I have a a xib with a toolbar and on that I have 2 buttons all made in IB.
I can connect my outlets to the buttons but when I click them the method isn't triggered?
Why is that?
In my header file I have this:
#property (nonatomic, retain) IBOutlet UIBarButtonItem *cancelEntry;
#property (nonatomic, retain) IBOutlet UIBarButtonItem *saveEntry;
-(IBAction) cancelEntry:(id) sender;
-(IBAction) saveEntry:(id) sender;
In my .m file I got this:
-(IBAction) cancelEntry:(id) sender {
NSLog(#"cancel");
}
-(IBAction) saveEntry:(id) sender {
NSLog(#"save");
}
All compiles as it should but no nothing in the log when clicking the buttons.
What should I do to get it to work?
Sounds like you connected your outlets to the buttons, but didn't connect the buttons to the actions.
Right click Cancel the UIBarButtonItem in Interface Builder.
Hover over Selector, then drag the + that appears onto File's Owner.
Connect it to cancelEntry:.
Repeat for Save.
Instead of using (id) for your IBActions, you should probably use (UIBarButtonItem *). That'll prevent you from connecting a different object type to those IBActions.
Related
I am a beginner in Xcode, and I have a problem.
I have 2 buttons:
- (IBAction) HIGH1: (id) sender
- (IBAction) HIGH2: (id) sender
When the user clicks the HIGH1button, I want to change the background (with image) of the button HIGH2.
How can I achieve this?
You need to create IBOutlet for the buttons to change them.
Control+drag the buttons from Interface Builder to the .h file to create the outlets. Something like this:
#property (weak, nonatomic) IBOutlet UIButton *HIGH1;
#property (weak, nonatomic) IBOutlet UIButton *HIGH2;
//Dont forget to #synthesize
On the IBAction method you then call:
- (IBAction) HIGH1: (id) sender
{
self.HIGH2 setBackgroundImage:[UIImage imageNamed:#"myButtonImage"] forState:UIControlStateNormal];
}
Make sure you have an image with the name you choose in your application bundle, and that the IBOutlet to the buttons is properly connected (The gray circle on the left size of the IBOutlet must have a small black circle inside it)
[HIGH1 addTarget:self
action:#selector(buttonDidPushed)
forControlEvents:UIControlEventTouchUpInside];
then,
-(void)buttonDidPushed
{
HIGH2.backgroundColor = [UIColor blackColor];
[self.view addSubview:HIGH2];
}
I hope this code help you.
access your ivar from HIGH2 and set setBackgroundImage:forState: on HIGH1
I want to make a drop down list for iphone application i want that when user click it show list and when click on any button it shows that value and hides list i have implemented using the follwoing code but this work only for one value not for others
#interface DropDownViewController : UIViewController {
IBOutlet UILabel*ddText;
IBOutlet UILabel*ddMenu;
IBOutlet UIButton*ddMenuShowButton;
}
#property (nonatomic, retain) IBOutlet UILabel *ddText;
#property (nonatomic, retain) IBOutlet UIView *ddMenu;
#property (nonatomic,retain) IBOutlet UIButton *ddMenuShowButton;
- (IBAction)ddMenuShow:(UIButton *)sender;
- (IBAction)ddMenuSelectionMade:(UIButton *)sender;
#end
#implementation DropDownViewController
#synthesize ddMenu, ddText;
#synthesize ddMenuShowButton;
- (IBAction)ddMenuShow:(UIButton *)sender
{
self.ddMenu.hidden = NO;
[sender setTitle:#"▲" forState:UIControlStateNormal];
}
- (IBAction)ddMenuSelectionMade:(UIButton *)sender
{
self.ddText.text = sender.titleLabel.text;
[self.ddMenuShowButton setTitle:#"▼" forState:UIControlStateNormal];
self.ddMenu.hidden = YES;
}
I have three button red grenn blue first is red it works only for red only not for others how to solve this i have used this following this tutorial
http://www.edumobile.org/iphone/iphone-programming-tutorials/a-simple-drop-down-list-for-iphone/
Add UIbutton near your textfield.While clicking that button create UITableview according to your textfileld size.(Hope you know about creating Uitableview)and then load your listview contents in "cellForRowIndex".While selecting the row of the table,you can get the value from "didselectrowatIndexPath" and load it in textfield.After that remove UItableview.
It would be good if you use iPhone tools in your application. You should use UIPickerView in the place of drop down list. It looks good and provides better interface in mobile application
I'm just starting with Objective C, but I'm already running into a problem:
When I did this in the past, I had no problem with it:
I made a new UISlider, clicked it, CTRL dragged a blue line to the code, and somehow I was then able to read it's values.
However, I am now running into the problem that I can't draw those lines anymore.
By messing around I managed to get buttons to work, but the slider just won't work.
my Mainwindow.xib has got the iSaturateViewController class,
iSaturateViewController.xib has got the whole interface in it.
How can I get the UISlider to work without being able to draw that line?
How I have it now:
(in iSaturateViewController.h)
#import <UIKit/UIKit.h>
#interface iSaturateViewController : UIViewController {
UISlider * satSlider;
UILabel * satLabel;
}
#property (nonatomic, retain) IBOutlet UISlider * satSlider;
#property (nonatomic, retain) UILabel * satLabel;
-(IBAction) changeSaturation:(id) sender;
#end
(in iSaturateViewController.m):
#synthesize satLabel,satSlider;
-(IBAction) changeSaturation:(id)sender {
satLabel.text = [[NSString alloc] initWithFormat:#"Saturation: %d ", (Float32)satSlider.value];
NSLog(#"%f", satSlider.value);
}
Ath the moment the NSLog shows: 0.00000000
Also, I've set the Label in the Identity properties to: satSlider (slider) and satLabel (label).
Just to clarify my goal:
I want the slider's (satSlider) value to show in the UILabel (satLabel) via the function changeSaturation.
How can I do this?
Add the method declaration:
-(IBAction) changeSaturation:(id)sender;
to the header file iSaturateViewController.h
Then, assign the Value Changed action of your UISlider to your changeSaturation method. Right click on the slider and drag the Value Changed to the File's Owner and connect them. It should work.
You can also try this:
-(IBAction)changeSaturation:(id)sender {
UISlider *slider = (UISlider *)sender;
satLabel.text = [NSString stringWithFormat:#"Saturation: %f", slider.value];
NSLog(#"Saturation: %f", slider.value);
}
Regarding UILabel - add IBOutlet and connect it in the Interface Builder. The interface should be like that:
#import <UIKit/UIKit.h>
#interface iSaturateViewController : UIViewController {
IBOutlet UISlider * satSlider;
IBOutlet UILabel * satLabel;
}
#property (nonatomic, retain) IBOutlet UISlider * satSlider;
#property (nonatomic, retain) IBOutlet UILabel * satLabel;
-(IBAction) changeSaturation:(id) sender;
#end
Let me know if it works.
Looks like the key thing you’re missing is that the satSlider outlet isn’t hooked up, so its value is nil. You connected the slider’s action to the -changeSaturation: method, but it sounds like you didn’t also connect the satSlider property to the slider itself. Sending a message (like value in this case) to nil doesn’t do anything, and returns 0, so 0 is the value you’re getting out of it. Hook up your outlet by Ctrl-dragging from the property in the code to the slider in your UI and it should work.
You need to edit your header and add the method declaration. Then in IB, associate the first responder for value changed to the UISlider. Also slider.value, you need to read article: Setting interval value for UISlider
I'm getting frustrated because I am failing to have any control over my bar button items or my UIToolbar. I am trying to disable a UIBarButtonItem, but it continues to respond to touch events. Here is what I have done, the code is so simple I don't know why it isn't working.
in my .h:
IBOutlet UIBarButtonItem *button;
#property (nonatomic,retain) IBOutlet UIBarButtonItem *button;
and in .m:
#synthesize button;
-(void)function{
button.enabled = false;
}
Am I doing something wrong with the viewcontroller delegate? I don't understand why I get no response. Thanks for your help.
This is correct:
button.enabled = false;
So are you sure that this method is actually being called? (And if this is your actual code, you have a method called 'function'?)
You might be able to achieve this with:
button.target = nil;
button.action = nil;
More:
http://developer.apple.com/library/ios/ipad/#documentation/uikit/reference/UIBarButtonItem_Class/Reference/Reference.html
did you connect the button in the xib file to the outlet in the .h file? You may have set the target/IBAction, but you need to setup the reciprocal path. i.e. dragging from the File Owner, which is most likely the viewController, to the button. Then selecting the name of the IBOutlet in your .h file.
Good luck
i have done like
#interface tabViewController : UIViewController
{
IBOutlet UIButton* button_first;
IBOutlet UIButton* button_second;
IBOutlet UIButton* button_third;
IBOutlet UIButton* home;
}
but i could not in file owner those button? what i have to do? any help please? i have set everything correctly (viewcontroller, view)...the day before it was working...i tried in interface builder to reload classes etc...why it happens?
You should have this:
VC Header file:
#interface tabViewController : UIViewController
{
IBOutlet UIButton* button_first;
IBOutlet UIButton* button_second;
IBOutlet UIButton* button_third;
IBOutlet UIButton* home;
}
- (IBAction) ButtonMethod;
VC .m file:
- (IBAction) ButtonMethod
{
// Code goes here
}
You should now be able to link to the "ButtonMethod" in Interface Builder. Right click the button, click on the circle next to "Touch Up Inside" and link it to "ButtonMethod".
Hope that helps.
EDIT:
This images doesn't show the blue line that appears when selecting but shows what you have to press:
Did you declare them as properties?
Using:
in .h-fle
#property(nonatomic, retain) UIButton *button_first;
And in .m-file:
#synthesize button_first?
?
have a look at the nib file. may be you have changed the class of that nib file.
Check out whether you see tabViewController in fornt of File's owner.
I am sure you have changed the class so the change is not getting reflected of IBOUTLET in files owner.
and as told by #GUBB its not at all required to set hte property and synthesis of the stuffs..
hAPPY cODING...