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Take capture a view by SwiftUI
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// | |
// ContentView.swift | |
// TryGeometryReader | |
// | |
// Created by satoutakeshi on 2019/12/07. | |
// Copyright © 2019 satoutakeshi. All rights reserved. | |
// | |
import SwiftUI | |
struct ContentView: View { | |
var body: some View { | |
ScrollView { | |
VStack { | |
Text("GeometryReader Get Grobal Origin") | |
GeometryRectangle(color: Color.pink) | |
GeometryRectangle(color: Color.red) | |
.offset(x: 10, y: 0) | |
ZStack { | |
GeometryRectangle(color: Color.blue) | |
.offset(x: 30, y: 0) | |
} | |
} | |
} | |
} | |
} | |
struct GeometryRectangle: View { | |
var color: Color | |
var body: some View { | |
GeometryReader { geometry in | |
VStack { | |
Button(action: { | |
let image = self.takeScreenshot(origin: geometry.frame(in: .global).origin, size: geometry.size) | |
print(image) | |
}) { | |
RoundedRectangle(cornerRadius: 20) | |
.fill(self.color) | |
.overlay( | |
VStack { | |
Text("X: \(Int(geometry.frame(in: .global).origin.x)) Y: \(Int(geometry.frame(in: .global).origin.y)) width: \(Int(geometry.frame(in: .global).width)) height: \(Int(geometry.frame(in: .global).height))") | |
.foregroundColor(.white) | |
Text("size: \(geometry.size.debugDescription)") | |
.foregroundColor(.white) | |
})} | |
} | |
}.frame(height: 100) | |
} | |
} | |
struct ContentView_Previews: PreviewProvider { | |
static var previews: some View { | |
ContentView() | |
} | |
} | |
extension UIView { | |
var renderedImage: UIImage { | |
// rect of capure | |
let rect = self.bounds | |
// create the context of bitmap | |
UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0) | |
let context: CGContext = UIGraphicsGetCurrentContext()! | |
self.layer.render(in: context) | |
// get a image from current context bitmap | |
let capturedImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()! | |
UIGraphicsEndImageContext() | |
return capturedImage | |
} | |
} | |
extension View { | |
func takeScreenshot(origin: CGPoint, size: CGSize) -> UIImage { | |
let window = UIWindow(frame: CGRect(origin: origin, size: size)) | |
let hosting = UIHostingController(rootView: self) | |
hosting.view.frame = window.frame | |
window.addSubview(hosting.view) | |
window.makeKeyAndVisible() | |
return hosting.view.renderedImage | |
} | |
} |
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