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コードによるimageの切り替え

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flagを立ててimageの切り替えを制御

ViewController.swift
var flg = false


@IBAction func button(_ sender: Any) {      
  if flg {
            flg = false
            //画像なし
            self.button.setImage(nil, for: .normal)
        } else {
            button.setImage(pause, for: UIControl.State())
            flg = true
        }
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