So I'm declaring a NSMutableArray to hold 5 UIImageViews.
.h file:
#interface ImageDisplay : UIViewController {
IBOutlet UIImageView *img1;
IBOutlet UIImageView *img2;
IBOutlet UIImageView *img3;
IBOutlet UIImageView *img4;
IBOutlet UIImageView *img5;
NSMutableArray *imageHolderArray;
}
#property (nonatomic, retain) IBOutlet UIImageView *img1;
#property (nonatomic, retain) IBOutlet UIImageView *img2;
#property (nonatomic, retain) IBOutlet UIImageView *img3;
#property (nonatomic, retain) IBOutlet UIImageView *img4;
#property (nonatomic, retain) IBOutlet UIImageView *img5;
#property (nonatomic, retain) IBOutlet NSMutableArray *imageHolderArray;
#end
In the .m file:
//All objects are synthesized, just easier not to crowd the screen
- (void)viewDidLoad {
[super viewDidLoad];
imageHolderArray = [[NSMutableArray alloc] initWithObjects: img1,img2,img3,img4,img5,nil];
NSLog(#"imageHolderArray count: %i",[imageHolderArray count]); //Returns count of 1
}
So my question is, why is this happening? Why isn't it picking up all the objects in the Array? I'm not well versed in Objective-C programming so I'd appreciate it if someone could clue me in here. Thank you.
Because you didn't wire the IBOutlets to their views in Interface Builder. Looks like you probably wired img1, but didn't wire img2, so img2 is nil, which marks the end of your list of objects for -initWithObjects: even if later outlets are wired.
Related
I am using the storyboard to create a UIView that contains a UIScrollView that has many child items in it. these child items consist of a UIImageView that I am using as a background image for the UIScrollView, a series of UILabels that I populate programmatically, and a series of UITableViews that I populate with data obtained from a called set of library classes. I want all of this in my UIScrollView so the User can scroll through all of the information without having multiple views being displayed. I have browsed through a lot of postings here and have used a lot of the suggestions, but have been unable to successfully have the view scroll and allow the user to see all the data I'm attempting to present.
Here's a screen shot of the Storyboard followed by a shot of the attribute inspector for my UIScrollView
I'll also provide the .h and .m files
weatherController.h
#import <UIKit/UIKit.h>
#import "WeatherParser.h"
#import "WeatherLocation.h"
#import "WeatherImg.h"
#import "WeatherWind.h"
#import "ForcastDay.h"
#import "ForecastItem.h"
#import "Condition.h"
#import "Atmo.h"
#import "Astro.h"
#class WeatherParser;
#class WeatherParserDelegate;
#class WeatherLocation;
#class WeatherImg;
#class WeatherWind;
#class ForcastDay;
#class ForecastItem;
#class Condition;
#class Atmo;
#class Astro;
#interface weatherController : UIViewController <UITableViewDataSource,UITableViewDelegate,WeatherParserDelegate>{
WeatherParser * _rssParser;
bool loadingEvents;
}
#property (nonatomic, retain) WeatherParser * rssParser;
#property bool loadingEvents;
#property (retain, nonatomic) IBOutlet UIScrollView *scrollView;
#property (weak, nonatomic) IBOutlet UILabel *cityLabel;
#property (weak, nonatomic) IBOutlet UILabel *state_countryLabel;
#property (weak, nonatomic) IBOutlet UILabel *currHighLabel;
#property (weak, nonatomic) IBOutlet UILabel *currLowLabel;
#property (weak, nonatomic) IBOutlet UILabel *currTempLabel;
#property (weak, nonatomic) IBOutlet UIImageView *imageView;
#property (weak, nonatomic) IBOutlet UIImageView *logoImageView;
#property (weak, nonatomic) IBOutlet UILabel *logoLabel;
#property (weak, nonatomic) IBOutlet UITableView *forecastTableView;
#property (weak, nonatomic) IBOutlet UITableView *atmoTableView;
#property (weak, nonatomic) IBOutlet UITableView *windTableView;
#property (weak, nonatomic) IBOutlet UITableView *astroTableView;
#property (weak, nonatomic) IBOutlet UIBarButtonItem *sidebarButton;
#property (nonatomic, retain) NSMutableArray *forecastDays;
#property bool logoSet;
#end
and here's my weatherController.m file. I'm going to only add the viewDidLoad method which is the only method containing code regarding my UIScrollView.
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
_scrollView.delegate = self;
// self.scrollView.frame = CGRectMake(0, 0, 320.0f, 480.0f);
self.scrollView.contentSize =CGSizeMake(320.0F, 480.0F); //(320, 1210)];
[_scrollView setScrollEnabled:YES];
}
I would appreciate any help regarding what it is I'm either doing wrong or missing. If I set up my frame and contentSize to the following:
self.scrollView.frame = CGRectMake(0, 0, 320.0f, 480.0f);
self.scrollView.contentSize =CGSizeMake(320.0F, 1210.0F);
I do get the UIScrollView to scroll, but the image for the background is only the size of the frame, and none of the rest of the child content on the UIScrollView is displayed. It seems like it's allowing me to scroll but I'm only able to view the content that is viewable within the frame.
Again, thank you in advance for any help offered.
As the comments are suggesting, it's generally a bad idea to put a UITableView within a UIScrollView. I won't be too hard on you though, because there is a time and place where it is an acceptable solution. I'll let you judge if this time is now or not.
For reasons I still don't fully understand, UIScrollView behaves more like you expect it to if you enclose the entire contents in a single UIView that is as big as you want the UIScrollView to scroll.
It`s probably a very silly mistake, but I've spent over 4 days looking for a solution for this.
It is very simple, I´ve got my MainView.xib and a view called FirstViewController (h/m/xib).
In MainWindow.xib I add a UIViewController and change the class name to FirstViewController and set the Nib name also (altouhg I've tried both ways).
I guess it has to do something with outlets, but I can`t really tell, as I am a newbie developing for iOS, any help wil REALLY help a lot.
Im using XCode 3.2 and interface builder, with SDK 4.3
AppDelegate
#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#interface iPadTerritorioV2AppDelegate : NSObject <UIApplicationDelegate> {
IBOutlet UIWindow *window;
IBOutlet UIViewController *navigationController;
NSString *devToken;
NSString *matricula;
NSString *campus;
NSMutableArray *materiasAlumno; //para CCM
NSMutableArray *busqDir; //para CCM
NSInteger agendaBadgeNumber;
NSInteger intramurosBadgeNumber;
NSInteger notificacionesBadgeNumber;
NSInteger mapaBadgeNumber;
NSMutableData *receivedData;
NSMutableDictionary *listData;
BOOL yaSeHizoElPrimerFetchBadges;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet UIViewController *navigationController;
#property (nonatomic, retain) NSString *devToken;
#property (nonatomic, retain) NSString *matricula;
#property (nonatomic, retain) NSString *campus;
#property (nonatomic, retain) NSMutableArray *materiasAlumno;
#property (nonatomic, retain) NSMutableArray *busqDir;
#property NSInteger agendaBadgeNumber;
#property NSInteger intramurosBadgeNumber;
#property NSInteger notificacionesBadgeNumber;
#property NSInteger mapaBadgeNumber;
#property (nonatomic, retain) NSMutableData *receivedData;
#property (nonatomic, retain) NSMutableDictionary *listData;
#property BOOL yaSeHizoElPrimerFetchBadges;
- (void)fetchBadges;
#end
FirstViewController.h
#import <UIKit/UIKit.h>
#import "Constants.h"
#import "StringDecoding.h"
#define kConnectionBadgeNotifications 0
#define kConnectionLogin 1
#define kConnectionDevToken 2
#define kCCMindex 0
#define kCSFindex 1
#define kMTYindex 2
#interface FirstViewController : UIViewController {
IBOutlet UISegmentedControl *segmentedCampus;
IBOutlet UITextField *usernameField;
IBOutlet UITextField *passwordField;
IBOutlet UISwitch *remembermeSwitch;
IBOutlet UIButton *loginButton;
UIActivityIndicatorView *loginIndicator;
NSMutableDictionary *listData;
NSMutableData *receivedData;
NSInteger connectionID;
}
#property (nonatomic, retain) UISegmentedControl *segmentedCampus;
#property (nonatomic, retain) UITextField *usernameField;
#property (nonatomic, retain) UITextField *passwordField;
#property (nonatomic, retain) UIActivityIndicatorView *loginIndicator;
#property (nonatomic, retain) UISwitch *remembermeSwitch;
#property (nonatomic, retain) UIButton *loginButton;
#property (nonatomic, retain) NSMutableDictionary *listData;
#property (nonatomic, retain) NSMutableData *receivedData;
#property NSInteger connectionID;
- (IBAction)handleNextClick:(id) sender;
- (IBAction)backgroundClick;
- (IBAction)login: (id) sender;
#end
It sounds like your FirstViewController isn't being retained - if it's not assigned to an outlet anywhere, nothing's retaining it and it'll just disappear. Add a property somewhere (your AppDelegate, perhaps, if that's all you've got) and connect it to the controller:
#property (nonatomic, retain) IBOutlet UIViewController *firstViewController;
I've been staring at this for way too long.
There's nothing fancy happening here, and I've done this dozens of times, yet Interface Builder steadfastly refuses to provide me an action target for -(IBAction)slideDirections. I'm at the point where I'm willing to post publicly and feel stupid. So let 'er rip.
Here's my .h:
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#interface PulseDetailController : UIViewController {
NSDictionary *pulse;
IBOutlet MKMapView *map;
IBOutlet UIWebView *directions;
IBOutlet UIView *directionsSlider;
BOOL directionsExtended;
IBOutlet UILabel *vendor;
IBOutlet UILabel *offer;
IBOutlet UILabel *offerText;
IBOutlet UILabel *hours;
IBOutlet UILabel *minutes;
IBOutlet UILabel *seconds;
IBOutlet UILabel *distance
}
#property (nonatomic, retain) NSDictionary *pulse;
#property (nonatomic, retain) MKMapView *map;
#property (nonatomic, retain) UIWebView *directions;
#property (nonatomic, retain) UIView *directionsSlider;
#property (nonatomic) BOOL directionsExtended;
#property (nonatomic, retain) UILabel *vendor;
#property (nonatomic, retain) UILabel *offer;
#property (nonatomic, retain) UILabel *offerText;
#property (nonatomic, retain) UILabel *hours;
#property (nonatomic, retain) UILabel *minutes;
#property (nonatomic, retain) UILabel *seconds;
#property (nonatomic, retain) UILabel *distance;
-(IBAction)slideDirections;
#end
Shouldn't the IBAction have a sender parameter?
Like:
-(IBAction)slideDirections:(id)sender;
Sometimes Interface Builder seems to get out of sync with classes in Xcode. Have you tried forcing interface builder to reread your PulseDetailController header file? (File -> Read Class Files... -> Select 'PulseDetailController.h'). This should force Interface Builder to see your new action.
Which objects are you trying to connect?
From your header, the logical choice would be UIView *directionsSlider
If you are ctrl dragging from directionsSlider to the "File's Owner" object, make sure that the Class in "File's Owner" is set to PulseDetailController.
I'm trying to play a sound based on which button is pressed using AVAudioPlayer.
(This is not a soundboard or fart app.)
I have linked all buttons using this code in the header file:
#interface appViewController : UIViewController <AVAudioPlayerDelegate> {
AVAudioPlayer *player;
UIButton *C4;
UIButton *Bb4;
UIButton *B4;
UIButton *A4;
UIButton *Ab4;
UIButton *As4;
UIButton *G3;
UIButton *Gb3;
UIButton *Gs3;
UIButton *F3;
UIButton *Fs3;
UIButton *E3;
UIButton *Eb3;
UIButton *D3;
UIButton *Db3;
UIButton *Ds3;
UIButton *C3;
UIButton *Cs3;
}
#property (nonatomic, retain) AVAudioPlayer *player;
#property (nonatomic, retain) IBOutlet UIButton *C4;
#property (nonatomic, retain) IBOutlet UIButton *B4;
#property (nonatomic, retain) IBOutlet UIButton *Bb4;
#property (nonatomic, retain) IBOutlet UIButton *A4;
#property (nonatomic, retain) IBOutlet UIButton *Ab4;
#property (nonatomic, retain) IBOutlet UIButton *As4;
#property (nonatomic, retain) IBOutlet UIButton *G3;
#property (nonatomic, retain) IBOutlet UIButton *Gb3;
#property (nonatomic, retain) IBOutlet UIButton *Gs3;
#property (nonatomic, retain) IBOutlet UIButton *F3;
#property (nonatomic, retain) IBOutlet UIButton *Fs3;
#property (nonatomic, retain) IBOutlet UIButton *E3;
#property (nonatomic, retain) IBOutlet UIButton *Eb3;
#property (nonatomic, retain) IBOutlet UIButton *D3;
#property (nonatomic, retain) IBOutlet UIButton *Db3;
#property (nonatomic, retain) IBOutlet UIButton *Ds3;
#property (nonatomic, retain) IBOutlet UIButton *C3;
#property (nonatomic, retain) IBOutlet UIButton *Cs3;
- (IBAction) playNote;
#end
Buttons are all linked to the event "playNote" in interfaceBuilder and each note is linked to the proper referencing outlet according to note name.
All *.mp3 sound files are named after the UIButton name (IE- C3 == C3.mp3).
In my implementation file, I have this to play a only one note when the C3 button is pressed:
#import "sonicfitViewController.h"
#implementation appViewController
#synthesize C3, Cs3, D3, Ds3, Db3, E3, Eb3, F3, Fs3, G3, Gs3, A4, Ab4, As4, B4, Bb4, C4;
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
NSString *path = [[NSBundle mainBundle] pathForResource:#"3C" ofType:#"mp3"];
NSLog(#"path: %#", path);
NSURL *file = [[NSURL alloc] initFileURLWithPath:path];
AVAudioPlayer *p = [[AVAudioPlayer alloc]
initWithContentsOfURL:file error:nil];
[file release];
self.player = p;
[p release];
[player prepareToPlay];
[player setDelegate:self];
[super viewDidLoad];
}
- (IBAction) playNote {
[self.player play];
}
Now, with the above I have two issues:
First, the NSLog reports NULL and crashes when trying to play the file. I have added the mp3's to the resources folder and they have been copied and not just linked. They are not in an subfolder under the resources folder.
Secondly, how can I set it up so that when say button C3 is pressed, it plays C3.mp3 and F3 plays F3.mp3 without writing duplicate lines of code for each different button? playNote should be like
NSString *path = [[NSBundle mainBundle] pathForResource:nameOfButton ofType:#"mp3"];
instead of defining it specifically (#"C3").
Is there a better way of doing this and why does the *path report NULL and crash when I load the app?
I'm pretty sure it's something as simple as adding additional variable inputs to - (IBAction) playNote:buttonName and putting all the code to call AVAudioPlayer in the playNote function but I'm unsure of the code to do this.
Performing multiple actions with same selector is a common task. Just set a tag property for each button and use a NSArray of NSStrings to store file names. Your even need not create each button separately. See code sample for similar question problem with selector in iphone? answer.
Check if your files is realy copied to bundle. For example in simulator
log your bundle directory with NSLog(#"myBundle:%#",[[NSBundle mainBundle] bundlePath]);
and look at files.
I have a method tied to four buttons. I want to create an array containing each button, and later retrieve and interact w/ a button from the array. The code I was tinkering with below. When I try to get a button from the array and send it a message, it goes kablooie.
Any thoughts on what I'm doing wrong?
Hack_DumpViewController.h
#import <UIKit/UIKit.h>
#interface Hack_DumpViewController : UIViewController {
IBOutlet UIButton *redButton;
IBOutlet UIButton *greenButton;
IBOutlet UIButton *blueButton;
IBOutlet UIButton *yellowButton;
NSArray *buttonMapping;
}
- (IBAction) changeToYo:(id)sender;
#property (nonatomic, retain) UIButton *redButton;
#property (nonatomic, retain) UIButton *greenButton;
#property (nonatomic, retain) UIButton *blueButton;
#property (nonatomic, retain) UIButton *yellowButton;
#property (nonatomic, retain) NSArray *buttonMapping;
#end
Hack_DumpViewController.m
#import "Hack_DumpViewController.h"
#implementation Hack_DumpViewController
#synthesize redButton;
#synthesize greenButton;
#synthesize yellowButton;
#synthesize blueButton;
#synthesize buttonMapping;
- (IBAction) changeToYo:(id)sender {
NSLog(#"changing numbers!");
for (UIButton *b in buttonMapping) {
[b setTitle:#"yo!"];
}
NSLog(#"changed to numbers!");
}
- (void)viewDidLoad {
buttonMapping = [[NSArray alloc] initWithObjects:greenButton, redButton, yellowButton, blueButton, nil];
}
[NSArray arrayWithObjects:...] returns an autoreleased array, so by the time you use it, it no longer exists and you end up messaging an invalid pointer. What you want is [[NSArray alloc] initWithObjects:...] (remembering to release it in your dealloc).
Why not tag the views in interface builder and then treat them like an array, much easier