Good evening,
I currently have two UIViewControllers. My appDelegate looks like this
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
struct CGRect rect = [[UIScreen mainScreen] bounds];
rect.origin.x = rect.origin.y = 0.0f;
_viewController = [[sandboxViewController alloc] init];
UINavigationController *nc = [[UINavigationController alloc] initWithRootViewController:_viewController];
_window = [[UIWindow alloc] initWithFrame:rect];
[_window makeKeyAndVisible];
[_window addSubview:nc.view];
return YES;
}
The viewController looks like this:
- (void)loadView {
self.view = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 480.0f)];
self.view.backgroundColor = [UIColor whiteColor];
self.navigationItem.title = #"Master View";
}
- (void)viewDidLoad
{
[super viewDidLoad];
UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeInfoLight];
[infoButton addTarget:self action:#selector(switchView:) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:infoButton];
}
- (void)switchView:(id)obj {
if(![self navigationController])
NSLog(#"navigationController IS NIL!!!");
if(!_secondView)
_secondView = [[secondViewController alloc] init];
[self.navigationController pushViewController:_secondView animated:YES];
}
By clicking on the info button, that was added to the right side on the navigation bar, I want to switch to the secondView. This, however, is not happening because navigationController logs as nil ! What am I missing here?
Any help is truly appreciated!
You don't have to create the window, it should already exist.
//_window = [[UIWindow alloc] initWithFrame:rect]; //remove this line
[self.window makeKeyAndVisible]; //use the ivar
[self.window addSubview:nc.view];
Related
I have read many other threads on this and the Apple docs, but haven't found a solution yet for my particular problem.
My app uses a UITabBarController as the rootViewController, and in one of the tabs I have a UISegmentedControl in the navigationBar to switch between three child UITableViewControllers.
(In the real app two of the childVCs are a custom UIViewController, I'm just using three UITableViewControllers for the sample app).
The segmentedControl setup and the switching all works fine. The thing that goes wrong is that only the first UITableViewController is shown correctly. For the second and third one, part of the first cell is hidden under the navigationBar. When I click through all three, the first one is still ok.
I have made a little sample app to show what's going on, using very bright colors for demonstration purposes: https://www.dropbox.com/s/7pfutvn5jba6rva/SegmentedControlVC.zip?dl=0
Here is also some code (I'm not using storyboards):
// AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
FirstViewController *fvc = [[FirstViewController alloc] init];
UINavigationController *firstNavigationController = [[UINavigationController alloc] initWithRootViewController: fvc];
SecondViewController *svc = [[SecondViewController alloc] init];
UINavigationController *secondNavigationController = [[UINavigationController alloc] initWithRootViewController: svc];
// Initialize tab bar controller, add tabs controllers
UITabBarController *tabBarController = [[UITabBarController alloc] init];
tabBarController.viewControllers = #[firstNavigationController, secondNavigationController];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.rootViewController = tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
// FirstViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.title = #"One";
self.view.backgroundColor = [UIColor orangeColor];
UITableViewController *vc1 = [[UITableViewController alloc] init];
UITableViewController *vc2 = [[UITableViewController alloc] init];
UITableViewController *vc3 = [[UITableViewController alloc] init];
vc1.view.backgroundColor = [UIColor redColor];
vc2.view.backgroundColor = [UIColor blueColor];
vc3.view.backgroundColor = [UIColor greenColor];
self.viewControllers = #[vc1, vc2, vc3];
self.segmentTitles = #[#"Red", #"Blue", #"Green"];
self.segmentedControl = [[UISegmentedControl alloc] initWithItems: self.segmentTitles];
[self.segmentedControl addTarget: self
action: #selector(segmentClicked:)
forControlEvents: UIControlEventValueChanged];
self.navigationItem.titleView = self.segmentedControl;
self.segmentedControl.selectedSegmentIndex = 0;
// set the first child vc:
UIViewController *vc = self.viewControllers[0];
[self addChildViewController: vc];
vc.view.frame = self.view.bounds;
[self.view addSubview: vc.view];
self.currentVC = vc;
}
- (void)segmentClicked:(id)sender
{
if (sender == self.segmentedControl)
{
NSUInteger index = self.segmentedControl.selectedSegmentIndex;
[self loadViewController: self.viewControllers[index]];
}
}
- (void)loadViewController:(UIViewController *)vc
{
[self addChildViewController: vc];
[self transitionFromViewController: self.currentVC
toViewController: vc
duration: 1.0
options: UIViewAnimationOptionTransitionFlipFromBottom
animations: ^{
[self.currentVC.view removeFromSuperview];
vc.view.frame = self.view.bounds;
[self.view addSubview: vc.view];
} completion: ^(BOOL finished) {
[vc didMoveToParentViewController: self];
[self.currentVC removeFromParentViewController];
self.currentVC = vc;
}
];
}
So obviously my question is, why does this happen, and what can I do to fix it?
Edit: adding screenshots.
EDIT: Based on the answer below I changed the code in the animation block to:
[self.currentVC.view removeFromSuperview];
if ([vc.view isKindOfClass: [UIScrollView class]])
{
UIEdgeInsets edgeInsets = UIEdgeInsetsMake(self.topLayoutGuide.length, 0, self.bottomLayoutGuide.length, 0);
[UIView performWithoutAnimation: ^{
vc.view.frame = self.view.bounds;
((UIScrollView *)vc.view).contentInset = edgeInsets;
((UIScrollView *)vc.view).scrollIndicatorInsets = edgeInsets;
}];
}
else
{
vc.view.frame = self.view.bounds;
}
[self.view addSubview: vc.view];
Now it works. I'm going to try this with a custom UIViewController as well.
The issue is that you do not set the correct content inset to each table view. The system attempts to do it for you, but I guess your setup is too complex for it, and it only does it for the first tableview that is loaded in viewDidLoad. In your loadViewController: method, when replacing the currently displayed view, make sure to set both the contentInset and scrollIndicatorInsets to the values of the previous view. I think the system will manage to set the correct insets later, in case you rotate to landscape. Try it. If it doesn't, you will need to do it on your own in viewDidLayoutSubviews.
I'm trying to create and set a View as the root View programmatically. I'm not using a Storyboard or ARC.
I'm trying to set a UIWebView as my ViewController's root View, which I'm unable to do. When I run the following code, I see a NavigationBar with a blank white screen. I tried setting a regular UIView as the root View and set its background color to blue, which loaded, so the problem seems to be specific to a UIWebView.
I'd really appreciate it if someone could point out what I'm doing wrong. Thanks!
Here is my loadView code:
// in GmailOAuthViewController.m
- (void)loadView {
CGRect frame = [[UIScreen mainScreen] bounds];
UIWebView *webView = [[[UIWebView alloc] initWithFrame:frame] autorelease];
self.view = webView;
}
And here is my application:didFinishLaunchingWithOptions: code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
CGRect frame = [[UIScreen mainScreen] bounds];
UIViewController *viewController = [[GmailOAuthViewController alloc] init];
self.navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
self.window = [[UIWindow alloc] initWithFrame:frame];
self.window.backgroundColor = [UIColor whiteColor];
self.window.rootViewController = self.navigationController;
[self.window makeKeyAndVisible];
return YES;
}
you are assigning self.view...
if you assign webView to view everything else is gone
try
[self.view addSubview: webView]
this is code i just tried and it works
CGRect frame = [[UIScreen mainScreen] bounds];
UIViewController *viewController = [[ViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
self.window = [[UIWindow alloc] initWithFrame:frame];
self.window.backgroundColor = [UIColor whiteColor];
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
in ViewController.m
-(void)viewDidAppear:(BOOL)animated{
CGRect frame = self.view.bounds;
UIWebView *webView = [[UIWebView alloc] initWithFrame:frame] ;
webView.delegate = self;
self.view = webView;
NSString *thePath = [[NSBundle mainBundle] pathForResource:#"ViewControllerCatalog" ofType:#"pdf"];
if (thePath) {
NSData *pdfData = [NSData dataWithContentsOfFile:thePath];
[(UIWebView *)self.view loadData:pdfData MIMEType:#"application/pdf"
textEncodingName:#"utf-8" baseURL:nil];
}
}
I apologize I told you wrong earlier you do in fact assign to view
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've recently started learning Obj-C and according to my friend (who is experienced with Obj-C), it's better if I learnt how to create a view programmatically and not rely on StoryBoards.
So... I've been trying to create a NavigationBar with a left button on it. But, when I run it, I get the actual NavigationBar, but not the button. Here's my code:
The AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc]
initWithFrame:[[UIScreen mainScreen] bounds]];
firstController = [[MainViewController alloc] init];
navController = [[UINavigationController alloc] initWithRootViewController:firstController];
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];
return YES;
}
and here's the MainViewController.m:
- (void)viewDidLoad
{
[super viewDidLoad];
UIColor *navbarColor = [UIColor whiteColor];
self.view.backgroundColor = [UIColor whiteColor];
self.navigationController.navigationBar.barTintColor = navbarColor;
UIBarButtonItem *button = [[UIBarButtonItem alloc]initWithTitle:#"Settings" style:UIBarButtonItemStylePlain target:self action:NULL];
self.navigationController.navigationItem.leftBarButtonItem = button;
}
Any help would be appreciated. I'm fairly new to Objective-C but I understand the code concept, so you don't need to "baby" talk it when explaining ^.^
add this line before [self.window makeKeyAndVisible];
[self.window addSubview:navController.view];