IOS UIButton Target doesnot working - ios

Question

here is my code
for (NSString *message in self.messages) {
label = [[UIButton alloc] initWithFrame:CGRectZero];
[label setTitle:message forState:UIControlStateNormal];
//label.titleLabel.text = message;
label.tag = i;
[label addTarget:self action:#selector(gototest:) forControlEvents:UIControlEventTouchDown];
CGSize size = [message sizeWithFont:label.titleLabel.font];
CGFloat width = size.width + kPADDING;
label.frame = CGRectMake(xPos, 0.0, width, self.frame.size.height);
[self addSubview:label];
i++;
xPos += width;
}
-(void)gototest:(UIButton*)sender
{
int tag = sender.tag;
NSLog(#"test %#",#"ccc ");
}
So nothing happen when I click on the buttons.
Note that the class is extend from UIScrollView and also I have to create a marquee with different news and when I click in any of this news, I have to go to the detail of the chosen new.
Please help me

Answer 1

UIControlEventTouchDown should not be the problem, it works too. Can you try the following
label = [UIButton buttonWithType:UIButtonTypeCustom];
instead of
label = [[UIButton alloc] initWithFrame:CGRectZero];
Too I suspect the following line too
label.frame = CGRectMake(xPos, 0.0, width, self.frame.size.height);
the frame you are setting confirm it is correct, in normal usage it may appear that your UIButton is visible, but it may not. Try put
label.clipsToBounds=YES;
and check, if your UIButton is actually visible, that might be the reason your action not working..
UPDATE
Ok, As per my understanding, as you are saying, you are trying to create Marquee, and the original implementation had UILabel and you are trying to change that to UIButton. Let change few things as the code below,
for (NSString *message in self.messages) {
label = [[UILabel alloc] initWithFrame:CGRectZero];
label.text = message;
label.tag = i;
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(gototest:)];
tapGestureRecognizer.numberOfTapsRequired = 1;
[label addGestureRecognizer:tapGestureRecognizer];
label.userInteractionEnabled = YES;
CGSize size = [message sizeWithFont:label.font];
CGFloat width = size.width + kPADDING;
label.frame = CGRectMake(xPos, 0.0, width, self.frame.size.height);
[self addSubview:label];
i++;
xPos += width;
}
And your action
-(void)gototest:(UITapGestureRecognizer*)sender
{
int tag = sender.view.tag;
NSLog(#"test %#",#"ccc ");
}

Answer 2

Use touch event "UIControlEventTouchUpInside" intends of "UIControlEventTouchDown".

Answer 3

It will works fine :
[label addTarget:self action:#selector(grottiest:)
forControlEvents:UIControlEventTouchUpInside];
Edit :
label = [[UIButton alloc] initWithFrame:CGRectMake(xPos, 0.0, 100, 100)];
[label setTitle:message forState:UIControlStateNormal];
//label.titleLabel.text = message;
label.tag = i;
[label addTarget:self action:#selector(gototest:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:label];

Answer 4

Your code is working fine with single button. The problem is somewhere else..
UIButton *label = [[UIButton alloc] initWithFrame:CGRectZero];
[label setTitle:#"Click" forState:UIControlStateNormal];
//label.titleLabel.text = message;
label.tag = 0;
[label addTarget:self action:#selector(gototest:) forControlEvents:UIControlEventTouchDown];
label.frame = CGRectMake(0,0,100,50);
[self addSubview:label];

Answer 5

Replace:
label = [[UIButton alloc] initWithFrame:CGRectZero];
with
UIButton *label = [[UIButton alloc] initWithFrame:CGRectZero];