Blank Screen Issue in Simulator - xcode

I'm working on a game for the iPad, and I have it start up with a menu screen. For a while, the menu screen would come up just fine in the simulator. I'm using the main view controller that xcode provides when starting up a view-based application. But, unfortunately, I accidentally cut off the connection between the UIView and the view controller in interface builder, and after reconnecting it, the screen comes up as blank now. It works fine when I simulate the screen in interface builder, but not when running in xcode. Here's the code for the view controller:
//
// FunctionMachineViewController.h
// FunctionMachine
//
// Created by Kameron Schadt on 5/24/11.
// Copyright 2011 Willamette University. All rights reserved.
//
#import <UIKit/UIKit.h>
#interface FunctionMachineViewController : UIViewController {
IBOutlet UITextField* equation;
IBOutlet UISlider* startLevel;
IBOutlet UITextView* startLevelNumber;
}
- (IBAction) startOnePlayer:(id)sender;
- (IBAction) startTwoPlayer:(id)sender startingEquation:(NSString*)equationUsed;
- (IBAction) sliderValueChanged:(UISlider*)sender;
#property(nonatomic, retain) IBOutlet UISlider* startLevel;
#property(nonatomic, retain) IBOutlet UITextField* equation;
#property(nonatomic, retain) IBOutlet UITextView* startLevelNumber;
#end
//
// FunctionMachineViewController.m
// FunctionMachine
//
// Created by Kameron Schadt on 5/24/11.
// Copyright 2011 Willamette University. All rights reserved.
//
#import "FunctionMachineViewController.h"
#import "GameViewController.h"
#implementation FunctionMachineViewController
#synthesize equation, startLevel, startLevelNumber;
- (IBAction)sliderValueChanged:(UISlider*)sender {
[startLevelNumber setText:[NSString stringWithFormat:#" %.1f", [sender value]]];
}
-(IBAction)startOnePlayer:(id)sender
{
GameViewController* GameView = [[GameViewController alloc] initWithNibName:nil bundle:nil];
[GameView isOnePlayer:YES];
[self presentModalViewController:GameView animated:YES];
}
-(IBAction)startTwoPlayer:(id)sender startingEquation:(NSString*)equationUsed
{
GameViewController* GameView = [[GameViewController alloc] initWithNibName:nil bundle:nil];
[GameView isOnePlayer:NO];
[self presentModalViewController:GameView animated:YES];
}
- (void)viewDidLoad {
[super viewDidLoad];
}
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation {
return YES;
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
#end
I didn't really see any problem here, so I'm assuming it has something to do with me reconnecting the view controller to the view. I don't have an actual view file that I'm using, just the viewcontroller. Can anybody help?

Check the setting of "Main nib file base name" in [YourApp]-info.plist, in the "Supporting Files" folder – if you've changed the name of your root view controller, you may need to change the name here as well.

For some odd reason my Referencing outlet for the App Delegate was disconnected.
Try creating a referencing outlet from delegate to File's Owner using the connections inspector (farthest right menu) for your App Delegate.

Related

Black sceen trying to put a .Xib after Splash

I'm programming a App for iOS 8. I've a problem because i don't want use storyboard, I want to put a .xib file at the first time. Muy problem is that always, after splash be a black screen.
The Class who I want to put after Splash is LoginViewController
At general options, the "Main interface" is white (empty) (if put the name of the class, i've NSException (NSUknownException)).
In the .xib file i'have the files owner connected, and at the right side of the screen i've the name of the class at "Custom Class" (LoginViewController).
My appDelegate.h is: (I try with " #property (strong, nonatomic) LoginViewController *viewController;" too)
#import <UIKit/UIKit.h>
#import "LoginViewController.h"
#interface AppDelegate : UIResponder <UIApplicationDelegate>
#property (strong, nonatomic) UIWindow *window;
#property (strong, nonatomic) UIViewController *viewController;
#end
My appDelegate.m is: (i try a lot of variants)
#import "AppDelegate.h"
#import "LoginViewController.h"
#interface AppDelegate ()
#end
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.viewController = [[LoginViewController alloc] initWithNibName:#"LoginViewController" bundle:nil];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
navController.navigationBarHidden = YES;
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];
return YES;
}
- (void)applicationWillResignActive:(UIApplication *)application {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}
- (void)applicationDidEnterBackground:(UIApplication *)application {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
- (void)applicationWillEnterForeground:(UIApplication *)application {
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}
- (void)applicationDidBecomeActive:(UIApplication *)application {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
- (void)applicationWillTerminate:(UIApplication *)application {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
#end
The LoginViewController.h:
#import <UIKit/UIKit.h>
#interface LoginViewController : UIViewController
{
IBOutlet UILabel *labelPrueba;
IBOutlet UIButton *botonPrueba;
IBOutlet UIButton *boton2prueba;
IBOutlet UILabel *label2Prueba;
IBOutlet UILabel *dsfd;
IBOutlet UIButton *dfdf;
}
#end
The LoginViewController.m:
#import "LoginViewController.h"
#interface LoginViewController ()
#end
#implementation LoginViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
label2Prueba.text = #"laaaaaaaaaaaaa";
NSLog(#"Entra en viewDidLoad");
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#end
Someone can help me please. I'm going crazyyyyy.
Thanks a lot.
The solution was put this windows like init frame:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// That was the solution
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// That was the solution
self.viewController = [[LoginViewController alloc] initWithNibName:#"LoginViewController" bundle:nil];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
navController.navigationBarHidden = YES;
self.window.rootViewController = navController;
[self.window makeKeyAndVisible];
return YES;
}
Thanks

switching views with NSMenuItem IBAction does not work

In a document based Cocoa App I want to fill a NSBox in the Document.xib with a view,
by selecting the view with a NSMenuItem. However, the box is not updated with the view.
If I insert a button in the Document.xib, which is connected with the same IBAction as the NSMenuItem, the app works in the expected way.
I created the tree files:
- ViewController.h
- ViewController.m
- prettyView.xib
In ViewController.m the XIB File of the view is initialized.
// ViewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (id)init
{
if(![super initWithNibName:#"prettyView" bundle:nil]){
return nil;
}
[self setTitle:#"Pretty View"];
return self;
}
#end
The Document.h contains outlets for the box and two buttons.
One button fills the box with the view, the other one clears the box.
// Document.h
#import <Cocoa/Cocoa.h>
#class ViewController;
#interface Document : NSDocument
#property (weak) IBOutlet NSBox *contentBox;
- (IBAction)fillBox:(id)sender;
- (IBAction)clearBox:(id)sender;
#property ViewController * myViewController;
#end
In Document.m the view controller is instantiated.
// Document.m
#import "Document.h"
#import "ViewController.h"
#interface Document ()
#end
#implementation Document
- (instancetype)init {
self = [super init];
if (self) {
_myViewController = [ViewController new];
}
return self;
}
The methods for the IBActions are implemented in Document.m too.
- (IBAction)fillBox:(id)sender {
NSLog(#"Fill Box selected from %#", [sender className]);
[self.contentBox setContentView:[self.myViewController view]];
}
- (IBAction)clearBox:(id)sender {
NSLog(#"Clear Box selected");
[self.contentBox setContentView:nil];
}
The method fillBox is connected to one of the both buttons as well as to the NSMenuItem.
Pressing the button, a message is written to the console and the view is shown in the box.
Selecting the NSMenuItem, a message is written too, but the view is not displayed in the box.
The IBActions must not be connected with Document but with First Responder of MainMenu.xib.

XCode Multiple implementations in separate views with UITextView not updating

Hey I just had a question regarding XCode's behavior with multiple views implementing the same UIView class of my own creation. I am working with a tabbed application and controller, and I have multiple views on the storyboard, all of which implement a class that I created. On one of the views, I have a text field and a button, and on another, I have a text view with a startup text reading "Waiting...". As you can probably guess, I want to enter text into the text field on the first view, press the button, then display the proper output text in the textview on the other view.
My question is: is there a problem with implementing the same class between multiple views?
I have researched numerous discussions on the TextView method of setting text inside of it, but all of the suggestions between the forums say something different, and none of the methods seem to work appropriately.
[textView setText string] doesn't want to work when I switch to the other tab,
textView.text = #"Message here" doesn't work either
I'd appreciate your help, and I've attached my code for reference.
#import "MasterController.h"
#interface MasterController ()
#end
#implementation MasterController
#synthesize input;
#synthesize output;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)viewDidUnload
{
[self setInput:nil];
[self setOutput:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (IBAction)generate:(id)sender
{
[output setText:input.text];
}
- (IBAction)textFieldReturn:(id)sender
{
[sender resignFirstResponder];
}
- (void)dealloc
{
[input release];
[output release];
[super dealloc];
}
#end
//MasterController.h
#import <UIKit/UIKit.h>
#interface MasterController : UIViewController
- (IBAction)generate:(id)sender;
- (IBAction)textFieldReturn:(id)sender;
#property (retain, nonatomic) IBOutlet UITextField *input;
#property (retain, nonatomic) IBOutlet UITextView *output;
#end
If you have several views that are controlled by the same view controller, they will not communicate with each other in the way that you are trying to make them. When you call [output setText:input.text] , you are saying: set the text for the output text field for the view that you are currently on.
One somewhat hacky way of getting around this is to create a second view controller and have it inherit from your "Master." Variables are set as protected as default and will retain their information when subclassed.
If you want to communicate between the different view controllers properly, however, you should look into state injection in this question: What's the best way to communicate between view controllers? Or use a communication system such as NSNotification center. Or you could use NSCoding, all of which are fairly easy to implement.

How to increase scroll speed of UIWebView?

I have an app that uses a UIWebView on one of it's tabs.
Everything is working like it should, but the speed that the view is scrolling is extremely slow! It doesn't matter if I build it in the simulator or if I build it in my iPhone, it's the same slow scroll.
How can I increase the scrolling speed of the view? I've noticed that it will stop scrolling as soon as the finger leaves the screen, instead of keep scrolling and decelerate like in safari, does this have anything to do with it?
The is my .h file:
// FirstViewController_SE.h
// WebApp
//
// Created by Camilla Fröberg on 2012-03-29.
// Copyright (c) 2012 SafeLine Sweden AB. All rights reserved.
//
#import <UIKit/UIKit.h>
#interface FirstViewController_SE : UIViewController<UIWebViewDelegate> {
IBOutlet UIWebView *webDisplay_SE;
UIBarButtonItem* mBack;
UINavigationItem* back;
}
#property(nonatomic,retain) UIWebView *webDisplay_SE;
#property (nonatomic, retain) IBOutlet UIBarButtonItem* back;
- (void)updateButtons;
#end
And this is my .m file:
//
// FirstViewController_SE.m
// WebApp
//
// Created by Camilla Fröberg on 2012-03-29.
// Copyright (c) 2012 SafeLine Sweden AB. All rights reserved.
//
#import "FirstViewController_SE.h"
#interface FirstViewController_SE ()
#end
#implementation FirstViewController_SE;
#synthesize webDisplay_SE;
#synthesize back = mBack;
#pragma mark - View lifecycle
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
self.webDisplay_SE.delegate = self;
NSString *urlAddress = #"http://www.safeline.eu/mobile/se/product";
//Create a URL object.
NSURL *url = [NSURL URLWithString:urlAddress];
//URL Requst Object
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
//Load the request in the UIWebView.
[webDisplay_SE loadRequest:requestObj];
[self updateButtons];
}
- (void)viewDidUnload {
self.back = nil;
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
- (void)updateButtons
{
self.back.enabled = self.webDisplay_SE.canGoBack;
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (BOOL)webDisplay_SE:(UIWebView *)webDisplay_SE shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
return YES;
}
- (void)webViewDidStartLoad:(UIWebView *)webDisplay_SE
{
[self updateButtons];
}
- (void)webViewDidFinishLoad:(UIWebView *)webDisplay_SE
{
[self updateButtons];
}
#end
Try this:
webView.scrollView.decelerationRate = UIScrollViewDecelerationRateNormal;
Note: there's a bug in iOS 9 that you may need to workaround https://stackoverflow.com/a/32843700/308315

How can I use shake gesture when using storyboards?

I've made an application where you shake the phone to open a new view. All together three views, and when you shake the phone on the last view you go back to the first screen. This works fine when I'm creating new subclass controls view with their own .xib. But I would like to use this in a storyboard project, what do I need to change?
Thanks a lot on beforehand!
HERE IS THE CODE IN .H:
#import <UIKit/UIKit.h>
#import "FirstScreenViewController.h"
#import "SecondScreenViewController.h"
#interface ViewController : UIViewController
{
NSInteger currentScreen;
UIViewController* currentController;
}
#end
AND HERE IN THE .M:
#import "ViewController.h"
#implementation ViewController
-(void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark shake
-(BOOL)canBecomeFirstResponder
{
return true;
}
-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
if(motion == UIEventSubtypeMotionShake)
{
if (currentController)
{
[currentController.view removeFromSuperview];
currentController=nil;
}
switch (currentScreen)
{
case 0:
currentController = [[FirstScreenViewController alloc] initWithNibName:#"FirstScreenViewController" bundle:nil];
break;
case 1:
currentController = [[SecondScreenViewController alloc] initWithNibName:#"SecondScreenViewController" bundle:nil];
}
if(currentController)
{
[currentController.view setFrame:self.view.bounds];
[self.view addSubview:currentController.view];
}
currentScreen++;
if(currentScreen >2)
currentScreen=0;
}
}
#pragma mark - View lifecycle
-(void)viewDidLoad
{
[super viewDidLoad];
currentScreen = 0;
}
-(void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
#end
You need to add all three view controllers to the storyboard, and have segues between them (including one back to the first from the third) and a shake gesture recogniser attached to each scene.
The action method for each gesture recogniser tells the view controller to performSegue: with the appropriate segue identifier.

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