Find the Name of a Background Image of a Button in Swift

Question

I have named a set of images like this:

Unselected:

nameOfTheImage

Selected:

nameOfTheImage~

In order to change the background image of a button, my code is written to take the string of the background image's name, and either append or take off the "~" to change it to the correct image.

So I tried this:

let backgroundString = String(selector.currentBackgroundImage!)
print(backgroundString)

But I get this:

<UIImage: 0x146d98b80>, {485, 300}

Is there any way to get the plain name of the background image?

Any help is greatly appreciated.

Answer 1

i had a similar problem. Fortunately I know the state of the button when the viewcontroller is displayed, so I created a String control, which was something like this:

var buttonState = "not selected" 

then when the user clicks on the button I check:

if (buttonState == "not selected") {

   // change buttonState to "selected"

   // change the image of the button

}

Answer 2

I just dealt with a somewhat similar problem. You can use: buttonName.setBackgroundImage(#imageLiteral(resourceName: "backgroundImageName"), for: .normal) Where here .normal is the state of the button, so you can adjust your state accordingly.

For anyone else who might be having this problem, this is for Swift5.

Answer 3

I was able to retrieve the button's background image name by doing the following:

let imgDesc : String = button.currentBackgroundImage!.description

The above string (imgDesc) always contains something similar to the following:

<UIImage:0x281646400 named(main: userBike) {40, 63}>

Using prefix I drop everything after the close parenthesis in a new string variable:

var imgName = imgDesc.prefix { $0 != ")" } //always contains only one close parenthesis

Using range I retrieve the index of where "(main: " is located within my imgName variable:

let index = imgName.range(of: "(main: ")?.upperBound //always contains open parenthesis followed by main:<space>

Using the index from above I drop everything before it:

imgName = imgName.suffix(from: index!)

This ultimately isolates the image name from button.currentBackgroundImage.description:

print(imgName) //prints userBike

Prints "userBike" which is the image name successfully isolated from imgDesc.