Programmatically code UIButton action

Question

I'm trying to create a button, which once tapped will show a popover of another UIView. To test this out, I have the following code in my viewDidLoad section:

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.hard1 = [UIButton buttonWithType:UIButtonTypeCustom];
    [self.hard1 setFrame:CGRectMake(884, 524, 105, 60)]; // set the x,y,width and height based on your specs
    UIImage *buttonImage = [UIImage imageNamed:@"green.jpg"];
    hard1.layer.cornerRadius = 10;
    hard1.clipsToBounds = YES;
    [hard1 addTarget: self
              action: @selector(buttonClicked:)
    forControlEvents: UIControlEventTouchUpInside];
    [self.hard1 setImage:buttonImage forState:UIControlStateNormal];
    [self.view addSubview:self.hard1];
}

and further down:

- (IBAction) buttonClicked: (id)sender
{
    NSLog(@"Tap");
}

however, the console does not log 'Tap' when I hit the button. Any ideas?

[IOS 14 SDK: you can add action with closure callback:](https://stackoverflow.com/questions/5843427/how-do-you-add-an-action-to-a-button-programmatically-in-xcode/640871599#answer-64087159) — Ucdemir, Sep 27 '20 at 10:02

score 12 · Accepted Answer · answered Feb 24 '13 at 17:34

Watch these three lines of code:

hard1.layer.cornerRadius = 10;
hard1.clipsToBounds = YES;
[hard1 addTarget: self
          action: @selector(buttonClicked:)
forControlEvents: UIControlEventTouchUpInside];

You are missing self. in all three. They should be:

self.hard1.layer.cornerRadius = 10;
self.hard1.clipsToBounds = YES;
[self.hard1 addTarget: self
          action: @selector(buttonClicked:)
forControlEvents: UIControlEventTouchUpInside];

Also, if you are creating it programatically, it shouldn't be an IBAction (IB stands for interface builder and this is not created in interface builder).

Now that I'm on it. When you create a property do this in synthesize: @synthesize hard1 = _hard1; This way referring to the property as just "hard1" wont work. It's either self.hard1 or _hard1 (the latter only to be used in the setter method) — Odrakir, Feb 24 '13 at 17:38

score 4 · Answer 2 · answered Feb 24 '13 at 17:44

4

    self.hard1 = [UIButton buttonWithType:UIButtonTypeCustom];


 [hard1 addTarget: self
              action: @selector(buttonClicked:)    forControlEvents: UIControlEventTouchUpInside];

Replace hard1 to self.hard1

answered Feb 24 '13 at 17:44

Kiran

345
1
4
16

score 0 · Answer 3 · answered Feb 24 '13 at 17:31

0

You have put the event responder as buttonClicked but in IBAction you have defined buttonTap. This would obviously not work...

It should be

[hard1 addTarget: self
              action: @selector(buttonTap:)
    forControlEvents: UIControlEventTouchUpInside];

answered Feb 24 '13 at 17:31

Srikar Appalaraju

71,928
54
216
264

I made a typo. My actual code is edited above, still doesn't work. – Louis Holley Feb 24 '13 at 17:32

Programmatically code UIButton action

3 Answers3