NSString from other UIViewController is null - iphone

Could anyone please explain to me why this isn't working? I think it is a real simple problem, but for some reason I am not getting it.
My problem: I have a NSString in my firstViewController with value "Hello!". Now I want to display this value in my secondViewController but the output is null.
This is my NSLog
2013-03-09 foo[95381:c07] value of foo in BITfirstViewcontroller: Hello!
2013-03-09 foo[95381:c07] value of foo in BITsecondViewcontroller: (null)
BITAppDelegate.m
#import "BITAppDelegate.h"
#import "BITfirstViewController.h"
#implementation BITAppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
BITfirstViewController *fvc = [[BITfirstViewController alloc]init];
// Create navigationController and set InputViewController as root for navController
UINavigationController *navController = [[UINavigationController alloc]initWithRootViewController:fvc];
[self.window setRootViewController:navController];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
BITfirstViewController.h
#import <UIKit/UIKit.h>
#interface BITfirstViewController : UIViewController
#property (strong, nonatomic) NSString *foo;
-(IBAction)showSecondView:(id)sender;
#end
BITfirstViewController.m
#import "BITfirstViewController.h"
#import "BITsecondViewController.h"
#interface BITfirstViewController ()
#end
#implementation BITfirstViewController
#synthesize foo;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
foo = [NSString stringWithFormat:#"Hello!"];
NSLog(#"value of foo in BITfirstViewcontroller: %#",foo);
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self
action:#selector(showSecondView:)
forControlEvents:UIControlEventTouchDown];
[button setTitle:#"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[self.view addSubview:button];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(IBAction)showSecondView:(id)sender;
{
BITsecondViewController *svc = [[BITsecondViewController alloc]init];
[self.navigationController pushViewController:svc animated:YES];
}
#end
BITsecondViewController.h
#import <UIKit/UIKit.h>
#class BITfirstViewController;
#interface BITsecondViewController : UIViewController
#property (nonatomic, retain) BITfirstViewController *fvc;
#end
BITsecondViewController.m
#import "BITsecondViewController.h"
#import "BITfirstViewController.h"
#interface BITsecondViewController ()
#end
#implementation BITsecondViewController
#synthesize fvc;
- (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.
NSLog(#"value of foo in BITsecondViewcontroller: %#", fvc.foo);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end

Try this in BITfirstViewController.m
-(IBAction)showSecondView:(id)sender;
{
BITsecondViewController *svc = [[BITsecondViewController alloc]init];
svc.fvc = self; // you need to set this property as you prepare the svc
[self.navigationController pushViewController:svc animated:YES];
}
EDIT:
Your fvc and svc are encapsulated, and don't have direct knowledge about each-other except though the use of properties (at least that's the way we try to do things in OOP). So, you were correct in creating a #property in your svc that allowed you to have a handle to your fvc, but [[BITsecondViewController alloc]init] will simply initialize that pointer to nil. Then you need to set that property to point to the intended object, which in this case is the fvc. Since the svc is being build from inside an instance of BITFirstViewController, the correct handle to pass in is self.

Related

Using delegate between two viewcontrollers in iphone

I have two view controllers: view controller and viewcontroller2nd. I have UILabel in one of them and would like to change it when the button( named Go) in the viewcontroller2nd is clicked. I am using delegates and protocols to do it.
The code looks like this:
ViewController.h
#import <UIKit/UIKit.h>
#import "ViewController2nd.h"
#interface ViewController : UIViewController <SecondViewControllerDelegate>
{
IBOutlet UILabel *lbl;
ViewController2nd *secondview;
}
-(IBAction)passdata:(id)sender;
#end
ViewController.m
#import "ViewController.h"
#import "ViewController2nd.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void) changeLabel:(NSString*)str{
lbl.text = str;
}
-(IBAction)passdata:(id)sender{
ViewController2nd *second = [[ViewController2nd alloc] initWithNibName:nil bundle:nil];
[self presentViewController:second animated:YES completion:NULL];
}
#end
Viewcontroller2nd.h
#import <UIKit/UIKit.h>
#protocol SecondViewControllerDelegate <NSObject>
#optional
-(void) changeLabel:(NSString*)str;
#end
#interface ViewController2nd : UIViewController{
IBOutlet UIButton *bttn;
id <SecondViewControllerDelegate> delegate;
}
#property (retain) id delegate;
-(IBAction)bttnclicked;
-(IBAction)back:(id)sender;
#end
ViewController2nd.m
#import "ViewController2nd.h"
#import "ViewController.h"
#interface ViewController2nd ()
#end
#implementation ViewController2nd
#synthesize delegate;
- (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 from its nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(IBAction)bttnclicked{
[[self delegate] changeLabel:#"Hello"];
}
-(IBAction)back:(id)sender{
[self dismissViewControllerAnimated:YES completion:NULL];
}
#end
The passing of the control between the two views is working correctly. However, when i click the go button in the viewcontroller2nd, it doesn't change the value of the label to Hello. What is wrong with the code? Need some guidance.
It seems you never set the delegate.
You can do it in your passData method :
-(IBAction)passdata:(id)sender{
ViewController2nd *second = [[ViewController2nd alloc] initWithNibName:nil bundle:nil];
second.delegate = self;
[self presentViewController:second animated:YES completion:NULL];
}
Hm, try the following in your changeLabel delegate method:
-(void) changeLabel:(NSString*)str{
lbl.text = str;
[lbl setNeedsDisplay];
}
EDIT:
Other than that:
Your label is a IBOutlet, right? Did you connect the label in your xib with the IBOutlet property (i.e. lbl) correctly in interface builder with the files owner
If you want to do this by using delegates then change passdata like:
-(IBAction)passdata:(id)sender
{
ViewController2nd *second = [[ViewController2nd alloc] initWithNibName:nil bundle:nil];
[second setDelegate:self];
[self presentViewController:second animated:YES completion:NULL];
}
You can do this without delegates.
Just create a object of ViewController in secondView and synthesize it like:
#import "ViewController.h"
#interface ViewController2nd : UIViewController
{
IBOutlet UIButton *bttn;
ViewController *parent;
}
#property (nonatomic, assign) ViewController *parent;
-(IBAction)bttnclicked;
-(IBAction)back:(id)sender;
#end
and in the passdata change it like
-(IBAction)passdata:(id)sender
{
ViewController2nd *second = [[ViewController2nd alloc] initWithNibName:nil bundle:nil];
[second setParent:self];
[self presentViewController:second animated:YES completion:NULL];
}
and change the bttnclicked like:
-(IBAction)bttnclicked
{
[parent changeLabel:#"Hello"];
}
I wrote following for you!
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
#property (strong, nonatomic) IBOutlet UILabel *label;
#end
#import "ViewController.h"
#import "ViewController2.h"
#interface ViewController () <ViewController2Delegate>
#end
#implementation ViewController
-(void)passdata:(NSString *)data
{
self.label.text = data;
}
- (IBAction)buttonClicked:(id)sender {
ViewController2 *v = [[ViewController2 alloc] initWithNibName:#"ViewController2" bundle:nil];
v.delegate = self;
[self presentViewController:v animated:YES completion:nil];
}
#end
#import <UIKit/UIKit.h>
#protocol ViewController2Delegate <NSObject>
- (void)passdata:(NSString*)data;
#end
#interface ViewController2 : UIViewController
#property(assign, nonatomic) id<ViewController2Delegate> delegate;
#end
#import "ViewController2.h"
#interface ViewController2 ()
#end
#implementation ViewController2
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (IBAction)buttonClicked:(id)sender {
[self.delegate passdata:#"hello"];
}
- (IBAction)backButtonClicked:(id)sender {
[self dismissViewControllerAnimated:YES completion:nil];
}
#end
You don't need to import the header "ViewController2nd.h" in the both ViewController.h and ViewController.m
You declare the UILabel without property like, #property (strong, nonatomic).
May be, You didn't properly map the UILabel to your .storyboard or .xib file.
You forget to assign the second view controller delegate while calling the controller
ViewController2nd *second = [[ViewController2nd alloc] initWithNibName:nil bundle:nil];
second.delegate = self;
[self presentViewController:second animated:YES completion:NULL];
If anyone is using storyboard for viewcontrollers navigation.
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier hasPrefix:#"view_to_capture"]) {
ViewController2nd *destination = segue.destinationViewController;
destination.delegate = self;
}
}

How do I control the size and layout of child views?

I'm diving into iOS development and I'm trying to figure out how to control the size and layout of multiple child views (in this case, two child views). I posted this question in a different context and my question wasn't getting it answered, so I'm reposting it as a much simpler question. I'm attempting to add to children view and position them at (0, 0) and (100, 100) respectively, but the first view (master) I add ends up filling the whole screen. My code is very simple, what am I doing wrong that is preventing me from controlling the size and position of the two children views?
MySplitViewController.m
#import "MySplitViewController.h"
#import "MasterViewController.h"
#import "DetailViewController.h"
#interface MYSplitViewController (){}
#property (nonatomic, strong) MasterViewController *masterViewController;
#property (nonatomic, strong) DetailViewController *detailViewController;
#end
#implementation MySplitViewController
- (id)initWithCoder:(NSCoder *)aDecoder{
self = [super initWithCoder:aDecoder];
if (self) {
self.masterViewController = [[MasterViewController alloc] initWithNibName:nil bundle:nil];
self.detailViewController = [[DetailViewController alloc] initWithNibName:nil bundle:nil];
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.frame = CGRectMake(0, 0, 768, 1004);
[self.view addSubview:self.masterViewController.view];
[self.masterViewController viewDidLoad];
[self.view addSubview:self.detailViewController.view];
[self.detailViewController viewDidLoad];
}
#end
MasterViewController.m
#import "MasterViewController.h"
#interface MasterViewController ()
#end
#implementation MasterViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
UITableView *table = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 100, 1004) style:UITableViewStylePlain];
table.dataSource = self;
table.delegate = self;
[self.view addSubview:table];
}
#end
DetailViewController.m
#import "DetailViewController.h"
#interface DetailViewController ()
#end
#implementation DetailViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
UIView *uiview = [[UIView alloc] initWithFrame:CGRectMake(100, 0, 668, 1004)];
[self.view addSubview:uiview];
}
#end
Thanks so much in advance for your wisdom!
Try setting the frames for self.masterViewController.view and self.detailViewController.view before adding as subview to self.view.
For eg:-
self.masterViewController.view.frame = CGRectMake(0, 0, 100, 100);
self.detailViewController.view.frame = CGRectMake(100, 100, 200, 200);
And you are not supposed to call viewDidLoad method directly. It gets called automatically once the view is loaded on the screen.
You should create UIView derived class for your MySplitViewController view and implement layoutSubviews method

Why Isn't My Info Button Working?

My Info button is showing up when I run my app but it doesn't do anything, no response when I click it.
In my ProfileViewController file:
- (void)viewDidLoad
{
UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeInfoDark];
infoButton.frame = CGRectMake(290.0, 10.0, 15.0, 15.0);
[infoButton addTarget:self action:#selector(toggleCreditsOpen:)forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:infoButton];
[super viewDidLoad];
}
I also have the following two methods to load the about view (the screen that loads up when the button is clicked):
- (IBAction) toggleCreditsOpen:(id)inSender
{
UIViewController *theController = [[UIViewController alloc] initWithNibName:#"AboutViewController" bundle:nil];
[self.navigationController presentModalViewController:theController animated:TRUE];
}
- (IBAction) toggleCreditsClosed:(id)inSender
{
[self.navigationController dismissModalViewControllerAnimated:TRUE];
}
EDIT:
I am adding my full implementation file here:
#import "ProfileViewController.h"
#import "AboutViewController.h"
#implementation ProfileViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)dealloc
{
[super dealloc];
}
- (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.
}
- (IBAction)toggleCreditsOpen:(id)inSender
{
UIViewController *theController = [[UIViewController alloc] initWithNibName:#"AboutViewController" bundle:nil];
[self.navigationController presentModalViewController:theController animated:YES];
}
- (IBAction)toggleCreditsClosed:(id)inSender
{
[self.navigationController dismissModalViewControllerAnimated:TRUE];
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
UIButton *infoButton = [[UIButton buttonWithType:UIButtonTypeInfoDark] retain];
infoButton.frame = CGRectMake(290.0, 10.0, 15.0, 15.0);
//[infoButton addTarget:self action:#selector(toggleCreditsOpen:)forControlEvents:UIControlEventTouchUpInside];
[infoButton addTarget:self action:#selector(toggleCreditsOpen:)forControlEvents:UIControlEventTouchDown];
[self.view addSubview:infoButton];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#end
Using your provided code works for me, if self.navigationController is non-nil, and there exists an AboutViewController.xib in your main bundle. Otherwise, I don't see anything readily wrong.
If you don't have a navigation controller, the proper line in toggleCreditsOpen: would be:
[self presentModalViewController:theController animated:YES];
Edit:
If you want to dismiss the modal view later, its usually a good idea to do this with a delegate. Instead of
UIViewController *theController = [[UIViewController alloc] initWithWhatever];
you can do
AboutViewController *theController = [[AboutViewController alloc] initWithWhatever];
where AboutViewController has a delegate. Probably something like id<DismissModalProtocol> delegate;. Then, your view controller would implement this #protocol, and before it calls presentModalViewController:animated:, it'll set itself as the delegate. So very roughly, it would look something like this:
// AboutViewController.h
#protocol DismissModalProtocol;
#interface AboutViewController : UIViewController {
id<DismissModalProtocol> delegate;
}
#property id<DismissModalProtocol> delegate;
#end
#protocol DismissModalProtocol <NSObject>
- (void)dismissController:(UIViewController *)viewController;
#end
// ProfileViewController.h
#import "AboutViewController.h"
#interface ProfileViewController : UIViewController <DismissModalProtocol>
#end
// ProfileViewController.m
#implementation ProfileViewController
- (void)dismissController:(UIViewController *)viewController {
[self dismissModalViewControllerAnimated:YES];
}
- (void)toggleCreditsOpen:(id)sender {
AboutViewController *controller = [[AboutViewController alloc] init];
controller.delegate = self;
[self presentModalViewController:controller animated:YES];
}
#end
I don't know at all why this isn't working, but if I were to take a guess, I'd say it's in the [self.navigationController presentModalViewController:theController animated:TRUE];
statement. From what I know, it should be:
[self.navigationController presentModalViewController:theController animated:YES];
See if it works after you do that. I'm not sure, but that could be the problem with your code.
hi
you are took a mistake to define your button..
just assign retain property at the end of button
like
UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeInfoDark] retain];
and also give
[infoButton addTarget:self action:#selector(toggleCreditsOpen:)forControlEvents:UIControlEventTouchDown];

Adding a 3rd button and have date picker for time

NEW CODE
DatePickerViewController.h
#import <UIKit/UIKit.h>
#protocol DatePickerViewControllerDelegate;
#interface DatePickerViewController : UIViewController {
IBOutlet UIDatePicker *datePicker;
id<DatePickerViewControllerDelegate> delegate;
}
#property (retain) IBOutlet UIDatePicker *datePicker;
#property (assign) id<DatePickerViewControllerDelegate> delegate;
NSInteger buttonPressed;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil;
- (IBAction)doneButtonPressed:(id)sender;
#end
#protocol DatePickerViewControllerDelegate <NSObject>
#optional
-(void)datePickerViewController:(DatePickerViewController *)controller didChooseDate:(NSString *)chosenDate;
#end
DatePickerViewController.m
#import "DatePickerViewController.h"
#implementation DatePickerViewController
#synthesize datePicker, delegate;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
// Custom initialization
self.title = #"Date Picker";
}
return self;
}
- (void)viewDidLoad {
NSLog(#"Date Picker. viewDidLoad");
[super viewDidLoad];
double days = 2.0f;
datePicker.date = [NSDate dateWithTimeIntervalSinceNow:60.0f * 60.0f * 24.0f * days];
}
//-(void)datePickerViewController:(DatePickerViewController *)controller didChooseDate:(NSString *)chosenDate;
- (IBAction)doneButtonPressed:(id)sender
{
if ([self.delegate respondsToSelector:#selector(datePickerViewController:didChooseDate:)]) {
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
NSString *dateString = [dateFormatter stringFromDate:[datePicker date]];
[self.delegate datePickerViewController:self didChooseDate:dateString];
[self dismissModalViewControllerAnimated:YES];
}
}
- (void)dealloc {
[datePicker release];
[super dealloc];
}
#end
DatePickerViewController2.h
#import <UIKit/UIKit.h>
#protocol DatePickerViewController2Delegate;
#interface DatePickerViewController2 : UIViewController {
IBOutlet UIDatePicker *datePicker2;
id<DatePickerViewController2Delegate> delegate;
}
#property (retain) IBOutlet UIDatePicker *datePicker2;
#property (assign) id<DatePickerViewController2Delegate> delegate;
NSInteger buttonPressed2;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil;
- (IBAction)doneButtonPressed2:(id)sender;
#end
#protocol DatePickerViewController2Delegate <NSObject>
#optional
-(void)datePickerViewController2:(DatePickerViewController2 *)controller didChooseDate:(NSString *)chosenDate;
#end
DatePickerViewController2.m
#import "DatePickerViewController2.h"
#implementation DatePickerViewController2
#synthesize datePicker2, delegate;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
// Custom initialization
self.title = #"Date Picker2";
}
return self;
}
- (void)viewDidLoad {
NSLog(#"Date Picker2. viewDidLoad");
[super viewDidLoad];
double days = 2.0f;
datePicker2.date = [NSDate dateWithTimeIntervalSinceNow:60.0f * 60.0f * 24.0f * days];
}
//-(void)datePickerViewController:(DatePickerViewController *)controller didChooseDate:(NSString *)chosenDate;
- (IBAction)doneButtonPressed2:(id)sender
{
if ([self.delegate respondsToSelector:#selector(datePickerViewController2:didChooseDate:)]) {
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
NSString *dateString = [dateFormatter stringFromDate:[datePicker2 date]];
[self.delegate datePickerViewController2:self didChooseDate:dateString];
[self dismissModalViewControllerAnimated:YES];
}
}
- (void)dealloc {
[datePicker2 release];
[super dealloc];
}
#end
DatePickerModalExampleAppDelegate.h
#import <UIKit/UIKit.h>
#class DatePickerModalExampleViewController;
#interface DatePickerModalExampleAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
DatePickerModalExampleViewController *viewController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet DatePickerModalExampleViewController *viewController;
#end
DatePickerModalExampleAppDelegate.m
#import "DatePickerModalExampleAppDelegate.h"
#import "DatePickerModalExampleViewController.h"
#implementation DatePickerModalExampleAppDelegate
#synthesize window;
#synthesize viewController;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Override point for customization after app launch
[window addSubview:viewController.view];
[window makeKeyAndVisible];
}
- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
}
#end
DatePickerModalExampleViewController.h
#import <UIKit/UIKit.h>
#import "DatePickerViewController.h"
#import "DatePickerViewController2.h"
#interface DatePickerModalExampleViewController : UIViewController <DatePickerViewControllerDelegate> {
IBOutlet UIButton *button;
IBOutlet UIButton *button2;
IBOutlet UIButton *button3;
}
#property(nonatomic, retain) IBOutlet UIButton *button;
#property(nonatomic, retain) IBOutlet UIButton *button2;
#property(nonatomic, retain) IBOutlet UIButton *button3;
-(IBAction)buttonPressed:(id)sender;
-(IBAction)buttonPressed2:(id)sender;
#end
DatePickerModalExampleViewController.m
#import "DatePickerModalExampleViewController.h"
#implementation DatePickerModalExampleViewController
#synthesize button;
#synthesize button2;
#synthesize button3;
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
// Custom initialization
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/
-(IBAction)buttonPressed:(id)sender{
NSLog(#"I was pressed");
buttonPressed = ((UIButton *)sender).tag;
DatePickerViewController *datePickerViewController = [[DatePickerViewController alloc] initWithNibName:#"DatePickerViewController" bundle:nil];
datePickerViewController.delegate = self;
[self presentModalViewController:datePickerViewController animated:YES];
[datePickerViewController release];
switch (((UIButton*)sender).tag)
{
case 100001:
NSLog(#"Button 1 was pressed");
//some code
break;
case 100002:
NSLog(#"Button 2 was pressed");
//some code
break;
}
}
-(IBAction)buttonPressed2:(id)sender{
NSLog(#"I was pressed2");
buttonPressed2 = ((UIButton *)sender).tag;
DatePickerViewController2 *datePickerViewController2 = [[DatePickerViewController2 alloc] initWithNibName:#"DatePickerViewController2" bundle:nil];
datePickerViewController2.delegate = self;
[self presentModalViewController:datePickerViewController2 animated:YES];
[datePickerViewController2 release];
switch (((UIButton*)sender).tag)
{
case 100003:
NSLog(#"Button 3 was pressed");
//some code
break;
}
}
-(void)viewDidLoad{
[super viewDidLoad];
self.button.tag = 100001;
self.button2.tag = 100002;
self.button3.tag = 100003;
buttonPressed = -1;
buttonPressed2 = -1;
}
-(void)datePickerViewController:(DatePickerViewController *)controller didChooseDate:(NSString *)chosenDate{
NSLog(#"Chosen Date as String: %#", chosenDate );
if (buttonPressed == -1)
return;
UIButton *buttonToSet = (UIButton*)[self.view viewWithTag:buttonPressed];
buttonPressed = -1;
[buttonToSet setTitle: chosenDate forState: UIControlStateNormal];
[self dismissModalViewControllerAnimated:YES];
}
-(void)datePickerViewController2:(DatePickerViewController2 *)controller didChooseDate:(NSString *)chosenDate{
NSLog(#"Chosen Date as String: %#", chosenDate );
if (buttonPressed2 == -1)
return;
UIButton *buttonToSet = (UIButton*)[self.view viewWithTag:buttonPressed2];
buttonPressed2 = -1;
[buttonToSet setTitle: chosenDate forState: UIControlStateNormal];
[self dismissModalViewControllerAnimated:YES];
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (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 {
[button3 release];
[button2 release];
[button release];
[super dealloc];
}
#end
Hello you can set the property "tag" on button to identify it
Uncomment
- (void)viewDidLoad {
[super viewDidLoad];
}
And type :
- (void)viewDidLoad {
[super viewDidLoad];
self.button.tag = 100001;
self.button2.tag = 100002;
}
then
turn in DatePickerModalExampleViewController.h
(IBAction)buttonPressed to (IBAction)buttonPressed:(id)sender;
Then turn in DatePickerModalExampleViewController.m
-(IBAction)buttonPressed to -(IBAction)buttonPressed:(id)sender
and in DatePickerModalExampleViewController.m this method could be like that :
-(IBAction)buttonPressed:(id)sender
{
switch(((UIButton*)sender).tag)
{
case 100001
NSLog(#"Button 1 was pressed");
DatePickerViewController *datePickerViewController =[DatePickerViewController alloc] initWithNibName:#"DatePickerViewController" bundle:nil];
datePickerViewController.delegate = self;
[self presentModalViewController:datePickerViewController animated:YES];
[datePickerViewController release];
break;
case 100002 :
NSLog(#"Button 2 was pressed");
// some code
break;
}
}
As you use the interfacebuilder I'm not friend with it but you must relink your actions
I'm writting from my PC so without xcode some code can contains syntax error be carreful. but it's the main idea.
Use tag for both buttons and check the condition accordingly...

How to implement a modal date picker?

I am using code from Ed Marty's answer for the question here but am having real trouble with a few bits.
On the click of a button I have got the datepicker appearing, but the 'done' button however isn't. I am also getting an error from the line:
[delegate datePickerController:controller didPickDate:datePicker.date];
Error message:
'controller' undeclared (first use in this function)
All in all I have 6 files:
ModalDatePickerViewController.m
ModalDatePickerViewController.h
ModalDatePickerAppDelegate.m
ModalDatePickerAppDelegate.h
DatePickerController.m
DatePickerController.h
My DatePickerController.h is looking like:
#import <UIKit/UIKit.h>
#class DatePickerController;
#protocol DatePickerControllerDelegate
- (void) datePickerController:(DatePickerController *)controller didPickDate:(NSDate *)date;
#end
#interface DatePickerController : UIViewController {
UIDatePicker *datePicker;
NSObject <DatePickerControllerDelegate> *delegate;
}
#property (nonatomic, retain) UIDatePicker *datePicker;
#property (nonatomic, assign) NSObject <DatePickerControllerDelegate> *delegate;
#end
and the DatePickerController.m:
#import "DatePickerController.h"
#implementation DatePickerController
#synthesize datePicker;
#synthesize delegate;
- (void) loadView {
self.view = [[[UIView alloc] init] autorelease];
self.datePicker = [[[UIDatePicker alloc] init] autorelease];
[self.view addSubview:self.datePicker];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:#"Done" forState:UIControlStateNormal];
button.center = CGPointMake(160,230);
[button addTarget:self action:#selector(done) forControlEvents:(UIControlEventTouchUpInside)];
[self.view addSubview:button];
}
- (void) done {
[delegate datePickerController:controller didPickDate:datePicker.date];
}
- (void) dealloc {
[datePicker release];
[super dealloc];
}
#end
On the main view I have a button that call this class as below:
#import "ModalDatePickerViewController.h"
#implementation ModalDatePickerViewController
- (void) pickDate {
DatePickerController *screen = [[[DatePickerController alloc] init] autorelease];
screen.delegate = self;
[self presentModalViewController:screen animated:YES];
}
- (void) datePickerController:(DatePickerController *)controller didPickDate:(NSDate *)date {
//[self doSomethingWithDate:date];
[controller dismissModalViewControllerAnimated:YES];
}
- (IBAction)HitMe:(id)sender {
[self pickDate];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (void)viewDidUnload {
}
- (void)dealloc {
[super dealloc];
}
#end
and:
#import <UIKit/UIKit.h>
#import "DatePickerController.h"
#interface ModalDatePickerViewController : UIViewController <DatePickerControllerDelegate> {
}
- (IBAction)HitMe:(id)sender;
#end
On this line:
[delegate datePickerController:controller didPickDate:datePicker.date];
try replacing controller with self.