iOS之访问权限以及跳转到系统界面 iOS之访问权限以及跳转到系统

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//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
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：

文章图片

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
//

@"prefs:root=NOTIFICATIONS_ID&path=应用的boundleId"

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

文／小球hy（简书作者）
原文链接：http://www.jianshu.com/p/1fb3f60b689a
著作权归作者所有，转载请联系作者获得授权，并标注“简书作者”。 【iOS之访问权限以及跳转到系统界面】转载于:https://www.cnblogs.com/fakeCoder/p/6007017.html