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
Related
I am very new to iPhone development. I am trying to disable an already existing button but I cant actually obtain a pointer to a specific element in the view. For instance, I have the following in the viewController header
- (IBAction)one:(id)sender;
and the implementation is
- (IBAction)one:(id)sender {
}
which are just event handlers. However, I need disable the button when view opens and I am a little bit lost on how to obtain references to elements outside of the event handler.
So in other words, my thought is to have something like:
UIButton* myButton = //something
where the something is where I am lost on what to do. Any ideas? I greatly appreciate any help I get on here!
You need to create a property for your button in the interface:
#property(nonatomic, retain) IBOutlet UIButton * button;
And add this to implementation:
#synthesize button;
Then connect the button to it in interface builder. After this you can disable the button by:
button.enabled = NO;
Hope I could help!
Just give tag to your button and access your button with tag value.
UIButton *btn = (UIButton*)[self.view viewWithTag:1];
[btn setHidden:YES];
In your .h File
#import <UIKit/UIKit.h>
#interface RpViewController : UIViewController
#property (retain , nonatomic)IBOutlet UIButton *Btn1;
#end
In your .m file , in implementation write this :
#synthesize Btn1;
Now on interface , click on button.
In button's properties - > Drawings - check Hidden checkbox.
Wherever you want to show that button , just write.
[Btn1 setHidden:FALSE];
#property (strong, nonatomic) UIButton *button;
#synthesize button;
// In View Did Load...
self.button = [UIButton buttonWithType:UIButtonTypeCustom]; // button can be of any type.
[self.button setTag:1];
// if you have more buttons initialize it and set its tag. you can get to know which button was pressed using tags.
[button addTarget:self action:#selector(buttonEvent:) forControlEvents:UIControlEventTouchUpInside];
-(void) buttonEvent:(UIButton *) sender
{
NSLog(#"%d",sender.tag);
if(sender.tag == 1)
{
[self.button setEnabled:NO]; // This makes your button disabled, i.e you can see the button but you cannot click on it.
[self.button setHidden:YES]; // This makes your button hidden.
}
}
if you have more doubts ping me back.
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
If I had a label and a button If i touch outside the button and swiped over the button then an event should be fired to display "hello" in the label field. tell me how can I do it?
Please do following steps.
Take UILabel and UIButton in your XIB file.
Take UILabel and UIButton as IBOutlet in your ViewController's .h file and take property of this two described below.
UILabel *lbl;
UIButton *btn;
#property(nonatomic, retain)IBOutlet UILabel *lbl;
#property(nonatomic, retain)IBOutlet UIButton *btn;
Now set UILabel and UIButton's New Reference outlet from XIB and set UIButton's TouchUpInside link to btnClicked method.
Declare this method in your .h file and implement it in your .m file for button event.
Write this in your .h file
-(IBAction)btnClicked:(id)sender;
and place this code in your .m file
-(IBAction)btnClicked:(id)sender
{
lbl.text = #"Hello";
}
This is simple...
UIButton * button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; // init a button
[button addTarget:self action:#selector(buttonDraggedOrTouchedOutSide:)
forControlEvents:UIControlEventTouchDragEnter|UIControlEventTouchDragInside
|UIControlEventTouchUpOutside];
[self.view addSubview:button]; // add button to view
-(void)buttonDraggedOrTouchedOutSide:(id)sender {
//Do your stuff
}
Thats it..Now you can catch drag and touch outside events...
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...
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.