iOS手电筒功能开发

前言

AVCaptureDevice(捕捉设备类)可以完成手机手电筒功能的开发，它属于AVFoundation框架。开发也比较简单，我这里简单地介绍一下。

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OC中的代码示例

导入框架

#import <AVFoundation/AVFoundation.h>

定义属性

@property(nonatomic,strong)AVCaptureDevice *device;
@property(nonatomic,assign)BOOL available;

初始化捕捉设备对象

//初始化捕捉设备对象
self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

手电筒功能是否可用

 //获取是否可用手电筒功能
 self.available = self.device.hasTorch;
//提示
if (!self.available) {
    UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"提示" message:@"设备不可用" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
    [alertView show];
}

打开手电筒

 if (self.available) {
    [self.device lockForConfiguration:nil];
    // AVCaptureTorchModeOn:开 AVCaptureTorchModeOff:关 AVCaptureTorchModeAuto:自动
    self.device.torchMode = AVCaptureTorchModeOn;
    [self.device unlockForConfiguration];
}

关闭手电筒

 if (self.available) {
    [self.device lockForConfiguration:nil];
    // AVCaptureTorchModeOn:开 AVCaptureTorchModeOff:关 AVCaptureTorchModeAuto:自动
    self.device.torchMode = AVCaptureTorchModeOff;
    [self.device unlockForConfiguration];
}

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Switf中的代码示例(跟OC同理)

导入框架

import AVFoundation

定议成属性并懒加载捕捉设备对象

var isflashlight = false
lazy var device:AVCaptureDevice? = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)

手电筒功能是否可用

 //MARK: -- 是否支持手电筒功能
func supportFlashlight(){
    isflashlight = device?.hasTorch ?? false
    if !isflashlight {
    let alert =  UIAlertView(title: "提示", message: "设备不支持", delegate: nil, cancelButtonTitle: "确定")
    alert.show()
    }  
}

打开或者关闭手电筒

//MARK: -- true:为打开，false:为关闭

func flashlight(_ sure : Bool ) {
    if sure {
        //打开
        do {
            try device!.lockForConfiguration()
            device!.torchMode = AVCaptureTorchMode.on
            device!.unlockForConfiguration()
         } catch  {

          }

    }else{
        //关闭
         do {
            try device!.lockForConfiguration()
            device!.torchMode = AVCaptureTorchMode.off
            device!.unlockForConfiguration()
         } catch  {

          }

     }
}

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总结

是不是特别简单啊？如果有什么疑问可以Q我:342112780