打开手电筒照明的思路：初始化相机设备 -> 点击按钮 -> 改变照明状态 -> 根据状态打开或关闭手电筒
#import "ViewController.h" #import <AVFoundation/AVFoundation.h> @interface ViewController () @property (nonatomic, strong) AVCaptureDevice *device;//捕获设备 @end @implementation ViewController { BOOL device_open;//判断照明状态 UIButton *scanBtn; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. //创建按钮 [self creatControl]; } - (void)creatControl { //初始化相机设备 self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; //照明按钮 scanBtn = [UIButton buttonWithType:UIButtonTypeSystem]; scanBtn.frame = CGRectMake(100, 100, 100, 44); [scanBtn setTitle:@"打开照明" forState:UIControlStateNormal]; [scanBtn addTarget:self action:@selector(scanBtnOnClick) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:scanBtn]; } -(void)scanBtnOnClick { NSLog(@"%@",device_open?@"YES":@"NO"); //改变状态 device_open = !device_open; //判断设备是否有闪关灯 if (![self.device hasTorch]) { UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"当前设备没有闪关灯，无法开启照明功能" preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { }]; UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) { }]; [alert addAction:sureAction]; [alert addAction:cancelAction]; [self presentViewController:alert animated:YES completion:nil]; } [self.device lockForConfiguration:nil]; //根据状态，打开或关闭照明 if (device_open) { [self.device setTorchMode:AVCaptureTorchModeOn]; [scanBtn setTitle:@"关闭照明" forState:UIControlStateNormal]; } else { [self.device setTorchMode:AVCaptureTorchModeOff]; [scanBtn setTitle:@"打开照明" forState:UIControlStateNormal]; } } @end原文链接:https://blog.csdn.net/qq_36557133/article/details/81626395
