I have currently got a UITableView in my main view controller. I want the data of the selected row to be passed to another view controller in my project.
Here's what I have got so far, although there is an error. Why is this? I have referenced the class and the header file in my .h file.
I would really appreciate some help with this as I've tried everything I can think of.
Simply synthesize the object in the destination view.
It will work fine...
like:
in .h
#property(nonatomic, retain) UILabel *note;
in .m
#synthesize note;
Very Simple,I think note is a UILabel,
according to You error
please use this code in AddNote. h file
NSString *noteStr; //Ios 4
IBoutlet UILabel *note;
#property(nonatomic, retain) NSString *noteStr; //Ios 4
#property(nonatomic, retain) UILabel *note;
#property(nonatomic, strong) NSString *noteStr;
#property(nonatomic, strong) UILabel *note; //Ios 5
In AddNote. .m file
#synthesize note,noteStr;
self.note.text=noteStr; //in ViewWillAppear
Some Time Application is crash Because Memory IF you Work In Ios 4 Please Correct this code
an.noteStr - [selectNote retain];
Declare static variable for global use.
Using keyword extern
Create Common.h
extern NSMutableArray *gMyBasketCollectionList;
common.m
NSMutableArray *gMyBasketCollectionList;
Use This Mutable Aarray to Store Your Data and Display in Any other
include common.h in First View And SecondView
Add Object to mutable Array in First View And
Show SecondView And Display access that Array
Related
I've a problem with some label. I made a public method that takes information from a table view and shows this info in 3 label, a text view and it load a pic from the web. I setup all the variable in the table view didSelectRowAtIndexPath method, but I'm having some issue to display that info. I made so:
in the table view controller I called the other method so:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
self.detailCharacterViewController = [[DetailCharacterViewController alloc] init];
[self.detailCharacterViewController setupDetailViewControllerWithName:[self.arrayCharacters[indexPath.row] objectForKey:#"name"] andSurname:[self.arrayCharacters[indexPath.row] objectForKey:#"surname"] andKind:[self.arrayCharacters[indexPath.row] objectForKey:#"kind"] andDescription:[self.arrayCharacters[indexPath.row] objectForKey:#"description"] andImage:[self.arrayCharacters[indexPath.row] objectForKey:#"URLpic"]];
}
and I implemented the method so:
- (void)setupDetailViewControllerWithName:(NSString*)name andSurname:(NSString *)surname andKind:(NSString*) kind andDescription:(NSString*)description andImage:(NSString*)url {
NSLog(#"name = %#", name);
self.labelName.text = name;
self.labelSurname.text = surname;
self.labelKind.text = kind;
self.textDescription.text = description;
NSURL *urlPic = [NSURL URLWithString:url];
NSData *dataPic = [NSData dataWithContentsOfURL:urlPic];
[self.imagePic setImage:[UIImage imageWithData:dataPic]];
}
If I look to the log i see the right things, but if I look to the GUI on iPhone or iPhone simulator it will remain blank. What's wrong with this code?
Thank you for the suggestion.
#Alex Blundell
#import <UIKit/UIKit.h>
#interface DetailCharacterViewController : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *labelName;
#property (weak, nonatomic) IBOutlet UILabel *labelSurname;
#property (weak, nonatomic) IBOutlet UILabel *labelKind;
#property (weak, nonatomic) IBOutlet UIImageView *imagePic;
#property (weak, nonatomic) IBOutlet UITextView *textDescription;
- (void)setupDetailViewControllerWithName:(NSString*)name andSurname:(NSString *)surname andKind:(NSString*) kind andDescription:(NSString*)description andImage:(NSString*)url;
#end
The problem is that your DetailCharacterViewController's view is not loaded yet when you call setupDetailViewControllerWithName:..., so none of the outlets are connected (yet). Instantiating a view controller via alloc-init does not load its view automatically.
You could force loading the view by calling [self view] at the beginning of your setup method. This works because accessing the view property will automatically load the view if it wasn't loaded before.
Alternatively, you could make the name, surname, etc. NSString properties of the view controller and set the corresponding labels in viewDidLoad.
Are you using Interface Builder/Storyboards to design your interface? Have you made sure to connect the IBOutlets for each UITextField/View?
You should identify the objects in the header file on your view controller class, and ensure they're prefixed by IBOutlet for them to appear in Interface Builders connections pane. E.g.
IBOutlet UITextField labelName;
[...]
Then you need to go to IB and go to the connections pane for the view controller to connect each text field/view.
This problem happened to me as well.
It has to do with the fact that iOS actually hooks up your outlets really really late.
If you put a breakpoint in your setupDetailViewControllerWithName: and check your IBOutlet variables, they will be nil. That's why you are seeing a blank view. (The good old nil erroring)
The work-around I will do is to declare properties in the DetailCharacterViewController class. (Such as #property (copy, nonatomic) NSString* name).
And in the place where you are calling setupDetailViewControllerWithName:, set those properties instead such as:
self.detailCharacterViewController.name = name;
Finally in your DetailCharacterViewController's viewDidLoad:, you set the values of the labels using the saved properties. (The outlets are for sure hooked up then).
(By the way, this problem exists for prepareForSegue: as well. The destination view controller's outlets are all still nil in prepareForSegue:. So you cannot set them directly there yet)
I'm working on a project for iOS5 using ARC and storyboard.
I have a mapview with annotations with a disclosure button going to my DetailView (which is a TableViewController) but when it's supposed to be loaded, I get the following error:
2012-07-18 14:09:43.328 Zone-It-new[1966:707] Loadded the view for MapViewController
2012-07-18 14:11:40.467 Zone-It-new[1966:707] -[UILabel copyWithZone:]: unrecognized selector sent to instance 0x138470
2012-07-18 14:11:40.470 Zone-It-new[1966:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UILabel copyWithZone:]: unrecognized selector sent to instance 0x138470'
*** First throw call stack:
(0x3748488f 0x35189259 0x37487a9b 0x37486915 0x373e1650 0x311997ef 0x31195059 0x31194711 0x3119466b 0x311945e7 0x31284f63 0x311979bb 0x311973ad 0x31191b8b 0x311917d5 0x9386d 0x3120a93d 0x31284627 0x37cf5933 0x37458a33 0x37458699 0x3745726f 0x373da4a5 0x373da36d 0x33b99439 0x31186cd5 0x924b3 0x92458)
terminate called throwing an exception(lldb)
This is my detailviewcontroller.h:
#import <UIKit/UIKit.h>
#import "Event.h"
#interface DetailViewController : UITableViewController <UITableViewDelegate, UITableViewDataSource>{
IBOutlet UILabel *title;
IBOutlet UILabel *description;
IBOutlet UILabel *zone;
IBOutlet UILabel *gemeente;
IBOutlet UILabel *plaats;
IBOutlet UILabel *deelnemers;
IBOutlet UILabel *start;
IBOutlet UILabel *einde;
IBOutlet UILabel *id_nr;
}
#property (nonatomic) Event *event;
#property (nonatomic) IBOutlet UILabel *title, *zone, *description, *gemeente, *deelnemers, *start, *einde, *plaats, *id_nr;
#end
part of the DetailViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[[self navigationController] setNavigationBarHidden:NO animated:YES];
/*title.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin;*/
[title lineBreakMode];
[title setText:[event title]];
[title sizeToFit];
gemeente.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin;
[title lineBreakMode];
[gemeente setText:[event gemeente]];
}
And this is where the view gets created in via the ListView:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
DetailViewController *detail = [self.storyboard instantiateViewControllerWithIdentifier:#"detail"];
SingletonManager *sharedManager = [SingletonManager sharedManager];
[detail setEvent:[sharedManager.eventsManager objectAtIndex:indexPath.row]];
[self.navigationController pushViewController:detail animated:YES];
}
Event.h
#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>
#interface Event : NSObject <MKAnnotation>
// required property from mkanotation
#property (nonatomic) CLLocationCoordinate2D coordinate;
// Optional
#property (nonatomic, copy) NSString *title;
#property (nonatomic, copy) NSString *description;
#property (nonatomic, copy) NSString *zone;
#property (nonatomic, assign) NSString *gemeente;
#property (nonatomic, copy) NSString *straat;
#property (nonatomic, assign) int deelnemers;
#property (nonatomic, copy) NSDate *start;
#property (nonatomic, copy) NSDate *einde;
#property (nonatomic, copy) NSString *plaats;
#property (nonatomic, readonly) int id_nr;
#property (nonatomic, assign) int huisnummer;
#end
----- Some more debugging information -------
While using the exception breakpoints it stopped here:
[self.navigationController pushViewController:detail animated:YES];
console:
2012-07-18 15:53:46.691 Zone-It-new[179:707] Loadded the view for MapViewController
2012-07-18 15:54:01.940 Zone-It-new[179:707] -[UILabel copyWithZone:]: unrecognized selector sent to instance 0x170bb0
(lldb)
It appears that somewhere in your code you're trying to copy a UILabel. UIView subclasses don't adhere to the NSCopying protocol, so trying to copy any UIView will result in an exception (unless it's a subclass that does implements the protocol). I'd search through your code base to check where the copy is occurring. If you can't find any place that explicitly copies the UILabel, check collection classes. Some collections classes will copy values in (NSDictionary does this with keys, so if you're trying to use a UILabel as a key for a NSDictionary, you'll get the error). Also check your properties. What you show in your displayed code is fine, but if you specify a copy in a protocol for a UILabel, that'll also give the error.
You should also try standard debugging techniques like setting a breakpoint for all exceptions. (go to the breakpoints nav pane, at the bottom click the plus sign). This should help you find the problem by breaking on your offending line of code. Just be aware that if the copying is occurring in Apple's code (like setting a NSDictionary key) the breakpoint might not break on your code.
Update
Given your new code, I would suggest trying the following:
Try to find any place in your code where "anything" is copied. Obviously your not explicitly copying UILabel but maybe you're accidentally copying it by passing the wrong argument somewhere. For example: Remove all copy keywords from your Event properties and test it again. You probably don't need to specify copy for NSString anyway, but what we're doing here is making sure you're not accidentally setting a UILabel to one of those properties. If the code doesn't break, you didn't fix it but now you know what the problem is (trying to assign a UILabel to the wrong property).
Start commenting out various blocks of code, one at a time, to find the problem. For example, comment out your entire viewDidLoad method and test your code. If it works, you know the problem is in there. So uncomment part of the method and test again. Keep repeating until you've narrowed down the problem. If it still breaks with viewDidLoad, uncomment that and try a different block of code. In essence, you're playing detective to try to find the offending line of code.
The fix for this is to rename the title property in the UIViewController. This is due to the fact that UIViewController already defines an NSString * property with a name of title.
This can often mean you're trying to assign an object to a method that can't handle it, rather than a property of that object. For example, trying to set a UILabel to an object rather than a string property on that object.
My guess is it's this line: [gemeente setText:[event gemeente]];
There could also be an issue here:
#property (nonatomic) Event *event;
You haven't set Event *event as an instance variable but are referencing it as one. Try self.event for accessing event as you have it above.
I'm making an app that behaves something like the default Messages.app in iPhone where a user composes a text message in a UITextField and upon tapping the Send button, the value of the UITextField in ComposeViewController will be transferred to the table cell's UILabel in a custom cell in MasterViewController and also to the DetailViewController where another UILabel will get the text value from the UITextField. The DetailViewController is the ViewController loaded when the user taps the cells from the UITableViewCells.
I actually read related articles below but it doesn't work on my end.
How to send the text from textfield to another class?
How to see text from one text field in another text field?
How to send text field value to another class
Can you please guide me on how to properly implement this? I know it's easy. I just don't know why it's not working. ComposeVC is a ModalViewController while DetailVC is the view that loads when the user taps the cell in the MasterVC's table.
Thanks a lot!
Below is my code for ComposeVC.h:
UITextField *messageTextField;
#property (nonatomic, retain) IBOutlet UITextField *messageTextField;
- (IBAction)buttonPressed:(id)sender;
for ComposeVC.m
synthesize messageTextField;
-(IBAction)buttonPressed:(id)sender
{
DetailVC *detailVC = [[DetailVC alloc] init];
detailVC.messageText = messageTextField.text;
}
for DetailVC.h
NSString *messageText;
#property (nonatomic, copy) NSString *messageText;
for DetailVC.m
#synthesize messageText;
- (void)viewLoad
{
testLabel.text = messageText;
}
testLabel is the UILabel inside my DetailVC.
You can simply create property on another viewController. Suppose your textField is on view1 and you want to send it on view2 then:
in view 2
.h file
#interface view2:UIViewController {
NSString *str;
}
#property (nonatomic, retain) NSString *str;
in .m file
#synthesize str;
Now you can send your text from view1 to view 2 like:
objView2.str = txtField.text;
For viewing one textfield's text in another use
secondTextField.text = firstTextField.text;
Hope this helped let me know if you are looking for something different.
take one variable in the app delegate like in appdelegate.h
#interface appdelegate
{
NSString *str1;
}
#property (nonatomic, retain) NSString *str;
In .m file synthesize it.
set the text after editing the textfield(app del.str=textfield.text i.e setting value).And use the same wherever you want.
NSString *str = appdel.str(getting value);
Try this one:
#interface SecondView:UIViewController
{
NSString *stringSecond;
}
#property(nonatomic, retain) NSString *str;
In First View u have to create an reference like this:
#import "SecondView.h"
SecondView *detailViewController = [[SecondView alloc] initWithNibName:#"SecondView" bundle:nil];
detailViewController.stringSecond = #"Some string";
I am trying to add a record to the database using core data. The appDelegate has the managed object model, context, and store coordinator setup in it. When the app is launched and I query the fetchResultsController method in one of my views the database is created matching the scheme with the correct table names and columns in it. However the problem comes when I try to add a record to the table.
The BurpListNavController.h file has the following contents (I am just learning):
#import <UIKit/UIKit.h>
#class BurpRecordController;
#interface BurpListNavController : UINavigationController <NSFetchedResultsControllerDelegate> {
BurpRecordController *burpRecordController;
NSFetchedResultsController *fetchedResultsController;
NSManagedObjectContext *managedObjectContext;
}
#property (nonatomic, retain) IBOutlet BurpRecordController *burpRecordController;
#property (nonatomic, retain) NSFetchedResultsController *fetchedResultsController;
#property (nonatomic, retain) NSManagedObjectContext *managedObjectContext;
- (void)saveBurpLocal:(id)sender;
#end
I then have a view that records the burp, yes another one of the thousands of burp applications. haha. The following code is as follows:
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreAudio/CoreAudioTypes.h>
#class BurpLocal;
#class BurpListNavController;
#interface BurpRecordController : UIViewController <AVAudioRecorderDelegate, UIActionSheetDelegate> {
/*** Outlets to talk to the view ***/
IBOutlet UITextField *burpName;
IBOutlet UIButton *_recordButton;
/*** Standard Variables ***/
NSURL *recordedTmpFile;
//AVAudioRecorder *recorder;
NSError *error;
BurpLocal *burpLocal;
BurpListNavController *burpListNavController;
}
/*** Properties ***/
#property (nonatomic, retain) IBOutlet UITextField *burpName;
#property (nonatomic, retain) IBOutlet UIButton *recordButton;
#property (nonatomic, assign) IBOutlet BurpListNavController *burpListNavController;
#property(nonatomic, retain) BurpLocal *burpLocal;
/*** Method ***/
-(IBAction)saveRecording:(id)sender;
-(void)applicationWillTerminate:(NSNotification *)notification;
#end
When the end-user pushes the "save" button it calls the "saveRecording" method which I can step into and is great. Then I try to call the following line of code within the "saveRecording" method: [burpListNavController saveBurpLocal:sender]; thinking this will call the "saveBurpLocal" method in the nav controller and it just steps over it, does not stop at the break point in the nav controller method and then just goes to the end of the current "saveRecording" function. Does not write a record to the database or anything.
Please help! This is driving me crazy.
It's difficult to tell without more code; but it sounds like burpListNavController has not been set. When you step through the saveRecording: method, is the value of burpListNavController 0x0? If it is then you have forgotten to set that iVar somewhere.
If you have come from another language this might sound a little strange, as usually calling a method on a null pointer you cause you to crash. This isn't the case in Objective-C though, it is perfectly legal to send a message to nil; but don't expect anything to actually happen.
I have classes: PropertyCalcViewController .m & .h
In the .h I have
IBOutlet UIButton *btnGo;
#property (nonatomic, retain) IBOutlet UIButton *btnGo;
and in the .m file I have
#synthesize *btnGo;
Now I also have another class Manager .m & .h.
What I want to do is that access btnGo from the Manager class and remove it from PropertyCalcViewController like
[btnGo removeFromSuperView]
How can I do this?
To access a property, you use the "dot-syntax":
[the_view_ctrler.btnGo removeFromSuperview];
Also, I believe you mean #synthesize btnGo;, instead of #synthesize *btnGo; which is a syntax-error.
Insure that btnGo has been properly linked up in Interface Builder. Simple but common oversight.