LimitedWKWebView

import WebKit

final class LimitedWKWebView: WKWebView {
    // storyboard
    required init?(coder: NSCoder) {
        super.init(coder: coder)

        // 選択をさせない
        navigationDelegate = self
        self.scrollView.delegate = self
        // 平行のインジケーター出さない
        self.scrollView.showsHorizontalScrollIndicator = false
    }

    override func target(
        forAction action: Selector,
        withSender sender: Any?
    ) -> Any? {
        return nil
    }

    override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
        return false
    }
}

extension LimitedWKWebView: WKNavigationDelegate {
    // https://stackoverflow.com/questions/48467723/how-to-disable-user-selection-in-a-wkwebview-in-swift
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        let javascriptStyle = "var css = '*{-webkit-touch-callout:none;-webkit-user-select:none}'; var head = document.head || document.getElementsByTagName('head')[0]; var style = document.createElement('style'); style.type = 'text/css'; style.appendChild(document.createTextNode(css)); head.appendChild(style);"
        webView.evaluateJavaScript(javascriptStyle, completionHandler: nil)
    }
}

extension LimitedWKWebView: UIScrollViewDelegate {
    // Zoomいらない
    func scrollViewWillBeginZooming(_ scrollView: UIScrollView, with view: UIView?) {
         scrollView.pinchGestureRecognizer?.isEnabled = false
    }

    // 横スクロールいらない
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        if (scrollView.contentOffset.x > 0){
            scrollView.contentOffset = CGPoint(x: 0, y: scrollView.contentOffset.y)
        }
     }
}

Swift collection viewの仕組み

future-architect.github.io

Swiftでstaticなメンバ

Access static variables within class in Swift - Stack Overflow

短く　Self.MyConst

BinanceからBNBを送信

↓

↓

混乱するBoolのoptional

混乱するので

struct Klass {
    var a: Bool? = nil
    var b: Bool? = nil
}

let klass: Klass? = Klass(a: false, b: nil)
let hoge = 3

if klass?.a == false {
    print("aはfalse")
}

if hoge == 3 && klass?.a == false {
    print("aはfalse")
}


if klass?.b == false {
    print("bはfalse")
}

if hoge == 3 && klass?.b == false {
    print("bはfalse")
}

結果は。

aはfalse
aはfalse

paiza.io