因?yàn)橄鄼C(jī)是相冊(cè)是日常開發(fā)中必不可少的功能，但是因?yàn)樘O果的隱私政策，每次訪問的時(shí)候都需要授權(quán)，沒有授權(quán)app是無法訪問相冊(cè)和相機(jī)功能的，這樣會(huì)造成app在用戶第一次使用的時(shí)候出現(xiàn)一下顯示不正常或者沒有響應(yīng)的感覺。
為了能提高用戶的體驗(yàn)度，寫一下相機(jī)相冊(cè)簡(jiǎn)單的權(quán)限邏輯判斷。
1、相冊(cè)權(quán)限：
蘋果文檔中，相冊(cè)權(quán)限狀態(tài)有一下情況：
iOS 8.0+

API_AVAILABLE_BEGIN(macos(10.13), ios(8), tvos(10))
typedef NS_ENUM(NSInteger, PHAuthorizationStatus) {
    PHAuthorizationStatusNotDetermined = 0, // 用戶沒有選擇User has not yet made a choice with regards to this application 
    PHAuthorizationStatusRestricted,        // 已拒絕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.
    PHAuthorizationStatusDenied,            // 已拒絕User has explicitly denied this application access to photos data. 
    PHAuthorizationStatusAuthorized         //已同意授權(quán) User has authorized this application to access photos data.  
};

通過一下方法判斷是否繼續(xù)下一步
需要導(dǎo)入#import <Photos/Photos.h>

PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
 if (status == PHAuthorizationStatusRestricted ||
                status == PHAuthorizationStatusDenied) 
{
                //無權(quán)限
          [SVProgressHUD showErrorWithStatus:@"Please set the Allow APP to access your photo album. Settings > Privacy > Album"];
   return ;
}
//第一次進(jìn)來還沒有選擇是否授權(quán)
else if (status == PHAuthorizationStatusNotDetermined)
 {
                [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
                    dispatch_async(dispatch_get_main_queue(), ^{
                        if (status == PHAuthorizationStatusRestricted || status == PHAuthorizationStatusDenied)
                        {
                            // 用戶拒絕，跳轉(zhuǎn)到自定義提示頁面
                            
                        }
                        else if (status == PHAuthorizationStatusAuthorized)
                        {
                            // 用戶授權(quán)，彈出相冊(cè)對(duì)話框
                            
                        }
                    });
                }];
                return;
}
else{
    // 用戶授權(quán)，彈出相冊(cè)對(duì)話框
}

2、相機(jī)
同相冊(cè)一樣，相機(jī)也是有對(duì)應(yīng)的權(quán)限狀態(tài)

typedef NS_ENUM(NSInteger, AVAuthorizationStatus) {
    AVAuthorizationStatusNotDetermined = 0,//沒有選擇
    AVAuthorizationStatusRestricted    = 1,//已拒絕
    AVAuthorizationStatusDenied        = 2,//已拒絕
    AVAuthorizationStatusAuthorized    = 3,//已授權(quán)
} API_AVAILABLE(macos(10.14), ios(7.0)) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;

導(dǎo)入#import <AVFoundation/AVCaptureDevice.h>

AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
            if (authStatus == AVAuthorizationStatusRestricted || authStatus ==AVAuthorizationStatusDenied) {
                //無權(quán)限 
                
                return ;
            }
            else if (authStatus == AVAuthorizationStatusNotDetermined)
            {
                [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
                    if (!granted) {//不允許
                        
                    }else{//開啟
                        
                    }
                }];
                return;
            }
else
{
  //已授權(quán)
}

獲取麥克風(fēng)權(quán)限邏輯和相機(jī)是差不多的只需把AVMediaTypeVideo 替換成AVMediaTypeAudio就可以了。
這就是目前相機(jī)、相冊(cè)和麥克風(fēng)的權(quán)限邏輯了，需要注意的一點(diǎn)是，這些方法大多是異步的，所以如果要在返回后做對(duì)應(yīng)的操作，最好切換到主線程。