how to change UI Button shape programmatically? - ios

Question

I have a button that contains a finger print image like the picture above. that fingerPrint button has a function to segue to viewController2. that fingerPrint button exists on the viewController1.
when the viewController1 is opened for the first time, I will get a data from the server, if I don't have that data, I shouldn't segue to viewController2 .
but sometimes we have an error as the response of my request. if I get the error response, then I want that finger button to be rectangular button that has 'Refresh' as the title and has different function to make request again to the server
how to achieve change the shape of existing UI Button?
class ViewController1 : UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
getDataFromServer()
}
#IBAction func fingerPrintButtonDidPressed(_ sender: Any) {
}
func getDataFromServer() {
// send request to get data from server
}
}

Answer 1

It is usually best to do it either all in code or all in storyboard. To do it in storyboard I suggest one of the following:
Create 2 buttons and in code hide one or another depending on your state
Assign different images and texts for different button states (there is a dropdown in interface builder) and then change the state of a button in runtime
To do it in code overall I suggest simply changing the values.
Assume you have something like this:
enum ViewState {
case idle
case success
case failed
}
var state: ViewState = .idle {
didSet {
refreshButton()
}
}
Now you can set your state when you get a response or on any event needed. All you need to implement is refreshButton.
func refreshButton() {
switch state {
case .idle:
button.setTitle(nil, for: .normal)
button.setImage(fingerprintImage, for: .normal)
button.backgroundColor = .clear
case .success:
button.setTitle(nil, for: .normal)
button.setImage(fingerprintImage, for: .normal)
button.backgroundColor = .clear
case .failed:
button.setTitle("REFRESH", for: .normal)
button.setImage(nil, for: .normal)
button.backgroundColor = .green
}
}
You can then use the same switch inside your button action (on press).

Answer 2

if isError
{
button.type = .system
button.backgroundColor - UIColor.green
button.setTitle("REFRESH" for: .normal)
button.addTarget(--------)
}
else
{
button.type = .custom
button.setImage(UIImage(named: "yourImageName.png") for: .normal)
button.addTarget(--------)
}

Answer 3

Simple Solution is : Use two buttons one for figure Image second for Refresh text. And use button isHidden property vice-versa.
For Auto layout
If you are using Auto layout then use constraint IBOutlet and change it's constant property value. it will change your button height or width.
For Auto resize
if you are using Auto resize than you can change you button frame which you want