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  • iOS 之访问权限以及跳转到系统界面

    iOS开发中有时候有这样的需求:当用户设置不允许访问照片、麦克风和相机等系统权限的时候,这时需要直接跳转到系统的隐私界面进行设置。

    判断是否开启权限

    前面已经说过,我们需要在用户不允许访问的时候跳转,那么首先我们就要判断一些是否已经开启系统相机权限了。

    照片权限检测

    需要:#import <AssetsLibrary/AssetsLibrary.h> //导入此类和AssetsLibrary.framework框架

    代码如下:

    int author = [ALAssetsLibrary authorizationStatus];
                NSLog(@"author type:%d",author);
                if(author == ALAuthorizationStatusRestricted || author == ALAuthorizationStatusDenied) {
                    // The user has explicitly denied permission for media capture.
                    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"无法使用相册"
                                                                    message:@"请在iPhone的"设置-隐私-照片"中允许访问照片。"
                                                                   delegate:self
                                                          cancelButtonTitle:@"确定"
                                                          otherButtonTitles:nil];
                    [alert show];
                    return;

    ALAssetsLibrary类

    ALAssetsLibrary类是代表系统中整个资源库,使用它可以访问资源库中的资源和保存照片,视频等功能。

      //判断当前应用是否能访问相册资源
        /*
         typedef NS_ENUM(NSInteger, ALAuthorizationStatus) {
         ALAuthorizationStatusNotDetermined = 0, 用户尚未做出了选择这个应用程序的问候
         ALAuthorizationStatusRestricted,        此应用程序没有被授权访问的照片数据。可能是家长控制权限。
         ALAuthorizationStatusDenied,            用户已经明确否认了这一照片数据的应用程序访问.
         ALAuthorizationStatusAuthorized         用户已授权应用访问照片数据.
         }
         */

    访问摄像头

    需要:#import <AVFoundation/AVFoundation.h>

    代码如下:

    if(isIOS7AndLater) {
    
    NSString *mediaType = AVMediaTypeVideo;// Or AVMediaTypeAudio
            AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
            NSLog(@"---cui--authStatus--------%d",authStatus);
            // This status is normally not visible—the AVCaptureDevice class methods for discovering devices do not return devices the user is restricted from accessing.
            if(authStatus ==AVAuthorizationStatusRestricted){
                NSLog(@"Restricted");
            }else if(authStatus == AVAuthorizationStatusDenied){
                // The user has explicitly denied permission for media capture.
                NSLog(@"Denied");     //应该是这个,如果不允许的话
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示"
                                                                message:@"请在设备的"设置-隐私-相机"中允许访问相机。"
                                                               delegate:self
                                                      cancelButtonTitle:@"确定"
                                                      otherButtonTitles:nil];
                [alert show];
                return;
            }
            else if(authStatus == AVAuthorizationStatusAuthorized){//允许访问
                // The user has explicitly granted permission for media capture, or explicit user permission is not necessary for the media type in question.
                NSLog(@"Authorized");
                
            }else if(authStatus == AVAuthorizationStatusNotDetermined){
                // Explicit user permission is required for media capture, but the user has not yet granted or denied such permission.
                [AVCaptureDevice requestAccessForMediaType:mediaType completionHandler:^(BOOL granted) {
                    if(granted){//点击允许访问时调用
                        //用户明确许可与否,媒体需要捕获,但用户尚未授予或拒绝许可。
                        NSLog(@"Granted access to %@", mediaType);
                    }
                    else {
                        NSLog(@"Not granted access to %@", mediaType);
                    }
                    
                }];
            }else {
                NSLog(@"Unknown authorization status");
            }
    }

    麦克风权限检测

    代码如下:

     //检测麦克风功能是否打开
        [[AVAudioSessionsharedInstance]requestRecordPermission:^(BOOL granted) {
            if (!granted)
            {
                [ViewUtilalertViewWithString:NSLocalizedString(@"麦克风功能未开启",nil)];
            }
            else
            {
                
                [selfrecord:sender];
            }
        }];

    如何跳转到系统设置界面

    判断权限是否设置之后就可以在相应的代理方法进行界面跳转了,那么如何进行跳转呢?

    首先要在项目中的info.plist中添加 URL types 并设置一项URL Schemes为prefs,如下图:

     
    1.jpg

    实现代码如下:

    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:url]];//url为具体路径

    以下是跳转到一些常用界面的代码

    隐私->照片界面

    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=Privacy&path=PHOTOS"]];

    隐私->相机界面

    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=Privacy&path=CAMERA"]];

    蓝牙设置界面

    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=Bluetooth"]];

    其他界面参数配置

    About — prefs:root=General&path=About

    Accessibility — prefs:root=General&path=ACCESSIBILITY

    Airplane Mode On — prefs:root=AIRPLANE_MODE

    Auto-Lock — prefs:root=General&path=AUTOLOCK

    Brightness — prefs:root=Brightness

    Bluetooth — prefs:root=General&path=Bluetooth

    Date & Time — prefs:root=General&path=DATE_AND_TIME

    FaceTime — prefs:root=FACETIME

    General — prefs:root=General

    Keyboard — prefs:root=General&path=Keyboard

    iCloud — prefs:root=CASTLE

    iCloud Storage & Backup — prefs:root=CASTLE&path=STORAGE_AND_BACKUP

    International — prefs:root=General&path=INTERNATIONAL

    Location Services — prefs:root=LOCATION_SERVICES

    Music — prefs:root=MUSIC

    Music Equalizer — prefs:root=MUSIC&path=EQ

    Music Volume Limit — prefs:root=MUSIC&path=VolumeLimit

    Network — prefs:root=General&path=Network

    Nike + iPod — prefs:root=NIKE_PLUS_IPOD

    Notes — prefs:root=NOTES

    Notification — prefs:root=NOTIFICATIONS_ID

    Phone — prefs:root=Phone

    Photos — prefs:root=Photos

    Profile — prefs:root=General&path=ManagedConfigurationList

    Reset — prefs:root=General&path=Reset

    Safari — prefs:root=Safari

    Siri — prefs:root=General&path=Assistant

    Sounds — prefs:root=Sounds

    Software Update — prefs:root=General&path=SOFTWARE_UPDATE_LINK

    Store — prefs:root=STORE

    Twitter — prefs:root=TWITTER

    Usage — prefs:root=General&path=USAGE

    VPN — prefs:root=General&path=Network/VPN

    Wallpaper — prefs:root=Wallpaper

    Wi-Fi — prefs:root=WIFI



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  • 原文地址:https://www.cnblogs.com/gaozhang12345/p/10818546.html
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