打开/关闭手电筒

1 #import <AVFoundation/AVFoundation.h>

 1 - (IBAction)torchOnTouchButton:(UIButton *)sender{
 2     Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice"); // 设备类
 3     if (captureDeviceClass != nil) {
 4         AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; // 输入
 5         if ([device hasTorch]) { // 判断是否有闪光灯
 6             [device lockForConfiguration:nil]; // 请求独占访问硬件设备
 7             if (sender.tag == 0) {
 8                 sender.tag = 1;
 9                 [device setTorchMode:AVCaptureTorchModeOn]; // 手电筒开
10             }else{
11                 sender.tag = 0;
12                 [device setTorchMode:AVCaptureTorchModeOff]; // 手电筒关
13             }
14             [device unlockForConfiguration]; // 请求解除独占访问硬件设备
15         }
16     }
17 }