iOS 判断是否有权限访问手机，相册

#import <AssetsLibrary/AssetsLibrary.h>
ALAuthorizationStatus author =[ALAssetsLibrary authorizationStatus];
if (author == kCLAuthorizationStatusRestricted || author ==kCLAuthorizationStatusDenied)
{
       //无权限
}

可以注意一下下面这个

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;

iOS 8 之后推荐用 #import <Photos/Photos.h> 中的判断

PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusRestricted ||
    status == PHAuthorizationStatusDenied) {
    return NO;
}
return YES;

typedef NS_ENUM(NSInteger, PHAuthorizationStatus) {
    PHAuthorizationStatusNotDetermined = 0, // 默认还没做出选择
    PHAuthorizationStatusRestricted,        // 此应用程序没有被授权访问的照片数据
    PHAuthorizationStatusDenied,            // 用户已经明确否认了这一照片数据的应用程序访问
    PHAuthorizationStatusAuthorized         //  用户已经授权应用访问照片数据
} NS_AVAILABLE_IOS(8_0);

- (BOOL)isCanUsePhotos {
    if ([[[UIDevice currentDevice] systemVersion] floatValue] < 8.0) {
        ALAuthorizationStatus author =[ALAssetsLibrary authorizationStatus];
        if (author == kCLAuthorizationStatusRestricted || author == kCLAuthorizationStatusDenied) {
            //无权限
            return NO;
        }
    }
    else {
        PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
        if (status == PHAuthorizationStatusRestricted ||
            status == PHAuthorizationStatusDenied) {
            //无权限
            return NO;
        }
    }
    return YES;
}

但实际上系统会提醒以下一张图，可以不做判断的，哈哈哈

英语环境下的没有权限

iOS7之前都可以访问相机强制进入相机 相册 ios强制进入相机 相册 ios，iOS7之后访问相机有权限修改，所以而是应该我们自动去修改判定。

  #import <AVFoundation/AVCaptureDevice.h>
  #import <AVFoundation/AVMediaFormat.h>
  AVAuthorizationStatus authStatus =  [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
  if (authStatus == AVAuthorizationStatusRestricted || authStatus ==AVAuthorizationStatusDenied)
  {
        //无权限
  }

typedef NS_ENUM(NSInteger, AVAuthorizationStatus) {
        AVAuthorizationStatusNotDetermined = 0,// 系统还未知是否访问，第一次开启相机时
        AVAuthorizationStatusRestricted, // 受限制的
        AVAuthorizationStatusDenied, //不允许
        AVAuthorizationStatusAuthorized // 允许状态
} NS_AVAILABLE_IOS(7_0) __TVOS_PROHIBITED;

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