iOS使用照片選取器(UIImagePickerControllerDelegate)後儲存至資料庫、圖片壓縮
| iOS使用照片選取器(UIImagePickerControllerDelegate)後儲存至資料庫、圖片壓縮 |
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| 先看UIImagePickerControllerDelegate的協定，主要是利用iOS內建的圖片選取控制器 |
| -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info |
| 取得照片後的處理，範例 |
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-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];// UIImage *cmpImg = [appDelegate scaleImage:image toScale:kImageScaleRate];//縮圖 NSData *blobImage = UIImageJPEGRepresentation(cmpImg, kImageCompressRate);//圖片壓縮為NSData [self dismissModalViewControllerAnimated:YES]; [self updateImage:blobImage withIndexPath:indexPath_];//更新圖片(自定義函數) } |
| 叫起圖片選取器 |
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-(void)snapImage:(id)sender { UIImagePickerController *ipc = [[UIImagePickerController alloc]init]; ipc.sourceType = UIImagePickerControllerSourceTypeCamera;//圖片來源 ipc.videoQuality = UIImagePickerControllerQualityTypeLow; ipc.delegate = self; ipc.allowsEditing = NO; [self presentModalViewController:ipc animated:YES]; } |
| 縮圖函數(自定義) |
| - (UIImage *)scaleImage:(UIImage *)image toScale:(float)scaleSize
{ UIGraphicsBeginImageContext(CGSizeMake(image.size.width*scaleSize,image.size.height*scaleSize)); [image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height *scaleSize)]; UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return scaledImage; } |
| 儲存至資料庫※圖片傳入時已是NSData |
| -(void)updateImage:(NSData*)image withIndexPath:(NSIndexPath*)indexPath
{ NSDateFormatter *dateformat = [[NSDateFormatter alloc]init]; [dateformat setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; NSDate* spentDate = [(SpentMoney*)[dailyContent objectAtIndex:indexPath.row] spentDate]; NSString *date = [NSString stringWithString:[dateformat stringFromDate: spentDate]]; //圖片傳入的時候，已經是NSData了，所以只要單純寫入即可 BOOL sucess = [fmdb executeUpdate:@"update spentMoney set contentImage =? where spentDate=?",image, date]; if (!sucess) { [appDelegate showMessageWith:@"fail to insert image" andMessage:nil]; } dateformat = nil; [self fetchData]; } |
| 自資料庫讀取，範例是tableView的Cell資料呈現的內容，看紅色字部份 |
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- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell==nil) { cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier]; } cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton; SpentMoney *spentMoney = [dailyContent objectAtIndex:indexPath.row]; NSDateFormatter *dateformat = [[NSDateFormatter alloc]init]; dateformat.dateFormat = @"HH:mm:ss"; cell.textLabel.text = [dateformat stringFromDate: spentMoney.spentDate]; cell.detailTextLabel.text = [NSString stringWithFormat:@"$%@",spentMoney.money]; //圖片存至資料庫時是用NSData，讀取也只要用imageWithData把圖片讀取出來 cell.imageView.image = [UIImage imageWithData:spentMoney.contentImage]; return cell; dateformat = nil; } |