iOS权限问题

NSString *mediaType = AVMediaTypeVideo;
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
if(authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied){
//相机权限受限制
}

typedef NS_ENUM(NSInteger, AVAuthorizationStatus) {
AVAuthorizationStatusNotDetermined = 0,    请问是否授权访问
AVAuthorizationStatusRestricted,     权限都限制
AVAuthorizationStatusDenied,    拒绝访问
AVAuthorizationStatusAuthorized     授权访问
} NS_AVAILABLE_IOS(7_0) __TVOS_PROHIBITED;

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0){
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusDenied || status == PHAuthorizationStatusRestricted) {
//相册权限受限制
}
}
else{
ALAuthorizationStatus status = [ALAssetsLibrary authorizationStatus];
if (status == ALAuthorizationStatusDenied || status == ALAuthorizationStatusRestricted) {
//相册权限受限制
}
}

ALAuthorizationStatus 在iOS9之后废弃了，PHAuthorizationStatus 是ios8新增的替代 ALAuthorizationStatus 的方法。

typedef NS_ENUM(NSInteger, PHAuthorizationStatus) {
PHAuthorizationStatusNotDetermined = 0,
PHAuthorizationStatusRestricted,
PHAuthorizationStatusDenied,
PHAuthorizationStatusAuthorized
} NS_AVAILABLE_IOS(8_0);

typedef NS_ENUM(NSInteger, ALAuthorizationStatus) {
ALAuthorizationStatusNotDetermined
ALAuthorizationStatusRestricted
ALAuthorizationStatusDenied
ALAuthorizationStatusAuthorized
} NS_DEPRECATED_IOS(6_0, 9_0, "Use PHAuthorizationStatus in the Photos framework instead");