我正在开发一个用于分割的相机应用程序，我设法捕获了现场照片，以缩略图的形式显示在UIImageView中。 现在我想让它在3秒内消失，如果用户没有触摸（像IOS相机在拍照时的行为）。 你能帮我如何实现吗？ 请看下面我的代码的相关部分。 事先多谢。
// MARK: -- Action to Capture Photo
extension ViewController {
@IBAction func photoButtonAction(sender: UIButton) {
CameraManager.shared.capture { [weak self] (pixelBuffer, sampleBuffer) in
self?.handleCameraOutput(pixelBuffer: pixelBuffer, sampleBuffer: sampleBuffer, onFinish: { (image) in
self?.imagePreview.image = image
let pngData = image!.pngData()
let compressedData = UIImage(data: pngData!)
self!.writeToPhotoAlbum(image: compressedData!)
})
}
}
func writeToPhotoAlbum(image: UIImage) {
UIImageWriteToSavedPhotosAlbum(image, self, #selector(saveError), nil)
}
@objc func saveError(_ image: UIImage, didFinishSavingWithError error: Error?, contextInfo: UnsafeRawPointer) {
}
}
您可以使用DispatchQueue.main.AsyncAfter(deadline:）方法，如下所示:
var noUserInteractionOnImage = true // toggle this if user interacts with image
@IBAction func photoButtonAction(sender: UIButton) {
CameraManager.shared.capture { [weak self] (pixelBuffer, sampleBuffer) in
self?.handleCameraOutput(pixelBuffer: pixelBuffer, sampleBuffer: sampleBuffer, onFinish: { (image) in
//...
DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
if self?.noUserInteractionOnImage == true {
self?.imagePreview.image = nil
}
}
})
}
}
