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];
Related
I am using the following code in my app delegate to programmatically create the application's window and root controller:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.rootViewController = [[UIViewController alloc] init];
self.window.rootViewController.view = [[UIView alloc] init];
self.window.rootViewController.view.backgroundColor = [UIColor redColor];
return TRUE;
}
The code works fine, however the view associated to the root view controller overlaps the status bar, which I would like to avoid (see picture below).
How should I proceed? In particular I want to have a lightgray background for the status bar (similar to the apps created with a storyboard) and also handle orientation change correctly.
Thanks
Well, you can do something as following:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.rootViewController = [[UIViewController alloc] init];
self.window.rootViewController.view.backgroundColor = [UIColor whiteColor];
UIView *redView = [[UIView alloc] initWithFrame:CGRectMake(0,
[UIApplication sharedApplication].statusBarFrame.size.height,
[UIScreen mainScreen].bounds.size.width,
[UIScreen mainScreen].bounds.size.height)];
redView.backgroundColor = [UIColor redColor];
[self.window.rootViewController.view addSubview:redView];
[self.window makeKeyAndVisible];
return TRUE;
}
should look like this:
I copied the example from View Controller Catalog for iOS made some changes to the colour and expected to see them reflected on the simulator. Nothing happens ???
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
UIViewController *myViewController = [[MyViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:myViewController];
[navigationController setNavigationBarHidden:NO animated:YES];
navigationController.title = #"Hello";
navigationController.navigationBar.barStyle = UIBarStyleBlack ;
navigationController.navigationBar.translucent = NO;
navigationController.navigationBar.tintColor = [UIColor blackColor];
navigationController.navigationBar.barTintColor = [UIColor greenColor];
UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
window.rootViewController = navigationController;
[window makeKeyAndVisible];
return YES; }
What do I do wrong?
Several things: First: be sure than in the General information of your target app, in Main Interface field is blank. (If you don´t find it, delete all *.storyboard files that you have).
Second: In your AppDelegate.h should be this property:
#property (strong, nonatomic) UIWindow *window;
And last: Change this in your code:
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.rootViewController = navigationController;
[self.window makeKeyAndVisible];
In order to know changes is better step by step. (.title is in ViewController).
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
MainViewController *rootViewController = [[MainViewController alloc] init];
_naviControl = [[UINavigationController alloc]initWithRootViewController:rootViewController];
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
[self.window addSubview:_naviControl.view];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
In my AppDelegate ..!
Connect to MainViewController.m
The AppDelegate is not a UIViewController so connecting a UITableView to it conflicts with the MVC principles as described here: https://developer.apple.com/library/ios/documentation/general/conceptual/devpedia-cocoacore/MVC.html
what you want to do is make your MainViewController's view have a tableView as a subview
something like this:
(in MainViewController.m)
- (void)viewDidLoad {
[super viewDidLoad];
self.feedTableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
self.feedTableView.dataSource = self;
self.feedTableView.delegate = self;
[self.view addSubview:self.feedTableView];
}
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];
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];