• 判断设备是否允许访问相机
  "#import <AVFoundation/AVCaptureDevice.h>"
  "#import <AVFoundation/AVMediaFormat.h>"

 AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    if (authStatus == AVAuthorizationStatusRestricted || authStatus ==AVAuthorizationStatusDenied)
    {
//请设置允许相机
}

设备是否开启定位

http://blog.csdn.net/mideveloper/article/details/46444195

CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
 if (kCLAuthorizationStatusDenied == status || kCLAuthorizationStatusRestricted == status) {
      //请设置允许获取定位
  }

• 判断用户是否有权限访问相册

"#import <AssetsLibrary/AssetsLibrary.h>"

ALAuthorizationStatus author = [ALAssetsLibraryauthorizationStatus];  
    if (author == kCLAuthorizationStatusRestricted || author ==kCLAuthorizationStatusDenied){  
        //无权限  
    }  
    typedef enum {  
        kCLAuthorizationStatusNotDetermined = 0, // 用户尚未做出选择这个应用程序的问候  
        kCLAuthorizationStatusRestricted,        // 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  
        kCLAuthorizationStatusDenied,            // 用户已经明确否认了这一照片数据的应用程序访问  
        kCLAuthorizationStatusAuthorized         // 用户已经授权应用访问照片数据} CLAuthorizationStatus;  
    }