用swift 写的相机手动对焦
//对焦十字
focalView=UIView(frame: CGRectMake(10, 50, 200, 200))
focalView.backgroundColor = UIColor.clearColor()
self.overlayView.addSubview(focalView)
//十字
let line1 = UIView(frame:CGRectMake(0, 29.5, 60, 1))
line1.backgroundColor = UIColor.whiteColor()
focalView.addSubview(line1)
let line2 = UIView(frame:CGRectMake(29.5, 0, 1, 60))
line2.backgroundColor = UIColor.whiteColor()
focalView.addSubview(line2)
//默认隐藏
focalView.hidden=true;
//点击屏幕对焦的手势
let tapGesture = UITapGestureRecognizer(target: self, action: "handleTapGesture:")
[imagePickerController!.cameraOverlayView? .bringSubviewToFront(self.overlayView)];
self.overlayView.addGestureRecognizer(tapGesture)
}
func threadInMainMethod(sender : AnyObject)
{
GPSLabel.text="GPS精度:中精度"
directionPrecisionLabel.text = "方向精度:中精度"
let appdelegate = UIApplication.sharedApplication().delegate as! AppDelegate
latitudeLabel.text = NSString(format: "纬度:%f" , appdelegate.starpoint.x) as String
longitudeLabel.text = NSString(format: "经度:%f" , appdelegate.starpoint.y) as String
let receiver = VideoReceiver.getInstance()
let wrapper = receiver.rotationWrapper
let yaw = wrapper.yaw
let roll = wrapper.roll
let degree = (yaw - roll + 360)%360
let direction = parseDirection(degree)
directionLabel.text = NSString(format: "方向:%@" , direction) as String
}
func handleTapGesture(sender: UITapGestureRecognizer){
let location:CGPoint! = sender.locationInView(self.overlayView)
focusOnPoint(location, completionHandler: {
self.focalView.center = location
self.focalView.alpha = 0.0
self.focalView.hidden = false
UIView.animateWithDuration(1, animations: {
self.focalView.alpha = 1.0
}, completion: { (finished) in
self.focalView.alpha = 0.0
})
})
}
func focusOnPoint(_point: CGPoint, completionHandler: (Void) -> Void) {
let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
var pointOfInterest = CGPoint.zero
let frameSize = self.overlayView.bounds.size
pointOfInterest = CGPoint(x: _point.y / frameSize.height, y: 1 - (_point.x / frameSize.width))
if device?.focusPointOfInterestSupported == true && device?.isFocusModeSupported(.AutoFocus) == true {
do {
try device?.lockForConfiguration()
if device?.isWhiteBalanceModeSupported(.ContinuousAutoWhiteBalance) == true {
device?.whiteBalanceMode = .ContinuousAutoWhiteBalance
}
if device?.isFocusModeSupported(.ContinuousAutoFocus) == true {
device?.focusMode = .ContinuousAutoFocus
device?.focusPointOfInterest = pointOfInterest
}
if device?.exposurePointOfInterestSupported == true && device?.isExposureModeSupported(.ContinuousAutoExposure) == true {
device?.exposurePointOfInterest = pointOfInterest
device?.exposureMode = .ContinuousAutoExposure
}
device?.unlockForConfiguration()
completionHandler()
} catch {
}
} else {
completionHandler()
}
}
