如何打开iPhone的闪光灯1秒？

#import <AVFoundation/AVFoundation.h>

- (void)turnOnFlashlightForOneSecond {
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
    if ([device hasTorch] && [device isTorchAvailable]) {
        [device lockForConfiguration:nil];
        [device setTorchMode:AVCaptureTorchModeOn];
        [device unlockForConfiguration];
        
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [device lockForConfiguration:nil];
            [device setTorchMode:AVCaptureTorchModeOff];
            [device unlockForConfiguration];
        });
    }
}