Hide an imageview by clicking it? - ios

Question

When tapping a specific button in my app I want an image to show, I did this using an UIImageView. Then I want to hide that image by tapping it, but I don't understand how to do this?
I tried the following code, but it doesn't work.
#implementation ViewController
-(IBAction)pic {
UIImage *img = [UIImage imageNamed:#"test.png"];
[ImageView setImage:img];
imageView.userInteractionEnabled = YES;
UITapGestureRecognizer *tapRecognize = [[UITapGestureRecognizer alloc]
initWithTarget:self action:#selector(handleTap:)];
tapRecognizer.delegate = self;
[imageView addGestureRecognizer:tapRecognizer];
}
- (void)handleTap:(UITapGestureRecognizer *)tapGestureRecognizer {
//handle tap
}

Answer 1

Its pretty simple.
Use an UIImageView instead and check that userInteractionEnabled is YES on the UIImageView. Then you can then add a gesture recognizer.
Your .h file should have atleast something like below:
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController<UIGestureRecognizerDelegate>
#property (weak, nonatomic) IBOutlet UIImageView *touchImageView;
#end
Dont forget to connect UIImageView from your storyboard to property declared above.
in your .m file:
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.touchImageView.userInteractionEnabled = YES;
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc]
initWithTarget:self action:#selector(handleTap:)];
tapRecognizer.delegate = self;
[self.touchImageView addGestureRecognizer:tapRecognizer];
}
- (void)handleTap:(UITapGestureRecognizer *)tapGestureRecognizer {
//handle tap
self.touchImageView.alpha = 0.0f;
}

Answer 2

You could put an image on a button instead. I think using a UIImageView is the right decision though. You need to hook up a gesture to it programmatically. You can do this using something similar to below:
let singleFingerTap = UITapGestureRecognizer(target: self, action: "viewTapped:")
imageView.addGestureRecognizer(singleFingerTap)

Answer 3

You can add a tap gesture recognizer to the UIImageView that contains the image.
var tapGesture = UITapGestureRecognizer(target: <#AnyObject#>, action: <#Selector#>)
In the method you assign as the action, just set myImageView.alpha = 0. This should essentially "hide" your image view. You could also set the height of the image view to 0 if you wanted to hide it in that sense.

Answer 4

An alternative could be to import an open-sourced project, such as the AKImageViewer, to get posts to appear full screen (giving the user a better full view) and allowing them to swipe or cancel to get away from the image (similar to viewing images in the Twitter app.