调用系统手电筒只需15行demo搞定

• 导入#import 框架

- (IBAction)FlashlightClick:(UIButton *)sender {
    sender.selected = !sender.isSelected;
    Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");
    if (captureDeviceClass != nil) {
        AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
        if ([device hasTorch] && [device hasFlash]) {
            [device lockForConfiguration:nil];
            if (sender.isSelected) {
                [device setTorchMode:AVCaptureTorchModeOn];
                [device setFlashMode:AVCaptureFlashModeOn];
            }else {
                [device setTorchMode:AVCaptureTorchModeOff];
                [device setFlashMode:AVCaptureFlashModeOff];
            }
            [device unlockForConfiguration];
        }
    }
}

附上demo:
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