I want to set the value of NSTextField.
//In .h Class//I have an
IBOutlet #property (assign) IBOutlet NSTextField *tId;
//In .m Class//
#synthesize tId;
In my XIB I have connected the IBOulet to the FilesOwner.
and in my .m class I am trying to set the value to the NSTextField in the method
- (id)initWithWindow:(NSWindow *)window
{enter code here
[tId setStringValue:#"1"];
return self;
}
But the value is not getting set.
Thanks in Advance!!!!!
OKs Use this
-(BOOL)isPartialStringValid:(NSString*)partialString newEditingString:(NSString**)newString errorDescription:(NSString**)error
{
if([partialString length] == 0) {
return YES;
}
NSScanner* scanner = [NSScanner scannerWithString:partialString];
if(!([scanner scanInt:0] && [scanner isAtEnd])) {
NSBeep();
return NO;
}
return YES;
}
And then set this formatter to your NSTextField:
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
[textField setFormatter:formatter];
I'm not sure if I've understood the question correctly. I'll address the problem "I try to set stringValue to NSTextField accessing it via IBOutlet, but value in text field doesn't change", not the problem "How to customize NSTextField, so it accepts only numeric values".
NSTextField value may not be set because
method initWithWindow: isn't called
IBOutlets aren't hooked up yet when you call -[NSTextField setStringValue:].
Usually, IBOutlets are nil in initializers and are hooked up later. I'd move the line
[tId setStringValue:#"1"];
to method - (void)awakeFromNib and see if helps. According to docs
When an object receives an awakeFromNib message, it is guaranteed to have all its outlet instance variables set.
Related
I have a NSString property, self.textFromTextVC, in a Viewcontroller and it's value becomes null in the IBAction method.
- (IBAction)buttonPressed:(id)sender
{
NSLog(#"text before alarm is created: %#", self.textFromTextVC);
}
The methods below are in the same '.m' file and they keep the value of the NSString property.
-(void)setPropertyTextToReceivedText:(NSString *)text
{
self.textFromTextVC = text;
NSLog(#"text received from text VC: %#", self.textFromTextVC);
[self doesStringKeepValue]; //I call this method to check and see if the NSString value
//was retained
}
-(void)doesStringKeepValue
{
NSLog(#"keep value: %#", self.textFromTextVC); //NSString value the same from the above
//method
}
Below is how I have declared the NSString property:
#property (nonatomic, copy) NSString *textFromTextVC;
Basically, I'm setting the self.textFromTextVC before the IBAction method is called and that is why I'm confused. I'm really not sure what is going on. I have ARC selected.
I'm hoping that I'm just making a simple mistake...help?
Thanks,
Below is the method in another viewcontroller where I called setPropertyTextToReceivedText:
#implementation TextViewController
#synthesize typedText;
- (IBAction)doneButton:(id)sender {
[self.typedText resignFirstResponder];
AlarmViewController *receiver = [[AlarmViewController alloc]init];
[receiver setPropertyTextToReceivedText:self.typedText.text];
//[self showAlert];
}
What your problem is receiver is different object than your VC which is shown (present/pushed).
AlarmViewController *receiver = [[AlarmViewController alloc]init];
[receiver setPropertyTextToReceivedText:self.typedText.text];
Change this:
NSLog(#"text before alarm is created: %#", self.textFromTextVC);
To this:
NSLog(#"%#: text before alarm is created: %#", self, self.textFromTextVC);
And it will probably show you that you are indeed looking at two different object instances of the same class.
I think you forgot:
#synthesize textFromTextVC;
NSLog is returning the output 'Null" instead of a string that I would have expected. I suspect that this is a problem with private instance variables and such, but since I am not familiar with Object-oriented programming I cannot determine the cause.
//The viewDidLoad method in MainGameDisplay.m:
- (void)viewDidLoad
{
[super viewDidLoad];
Engine *engine = [[Engine alloc] init];
[engine setPlayerName: viewController];
}
The string is entered by a UITextField, the property being
//ViewController.h
#property (strong, nonatomic) IBOutlet UITextField *PlayerNameTextView;
The method works fine and returns the correct string if [engine setPlayerName: self] is placed into ViewController, but anywhere outside the location that *PlayerNameTextView is causes this problem.
//Engine.m
#implementation Engine
{
ViewController *firstPage;
}
NSString *Player;
-(void) setPlayerName: (ViewController *) name
{
Player = [[name PlayerNameTextView] text];
NSLog(#"%#", Player);
}
NSLog return type is void as you can see in it's documentation. There is no reason to expect any return value for a call to it, since it does not return anything.
Make sure that 'name' is properly initialized. Try putting an assert(name != nil) right before the NSLog. Or better yet, set a breakpoint at the NSLog and inspect the variables.
Another suggestion: Why not make the method -(void) setPlayerName:(NSString*)name? This is more straightforward than passing around pointers to view controllers, and would be easier to debug.
After many hours wasted, I officially turn to the experts for help!
My problem lies with using a NSMutableArray as an instance variable, and trying to both add objects and return the array in a method in my class. I am obviously doing something fundamentally wrong and would be grateful for help...I have already tried all the suggestions from other similar questions on stackoverflow, read apples documentation, and basically all combinations of trial and error coding I can think of. The mutable array just alway returns (null). I've even tried creating properties for them, but still the array returns (null) and then I also am running into memory management problems due to the retain while setting the property, and the init in the init method for the class.
Here is what I am trying to do:
1) Loop through a series of UISwitches and if they are 'switched on', add a string to the NSMutableArray
2) Assign this mutable array to another array in another method
Any help much appreciated,
Andy
And for some code...
fruitsViewController.h
#import <UIKit/UIKit.h>
#interface fruitsViewController : UIViewController
{
NSMutableArray *fruitsArr;
UISwitch *appleSwitch;
UISwitch *orangeSwitch;
}
#property (nonatomic,retain) NSMutableArray *fruitsArr; // ADDED ON EDIT
#property (nonatomic,retain) IBOutlet UISwitch *appleSwitch;
#property (nonatomic,retain) IBOutlet UISwitch *orangeSwitch;
- (IBAction)submitButtonPressed:(id)sender;
#end
fruitsViewController.m
#import "fruitsViewController.h"
#implementation fruitsViewController
#synthesize fruitsArr; // ADDED ON EDIT
#synthesize appleSwitch, orangeSwitch;
/* COMMENTED OUT ON EDIT
-(id)init
{
if (self = [super init]) {
// Allocate memory and initialize the fruits mutable array
fruitsArr = [[NSMutableArray alloc] init];
}
return self;
}
*/
// VIEW DID LOAD ADDED ON EDIT
- (void)viewDidLoad
{
self.fruitsArr = [[NSMutableArray alloc] init];
}
- (void)viewDidUnload
{
self.fruitsArr = nil;
self.appleSwitch = nil;
self.orangeSwitch = nil;
}
- (void)dealloc
{
[fruitsArr release];
[appleSwitch release];
[orangeSwitch release];
[super dealloc];
}
- (IBAction)submitButtonPressed:(id)sender
{
if ([self.appleSwitch isOn]) {
[self.fruitsArr addObject:#"Apple"; // 'self.' ADDED ON EDIT
}
if ([self.orangeSwitch isOn]) {
[self.fruitsArr addObject:#"Orange"; // 'self.' ADDED ON EDIT
}
NSLog(#"%#",self.fruitsArr); // Why is this returning (null) even if the switches are on?!
[fruitsArr addObject:#"Hello World";
NSLog(#"%#",self.fruitsArr); // Even trying to add an object outside the if statement returns (null)
}
#end
It seems like your init function is never called. If you're initializing this view controller from a NIB, you need to use initWithCoder. If not, just declare your fruitsArr in viewDidLoad.
Use view did load instead of init...
- (void)viewDidLoad
{
fruitsArr = [[NSMutableArray alloc] init];
}
Change that init for viewDidLoad and see what happens
Is your init method ever being called (in complicationsViewController). Add a NSLog to check this, you might be calling initWithNib: maybe.
At viewDidUnload you should remove self.fruitsArr = nil;, or, if you want to keep it, then initialize the fruitsArr in viewDidLoad (and remove it from init).
because fruitsArr don't be init.
you should do this first:
fruitsArr = [[NSMutableArray alloc] init];
so, I think you don't run - (id)init before you use fruitsArr.
I am trying to set the value of an NSTextField, but it's not working properly.
I have a button linked to an IBAction, and when I set it using self, it works fine:
#import <Foundation/Foundation.h>
#interface TestMessage : NSObject {
IBOutlet NSTextField *text;
}
- (IBAction) setMessage: (id) controller;
- (void) Message:(NSString *) myMessage;
#end
#import "TestMessage.h"
#implementation TestMessage
- (IBAction) setMessage: (id) controller {
// This works
[self Message:#"Hello"];
// but this doesn't
TestMessage * messageTest= [TestMessage new];
[messageTest Message:#"Hi"];
}
- (void) Message: (NSString *) myMessage {
[text setStringValue: myMessage];
NSLog(#"Message Was Called");
// This returns <NSTextField: 0x1001355b0> when called
// using self, but null when called the other way.
NSLog(#"%#", text);
}
#end
I've searched for a while, but still can't find the answer.
I guess it has something to do with the delegate, but I'm not sure.
Thanks in advance.
Are you sure message is called when you call it from anotherFuntion? If anotherFuntion is a method of another class, calling [self message:] won't work as you expected to...
I know this is an old post, but I have been fiddling with the same issue today.
You have to return string value in textfield:
[textField stringValue];
The code
TestMessage * messageTest = [TestMessage new];
is unusual, specifically new. I'm going to assume that new is just a class method does normal alloc/init equivalent to
TestMessage * messageTest = [[TestMessage alloc] init];
The main problem is that IBOutlet NSTextField *text will be initialized only if the class TestMessage is loaded with a Nib file. It would have to be named as the class of an object in Interface Builder, like so
and you would have to implement initWithCoder and encodeWithCoder something like this in order to extract your field value from the IB encoding:
- (instancetype)initWithCoder:(NSCoder *)coder {
self = [super initWithCoder:coder];
if (self) {
self.text = [coder decodeObjectForKey:#"text"];
}
return self;
}
-(void)encodeWithCoder:(NSCoder *)coder
{
[super encodeWithCoder:coder];
[coder encodeObject:self.text forKey:#"text"];
}
Fundamentally, IBOutlet fields do not get wired up wherever you create an instance of that class. If they did, how would you express that field A should be wired to UI object A and field B should be wired to UI object B? The connection is established only in the context of loading a class from a Nib file.
I've been stuck on this for days and each time I come back to it I keep making my code more and more confusing to myself, lol. Here's what I'm trying to do. I have table list of charges, I tap on one and brings up a model view with charge details. Now when the model is presented a object is created to fetch a XML list of users and parses it and returns a NSMutableArray via a custom delegate. I then have a button that presents a picker popover, when the popover view is called the user array is used in an initWithArray call to the popover view. I know the data in the array is right, but when [pickerUsers count] is called I get an EXC_BAD_ACCESS. I assume it's a memory/ownership issue but nothing seems to help. Any help would be appreciated.
Relevant code snippets:
Charge Popover (Charge details model view):
#interface ChargePopoverViewController .....
NSMutableArray *pickerUserList;
#property (nonatomic, retain) NSMutableArray *pickerUserList;
#implementation ChargePopoverViewController
#synthesize whoOwesPickerButton, pickerUserList;
- (void)viewDidLoad {
JEHWebAPIPickerUsers *fetcher = [[JEHWebAPIPickerUsers alloc] init];
fetcher.delegate = self;
[fetcher fetchUsers];
}
-(void) JEHWebAPIFetchedUsers:(NSMutableArray *)theData {
[pickerUserList release];
pickerUserList = theData;
}
- (void) pickWhoPaid: (id) sender {
UserPickerViewController* content = [[UserPickerViewController alloc] initWithArray:pickerUserList];
UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:content];
[popover presentPopoverFromRect:whoPaidPickerButton.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
content.delegate = self;
}
User Picker View Controller
#interface UserPickerViewController .....
NSMutableArray *pickerUsers;
#property(nonatomic, retain) NSMutableArray *pickerUsers;
#implementation UserPickerViewController
#synthesize pickerUsers;
-(UserPickerViewController*) initWithArray:(NSMutableArray *)theUsers {
self = [super init];
if ( self ) {
self.pickerUsers = theUsers;
}
return self;
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
// Dies Here EXC_BAD_ACCESS, but NSLog(#"The content of array is%#",pickerUsers); shows correct array data
return [pickerUsers count];
}
I can provide additional code if it might help. Thanks in advance.
You declare the ivar holding the array as this...
#property (nonatomic, retain) NSMutableArray *pickerUserList;
But then you have a method implemented like this:
-(void) JEHWebAPIFetchedUsers:(NSMutableArray *)theData {
[pickerUserList release];
pickerUserList = theData;
}
You aren't retaining theData and you aren't calling the synthesized setter. If you did Build and Analyze, it should catch this problem and tell you about it. If not, file a bug.