Created
November 7, 2019 03:07
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import UIKit | |
extension UIScrollView { | |
struct DefaultProperty { | |
let contentOffset: CGPoint | |
let contentSize: CGSize | |
let contentInset: UIEdgeInsets | |
let zoomScale: CGFloat | |
} | |
func snapshot(scale: CGFloat = 0.0, completionBlock: @escaping (UIImage?) -> Void) { | |
let frame = self.frame | |
let defaultProperty = DefaultProperty(contentOffset: contentOffset, | |
contentSize: contentSize, | |
contentInset: contentInset, | |
zoomScale: zoomScale) | |
let contentInsetAdjustmentBehavior: Any? | |
if #available(iOS 11.0, *) { | |
contentInsetAdjustmentBehavior = self.contentInsetAdjustmentBehavior | |
} else { | |
contentInsetAdjustmentBehavior = nil | |
} | |
let completion: () -> () = { | |
self.zoomScale = defaultProperty.zoomScale | |
self.contentInset = defaultProperty.contentInset | |
self.contentSize = defaultProperty.contentSize | |
self.contentOffset = defaultProperty.contentOffset | |
if #available(iOS 11.0, *), let contentInsetAdjustmentBehavior = contentInsetAdjustmentBehavior as? UIScrollView.ContentInsetAdjustmentBehavior { | |
self.contentInsetAdjustmentBehavior = contentInsetAdjustmentBehavior | |
} | |
completionBlock(UIGraphicsGetImageFromCurrentImageContext()) | |
UIGraphicsEndImageContext() | |
} | |
if #available(iOS 11.0, *) { | |
self.contentInsetAdjustmentBehavior = .never | |
} | |
self.contentInset = .zero | |
self.setContentOffset(.zero, animated: false) | |
self.zoomScale = 1.0 | |
let contentSize = contentSize | |
UIGraphicsBeginImageContextWithOptions(contentSize, false, scale) | |
let duration = 0.3 | |
DispatchQueue.main.asyncAfter(deadline: .now() + duration) { | |
let cols = ceil(contentSize.width / frame.size.width) | |
let rows = ceil(contentSize.height / frame.size.height) | |
guard let context = UIGraphicsGetCurrentContext() else { | |
completion() | |
return | |
} | |
var numberOfLoops = 0 | |
for c in stride(from: 0.0, to: cols, by: 1.0) { | |
for r in stride(from: 0.0, to: rows, by: 1.0) { | |
let offset = CGPoint(x: c * frame.size.width, y: r * frame.size.height) | |
self.setContentOffset(offset, animated: false) | |
RunLoop.main.run(until: Date(timeIntervalSinceNow: duration)) | |
context.move(to: offset) | |
self.drawHierarchy(in: self.bounds, afterScreenUpdates: true) | |
numberOfLoops += 1 | |
} | |
} | |
completion() | |
} | |
} | |
} |
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