I'm currently working on an app where the user has the option to either swipe through data, or use a button to go through the data. I'm having trouble understanding how to combine two bits of code.
Here is the code I'm using for swiping:
- (void)swipeRight:(UISwipeGestureRecognizer*)recognizer
{
if ([questions hasPrevQuestion] == YES) {
[self vorige:nil];
}
}
(the [self vorige:nil]; is calling the method for the button, so the swiping and the button have the same behavior)
and I need to somehow incorporate this code which applies to the button:
-(void)animationDidEndOnAnswer {
[vorigeButton addTarget:self action:#selector(newQuestion:) forControlEvents:UIControlEventTouchUpInside];
}
I think it's pretty simple, but I just cannot for the life of me figure out how to call the swiping method place of the button here...I'm thinking it's simple because I found this example in the UIGestureRecognizer class reference:
- (void)addTarget:(id)target action:(SEL)action
but being new to objective-c, I don't really know what to do with this. any help is very appreciated.
- (void)addTarget:(id)target action:(SEL)action is the code equivalent of binding a button action to a method like you do when you ctrl-drag from a button to an IBAction in Interface Builder.
So if your method is called vorige: and you want it to be called when the button is tapped, you would say:
[vorigeButton addTarget:self action:#selector(vorige:) forControlEvents:UIControlEventTouchUpInside];
But I don't know why you would want to do that as a result of an animation - you normally would set the button action once when the view is loaded, not change it during an animation.
Nick's solution is good.
if you want to call the same method for the swiping & the tap on your button, you can tweak your swipeRight like this:
- (void)goThrougtData:(id)sender
{
if( [sender isKindOfClass:[UISwipeGestureRecognizer class]] ) {
// swipe specific code
}
else if( [sender isKindOfClass:[UIButton class]] ) {
// tap specific code
}
if ([questions hasPrevQuestion] == YES) {
[self vorige:nil];
}
}
and in your init method, you add
[mySwipeRecognizer addTarget:self action:#selector(vorige:)];
[vorigeButton addTarget:self action:#selector(vorige:) forControlEvents:UIControlEventTouchUpInside];
Related
I've got a UIButton that acts as a switch.
When user taps on it, its state changes to "selected" and action "one" is called. When user taps again UIButton state changes to "not selected" and the action is no longer available.
Is there a way to set the UIButton to "selected" by taping on a completely different UIButton and have it change to "selected" and call the same action as well?
Cheers
From what I have understood from the question, I would like to give you my suggestion
if (!<your_button>.selected)
{
<your_button>.selected = YES;
// do your stuff here
}
else
{
<your_button>.selected = NO;
// do your stuff here, in your case action should be no longer available so that,
<your_button>.userInteractionEnabled = NO;
}
Enjoy Programming !
try like this,'
-(IBAction)nextbutton:(id)sender{
UIButton *btn=(UIButton *)[self.view viewWithTag:tagValue];//pass tag value of that particuler button
btn.selected=YES;
//do whatevr you want.
}
simple thing when you tap on the uibutton make an action for that and in the action for that button , you can set the button state to selected and then in the next line of code you can call that method (action)
- (IBAction)btn1Touched:(id)sender {
[_btn2 setSelected:YES];
[self btn2Touched:self];
}
- (IBAction)btn2Touched:(id)sender {
NSLog(#"btn Action called");
}
UIbutton has state called selected and it is managed via property selected
so to make a button to selected state
[buttonInstance setSelected:YES];
To make it unselected use
[buttonInstance setSelected:NO];
Kindly write a function for that button action like,
-(void)Buttonaction
{
do your action here
also set your button has selected state.
buttonname.setselected=yes;
}
call this function while you are tabbing your button.
Do This:
-(IBAction)switchButtonClicked:(UIButton*)sender
{
if(sender.isSelected)
{
.....
}
else
{
...
}
[sender setSelected:!sender.isSelected];//This will work as Switch.
}
set Selected(Switch ON) and default(Switch OFF) property (image and title) of UIButton from XIB, OR from Code as you want.
With a single button you can do you functionality with this code
I am developing for iPhone the app I am developing has many buttons and I want all buttons to call the same class but with different parameter
for example I want button1 to call the displayimageclass
and button2 should call the same class displayimageclass so, how to different method call same class and in that same class how to fetch different button from where it is call to particular class.
That is pretty much standard. Just define as many IBAction methods as you need.
In the viewController's .h file:
- (IBAction)actionButton1:(UIButton *)sender;
- (IBAction)actionButton2:(UIButton *)sender;
- (IBAction)actionButton3:(UIButton *)sender;
And in its .m file:
{
//react here to button1 pressed
}
- (IBAction)actionButton1:(UIButton *)sender
{
//react here to button1 pressed
}
- (IBAction)actionButton2:(UIButton *)sender
{
//react here to button2 pressed
}
- (IBAction)actionButton3:(UIButton *)sender
{
//react here to button3 pressed
}
Then associate the action with the Button's events (TouchUpInside would be most appropriate, I guess).
You should add tag property to your buttons.
Suppose your buttons are
button1.tag =1;
button2.tag =2;
button3.tag =3;
When you click any button, NSLog shows related button tag number. i.e You will get your result what you want.
- (IBAction)buttonClicked:(id)sender {
UIButton* button = (UIButton *)sender;
NSLog(#"The number of tag:%d",button.tag);
}
I think it will be helpful to you.
you can implement your action method like this:
- (IBAction)action:(UIButton *)sender
{
//sender will be different for different button
}
Set tag value for buttons and get those buttons like
- (IBAction)action:(UIButton *)sender
{
UIButton *btn = (UIButton*)sender;
}
Are you looking for
1) several buttons performing the same method with the same behavior
2) several buttons performing the same method but having different behavior based on the button characteristics
3) each button performing its own method.
1) You can register several buttons on the same IBAction, they all will call it and perform the same code
2) In the method were all the buttons are registered (cf: 1) it is possible to sort the buttons by subclassing the UIButton class, giving an enum value that represents what the button should perform and then in the called method check the enum value with a switch in order to trigger the wanted behavior
The UIBarButtonItem already has this tag property so you could use them by giving a value to each of your UIBarButtonItem in the Interface Builder and set them to call the following method
- (IBAction) myButtonsMethod:(id)object
if ([object isKindOfClass:[UIBarButtonItem class]])
{
switch ([(UIBarButtonItem *)object tag])
{
case myFirstTagValue
...
}
3) #Hermann Klecker solution is the right one.
To clarify my question, my program has three lightbulb on the screen (Customized UIButton)
when any lightbulb is pressed, I programatically generate a UIView with a switch on it
when I turn on the switch, corresponding lightbulb will light up (change its background image)
However, I have trouble accessing this UISwitch since I can't declare it publicly
My code goes something like this:
#property buttonA;
#synthesize buttonA;//all three buttons have their background image set to 'off.png'
- (IBAction)lightBulbPressed:(UIButton *)sender
{
UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(1,1, 64, 64)];
UISwitch *mySwitch = [[UISwitch alloc] initWithFrame:CGRectMake(0,0,64,64)];
[mySwitch addTarget:self action:#selector(onOrOff) forControlEvents:UIControlEventValueChanged];
[myView addSubview:mySwitch]
[self.view addSubview:myView];
}
So what troubles me is how to program the selector onOrOff, so that it knows which switch is being touched and change the background image of corresponding button accordingly.
Think about your method:
- (IBAction)lightBulbPressed:(UIButton *)sender {
// your method
}
You already know who called it. This piece of information is stored in sender.
So you can save it and use later in onOrOff
By the way, if you are using UISwitch you have to check
UIControlEventValueChanged
and not UIControlEventTouchUpInside.
EDIT: To pass your sender you can store its value to a NSString *buttonTapped declared in your .h file
- (IBAction)lightBulbPressed:(UIButton *)sender {
if (sender == bttOne) {
buttonTapped = #"ButtonOneTapped";
} else if (sender == bttTwo) {
buttonTapped = #"ButtonTwoTapped";
} else if (sender == bttThree) {
buttonTapped = #"ButtonThreeTapped";
}
// your method
}
- (void)onOrOff {
if ([buttonTapped isEqualToString:#"ButtonOneTapped"]) {
// Button One
} else if ([buttonTapped isEqualToString:#"ButtonTwoTapped"]) {
// Button Two
} else if ([buttonTapped isEqualToString:#"ButtonThreeTapped"]) {
// Button Three
}
}
One way to do so, is taht you give them distinct tag numbers in IB, and in - (IBAction)lightBulbPressed:(UIButton *)sender method, get their tag. e.g. NSInteger pressedButtonTag = [sender tag];, and go from there.
Also, instead of alloc/init myView every time user presses a button, you can add that view in IB, add the switch to it, put in the hierarchy of the owner but not the view, and set an outlet to it in .h. Call it whenever you need it, and again, access the switch by tag e.g. ( UISwitch *mySwitch = (UISwitch *)[myView viewWithTag:kSwitchTag]; ) and do whatever you want to do (on or off), add it to the subview and remove it later. This is more efficient.
I want one of my button to act different on different taps. Because its the same button i am using every time a particular action happens.
Is there a way to do this?
Thanks,
Add an additional UIGestureRecognizer ;)
Single tap is the action what will be linked but you can add other kind of gestures like double tap, swipe, etc.
You can use the tag property of button; so inside your IBAction method.
-(void)buttonClicked:(id)sender{
UIButton *button = (UIButton *)sender;
if (button.tag == 1) {
// perform your required functionality
button.tag = 2;
}
else if (button.tag == 2) {
// perform your required functionality
button.tag = 3;
}
else if (button.tag == 3) {
// perform your required functionality
button.tag = 1;
}
}
And don't forget to set initial tag value to 1.
If you want your button to act different you would create different methods to do the different actions. Then whenever you want the buttons behaviour to change you should set the button to handle the desired action.
So for the first action:
[button addTarget:self action:#selector(method1:) forControlEvents:UIControlEventTouchUpInside];
- (void) method1
{
//set button to handle method 2
[button addTarget:self action:#selector(method2:) forControlEvents:UIControlEventTouchUpInside];
}
- (void) method 2
{
}
The button just calls a method in your view controller when tapped. From there you do something like this:
if (internalState == FOO) {
[self doA];
} else {
[self doB];
}
I have the following code
-(IBAction)ATapped:(id)sender{
//want some way to hide the button which is tapped
self.hidden = YES;
}
Which is linked to multiple buttons. I want to hide the button which triggered this IBAction.
self.hidden is obviously not the button.
How do I hide the button which was tapped? The sender.
Thanks
Both Vladimir and Henrik's answers would be correct. Don't let the 'id' type scare you. It's still your button object it's just that the compiler doesn't know what the type is. As such you can't reference properties on it unless it is cast to a specific type (Henrik's answer).
-(IBAction)ATapped:(id)sender{
// Possible Cast
UIButton* myButton = (UIButton*)sender;
myButton.hidden = YES;
}
Or you can send any message (call any method) on the object, assuming YOU know the type (which you do, it's a button), without having to cast (Vladimir's answer).
-(IBAction)ATapped:(id)sender{
//want some way to hide the button which is tapped
[sender setHidden:YES];
}
Send setHidden message to sender:
-(IBAction)ATapped:(id)sender{
//want some way to hide the button which is tapped
[sender setHidden:YES];
}
Your getting the button object (id) provided as a parameter
-(IBAction)ATapped:(id)sender{
// Possible Cast
UIButton* myButton = (UIButton*)sender;
myButton.hidden = YES;
}
If you want bullet proof cast/messaging, try this:
-(IBAction)ATapped:(id)sender{
// Secure Cast of sender to UIButton
if ([sender isKindOfClass:[UIButton class]]) {
UIButton* myButton = (UIButton*)sender;
myButton.hidden = YES;
}
}
And... if you want to change the backgroundcolor of a button, the correct code will be like this?
[sender setBackgroundColor:(NSColor *)redColor];
for example? ... because it is´nt works for my...