ios访问相册,摄像头等权限

.判断用户是否有权限访问相册
需要引用 AssetsLibrary.framework 库

#import <AssetsLibrary/AssetsLibrary.h>
        ALAuthorizationStatus author = [ALAssetsLibrary authorizationStatus];
        if (author == AVAuthorizationStatusRestricted || author == AVAuthorizationStatusDenied){
        
            //无权限
            NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
            // app名称
            NSString *app_Name = [infoDictionary objectForKey:@"CFBundleDisplayName"];
            NSString *tips = [NSString stringWithFormat:@"请在”设置-隐私-照片“选项中，允许%@访问你的照片",app_Name];
            UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"提示" message:tips delegate:nil cancelButtonTitle:@"关闭" otherButtonTitles:nil, nil];
            [alert show];
            return;
        }

    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;
    }

2.判断用户是否有权限访问相机
iOS7之前都可以访问相机，iOS7之后访问相机有权限设置
需要导入 AVFoundation.framework 库
#include <AVFoundation/AVFoundation.h>
     NSString *mediaType = AVMediaTypeVideo;
    AVAuthorizationStatus authStatus = [AVCaptureDeviceauthorizationStatusForMediaType:mediaType];
    if(authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied){
        //无权限
        NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
        // app名称
        NSString *app_Name = [infoDictionary objectForKey:@"CFBundleDisplayName"];
        NSString *tips = [NSString stringWithFormat:@"请在”设置-隐私-相机“选项中，允许%@访问你的手机相机",app_Name];
        UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"提示" message:tips delegate:nil cancelButtonTitle:@"关闭" otherButtonTitles:nil, nil];
        [alert show];
        return;
    }