小编Mar*_*ñuk的帖子

我有一些在PHP中运行正常的代码.从postgres CLI我发出一个

NOTIFY job;

Postgres正确引发了通知(我可以在PHP客户端中看到它),但无法在节点中读取它.

JS:

var pg = require('pg');
var conString = "your postgres information";
var client = new pg.Client(conString);

client.connect();
client.query('LISTEN job');
client.on('notification', function(msg) {
    console.log('data');
});

我宁愿保持简单.就是让像Postgres的一个过程的唯一途径这个？

我正在尝试使用 UIViewRepresentable 实现延迟加载 MyLazyHStack 视图，但它不会延迟加载元素。我在 MyLazyHStack 的内容中使用 LazyHStack，但所有元素都是立即加载，而不是根据需要延迟加载。这是我的代码的一个最小示例。有人可以帮我弄清楚我做错了什么吗？

struct MyLazyHStack<Content: View>: UIViewRepresentable {
    var content: Content
    
    func makeUIView(context: Context) -> UIView {
        let scrollView = UIScrollView()
        scrollView.isPagingEnabled = true
        
        let hostingController = UIHostingController(rootView: content)
        hostingController.view.translatesAutoresizingMaskIntoConstraints = false
        
        scrollView.addSubview(hostingController.view)
        
        NSLayoutConstraint.activate([
            hostingController.view.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor),
            hostingController.view.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor),
            hostingController.view.topAnchor.constraint(equalTo: scrollView.topAnchor),
            hostingController.view.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor),
            hostingController.view.heightAnchor.constraint(equalTo: scrollView.heightAnchor)
        ])
        
        return scrollView
    }
    
    func updateUIView(_ uiView: UIView, context: Context) {}
}

struct ContentView: View {
    var body: some View {
        MyLazyHStack {
            LazyHStack {
                ForEach(1..<100) { index in
                    Text("Element \(index)") …