UIVut里面的UIButton不可点击

Question

I'm a little stuck on this one, I have a UIButton inside a UIViewController , but for some reason the UIButton is not responding.

_downloadButton = [[DownloadButtonViewController alloc] init];
_downloadButton.issue = _issue;
_downloadButton.view.frame = CGRectMake(self.descriptionLabel.frame.origin.x, self.descriptionLabel.frame.origin.y + self.descriptionLabel.frame.size.height + 20, 200, 27);
[self.view addSubview:_downloadButton.view];

UIButton *tmpButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
tmpButton.titleLabel.text = @"test";
tmpButton.frame = CGRectMake(_downloadButton.view.frame.origin.x, _downloadButton.view.frame.origin.y - 30, _downloadButton.view.frame.size.width, _downloadButton.view.frame.size.height);
[self.view addSubview:tmpButton];

To see if nothing was overlapping it, I added another UIButton a little lower, even if I add it on the same position it still works.

The structure of my application is like this

- UIViewController
    - UIScrollView
        - ThumbCover
            - UIImageView
            - DownloadButton --> NOT WORKING
            - UIButton --> WORKING
            - UILabel
        - ThumbCover
            - UIImageView
            - DownloadButton --> NOT WORKING
            - UIButton --> WORKING
            - UILabel
        - ThumbCover
            - UIImageView
            - DownloadButton --> NOT WORKING
            - UIButton --> WORKING
            - UILabel
        - ThumbCover
            - UIImageView
            - DownloadButton --> NOT WORKING
            - UIButton --> WORKING
            - UILabel

The DownloadButton is just a simple UIButton , nothing special at all.

Answer 1

You have specified the height of the viewcontroller's view as 27

_downloadButton.view.frame = CGRectMake(self.descriptionLabel.frame.origin.x, self.descriptionLabel.frame.origin.y + self.descriptionLabel.frame.size.height + 20, 200, 27);

If your button's frame is outside the frame of its parent view (viewcontroller's view), the abovesaid frame, it wouldn't respond to your touches

Answer 2

Did you actually set some target for the button? (Asking since in the provided code, I cannot see that!) Otherwise, it would not response at all of course.

Answer 3

i put your code but change two line which overrite so just try this code...

_downloadButton = [[DownloadButtonViewController alloc] init];
_downloadButton.issue = _issue;
_downloadButton.view.frame = CGRectMake(self.descriptionLabel.frame.origin.x, self.descriptionLabel.frame.origin.y + self.descriptionLabel.frame.size.height + 20, 200, 27);

UIButton *tmpButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
tmpButton.titleLabel.text = @"test";
tmpButton.frame = CGRectMake(_downloadButton.view.frame.origin.x, _downloadButton.view.frame.origin.y - 30, _downloadButton.view.frame.size.width, _downloadButton.view.frame.size.height);
[self.view addSubview:tmpButton];
[self.view addSubview:_downloadButton.view];

hope this help you...

:)

Answer 4

In my case, it seems like my animated transitioning is not yet completed. I forgot to to put completeTransition:Bool at the end of my animateTransition:context method making all the buttons inside my view controller disabled and not userinteractionEnabled .

Answer 5

Looking at you this code

_downloadButton = [[DownloadButtonViewController alloc] init];

Not that i mean your naming way is wrong but I doubt if your DownloadButtonViewController is UIButton or not. Just to make sure open your DownloadButtonViewController.h and check if you have got this or not

@interface DownloadButtonViewController : UIButton

Answer 6

replace this line.. 

tmpButton.titleLabel.text = @"test";

as

[tmpButton setTitle: @"test" forState:UIControlStateNormal];