iphone相机闪光灯问题

Question

我有一个开关，如果我激活它，我会打开相机闪光灯，如果你关闭，则关闭（默认为关闭）

这是我的代码：

- (void)viewDidAppear:(BOOL)animated

{   

    if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera] == NO)
        return;

    picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;

    picker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType: UIImagePickerControllerCameraCaptureModeVideo];

    picker.allowsEditing = NO;
    picker.showsCameraControls = NO;

    picker.delegate = self;

    [self presentModalViewController:picker animated:YES];  

}

- (IBAction) onChangeSwitch:(id)sender

{

    switch(interruptor.on){
        case YES:
            picker.cameraFlashMode = UIImagePickerControllerCameraFlashModeOn;
            break;
        case NO:
            picker.cameraFlashMode = UIImagePickerControllerCameraFlashModeOff;
            break;
    }
}

在网上看，我看到的代码是简单地转动闪光灯，而不是从 iPhone 相机启动或停止手电筒。

我已经看到它使用 AVCaptureDevice Turn on torch/flash on iPhone # 3367424 我现在不知道如何使它适应我的代码。

有谁知道并帮帮我吗？

谢谢

Answer 1

- (void)flashLightOn {


    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    for (AVCaptureDevice *device in devices) {
        if ([device hasFlash] == YES) {

            [device lockForConfiguration:nil];
            [device setTorchMode:AVCaptureTorchModeOn];
            [device unlockForConfiguration];
        }

    }
}

-(void)flashLightOff {


    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    for (AVCaptureDevice *device in devices) {
        if ([device hasFlash] == YES) {

            [device lockForConfiguration:nil];
            [device setTorchMode:AVCaptureTorchModeOff];
            [device unlockForConfiguration];
        }

    }

}

Answer 2

以下是我打开和关闭灯（又名手电筒）的方法：

- (void) setTorchOn:(BOOL)isOn
{
    AVCaptureDevice* device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    [device lockForConfiguration:nil]; //you must lock before setting torch mode
    [device setTorchMode:isOn ? AVCaptureTorchModeOn : AVCaptureTorchModeOff];
    [device unlockForConfiguration];
}

我很确定您需要链接到 AVFoundation 框架。