I've recently created a app with Xcode. When 2 images collide, it sends me to a new screen (which is good). However, when i push the button to return me back to the original view, it goes blank. Can you tell me why? Any feed back is appreciated.
Here is code from the First .h file:
import
#interface ViewController : UIViewController {
IBOutlet UIImageView *image1;
IBOutlet UIImageView *image2;
}
#property (nonatomic, retain) UIImageView *image1;
#property (nonatomic, retain) UIImageView *image2;
-(void)collision;
#end
And from the .m:
import "ViewController.h"
import "newview.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize image1, image2;
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *mytouch = [[event allTouches] anyObject];
image1.center = [mytouch locationInView:self.view];
[self collision];
}
-(void)collision {
if (CGRectIntersectsRect(image1.frame, image2.frame)) {
newview *second = [[newview alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:second animated:YES];
}
}
here is code from the second .h (The one with the go back button):
(IBAction)retry:(id)sender;
and from the .m:
import "newview.h"
import "ViewController.h"
#interface newview ()
#end
#implementation newview
(IBAction)retry:(id)sender {
ViewController *second = [[ViewController alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:second animated:YES];
}
The blank screen is another modal view from (IBAction)retry:(id)sender.
You should use [self dismissModalViewControllerAnimated:YES]; in (IBAction)retry:(id)sender for going back to previous screen instead of presenting another modal view.
Related
I've got a problem with xcode.
I'm a noob with object-c and xcode so... please help.
I have 2 Viewcontrollers: ViewController (with .m/.h) and HighScores (with .m/.h).
In HighScores I have put a label called first. And in ViewController I have a UITextField called *textField. I want the text in textField to be in the label when I enter the text AND when the score of the game already played is grater than the text already existing in the label ('first').
So,
This is how my HighScore.h looks like:
#import <UIKit/UIKit.h>
#interface HighScores: UIViewController {
IBOutlet UILabel *first;
}
#end
and this is ViewController.m:
#import "ViewController.h"
#import "HighScore.h"
...
NSString *myString = [HighScores.first];
if (score.text > myString) {
NSString *string = [textField text];
[HighScores.first setText:string]
but xcode says there's an error when I type "first" after the dot '.'... How can I make it if I want xCode to recognize the "first" label from HighScore UIViewController in VewController UiViewController?
Thanks!
In your code "first" is a UILabel , it will be generated when view of highScores get loaded .
Because it is a IBOUtlet.
Secondly you are trying yo access with class name .
Make a instance of HighScore class first and than try to acess label "first".
#import <UIKit/UIKit.h>
#interface HighScores: UIViewController
#property (nonatomic , strong)UILabel *firstLabel ;
#end
#implementation HighScores
- (id)initWithNibName:(NSString *)nibName bundle:(NSBundle *)nibBundle
{
self.firstLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
[self.view addSubview self.firstlabel];
}
#end
than in ViewController.m
HighScore * highscoreObject = [[HighScore alloc]init];
NSString *mystring = [highscoreObject.firstLabel text];
if (score.text > mystring) {
[highscoreObject.firstLabel setText:score.text];
{
Lets use notification , if you are confused in here:
In this case you can also use IBoutlet.
We will throw an notification with the string to be set and read the notification in HighScores and set the label with the string send.
In ViewController.m
if (score.text > myString) {
NSString *string = [textField text];
[[NSNotificationCenter defaultCenter] postNotificationName:#"update" object:string];
}
#interface HighScores: UIViewController
#property (nonatomic , strong) IBOutlet UILabel *firstLabel ;
#end
and in HighScores.m
#implementation HighScores
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] removeObserver:self];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(changetext:) name:#"update" object:nil];
}
- (void) changetext:(NSNotification *)notification {
NSLog(#"Received");
self.firstLabel.text = [notification object];
}
I have an app with ads banner (inner-active) in every view controller (4 views) and i keep getting this error after 2-3-4 minutes that my app is running:
'NSRangeException', reason: '*** -[__NSCFString substringToIndex:]: Range or index out of bounds'
My app is crashing & i can't find the solution for that, but i know for sure that is something with my AD banner issue cau's when i comment the ad banner code everything works great. i can assume that it happens when new request is loading on the banner.
This is the code i'm using for the AD banner:
.h file:
#property (nonatomic, retain) UIView *adBanner;
.m file:
Did synthesize & import for what i need and after that:
- (void)viewWillAppear:(BOOL)animated
{
CGRect frame = CGRectMake(0, 430, 320, 50);
self.adBanner = [[UIView alloc] initWithFrame:frame];
[self.view addSubview:self.adBanner];
// Display ad
if (![InneractiveAd DisplayAd:#"iOS_Test" withType:IaAdType_Banner withRoot:adBanner withReload:60 withParams:optionalParams])
{
adBanner.hidden = YES;
}
}
This is my AppDelegate (don't know why but maybe it something with that too?):
.h file:
#import <UIKit/UIKit.h>
#class RootViewController;
#interface AppDelegate : UIResponder <UIApplicationDelegate>
#property (strong, nonatomic) UIWindow *window;
#property (nonatomic, strong) RootViewController *rootViewController;
#end
.m file:
#import "AppDelegate.h"
#import "RootViewController.h"
#implementation AppDelegate
#synthesize window = _window;
#synthesize rootViewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.rootViewController = [[RootViewController alloc] initWithNibName:nil bundle:NULL];
[self.window addSubview:self.rootViewController.view];
[self.window makeKeyAndVisible];
return YES;
}
I realy don't understand what it could be and how it related to NSCFString :\
Thanks.
Not sure if you got an answer to this but I was getting it with this line of code when there was no internet connection.
NSString *value = [serverOutput substringWithRange:NSMakeRange(2, [serverOutput length] - 2 * 2)];
I had to protect it with a check to the internet connection and an if then statement
I'm in the process of learning how to write apps in Xcode. I'm using a book to guide me. Unfortunately the book is written with guides to Xcode 3 and I'm using Xcode 4.
Now so far there haven't been any problems, but this project doesn't work, and I simply don't get it, because it seems to make pretty good sense.
The project's goal is to use a view controller to switch between three views.
Could anyone please take a look and see what I did wrong?
Here is the entire project: http://www.2shared.com/file/CKO6ACzg/MultipleViews.html
PS: I know that as it is now the views will be stacked on top off each other and that the view isn't being cleared when you click a new button.
MultipleViewsViewController.h should be:
#import <UIKit/UIKit.h>
#class FirstViewController;
#class SecondViewController;
#class ThirdViewController;
#interface MultipleViewsViewController : UIViewController {
IBOutlet FirstViewController *firstViewController;
IBOutlet SecondViewController *secondViewController;
IBOutlet ThirdViewController *thirdViewController;
}
//#property (nonatomic, retain) FirstViewController *firstViewController;
//#property (nonatomic, retain) SecondViewController *secondViewController;
//#property (nonatomic, retain) ThirdViewController *thirdViewController;
-(IBAction)loadFirstView:(id)sender;
-(IBAction)loadSecondView:(id)sender;
-(IBAction)loadThirdView:(id)sender;
#end
MultipleViewsViewController.m should be:
#import "MultipleViewsViewController.h"
#import "FirstViewController.h"
#import "SecondViewController.h"
#import "ThirdViewController.h"
#implementation MultipleViewsViewController
//#synthesize firstViewController;
//#synthesize secondViewController;
//#synthesize thirdViewController;
-(IBAction)loadFirstView:(id)sender{
[secondViewController.view removeFromSuperview];
[thirdViewController.view removeFromSuperview];
[self.view insertSubview:firstViewController.view atIndex:0];
}
-(IBAction)loadSecondView:(id)sender{
[firstViewController.view removeFromSuperview];
[thirdViewController.view removeFromSuperview];
[self.view insertSubview:secondViewController.view atIndex:0];
}
-(IBAction)loadThirdView:(id)sender{
[firstViewController.view removeFromSuperview];
[secondViewController.view removeFromSuperview];
[self.view insertSubview:thirdViewController.view atIndex:0];
}
-(void)dealloc{
[firstViewController release];
[secondViewController release];
[thirdViewController release];
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
firstViewController = [[FirstViewController alloc] init];
secondViewController = [[SecondViewController alloc] init];
thirdViewController = [[ThirdViewController alloc] init];
[self loadFirstView:nil];
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
Connect your buttons (which you haven't done in your project, which also might be the issue) and you're done.
EDIT 1: changed the code to:
delegate.h:
#import <UIKit/UIKit.h>
#class ViewController;
#interface AppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
ViewController *viewController;
UIImageView *splashView;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet ViewController *viewController;
#property (nonatomic, retain) IBOutlet UIImageView *splashView;
- (void)removeSplash;
#end
delegate.m:
#import "AppDelegate.h"
#import "ViewController.h"
#implementation AppDelegate
#synthesize window;
#synthesize viewController;
#synthesize splashView;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
splashView.image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"Splash" ofType:#"png"]];
[window addSubview:splashView];
[window bringSubviewToFront:splashView];
[window makeKeyAndVisible];
[self performSelector:#selector(removeSplash) withObject:nil afterDelay:5.0];
[window addSubview:viewController.view];
return YES;
}
- (void)removeSplash {
[splashView removeFromSuperview];
[splashView release];
}
- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
}
#end
EDIT 2:
when I use:
splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
splashView.image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"Splash" ofType:#"png"]];
if (splashView.image == nil) {
NSLog(#"splashView is nil");
}
it logs "splashView is nil"
My Viewcontroller is empty, just for debugging purposes.
As you probably already know, splash screens are discouraged. Since your image is Default.png, isn't it already being shown on app launch automatically?
In any case, the sleep() call is probably blocking the UI. Remove the sleep() and move the statements after it (the removeFromSuperview, etc) to another method in the app delegate. Call this method using performSelector:withObject:afterDelay:. Put the performSelector call where you currently have the sleep call.
Also, you should use the didFinishLaunchingWithOptions method instead of the old applicationDidFinishLaunching method.
I'm trying to build an app where I have a TabBarController with 4 entries.
When I select the first entry, a view with a UITableView shows up.
This TableView is filled with several entries.
What I would like to do is:
When an entry out of that UITableView gets selected, another view should show up; a detailview.
.m
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row == 0) {
if(self.secondView == nil) {
SecondViewController *secondViewController = [[SecondViewController alloc] initWithNibName:#"SecondView" bundle:[NSBundle mainBundle]];
self.secondView = secondViewController;
[secondViewController release];
}
// Setup the animation
[self.navigationController pushViewController:self.secondView animated:YES];
}
}
.h
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
#interface FirstViewController : UIViewController {
SecondViewController *secondView;
NSMutableArray *myData;
}
#property (nonatomic, retain) SecondViewController *secondView;
#property (nonatomic, copy, readwrite) NSMutableArray* myData;
#end
This is what I have so far.
Unfortunately.. the code runs, bit the second view does not show up.
Is your first view controller wrapped in a UINavigationController? When you set up your UITabBarController, you should add UINavigationControllers rather than your UIViewController subclasses, e.g.:
FirstViewController *viewControl1 = [[FirstViewController alloc] init];
UINavigationController *navControl1 = [[UINavigationController alloc] initWithRootViewController:viewControl1];
UITabBarController *tabControl = [[UITabBarController alloc] init];
tabControl.viewControllers = [NSArray arrayWithObjects:navControl1, <etc>, nil];
//release everything except tabControl
Also, based on your code, you don't need to keep your secondViewController as an ivar, since UINavigationController automatically retains its view controllers (and retaining it when you're not displaying it will use up unnecessary memory).