我已经创建了一个自定义AVFoundation摄像头并作为子视图加载到另一个视图中使用@IBDesignable,在拍摄图像后我想将其分配给UI
ImageView,但是当按下按钮时,自定义摄像头视图(UIView)崩溃并向上移动在屏幕上,而不是将其分配给UIImageView,这发生在自定义摄像头视图加载开始时,然后当我再次加载自定义摄像头视图时,它会将图像分配给UIImageView.
捕获图像方法：
@IBAction func captureImage(sender: AnyObject) {
if let stillOutput = self.captureImageOutput {
// we do this on another thread so that we don't hang the UI
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0)) {
//find the video connection
var videoConnection : AVCaptureConnection?
for connecton in stillOutput.connections {
//find a matching input port
for port in connecton.inputPorts!{
if port.mediaType == AVMediaTypeVideo {
videoConnection = connecton as? AVCaptureConnection
break //for port
}
}
if videoConnection != nil {
break// for connections
}
}
if videoConnection != nil {
stillOutput.captureStillImageAsynchronouslyFromConnection(videoConnection){
(imageSampleBuffer : CMSampleBuffer!,_) in
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageSampleBuffer)
let pickedImage: UIImage = UIImage(data: imageData,scale: 1.0)!
dispatch_async(dispatch_get_main_queue(),{
self.capturePhoto.image = pickedImage
})
}
}
}
}
}
我也尝试过dispatch_sync并且在UIImageView中没有任何加载,但屏幕不会崩溃.
dispatch_sync(dispatch_get_main_queue(),{
self.capturePhoto.image = pickedImage
})
解决方法
我只是测试了它,这对我有用(Swift 2.0)
override func viewDidLoad() {
super.viewDidLoad()
imageView = UIImageView(frame: self.view.frame)
self.view.addSubview(imageView)
}
func takeImage() {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0)) {
guard let videoConnection = self.stillImageOutput.connectionWithMediaType(AVMediaTypeVideo) else { return }
guard videoConnection.enabled else { return }
self.stillImageOutput.captureStillImageAsynchronouslyFromConnection(videoConnection) { (buffer: CMSampleBuffer!,error: NSError!) -> Void in
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(buffer)
let image: UIImage = UIImage(data: imageData,scale: 1.0)!
dispatch_async(dispatch_get_main_queue(),{
self.imageView.image = image
print("picture taken")
})
}
}
}
图像成功拍摄并添加到ViewController.如果这对您不起作用,也许您可以在设置上解释更多,以便我可以尝试重现错误/崩溃.
