iOS相机、麦克风等权限的判断与设置

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一、iOS应用权限检测

在涉及到这个问题的时候，首先为了适配iOS10系统，我们必须首先在info.plist文件中声明将要用到的权限，否则将会引起崩溃如下：
“This app has crashed because it attempted to access privacy-sensitive data without a usage description. The app’s Info.plist must contain an NSMicrophoneUsageDescription key with a string value explaining to the user how the app uses this data.”
那么设置权限声明的的方式如下：
屏幕快照 2017-01-09 下午7.52.07.png
我们需要点击Info.plist中加号，增加需要授权key值并填写相应的权限使用声明。

1.相机与麦克风

检测相机与麦克风权限需要导入AVFoundataion框架

#import <AVFoundation/AVFoundation.h>

 /**//相机、麦克风的授权状态typedef NS_ENUM(NSInteger, AVAuthorizationStatus) {AVAuthorizationStatusNotDetermined = 0,//未询问过用户是否授权AVAuthorizationStatusRestricted, //未授权，例如家长控制AVAuthorizationStatusDenied, //未授权，用户曾选择过拒绝授权AVAuthorizationStatusAuthorized //已经授权} NS_AVAILABLE_IOS(7_0) __TVOS_PROHIBITED;*/

/** 检测相机的方法 @param permissionGranted 相机授权成功执行的方法 @param noPermission 相机授权失败或者未授权执行的方法 */+ (void)checkCameraAuthorizationGrand:(void (^)())permissionGranted withNoPermission:(void (^)())noPermission{    AVAuthorizationStatus videoAuthStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];    switch (videoAuthStatus) {        case AVAuthorizationStatusNotDetermined:        {            //第一次提示用户授权            [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {                granted ? permissionGranted() : noPermission();            }];            break;        }        case AVAuthorizationStatusAuthorized:        {            //通过授权            permissionGranted();            break;        }        case AVAuthorizationStatusRestricted:            //不能授权            NSLog(@"不能完成授权，可能开启了访问限制");        case AVAuthorizationStatusDenied:{            //提示跳转到相机设置(这里使用了blockits的弹窗方法）            UIAlertView *alert = [UIAlertView  bk_showAlertViewWithTitle:@"相机授权" message:@"跳转相机授权设置" cancelButtonTitle:@"取消" otherButtonTitles:@[@"设置"] handler:^(UIAlertView *alertView, NSInteger buttonIndex) {                if (buttonIndex == 1) {                    //请求授权                    [self requetSettingForVideo];                 }             }];            [alert show];        }            break;        default:            break;    }}

2.相册

这里针对于iOS8及其以后的系统相册检测方法，使用到的PHPhotoLibrary需要导入Photos框架。

#import <Photos/Photos.h>

//相册的授权状态typedef NS_ENUM(NSInteger, PHAuthorizationStatus) {    PHAuthorizationStatusNotDetermined = 0, // User has not yet made a choice with regards to this application    PHAuthorizationStatusRestricted,        // This application is not authorized to access photo data.                                            // The user cannot change this application’s status, possibly due to active restrictions                                            //   such as parental controls being in place.    PHAuthorizationStatusDenied,            // User has explicitly denied this application access to photos data.    PHAuthorizationStatusAuthorized         // User has authorized this application to access photos data.} PHOTOS_AVAILABLE_IOS_TVOS(8_0, 10_0);

/** 检测访问相册的权限 这里的方法适用于iOS8及其以后版本 @param permissionGranted 相册授权成功执行的方法 @param noPermission 相册授权失败或者未授权执行的方法 */+ (void)checkPhotoAlbumAuthorizationGrand:(void (^)())permissionGranted withNoPermission:(void (^)())noPermission{    PHAuthorizationStatus photoAuthStatus = [PHPhotoLibrary authorizationStatus];    switch (photoAuthStatus) {        case PHAuthorizationStatusNotDetermined:        {            //第一次提示用户授权            [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {                status == PHAuthorizationStatusAuthorized ? permissionGranted() : noPermission();            }];            break;        }        case PHAuthorizationStatusAuthorized:        {            //已经通过授权            permissionGranted();            break;        }        case PHAuthorizationStatusRestricted:            //不能授权            NSLog(@"不能完成授权，可能开启了访问限制");        case PHAuthorizationStatusDenied:{            //提示跳转相册授权设置            UIAlertView *alert = [UIAlertView  bk_showAlertViewWithTitle:@"相册授权" message:@"跳转相册授权设置" cancelButtonTitle:@"取消" otherButtonTitles:@[@"设置"] handler:^(UIAlertView *alertView, NSInteger buttonIndex) {                if (buttonIndex == 1) {                    [self requetSettingForPhotoAlbum];                }            }];            [alert show];            break;        }        default:            break;    }}

二、iOS应用跳转权限设置

在iOS8以后的系统中，跳转设置使用如下方法：

+ (void)requetSettingForAuth{    NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];    if ([ [UIApplication sharedApplication] canOpenURL:url])    {           [[UIApplication sharedApplication] openURL:url];    }}

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