Snapshot SwiftUI View: remove strange padding on iOS 15

View+Snapshot.swift

//
//  View+Snapshot.swift
//
//  Created by Vinzius on 2021-11-06.
//

import SwiftUI
import UIKit.UIImage
import UIKit.UIGraphicsImageRenderer

extension View {
    
    func snapshot() -> UIImage? {
        
        // Note: since iOS 15 it seems these two modifiers are required.
        let controller = UIHostingController(
            rootView: self.ignoresSafeArea()
                .fixedSize(horizontal: true, vertical: true)
        )
        guard let view = controller.view else { return nil }
        
        let targetSize = view.intrinsicContentSize
        if targetSize.width <= 0 || targetSize.height <= 0 { return nil }
        
        view.bounds = CGRect(origin: .zero, size: targetSize)
        view.backgroundColor = .clear

        let renderer = UIGraphicsImageRenderer(size: targetSize)
        
        return renderer.image { _ in
            view.drawHierarchy(in: controller.view.bounds, afterScreenUpdates: true)
        }
        
    }
    
}