How do you add an action to a button programmatically in xcode

Question

I know how to add an IBAction to a button by dragging from the interface builder, but I want to add the action programmatically to save time and to avoid switching back and forth constantly. The solution is probably really simple, but I just can't seem to find any answers when I search it. Thank you!

Solution 1

Try this:

Swift 4

myButton.addTarget(self,
                   action: #selector(myAction),
                   for: .touchUpInside)

Objective-C

[myButton addTarget:self 
             action:@selector(myAction) 
   forControlEvents:UIControlEventTouchUpInside];

You can find a rich source of information in Apple's Documentation. Have a look at the UIButton's documentation, it will reveal that UIButton is a descendant of UIControl, which implements the method to add targets.

--

You'll need to pay attention to whether add colon or not after myAction in action:@selector(myAction)

Here's the reference.

Solution 2

Swift answer:

myButton.addTarget(self, action: "click:", for: .touchUpInside)

func click(sender: UIButton) {
    print("click")
}

Documentation: https://developer.apple.com/documentation/uikit/uicontrol/1618259-addtarget

Solution 3

CGRect buttonFrame = CGRectMake( 10, 80, 100, 30 );
        UIButton *button = [[UIButton alloc] initWithFrame: buttonFrame];
        [button setTitle: @"My Button" forState: UIControlStateNormal];
        [button addTarget:self action:@selector(btnSelected:) forControlEvents:UIControlEventTouchUpInside];
        [button setTitleColor: [UIColor redColor] forState: UIControlStateNormal];
[view addSubview:button];

Solution 4

try this:

first write this in your .h file of viewcontroller

UIButton *btn;

Now write this in your .m file of viewcontrollers viewDidLoad.

btn=[[UIButton alloc]initWithFrame:CGRectMake(50, 20, 30, 30)];
[btn setBackgroundColor:[UIColor orangeColor]];
//adding action programatically
[btn addTarget:self action:@selector(btnClicked:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];

write this outside viewDidLoad method in .m file of your view controller

- (IBAction)btnClicked:(id)sender
{
   //Write a code you want to execute on buttons click event
}

Solution 5

 CGRect buttonFrame = CGRectMake( x-pos, y-pos, width, height );   //
 CGRectMake(10,5,10,10) 

 UIButton *button = [[UIButton alloc] initWithFrame: buttonFrame];

 button setTitle: @"My Button" forState: UIControlStateNormal];

 [button addTarget:self action:@selector(btnClicked:) 
 forControlEvents:UIControlEventTouchUpInside];

 [button setTitleColor: [UIColor BlueVolor] forState:
 UIControlStateNormal];

 [view addSubview:button];




 -(void)btnClicked {
    // your code }

View more solutions

Comments

[acecapades]

What if I want to pass a parameter to the selector when my button is pressed (eg. I have a button inside a UITableViewCell and I want to pass the object in that cell when the cell's button is pressed)?

[Nick Weaver]

@acecapades I think you are mixing two things. You can't attach a paramater like you could do with performSelector. The action pattern used by the UIControl descendant UIButton is to notifiy some target with a certain selector when controlEvent is triggered. When this happens in your case you could go up the superviews to see who is encapsulating your button and ask a method to resolve the tablecell to model relation and then do whatever you want with that.

[acecapades]

I see. That makes sense. I think I understand what you're saying. Thanks for the tip Nick!

[Nogard]

please provide some comments explaining how your sample can help.

[user2677311]

UIButton *btnNotification=[UIButton buttonWithType:UIButtonTypeCustom]; btnNotification.frame=CGRectMake(130,80,120,40);//Button Frame Setting btnNotification.backgroundColor=[UIColor greenColor]; [btnNotification setTitle:@"create Notification" forState:UIControlStateNormal];//Set the title for button [btnNotification addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];//add Target For button [self.view addSubview:btnNotification];} -(void)btnClicked { // Here You can write functionality }

[user2677311]

-(void)btnClicked { //here what ever you want you can set the action for button //Example:go to next viewcontroller nextviewController *nextPage=[nextviewController alloc]init]; [self.navigationController pushviewcontroller:nextPage animated:YES ]; }

[ErasmoOliveira]

is it possible to add 2 or more actions?

[dumbledad]

What's the ":" for after "click" in the call to UIControl.addTarget?

[Etan]

Selectors have a : as placeholders for function arguments. Since click takes the sender argument, that is replaced with a : in the selector string.

[Admin]

can someone translate this in swift?

[uplearned.com]

This worked recently for me for Swift 3. button.addTarget(self, action: #selector(ViewController.click), for: UIControlEvents.touchUpInside) func click() { print("click") } Thanks @Glauco Neves for pointing us down the right track