I have got this error on the line where the void is it says undeclared identifier for sliderDidChange can some one please help me with this i can;t find any answers.
h. file
//
// LightViewController.h
// Flash Light
//
// Created by John Whitney on 12-07-27.
// Copyright (c) 2012 Perfect Programs. All rights reserved.
//
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#interface LightViewController : UIViewController {
IBOutlet UISlider *slider;
IBOutlet UISlider *theslider;
IBOutlet UISlider *customslider;
UIButton *onButton;
UIButton *offButton;
UIImageView *onView;
UIImageView *offView;
}
#property(nonatomic, strong) IBOutlet UIButton *onButton;
#property(nonatomic, strong) IBOutlet UIButton *offButton;
#property(nonatomic, strong) IBOutlet UIImageView *onView;
#property(nonatomic, strong) IBOutlet UIImageView *offView;
#property(nonatomic, readonly) float torchLevel;
-(void)sliderDidChange:(UISlider *)slider;
-(BOOL)setTorchModeOnWithLevel:(float)torchLevel error:(NSError **)outError;
-(BOOL)supportsAVCaptureSessionPreset:(NSString *)preset;
-(IBAction)torchOn:(id)sender;
-(IBAction)torchOff:(id)sender;
#end
m.file
UISlider *localslider = [[UISlider alloc] initWithFrame:CGRectMake(20.0f, 20.0f, 280.0f, 40.0f)];
localslider.maximumValue = 1.0f;
localslider.minimumValue = 0.0f;
[localslider setContinuous:YES];
[localslider addTarget:self action:#selector(sliderDidChange:) forControlEvents:UIControlEventValueChanged];
[self.view addSubview:localslider];
-(void)sliderDidChange:(UISlider *)slider
{
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
[device lockForConfiguration:nil];
[device setTorchModeOnWithLevel:slider.value error:NULL];
[device unlockForConfiguration];
}
can someone please help quick
Well the problem may be you added an { anywhere above that line of code
Please make sure all open braces are closed properly
I assume 1) you have synthesized your properties in the .m file, 2) you have implemented all methods declared in the .h file also there, and 3) the 6 statements in your .m file with which you create your localslider object, i.e. those followed by -(void)sliderDidChange:(UISlider *)slider, are part of the viewDidLoad method.
In this case, you should only get a warning that the argument slider of your -(void)sliderDidChange:(UISlider *)slider method hides your instance variable with the same name in this method.
Related
I cannot create any IBOutlets. I'm using a tableviewcontroller instead of a viewcontroller.
When I click on TableViewController, the class is UITableViewController and I can't change that.
Here's my code for ViewController.h:
// ViewController.h
// Tips4
//
// Created by Meghan on 1/20/14.
// Copyright (c) 2014 Meghan. All rights reserved.
//
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
#property (strong, nonatomic) IBOutlet UILabel *sliderDisplay;
#property (strong, nonatomic) IBOutlet UITextField *tempText;
#property (strong, nonatomic) IBOutlet UILabel *billTotal;
#property (nonatomic, strong) IBOutlet UISlider *slider;
- (IBAction)sliderValueChanged:(id)sender;
#property (nonatomic) float answer;
#property (nonatomic) float answerTwo;
#end
Here's my ViewController.m:
// ViewController.m
// Tips4
//
// Created by Meghan on 1/20/14.
// Copyright (c) 2014 Meghan. All rights reserved.
//
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 10;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *tipsTableIdentifier = #"TipsTableCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:tipsTableIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:tipsTableIdentifier];
}
return cell;
}
- (IBAction)sliderValueChanged:(id)sender
{
float theText = [_tempText.text floatValue];
_answer = (_slider.value * theText) / 100;
_answerTwo = _answer + theText;
_sliderDisplay.text = [NSString stringWithFormat:#"%1.2f", _answer];
_billTotal.text = [NSString stringWithFormat:#"%1.2f", _answerTwo];
}
- (void)viewDidLoad
{
[super viewDidLoad];
_tempText.keyboardType = UIKeyboardTypeDecimalPad;
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
If you’re using a TableViewController, your class must inherit from a UITableViewController. Thats when it will show up in the Identity Inspector, which is where you change your class from UIViewController to your class. After that you should be able to connect IBOutlets.
To do that, just replace your current line
#interface ViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
with
#interface ViewController : UITableViewController
Now, you will need to add the init method that calls the super, to the .m file.
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
I hope this will do it.
Also, sometimes, changes in the code don’t show up in the storyboard Identity Inspector. In that case, you can just quit the Xcode window and open the project again. That does it.
Alternatively, if you use a ViewController, your class can inherit from a UIViewController. Then you add a TableView to your View and add a UITableView instance to the controller file (create an IBOutlet). In this case, your .h file needs to add the UITableViewDelegate and UITableViewDataSource to populate the table and your .m file needs to implement the required methods (Xcode will warn you about this).
I made some example that changes view by clicking button.
When clicking the "fist" button in view, I keep getting the error:
[__NSArrayM changeLogView:]: unrecognized selector sent to instance 0x100539e30
Here is the simplified code:
DSWAppDelegate.h
#import <Cocoa/Cocoa.h>
#class DSWHomeViewController;
#interface DSWAppDelegate : NSObject <NSApplicationDelegate>
#property (assign) IBOutlet NSWindow *window;
#property (weak) IBOutlet NSButton *logBtn;
#property (weak) IBOutlet NSTabView *tabView;
#end
DSWAppDelegate.m
#import "DSWAppDelegate.h"
#import "DSWLogViewController.h"
#implementation DSWAppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
// Insert code here to initialize your application
[self.tabView setTabViewType:NSNoTabsNoBorder];
NSTabViewItem *item = nil;
DSWLogViewController *logvc = [[DSWLogViewController alloc initWithNibName:#"DSWLogViewController" bundle:[NSBundle mainBundle]];
item = [[NSTabViewItem alloc] initWithIdentifier:#"log"];
[item setView:logvc.view];
[self.tabView insertTabViewItem:item atIndex:0];
}
#end
DSWLogViewController.h
#import <Cocoa/Cocoa.h>
#interface DSWLogViewController : NSViewController
#property (weak) IBOutlet NSButton *firstBtn;
#property (weak) IBOutlet NSButton *secondBtn;
#property (weak) IBOutlet NSBox *box;
- (IBAction)changeLogView:(id)sender;
- (IBAction)testSelector:(id)sender;
#end
DSWLogViewController.m
#import "DSWLogViewController.h"
#implementation DSWLogViewController
- (IBAction)changeLogView:(id)sender
{
NSLog(#"changeLogView : %#", sender);
}
- (IBAction)testSelector:(id)sender
{
NSLog(#"testSelector : %#", sender);
}
#end
And I checked class name of file owner.
Something is sending a changeLogView: message to a mutable array instead of your view controller. Chances are, whatever you've connected the IBAction to is pointing to the wrong object - an array of some sort, rather than your view controller.
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 new to storyboarding so the answer to this may be simplistic,
I've created a viewController in which a UITextField is present. My test is to transfer the data (text) from that text field into a viewController that is pushed onto the screen.
The coding that i have is as follows:
ViewController1.h -
#import <UIKit/UIKit.h>
#import "ViewController2.h"
#interface ViewController1 : UIViewController
#property (nonatomic, retain) IBOutlet UITextField *inputText;
#end
ViewController1.m
#import "ViewController1.h"
#implementation ViewController
#synthesize inputText;
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([[segue identifier] isEqualToString:#"showTextController"]) {
ViewController2 *vc2 = [segue destinationViewController];
vc2.selectedText.text = self.inputText.text;
}
}
#end
ViewController2.h -
#import <UIKit/UIKit.h>
#interface ViewController2 : UIViewController
#property (nonatomic, retain) IBOutlet UILabel *selectedText;
#end
ViewController2.m
#import "ViewController2.h"
#implementation ViewController2
#synthesize selectedText;
#end
The segue between viewController1 and 2 in storyboard is referred to as 'showTextController'.
Is this the correct coding for something so simple? Do i need to be using 'ViewDidLoad' method along with the prepareForSegue:sender method?
It looks correct to me. In fact, this is simpler than we have had in the past since the storyboard takes care instantiating our view controller objects. One thing to note is that if you're using ARC then you shouldn't be retaining your UILabel.
Hope this helps.
I have two UINavigationController in the appdelegate.h
{
UINavigationController *leftView;
UINavigationController *rightView;
UIWindow *window;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet UINavigationController *leftView;
#property (nonatomic, retain) IBOutlet UINavigationController *rightView;
appdelegate.m
#synthesize leftView;
#synthesize rightView;
then in a different class
test.m
#import "appdelegate.h"
if I do:
[self leftView] pushViewController...; //(Everything is ok)
but if I change it to:
[self rightView] pushViewControll...; //it complains about ViewController may not respond to -rightView
You code seems right; what doesn't seem right is that you're including AppDelegate. If the code was in AppDelegate.m, it would probably work without any complaints by the compiler.
Instead, you've defined #property lines for each, but that is in AppDelegate.h, not test.h - but you're using them in test.m. That is probably the source of the problem.
Interestingly, does the code actually run?
I'm going to hazard a guess: Have you declared and synthesized a property for rightView, or at least provided your own manual getter?
It sounds like you declared a #property or method called leftView that returns the leftView ivar, but you forgot to do the same for rightView. The error is telling you that self doesn't respond to the selector rightView.