目录
前言
AVCaptureDevice 类可以让开发者修改摄像头的闪关灯&手电筒模式。设备后面的LED灯当拍摄静态图片时作为闪光灯，而当拍摄视频时用作连续灯光（手电筒）。捕捉设备的flashMode和 touchMode 属性可以被设置为以下3个值中的一个：
AVCapture(Torch/Flash)ModeOn: 闪关灯/手电筒总是开启
AVCapture(Torch/Flash)ModeOff:闪关灯/手电筒总是关闭
AVCapture(Torch/Flash)ModeAuto:系统会基于周围关照环境情况自动关闭或打开LED
方法实现
//判断是否有闪光灯
- (BOOL)cameraHasFlash {
return [[self activeCamera]hasFlash];
}
//闪光灯模式
- (AVCaptureFlashMode)flashMode {
return [[self activeCamera]flashMode];
}
//设置闪光灯
- (void)setFlashMode:(AVCaptureFlashMode)flashMode {
//获取会话
AVCaptureDevice *device = [self activeCamera];
//判断是否支持闪光灯模式
if ([device isFlashModeSupported:flashMode]) {
//如果支持，则锁定设备
NSError *error;
if ([device lockForConfiguration:&error]) {
//修改闪光灯模式
device.flashMode = flashMode;
//修改完成，解锁释放设备
[device unlockForConfiguration];
}else
{
[self.delegate deviceConfigurationFailedWithError:error];
}
}
}
//是否支持手电筒
- (BOOL)cameraHasTorch {
return [[self activeCamera]hasTorch];
}
//手电筒模式
- (AVCaptureTorchMode)torchMode {
return [[self activeCamera]torchMode];
}
//设置是否打开手电筒
- (void)setTorchMode:(AVCaptureTorchMode)torchMode {
AVCaptureDevice *device = [self activeCamera];
if ([device isTorchModeSupported:torchMode]) {
NSError *error;
if ([device lockForConfiguration:&error]) {
device.torchMode = torchMode;
[device unlockForConfiguration];
}else
{
[self.delegate deviceConfigurationFailedWithError:error];
}
}
}
行者常至，为者常成！