iOS開發(fā)中有時候有這樣的需求：當用戶設(shè)置不允許訪問照片、麥克風和相機等系統(tǒng)權(quán)限的時候，這時需要直接跳轉(zhuǎn)到系統(tǒng)的隱私界面進行設(shè)置。

判斷是否開啟權(quán)限

前面已經(jīng)說過，我們需要在用戶不允許訪問的時候跳轉(zhuǎn)，那么首先我們就要判斷一些是否已經(jīng)開啟系統(tǒng)相機權(quán)限了。

照片權(quán)限檢測

需要：#import <AssetsLibrary/AssetsLibrary.h> //導(dǎo)入此類和AssetsLibrary.framework框架

代碼如下：

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:@"無法使用相冊" message:@"請在iPhone的\"設(shè)置-隱私-照片\"中允許訪問照片。" delegate:self cancelButtonTitle:@"確定" otherButtonTitles:nil]; [alert show]; return;

ALAssetsLibrary類

ALAssetsLibrary類是代表系統(tǒng)中整個資源庫，使用它可以訪問資源庫中的資源和保存照片，視頻等功能。

//判斷當前應(yīng)用是否能訪問相冊資源/*typedef NS_ENUM(NSInteger, ALAuthorizationStatus) {ALAuthorizationStatusNotDetermined = 0, 用戶尚未做出了選擇這個應(yīng)用程序的問候ALAuthorizationStatusRestricted, 此應(yīng)用程序沒有被授權(quán)訪問的照片數(shù)據(jù)。可能是家長控制權(quán)限。 ALAuthorizationStatusDenied, 用戶已經(jīng)明確否認了這一照片數(shù)據(jù)的應(yīng)用程序訪問. ALAuthorizationStatusAuthorized 用戶已授權(quán)應(yīng)用訪問照片數(shù)據(jù). } */

訪問攝像頭

需要：#import <AVFoundation/AVFoundation.h>

代碼如下：

if(isIOS7AndLater) {NSString *mediaType = AVMediaTypeVideo;// Or AVMediaTypeAudioAVAuthorizationStatus 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"); //應(yīng)該是這個，如果不允許的話 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"請在設(shè)備的\"設(shè)置-隱私-相機\"中允許訪問相機。" delegate:self cancelButtonTitle:@"確定" otherButtonTitles:nil]; [alert show]; return; } else if(authStatus == AVAuthorizationStatusAuthorized){//允許訪問 // 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){//點擊允許訪問時調(diào)用 //用戶明確許可與否，媒體需要捕獲，但用戶尚未授予或拒絕許可。 NSLog(@"Granted access to %@", mediaType); } else { NSLog(@"Not granted access to %@", mediaType); } }]; }else { NSLog(@"Unknown authorization status"); } }

麥克風權(quán)限檢測

代碼如下：

//檢測麥克風功能是否打開[[AVAudioSessionsharedInstance]requestRecordPermission:^(BOOL granted) {if (!granted){[ViewUtilalertViewWithString:NSLocalizedString(@"麥克風功能未開啟",nil)]; } else { [selfrecord:sender]; } }];

如何跳轉(zhuǎn)到系統(tǒng)設(shè)置界面

判斷權(quán)限是否設(shè)置之后就可以在相應(yīng)的代理方法進行界面跳轉(zhuǎn)了，那么如何進行跳轉(zhuǎn)呢？

首先要在項目中的info.plist中添加 URL types 并設(shè)置一項URL Schemes為prefs，如下圖：

1.jpg

實現(xiàn)代碼如下：

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:url]];//url為具體路徑

以下是跳轉(zhuǎn)到一些常用界面的代碼

隱私->照片界面

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

隱私->相機界面

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

藍牙設(shè)置界面

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

其他界面參數(shù)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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來源：http://www.jianshu.com/p/1fb3f60b689a ?簡書作者：小球why

轉(zhuǎn)載于:https://www.cnblogs.com/shifu/p/6495087.html

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