我期待用滑块选项调暗手电筒的LED.我知道Apple支持iOS 6但是,我不确定要使用哪些代码.这是我目前在.m文件中的代码.
-(IBAction)torchOn:(id)sender;
{
onButton.hidden = YES;
offButton.hidden = NO;
onView.hidden = NO;
offView.hidden = YES;
AVCaptureDevice *flashLight = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if([flashLight isTorchAvailable] && [flashLight isTorchModeSupported:AVCaptureTorchModeOn])
{
BOOL success = [flashLight lockForConfiguration:nil];
if(success)
{
[flashLight setTorchMode:AVCaptureTorchModeOn];
[flashLight unlockForConfiguration];
}
}
}
-(IBAction)torchOff:(id)sender;
{
onButton.hidden = NO;
offButton.hidden = YES;
onView.hidden = YES;
offView.hidden = NO;
AVCaptureDevice *flashLight = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if([flashLight isTorchAvailable] && [flashLight isTorchModeSupported:AVCaptureTorchModeOn])
{
BOOL success = [flashLight lockForConfiguration:nil];
if(success)
{
[flashLight setTorchMode:AVCaptureTorchModeOff];
[flashLight unlockForConfiguration];
}
}
}
解决方法
– (BOOL)setTorchModeOnWithLevel：(float)torchLevel错误：(NSError **)outError
你想要的是什么但是,从我所看到的,它只在某些间隔(~0.2)更新.
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; [device lockForConfiguration:nil]; [device setTorchModeOnWithLevel:slider.value error:NULL]; [device unlockForConfiguration];
编辑 – 完整示例：
这是一个UiSlider.您需要在滑块上添加IBAction插座或以编程方式添加目标(就像我一样)：
UiSlider *slider = [[UiSlider alloc] initWithFrame:CGRectMake(20.0f,20.0f,280.0f,40.0f)]; slider.maximumValue = 1.0f; slider.minimumValue = 0.0f; [slider setContinuous:YES]; [slider addTarget:self action:@selector(sliderDidChange:) forControlEvents:UIControlEventValueChanged]; [self.view addSubview:slider];
然后,响应滑块更改：
- (void)sliderDidChange:(UiSlider *)slider { AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; [device lockForConfiguration:nil]; [device setTorchModeOnWithLevel:slider.value error:NULL]; [device unlockForConfiguration]; }
