ios 状态栏后面的离子离子视图标题

Swift
import UIKit
class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let emitterLayer = CAEmitterLayer()
        emitterLayer.emitterPosition = CGPoint(x: view.bounds.width / 2, y: -20)
        emitterLayer.emitterShape = .line
        emitterLayer.emitterSize = CGSize(width: view.bounds.width, height: 1)
        
        let cell = CAEmitterCell()
        cell.contents = UIImage(named: "particle")?.cgImage
        cell.birthRate = 5
        cell.lifetime = 3
        cell.velocity = 100
        cell.velocityRange = 50
        cell.emissionLongitude = .pi
        cell.emissionRange = .pi / 4
        
        emitterLayer.emitterCells = [cell]
        view.layer.addSublayer(emitterLayer)
    }
}