iOS 系统设置隐私中常用的功能权限获取

#####1.相册权限

ALAuthorizationStatus authStatus = [ALAssetsLibrary authorizationStatus];

根据apple的sdk ALAuthorizationStatus 拥有以下状态

typedef NS_ENUM(NSInteger, ALAuthorizationStatus) {
ALAuthorizationStatusNotDetermined NS_ENUM_DEPRECATED_IOS(6_0, 9_0) = 0, // 用户还没有选择权限
ALAuthorizationStatusRestricted NS_ENUM_DEPRECATED_IOS(6_0, 9_0),        // 应用未被授权 用户不能更改该应用程序的状态,可能由于活跃的限制/ /如家长控制到位。
ALAuthorizationStatusDenied NS_ENUM_DEPRECATED_IOS(6_0, 9_0),            //用户拒绝应用访问
ALAuthorizationStatusAuthorized NS_ENUM_DEPRECATED_IOS(6_0, 9_0)        // 用户允许应用访问
}

ALAuthorizationStatus authStatus = [ALAssetsLibrary authorizationStatus];
if (authStatus == ALAuthorizationStatusDenied || authStatus == ALAuthorizationStatusRestricted) {
    if (IS_IOS8_OR_HIGHER && [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]]) {
        failedHandle(true);
        return;
    }
    else {
        failedHandle(false);
        return;
    }
}
succeedHandler();

iOS8 以后可以通过

PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];

PHAuthorizationStatus的权限值同上相似，这边就不写了，可查看具体的apple 的sdk

#####2.相机权限

AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];

对应的权限枚举，解析如相册权限。

typedef NS_ENUM(NSInteger, AVAuthorizationStatus) {
AVAuthorizationStatusNotDetermined = 0,
AVAuthorizationStatusRestricted,
AVAuthorizationStatusDenied,
AVAuthorizationStatusAuthorized
}

if (authStatus == AVAuthorizationStatusDenied || authStatus == AVAuthorizationStatusRestricted) {
    if (IS_IOS8_OR_HIGHER && [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]]) {
        failedHandle (true);
    }
    else {
        failedHandle (false);
    }
}
else if(authStatus == AVAuthorizationStatusAuthorized)
{
    succeedHandler();
}
else if (authStatus == ALAuthorizationStatusNotDetermined){
    [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
        dispatch_async(dispatch_get_main_queue(), ^{
            if(granted){
                succeedHandler();
            }
            else {
                if (IS_IOS8_OR_HIGHER && [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]]) {
                    failedHandle (true);
                }
                else {
                    failedHandle (false);
                }
            }
            
        });
        
    }];
}

#####3.麦克风权限
AVAudioSession 这是个很重要的类 有关音频视频等都会用到它，而且也不是很容易理清楚的，这边就不详说这个类的用处了。

[[AVAudioSession sharedInstance] requestRecordPermission:^(BOOL granted) {
dispatch_async(dispatch_get_main_queue(), ^{
if (granted) {

succeedHandler();
}
else {
if (IS_IOS8_OR_HIGHER && [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]]) {
failedHandle(true);
}
else {
failedHandle(false);
}
}
});
}];

(AVAudioSessionRecordPermission)recordPermission NS_AVAILABLE_IOS(8_0)
这是iOS8 以后开始支持的方法，使用也非常方便简单。
下面说下这个属性的含义：获取当前应用录音权限

typedef NS_OPTIONS(NSUInteger, AVAudioSessionRecordPermission)
{
AVAudioSessionRecordPermissionUndetermined = 'undt’,// 未获取权限

AVAudioSessionRecordPermissionDenied = 'deny’,//拒绝授权

AVAudioSessionRecordPermissionGranted = ‘grant’//同意授权
}

#####4.定位权限
iOS8以后定位的获取方法有些变动，但也是简单的
[CLLocationManager locationServicesEnabled] 是否启用定位服务
[CLLocationManager authorizationStatus] 获取当前定位的权限值

typedef NS_ENUM(int, CLAuthorizationStatus) {
    // 用户尚未选择关于这个应用程序
    
    kCLAuthorizationStatusNotDetermined = 0,
    //这个应用程序未被授权使用定位服务
    kCLAuthorizationStatusRestricted,
    // 用户已经明确拒绝授权对于这个应用程序，或在设置里拒绝该应用使用
    kCLAuthorizationStatusDenied,
    //用户已获得授权使用他们的位置在任何时候
    kCLAuthorizationStatusAuthorizedAlways NS_ENUM_AVAILABLE(NA, 8_0),
    //在使用应用程序的时候授权使用 在前台
    kCLAuthorizationStatusAuthorizedWhenInUse NS_ENUM_AVAILABLE(NA, 8_0),
    // 这个值是弃用,但相当于 kCLAuthorizationStatusAuthorizedAlways。
    kCLAuthorizationStatusAuthorized NS_ENUM_DEPRECATED(10_6, NA, 2_0, 8_0)
};

if (IS_IOS8_OR_HIGHER) {
    if ([CLLocationManager locationServicesEnabled] && [CLLocationManager authorizationStatus] != kCLAuthorizationStatusDenied && [CLLocationManager authorizationStatus] != kCLAuthorizationStatusRestricted) {
        succeedHandler();
    }
    else
    {
        if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]]) {
            
            failedHandle(true);
        }
        else {
            failedHandle(false);
        }
    }
}
else
{
    if ([CLLocationManager locationServicesEnabled]&& ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorized || [CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined)) {
        succeedHandler();
    }
    else
    {
        failedHandle(false);
    }
}

#####5.通讯录权限
通讯录的权限获取 iOS8又是个分界点，这里就直接上获取权限的代码了。

if (IS_IOS8_OR_HIGHER)
{
    if (&ABAddressBookRequestAccessWithCompletion != NULL)
    {
        ABAddressBookRequestAccessWithCompletion(self.addressBook, ^(bool granted, CFErrorRef error)
                                                 {
                                                     if (granted) {
                                                         succeedHandler();
                                                     }
                                                     else
                                                     {
                                                         if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]])
                                                         {
                                                             failedHandle(true);
                                                         }
                                                         else {
                                                             failedHandle(false);
                                                         }
                                                     }
                                                 });
    }
}
else
{
    if (&ABAddressBookRequestAccessWithCompletion != NULL)
    {
        ABAddressBookRequestAccessWithCompletion(self.addressBook, ^(bool granted, CFErrorRef error)
                                                 {
                                                     if (granted) {
                                                         succeedHandler();
                                                     }
                                                     else
                                                     {
                                                         failedHandle(false);
                                                     }
                                                 });
    }
}

5.通知权限
[[UIApplication sharedApplication] isRegisteredForRemoteNotifications]// 系统设置总开关
[[UIApplication sharedApplication] currentUserNotificationSettings].types//通知下的各个权限子开关

typedef NS_OPTIONS(NSUInteger, UIUserNotificationType) {
UIUserNotificationTypeNone    = 0,      // the application may not present any UI upon a notification being received
UIUserNotificationTypeBadge   = 1 << 0, // the application may badge its icon upon a notification being received
UIUserNotificationTypeSound   = 1 << 1, // the application may play a sound upon a notification being received
UIUserNotificationTypeAlert   = 1 << 2, // the application may display an alert upon a notification being received
}

BOOL pushEnabled;
// 设置里的通知总开关是否打开
BOOL settingEnabled = [[UIApplication sharedApplication] isRegisteredForRemoteNotifications];
// 设置里的通知各子项是否都打开
BOOL subsettingEnabled = [[UIApplication sharedApplication] currentUserNotificationSettings].types != UIUserNotificationTypeNone;
pushEnabled = settingEnabled && subsettingEnabled;
if (pushEnabled) {
    succeedHandler();
}
else
{
    if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]])
    {
        failedHandle(true);
    }
    else {
        failedHandle(false);
    }
}

总结：通过各个功能权限的获取，发现apple对用户隐私越来越重视。方法也更完善，iOS8 是一个重要的临界点，开发可以考虑从iOS8开始支持，如

[[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];

这句话的作用是判断能否打开设置里该应用的隐私设置，应用直接跳转到设置里 会使用户的体验更好。
[在github上有我对这些的封装使用]
https://github.com/weskhen/PaoBa/tree/master/SystemPermission