If you are using IB, you can set the highlighted state of the image.
Go to the attributes inspector, its the 4th option on the right pane. Set the 'highlighted' drop down to myImage.png after copying the image into resources folder in your project.
Also, make sure the checkbox for Interaction is enabled (to user interaction enabled).
Now, add a tap gesture recognizer from the Objects menu in the bottom. Add it to the UIImageView you want. Connect the selector of the tap gesture recognizer (from the last option in the right pane or by right clicking on the tap gesture recognizer) to an IBAction to handle the tap gesture recognizer.
In that action, you can do whatever you want. Like setting a clear button etc.
You can set the imageview to highlighted using this..
self.myImageView.highlighted = YES;