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[英]capture image from iphone camera or get it from library, How to get the image capture time?
[英]How to time camera flash with image capture?
我想這樣做,以使我的閃光燈在拍攝照片時會與時間同步,但不確定如何拍攝。 我嘗試過使用NSTimer和NSSleep以及其他方式對其進行計時,但是由於有時相機對焦和拍照所需的時間比其他時間更長,因此它並不總是能使閃光燈完全正確。 我將如何完成?
這是我做閃光燈的方法...
func toggleFlash() {
let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
if (device.hasTorch) {
device.lockForConfiguration(nil)
if (device.torchMode == AVCaptureTorchMode.On) {
device.torchMode = AVCaptureTorchMode.Off
} else {
device.setTorchModeOnWithLevel(1.0, error: nil)
}
device.unlockForConfiguration()
}
}
這就是我的拍照方式...
func didPressTakePhoto(){
if let videoConnection = stillImageOutput?.connectionWithMediaType(AVMediaTypeVideo){
videoConnection.videoOrientation = AVCaptureVideoOrientation.Portrait
stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: {
(sampleBuffer, error) in
if sampleBuffer != nil {
var imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
var dataProvider = CGDataProviderCreateWithCFData(imageData)
var cgImageRef = CGImageCreateWithJPEGDataProvider(dataProvider, nil, true, kCGRenderingIntentDefault)
var image:UIImage!
if self.camera == true {
image = UIImage(CGImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.Right)
} else {
image = UIImage(CGImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.LeftMirrored)
}
self.tempImageView.image = image
self.tempImageView.hidden = false
}
})
}
}
在toggleFlash
,您需要設置
device.flashMode = .On
您正在設置torchMode
。
糾正此問題應使flash在captureStillImageAsynchronouslyFromConnection
期間的正確時間熄滅。
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