title: ios-獲取相簿相機圖片
categories: Ios
tags: [ios, 相簿, 相機]
date: 2021-02-11 16:29:28
comments: false
mathjax: true
toc: true

ios-獲取相簿相機圖片

前篇

• 隱私資訊 info.plist 配置: https://stackoverflow.com/questions/39465687/nscamerausagedescription-in-ios-10-0-runtime-crash
• iOS關於相機相簿許可權設定 - https://www.jianshu.com/p/84df2ca84ade
• iOS 獲取圖片（拍照、相簿、相簿）詳解 - https://www.jianshu.com/p/39a6a104d3c1
• iOS 拍照(相機)/相簿獲取圖片 - https://www.jianshu.com/p/5465e87d8a0a
• iOS關於相機相簿許可權設定 - https://www.jianshu.com/p/84df2ca84ade
• iOS開發：呼叫系統自帶相機以及獲取相簿照片的功能實現 - https://www.cnblogs.com/sundaysgarden/articles/9188975.html

獲取相簿圖片

1. 在 info.plist 中配置相簿許可權提示:

   Key    :  Privacy - Photo Library Usage Description    
   Value  :  $(PRODUCT_NAME) photo use
   

2. 實現 <UIKit/UIKit.h> 中 UIImagePickerControllerDelegate 代理介面

   // 當用戶選取完成後呼叫；
   - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { ... }
   // 當用戶取消選取時呼叫；
   - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { ... }
   

3. 獲取相簿

   #import <Photos/Photos.h>
   
   // 檢查相簿是否可用
   +(BOOL)checkGallery{
       PHAuthorizationStatus authStatus = [PHPhotoLibrary authorizationStatus];
       if (authStatus == PHAuthorizationStatusRestricted || authStatus == PHAuthorizationStatusDenied) {
           return NO;
       }
       return YES;
   }
   
   // 獲取相簿
   -(void)getGallery:(CPicture*)data cb:(CodeMsgFn)cb {
       self.data = data;
       self.cb = cb;
       
       //本地相簿不需要檢查，因為UIImagePickerController會自動檢查並提醒
       UIImagePickerController *picker = [[UIImagePickerController alloc] init];
       picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
       picker.delegate = self;
       picker.allowsEditing = data.isEdit; // 設定選擇後的圖片可被編輯
       
       BOOL isOk = [PicHelper checkGallery]; // 先檢查相機可用是否
       if (isOk == NO) {
           [self doCallback:ECodePermissionDenyError msg:@"--- no gallery permission"];
       } else {
           [Tool presentVC:picker]; // 開啟相簿
       }
   }
   

相機拍照

1. 在 info.plist 中配置相機許可權提示:

   Key    :  Privacy - Camera Usage Description   
   Value  :  $(PRODUCT_NAME) camera use
   

2. 實現 <UIKit/UIKit.h> 中 UIImagePickerControllerDelegate 代理介面 (和相簿一樣)

   // 當用戶選取完成後呼叫；
   - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { ... }
   // 當用戶取消選取時呼叫；
   - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { ... }
   

3. 開啟相機

   #import <AVFoundation/AVCaptureDevice.h>
   #import <AVFoundation/AVMediaFormat.h>
   
   // 檢查相機是否可用
   +(BOOL)checkCamera{  // 如果使用者點選 不允許, 則為 0
       NSString *mediaType = AVMediaTypeVideo;
       AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
       if(AVAuthorizationStatusRestricted == authStatus || AVAuthorizationStatusDenied == authStatus) {
           return NO;
       }
       return YES;
   }
   
   // 相機拍照
   -(void)takePicture:(CPicture*)data cb:(CodeMsgFn)cb {
       self.data = data;
       self.cb = cb;
       
       if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
           UIImagePickerController *picker = [[UIImagePickerController alloc] init];
           picker.sourceType = UIImagePickerControllerSourceTypeCamera;
           picker.delegate = self;
           picker.allowsEditing = data.isEdit; // 設定拍照後的圖片可被編輯
           picker.sourceType = UIImagePickerControllerSourceTypeCamera;
           
           BOOL isOk = [PicHelper checkCamera]; // 先檢查相機可用是否
           if (isOk == NO) {
               [self doCallback:ECodePermissionDenyError msg:@"--- no camera permission"];
           } else {
               [Tool presentVC:picker]; // 開啟相機
           }
       } else {
           [self doCallback:ECodeUnknown msg:@"--- not isSourceTypeAvailable, you device may be iphonesimulator"];
       }
   }
   

4. 測試

   

踩坑

呼叫拍照閃退

報錯資訊: he app's Info.plist must contain an NSCameraUsageDescription key with a string value explaining to the user how the app uses this data

就是需要在 info.plist 中配置相機提示.