iOS 打開相冊或相機

iOS圖片 : 打開相機或打開相冊

首先, 在應用中打開相機或者是打開相冊都會有一個彈窗之類的,讓用戶選擇到底是打開相冊,還是打開相機

這裏我們以彈出對話框爲例

1. 首先對 UIImageView 添加一個輕拍手勢, 在輕拍手勢的方法中創建一個 UIActionSheet 的對象
   

   //在本類中要遵從 UIActionSheetDelegate 協議 
   
   UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:@"獲取照片" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"相冊", @"拍照", nil]; 
   
   [sheet showInView:self.view]; 
   
   [sheet release];

2. 給 UIActionSheet 對象添加響應事件

   - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
   switch (buttonIndex) {
       case 0:
           //從相冊中讀取
           [self readImageFromAlbum];
           break;
       case 1:
           //拍照
           [self readImageFromCamera];
           break;  
       case 2:
           break; 
       default:
           break;
   }
   }
   

   //從相機中讀取相片
   -(void)readImageFromAlbum {
   UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];//創建對象
   imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//（選擇類型）表示僅僅從相冊中選取照片
   imagePicker.delegate = self;//指定代理，因此我們要實現UIImagePickerControllerDelegate,  UINavigationControllerDelegate協議
   imagePicker.allowsEditing = YES;//設置在相冊選完照片後，是否跳到編輯模式進行圖片剪裁。(允許用戶編輯)
   [self presentViewController:imagePicker animated:YES completion:nil];//顯示相冊
   [imagePicker release];
   }

   //拍照
   -(void)readImageFromCamera {
   //判斷選擇的模式是否爲相機模式，如果沒有彈窗警告
   if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
       UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
       imagePicker.allowsEditing = YES;//允許編輯
       imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
       imagePicker.delegate = self;
       [self presentViewController:imagePicker animated:YES completion:nil];
       [imagePicker release];
   } else {
       //彈出窗口響應點擊事件
       UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"警告" message:@"未檢測到攝像頭" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"確定", nil];//警告。。確認按鈕
       [alert show];
       [alert release];
   }
   }

   //在本類中需要遵從 UIImagePickerControllerDelegate 協議
   //圖片編輯完成之後觸發, 顯示圖片在button上
   -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {
   //參數image 就是最終選擇的圖片
   HeaderView *header = (HeaderView*)self.tableView.tableHeaderView;
   [header.iconView setImage:image forState:(UIControlStateNormal)];
   [self dismissViewControllerAnimated:YES completion:nil];
   }

至此 , 就可以打開相機或相冊了!