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。
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。
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.
- }
- */
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");
- }
- }
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];
- }
- }];
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:
实现代码如下:
- [[UIApplication sharedApplication] openURL: [NSURL URLWithString: url]]; //url为具体路径
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
来源: http://www.bubuko.com/infodetail-1967061.html