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UISearchBarの変なアニメーションを直す

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UISearchBarにあらかじめtextをセットしておいて表示したあと、clearボタンを押した時のplaceholderの表示のされ方が気持ち悪かったので修正した方法。

before

class ViewController: UIViewController {
    var searchBar: UISearchBar = {
        let searchBar = UISearchBar()
        searchBar.placeholder = "プレースホルダー"
        searchBar.text = "hogehoge"
        return searchBar
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(searchBar)
    }
}

左上から出てきてしまう。
placeholderのframeが{0,0,0,0}から虫眼鏡の左側に移動しているためこのようなアニメーションになってしまう。
before.gif
※わかりにくいのでスローアニメーションにしています。

after

class ViewController: UIViewController {
    var searchBar: UISearchBar = {
        let searchBar = UISearchBar()
        searchBar.placeholder = "プレースホルダー"

        // 文言をセットする前にこれを呼ぶ
        // これによりplaceholderの表示位置をあらかじめ通常の状態にする
        searchBar.layoutIfNeeded()

        searchBar.text = "hogehoge"
        return searchBar
    }()
}

若干左上から表示されるが最初よりはだいぶマシになった。
after.gif

furuyan
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