Prevent dropDown from opening when some pre condition not satisfy on dropDown.listWillAppear ?

[iAj43]

Hello guys, I want to track initial tap when any user taps on dropdown to check initially some condition & if condition satisfy then and then only user can tap on drop down otherwise some related user friendly message I will show.

Currently there is only post selection i.e. (dropDown.didSelection) method available but I want method when user taps initially to check some pre condition.

    lazy var departmentDropDown: DropDown = {
        
        let dd = DropDown()
        dd.translatesAutoresizingMaskIntoConstraints = false
        dd.placeholder = "Select Department"
        dd.textColor = .darkGray
        dd.font = UIFont.systemFont(ofSize: 16, weight: .medium)
        // dd.addTarget(self, action: #selector(handleDepartmentDropDown), for: .touchUpInside) // want to track below func
        return dd
    }()
    
    @objc func handleDepartmentDropDown() {
        print(123)
    }

[jriosdev]

available Closures

listWillAppear() { //You can Do anything when iOS DropDown willAppear }

listDidAppear() { //You can Do anything when iOS DropDown listDidAppear }

listWillDisappear() { //You can Do anything when iOS DropDown listWillDisappear }

listDidDisappear() { //You can Do anything when iOS DropDown listDidDisappear }

[iAj43]

Thanks @jriosdev , I was forget that.

[jriosdev]

give one star to iOSDropDown If you like :)

[iAj43]

Yes sure @jriosdev, also have one question that have you fully check from memory leaks and some related optimisation factors?

[iAj43]

@jriosdev can you please guide how can I prevent dropDown form opening when some condition not satisfies on willAppear?

[jriosdev]

Hidelist in the dropdown

On Thu, 22 Aug 2019 at 6:00 PM Irfan Ajmeri [email protected] wrote:

Reopened #50 https://github.com/jriosdev/iOSDropDown/issues/50.

— You are receiving this because you were mentioned.

Reply to this email directly, view it on GitHub https://github.com/jriosdev/iOSDropDown/issues/50?email_source=notifications&email_token=AJI3B66CSMNJBIKNBES7JNDQF2BGPA5CNFSM4IOT56L2YY3PNVWWK3TUL52HS4DFWZEXG43VMVCXMZLOORHG65DJMZUWGYLUNFXW5KTDN5WW2ZLOORPWSZGOTGHTFRA#event-2576298692, or mute the thread https://github.com/notifications/unsubscribe-auth/AJI3B653BBWUWRSI224ZUC3QF2BGPANCNFSM4IOT56LQ .

[iAj43]

Hidelist in the dropdown … On Thu, 22 Aug 2019 at 6:00 PM Irfan Ajmeri @.***> wrote: Reopened #50 <#50>. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#50?email_source=notifications&email_token=AJI3B66CSMNJBIKNBES7JNDQF2BGPA5CNFSM4IOT56L2YY3PNVWWK3TUL52HS4DFWZEXG43VMVCXMZLOORHG65DJMZUWGYLUNFXW5KTDN5WW2ZLOORPWSZGOTGHTFRA#event-2576298692>, or mute the thread https://github.com/notifications/unsubscribe-auth/AJI3B653BBWUWRSI224ZUC3QF2BGPANCNFSM4IOT56LQ .

It causes crash when I will try to do dropDown.hideList() Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value

public func hideList() {
        
        TableWillDisappearCompletion()
        UIView.animate(withDuration: 0.75,
                       delay: 0.25,
                       usingSpringWithDamping: 0.5,
                       initialSpringVelocity: 0,
                       options: .curveLinear,
                       animations: { () -> Void in
                        self.table.frame = CGRect(x: self.pointToParent.x,
                                                  y: self.pointToParent.y+self.frame.height,
                                                  width: self.frame.width,
                                                  height: 0)
                        self.shadow.alpha = 0
                        self.shadow.frame = self.table.frame
                        self.arrow.position = .down
        },
                       completion: { (didFinish) -> Void in

                        self.shadow.removeFromSuperview()
                        self.table.removeFromSuperview()
                        self.backgroundView.removeFromSuperview()
                        self.isSelected = false
                        self.TableDidDisappearCompletion()
        })
    }

[iAj43]

@jriosdev kindly guide how can I prevent to opening dropDown if some condition not satisfies with steps or code snippet?