I'm completely new to Xcode and Objective-C but I have succeeded in creating a btton and when the user clicks this button a number is displayed in a textfield, but I can't seem to find a way to put text in there.
-(IBAction) button1pressed: (id) sender {
[field1 setIntValue:36];
}
-(IBAction) button1pressed: (id) sender {
[field1 setStringValue:#"some text"];
}
Method inherited from NSControl, Documentation here: http://developer.apple.com/library/mac/documentation/cocoa/reference/ApplicationKit/Classes/NSControl_Class/Reference/Reference.html#//apple_ref/occ/instm/NSControl/setStringValue:
Make sure your properly making connections in xCode between the IB Text field (I assume your using IB since you're using IBAction) and the IBOutlet NSTextField *field1; instance variable.
Related
I have a textfield and a button. When I click inside the textfield, I want the button to disappear. I defined the textfield as both outlet and action ( with event “Did end on exit”). In the method for the textfield, I have self.testButton.hidden = YES; When I click inside the textfield, the button does not go away. Instead, it remains until I hit the return key on the keyboard – causing the keyboard to go away. I tried the same thing w/ touchup inside as the event on the text field. When you click in the text field, nothing happens to the button.
Instead of using the Target-Action mechanism ("Did end on exit" and "Touch Up Inside") use the Delegate mechanism.
First, make your class conform to the UITextFieldDelegate protocol. In your *.h (header) file add the following:
// Here I'm assuming your class is inheriting from UIViewcontroller but it
// may be inheriting from some other class. The really important part here
// is: <UITextFieldDelegate>. That's how you make your class conform to that protocol
#interface THE_NAME_OF_YOUR_CLASS : UIViewController <UITextFieldDelegate>
.
Second, implement the -(void)textFieldDidBeginEditing:(UITextField *)textField method. Also, remember to set yourself as the delegate too: self.textField.delegate = self. That way, the method will get called every time the user starts editing. Inside that methdod call self.testButton.hidden = YES;. In your *.m (implementation) file add the following:
-(void)viewDidLoad {
// here I'm assuming you have a 'strong' reference to your text field.
// You're going to need one to set yourself as the delegate.
self.textField.delegate = self;
}
// This is one of the methods defined in the UITextFieldDelegate protocol
-(void)textFieldDidBeginEditing:(UITextField *)textField {
self.testButton.hidden = YES;
}
.
Similarly, to make your button appear again, implement the - (void)textFieldDidEndEditing:(UITextField *)textField method. Inside it un-hide your button. Again, in your *.m file add the following:
// This is another method defined in the UITextFieldDelegate protocol
-(void)textFieldDidEndEditing:(UITextField *)textField {
self.testButton.hidden = NO;
}
Although delegates may be a mystery to you right now once you become familiar with them
you will realize they're very easy. And this is very important because iOS programming
relies heavily on delegates.
A delegate is a "notification" mechanism based on the "Hollywood" principle which is: don't call us; we'll call you.
In your case the class that contains the UITextField is interested in knowing when the UITextField begins editing and when it ends editing. But your class cannot be "polling" (that is, constantly asking) the text field to find out if the state changed. Instead you register your class with the text field and it will be the text field the one that will let you know when something happened. That will be thanks to the methods that you implemented.
Further reading: protocols and delegates
Hope this helps!
Have you made sure that testButton has its IBOutlet set before you hide it?
If you want to button to disappear when the user begins editing the text field, try UIControlEventEditingDidBegin.
I saw this answer of how to create a placeholder for UITextView.
I took the following steps:
Add to the .h class the declaration:
#interface AdjustPhotoViewController : UIViewController<UITextViewDelegate>
Added the method:
- (BOOL) textViewShouldBeginEditing:(UITextView *)textView
{
NSLog(#"%d",[textView tag]);
if ([textView tag]==1){
campaignTitle.text = #"";
}else{
campaignDescription.text = #"";
}
return YES;
}
But I don't see that the method is being invoked!
What am I missing?
textView is already delegated via the storyboard to the view
SOLVED:
The problem was that it wasn't delegated. Although I was using storyboard - it was only an outlet, not a delegate.
Remember that if you are using storyboard, you need to delegate also from the text view to the orange button of the view! not only the other way
What am I missing?
Actually setting the delegate.
textView.delegate = self;
Merely conforming to a protocol won't magically make your object into the delegate of an arbitrary object; that's just a formal thing, and anyways, how on Earth would the UITextField know which particular instance of the class it has to assign its delegate?
I've created a button on one viewController that loads another view modally using the UIModalPresentationFormSheet presentation style. On this loaded view, I have two textFields, and I'm forcing the first textField to be first responder so that the keyboard will appear immediately with the new view. I've set up the textFields to have an action method that is hooked up to "Did End on Exit" event. However, whenever I hit "return" on the keyboard for either textField, the keyboard fails to go away (Here is my code):
// addCustomPage method that is called when button from original view is touched
- (IBAction) addCustomPage:(id)sender
{
NSLog(#"Adding Custom Page");
if (!self.customPageViewController)
{
self.customPageViewController =
[[CustomPageViewController alloc] initWithNibName:#"CustomPageViewController" bundle: nil];
}
customPageViewController.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:customPageViewController animated:YES];
// force keyboard to appear with loaded page on the first textField
[customPageViewController.firstTextField becomeFirstResponder];
}
#interface CustomPageViewController : UIViewController
#property (strong, nonatomic) IBOutlet UITextField *firstTextField;
#property (strong, nonatomic) IBOutlet UITextField *secondTextField;
- (IBAction)keyboardEndOnExit:(id)sender; // DID END ON EXIT EVENT
#end
//in CustomPageViewController.m
-(IBAction)keyboardEndOnExit:(id)sender
{
[sender resignFirstResponder];
}
This is a fairly straight forward problem, and I have no problem normally dismissing keyboards using this technique with basic views and textFields. I'm not sure if using a view in this presentation format, or set up makes things different. Thanks!
You have confirmed that you keyboardEndOnExit method is actually being called?
You could also take a more direct approach by calling [yourTextView resignFirstResponder] when a specific action is take by the user, such as a key pressed etc. I would still check if that method is ever being called using breakpoints or a log.
Have a look at this question. Pretty sure it is the same problem caused by UIModalPresentationFormSheet.
Working on an experiment on the iPad. Tried some variations on how to do this, but I can't seem to get it to work correctly...
I tap a UIButton on my MainViewController and a TextEntryModule is added to the view. TextEntryModule is its own class (for multiple instantiation) and it contains a UITextView called TextEntry (this all works at the moment).
I tap on the TextEntry UITextView and it brings up the keyboard and another view (located in MainViewController) with a UITextView called TextPreview. (this also works at the moment).
The part I'm having trouble with is synching the two UITextViews. The idea being that when I type into TextEntry, the text in TextPreview will also be updated.
Outlets are linked properly for the text fields, but I think I'm missing something "obvious":
TextEntryModule *tm = (AnnotationModule *)currentModule;
TextPreview.text = tm.TextEntry.text
Thanks in advance!
UITextView: delegate.
- (void)textViewDidChange:(UITextView *)textView
Then assign it the value of the other textview in this method.
Edit
#interface MainViewController <UITextViewDelegate> {
...
}
...
#end
Then you implement this method in the implementation file of MainViewController
#implementation MainViewController
//More code
- (void)textViewDidChange:(UITextView *)textView {
TextEntryModule *tm = (AnnotationModule *)currentModule;
TextPreview.text = tm.TextEntry.text
}
#end
Then you will have to set the TextEntryModule object's delegate to self since the controller now conform to the protocol and can "act" upon this notification.
You need to become a UITextFieldDelegate and monitor when text changes in the one field and then update the other field. Take a look at the documentation on it.
::Edit::
It works now? haha, maybe I just didn't save my latest IB...who the hell knows.
Thanks!
Hey,
This is my first time playing around with desktop applications (I have experience with iphone applications) and I'm stuck - My text view will not update to show any text:
.m:
#synthesize textView;
NSString *txt = [[[NSString alloc] initWithData:responseData encoding: NSASCIIStringEncoding] autorelease];
NSLog(#"txt = %#", txt);
[textView setString:txt];
.h:
IBOutlet NSTextView *textView;
}
#property(nonatomic, retain) IBOutlet NSTextView *textView;
And IB says textView -> Text View, so everything looks good:
NSLog above outputs the contents of the url resource Im fetching
So, what am I missing?
Double check if the outlets are done in IB. That's probably the reason (textView is probably nil here).
Where is this setString code being called? It's possible the IB outlet isn't instantiated yet. You can check this with a simple
if (textView) {
NSLog(#"textView is not nil);
} else {
NSLog(#"textView is nil");
}
To be sure that everything is set up when you call this, make sure it's after 'awakeFromNib' is called in any objects created through IB.
See NSNibAwaking Protocal
Can you double check NSTextView properties like isEditable, textColor etc to make sure none of them are set incorrectly.
Other than that the code looks good.
I reconnected everything in IB, saved, rebuilt and it worked...= [