iOS点按即可关注 [英] iOS tap to focus
本文介绍了iOS点按即可关注的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我使用此代码在iOS自定义相机应用程序中实现Tap-to-Focus,但它无效。这是代码
I used this code to achieve Tap-to-Focus in iOS custom camera App, but it isn't working. Here's the code
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
let touchPer = touches.anyObject() as UITouch
let screenSize = UIScreen.mainScreen().bounds.size
var focus_x = touchPer.locationInView(self.view).x / screenSize.width
var focus_y = touchPer.locationInView(self.view).y / screenSize.height
if let device = captureDevice {
if(device.lockForConfiguration(nil)) {
device.focusMode = AVCaptureFocusMode.ContinuousAutoFocus
device.focusPointOfInterest = CGPointMake(focus_x, focus_y)
device.exposureMode = AVCaptureExposureMode.ContinuousAutoExposure
device.unlockForConfiguration()
}
}
}
推荐答案
device.focusPointOfInterest = focusPoint
device.focusMode = AVCaptureFocusMode.AutoFocus
device.exposurePointOfInterest = focusPoint
device.exposureMode = AVCaptureExposureMode.ContinuousAutoExposure
我不知道为什么这样做,但确实如此。
I don't why this works, but it did.
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