWithRootViewController:[[MAController alloc] init]]; //step7
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
self.window.rootViewController = navController; //step8
[self.window makeKeyAndVisible];
// Set MAController as rootViewController
//self.window.rootViewController = [[MAController alloc] init];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
// Use the insanely cool TSMessages to show network alerts
[TSMessage setDefaultViewController: self.window.rootViewController];
return YES;
}
First part of viewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.navigationController setNavigationBarHidden:YES];
UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] initWithTitle:#"Home" style:UIBarButtonItemStyleBordered target:self action:#selector(home:)];
self.navigationItem.leftBarButtonItem=newBackButton;
Later, when I change the viewController
NSLog(#"Opened progress report");
UIViewController *detailViewControl = [[UIViewController alloc] init];
// Set progress report as the view controller
[self.navigationController pushViewController:detailViewControl animated:YES];
UIImage *background = [UIImage imageNamed:#"bg"];
// Add static image bg
self.backgroundImageView = [[UIImageView alloc] initWithImage:background];
self.backgroundImageView.contentMode = UIViewContentModeScaleAspectFill;
[self.view addSubview:self.backgroundImageView];
// Add blurred layer to image when tableView goes in front of it
self.blurredImageView = [[UIImageView alloc] init];
self.blurredImageView.contentMode = UIViewContentModeScaleAspectFill;
self.blurredImageView.alpha = 0;
[self.blurredImageView setImageToBlur:background blurRadius:10 completionBlock:nil];
[self.view addSubview:self.blurredImageView];
[self.navigationController setNavigationBarHidden:NO];
So I don't understand why that when I do this, a selector from the button (that I know fires, because I get Righthtere in my log):
-(void)home:(UIBarButtonItem *)sender {
NSLog(#"Righthtere");
// Set progress report as the view controller
[self.navigationController popToViewController:self animated:YES];
}
It doesn't go back to the initial view controller.
You seem to be confusing popToViewController and popViewControllerAnimated. popViewControllerAnimated removes the current view from the stack and brings the new stack top the active view controller. popToViewController pops the stack until the listed view controller is on top of the stack.
Since you are calling popToViewController with self, it will look and see that the requested view controller is already on top of the stack and do nothing. If you wish to go back one view controller then your call should be.
[self.navigationController popViewControllerAnimated:YES];
I use the below code to pop the previous viewcontroller in iOS 8.
[self presentModalViewController:viewcontroller animated:YES];
I added my custom view to the window but it doesn't work. I tried to figure it out but it doesn't work well. (I created this project with the empty project template without using storyboards). This screen is supposed to show the red rectangle towards the bottom right corner of the screen.
I wanted to add my custom view showing red screen to the window, but it just shows the white screen.
AppDelegate.m:
//
// HypnosisterAppDelegate.m
// Hypnosister
//
// Created by TSH on 12/1/13.
// Copyright (c) 2013 TSH. All rights reserved.
//
#import "HypnosisterAppDelegate.h"
#import "HypnosisterViewController.h"
#import "HypnosisView.h"
#implementation HypnosisterAppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
HypnosisterViewController *test = [[HypnosisterViewController alloc] initWithNibName:#"HypnosisterViewController" bundle:nil];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:test];
self.window.rootViewController = nav;
CGRect viewFrame = CGRectMake(16, 24, 10, 15);
HypnosisView *view = [[HypnosisView alloc] initWithFrame:viewFrame];
[view setBackgroundColor:[UIColor redColor]];
[[self window] addSubview:view];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
#end
[edit]
I just messed up the ordering.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
HypnosisterViewController *test = [[HypnosisterViewController alloc] initWithNibName:#"HypnosisterViewController" bundle:nil];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:test];
self.window.rootViewController = nav;
CGRect viewFrame = CGRectMake(160, 240, 100, 150);
HypnosisView *view = [[HypnosisView alloc] initWithFrame:viewFrame];
[view setBackgroundColor:[UIColor redColor]];
[[self window] addSubview:view];
return YES;
}
As you set navigationcontroller as rootviewcontroller so HypnosisterViewController will appear every time no doubts. If you want to add a custom view to have to add as a subview on the HypnosisterViewController.
HypnosisView *view = [[HypnosisView alloc] initWithFrame:viewFrame];
[view setBackgroundColor:[UIColor redColor]];
[test.view addSubview:view];
Hopefully it will work
#toshi You code is correct just you missed the ordering .Use this code it will work.Let me know if it doesn't work.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
HypnosisterViewController *test = [[HypnosisterViewController alloc] initWithNibName:#"HypnosisterViewController" bundle:nil];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:test];
self.window.rootViewController = nav;
[self.window makeKeyAndVisible];
CGRect viewFrame = CGRectMake(16, self.window.frame.size.height - 24, 10, 15);
HypnosisView *view = [[HypnosisView alloc] initWithFrame:viewFrame];
[view setBackgroundColor:[UIColor redColor]];
[[self window] addSubview:view];
self.window.backgroundColor = [UIColor whiteColor];
return YES;
}
There is two points
1- The coordinate of the view in iOS begin from top-left so this frame (16, 24, 10, 15) will in the top-left of the view as frame calculated as (x,y,width,height)
2- Window does not responds to device Orientation. It will be always Portrait. If you rotate your device you will need to re-calculate the view Coordinate.
I am trying to see a view with the following code where I am using storyboard however I did not make the uiviewcontroller's scene initial view controller.
This is the code I wrote in didFinishLaunchingWithOption of my AppDelegate.
UIWindow* window = [UIApplication sharedApplication].keyWindow;
abcViewController *controller = [[abcViewController alloc]init];
UIView *redView = [[UIView alloc] initWithFrame: CGRectMake ( [[UIScreen mainScreen] bounds].origin.x+30, [[UIScreen mainScreen] bounds].origin.y+30, 260, 400)];
[redView setBackgroundColor:[UIColor redColor]];
UIView *greenView = [[UIView alloc] initWithFrame: CGRectMake ( redView.frame.origin.x + 10.0f, redView.frame.origin.y + 10.0f, 180, 320)];
[greenView setBackgroundColor:[UIColor greenColor]];
[redView addSubview:greenView];
[controller.view addSubview:redView];
window.rootViewController = controller;
[window makeKeyAndVisible];
return YES;
First assign storyboard id to the abcViewController in storyboard eg."firstView".
Import the viewController in app delegate
In the storyboard, uncheck the "Is initial View Controller" attribute from the first view controller.
In the app's info.plist, remove the value of "Main storyboard file base name".
Instantiate the storyboard, create the window object and set initial view controller in the app delegate's application:didFinishLaunchingWithOptions: method
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
TestViewController *controller = [storyboard instantiateViewControllerWithIdentifier:#"firstView"];
UIView *redView = [[UIView alloc] initWithFrame: CGRectMake ( [[UIScreen mainScreen] bounds].origin.x+30, [[UIScreen mainScreen] bounds].origin.y+30, 260, 400)];
[redView setBackgroundColor:[UIColor redColor]];
UIView *greenView = [[UIView alloc] initWithFrame: CGRectMake ( redView.frame.origin.x + 10.0f, redView.frame.origin.y + 10.0f, 180, 320)];
[greenView setBackgroundColor:[UIColor greenColor]];
[redView addSubview:greenView];
[controller.view addSubview:redView];
self.window.rootViewController = controller;
[self.window makeKeyAndVisible];
return YES;
}
I have been trying an app with initial login screen which then takes to a TabBarController.
I want to know whats the best approach to do this any example code would be appreciated. I have tried it but I am unable to switch from ViewController to TabController.
I'm not sure that this is the best way to do it, but it's quick and dirty and works. Present a modal view controller inside your applicationDidFinishLaunchineWithOptions: method. You should replace the #selector with something more appropriate to what you want to do. Background color is for effect only.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:#"FirstViewController" bundle:nil];
UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = #[viewController1, viewController2];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
// ***** The relevant code *****
UIViewController *viewController = [[UIViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
[[viewController view] setBackgroundColor:[UIColor redColor]];
UIButton *dismissButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[dismissButton setFrame:CGRectMake(10, 10, 300, 44)];
[dismissButton setTitle:#"Dismiss" forState:UIControlStateNormal];
[dismissButton addTarget:[self tabBarController] action:#selector(dismissModalViewControllerAnimated:) forControlEvents:UIControlEventTouchUpInside];
[[viewController view] addSubview:dismissButton];
[[self tabBarController] presentViewController:navigationController animated:NO completion:nil];
return YES;
}
I normally wouldn't like to put this sort of code in the app delegate, but if it's a one-time thing like login details, maybe it's ok.
Assume your root view controller is also your login view.
Now from your root view controller, you can present the tab bar controller a number of ways. One way is to just call the presentViewController method from the root view controller.
Setup
From within the root view controller, sometime before presenting the tab bar, set it up:
myTabBarViewController = [[MyTabBarViewController alloc] init];
[myTabBarViewController setModalPresentationStyle:UIModalPresentationFullScreen];
[myTabBarViewController setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];
[myTabBarViewController setRootTabBarDelegate:self];
Presentation
When you are ready to present, just call this:
[self presentViewController:myTabBarViewController animated:YES completion:nil];
Notes
The view controller hierarchy looks like this:
AppDelegate
L RootViewController
L MyTabBarController
I'm developing an app for ios with a Tab Bar. I have more than 5 buttons on the bar, so on the iphone i have the button more.
Now, suppose i have this buttons: Button1 Button2 Button3 Button4 More (and inside More) Button5 Button6.
If i click More and then Button5 i go in the view relative to Button5. Then i click Button2 (that is not in the More) and i go in the view relative to Button2.
So far so good.
Now if i click More i go not to More Tab but back to the view relative to Button5.
How do i make the more button go always to the more view?
You don't need to add more button. Just set the view controllers to the UITabBarController
- (void)setViewControllers:(NSArray *)viewControllers animated:(BOOL)animated
and it will automatically create a more button if you have more than 5 view controllers! i.e. the count of NSArray is greater than 5.
Another way you could do is, whenever the user presses more, the first button gets removed and other buttons gets added.
Basically you can create an array and keep all the buttons inside it. And then based on the button pressed you can navigate to that particular view.
For Ex:
Initially you have: Button1 Button2 Button3 Button4 Next
After Clicking Next: Prev Button3 Button4 Button5 Button6
I used this code in my app delegate.m to solve the problem
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
UITabBarController* tabBarController2 = (UITabBarController*)self.window.rootViewController;
if (tabBarController2.selectedIndex < 4) {
[tabBarController2.moreNavigationController popViewControllerAnimated:NO];
}
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIViewController *viewController1 = [[UIViewController alloc] init];
UIViewController *viewController2 = [[UIViewController alloc] init];
UIViewController *viewController3 = [[UIViewController alloc] init];
UIViewController *viewController4 = [[UIViewController alloc] init];
UIViewController *viewController5 = [[UIViewController alloc] init];
UIViewController *viewController6 = [[UIViewController alloc] init];
UIViewController *viewController7 = [[UIViewController alloc] init];
UIViewController *viewController8 = [[UIViewController alloc] init];
UIViewController *viewController9 = [[UIViewController alloc] init];
[viewController1.view setBackgroundColor:[UIColor whiteColor]];
[viewController2.view setBackgroundColor:[UIColor redColor]];
[viewController3.view setBackgroundColor:[UIColor greenColor]];
[viewController4.view setBackgroundColor:[UIColor grayColor]];
[viewController5.view setBackgroundColor:[UIColor blueColor]];
[viewController6.view setBackgroundColor:[UIColor yellowColor]];
[viewController7.view setBackgroundColor:[UIColor brownColor]];
[viewController8.view setBackgroundColor:[UIColor magentaColor]];
[viewController9.view setBackgroundColor:[UIColor purpleColor]];
[viewController1 setTitle:#"one"];
[viewController2 setTitle:#"two"];
[viewController3 setTitle:#"three"];
[viewController4 setTitle:#"four"];
[viewController5 setTitle:#"five"];
[viewController6 setTitle:#"six"];
[viewController7 setTitle:#"seven"];
[viewController8 setTitle:#"eight"];
[viewController9 setTitle:#"nine"];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = #[viewController1, viewController2, viewController3, viewController4, viewController5, viewController6, viewController7, viewController8, viewController9];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
I have added a sample AppDelegate code which I tried and its working absolutely fine for me. Let me know what problem your having in this.