iOS 判断应用是否有使用相机的权限

NSString *mediaType = AVMediaTypeVideo;
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
if(authStatus == ALAuthorizationStatusRestricted || authStatus == ALAuthorizationStatusDenied){

NSLog(@"相机权限受限");
return;
}
-------
全部状态

typedef NS_ENUM(NSInteger, ALAuthorizationStatus) {
ALAuthorizationStatusNotDetermined = 0, // User has not yet made a choice with regards to this application
ALAuthorizationStatusRestricted, // This application is not authorized to access photo data.
// The user cannot change this application’s status, possibly due to active restrictions
// such as parental controls being in place.
ALAuthorizationStatusDenied, // User has explicitly denied this application access to photos data.
ALAuthorizationStatusAuthorized // User has authorized this application to access photos data.
} __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_6_0);

注意：要添加 AVFoundation 库。