如何將選定的圖像從iPhone庫轉換為ios SDK中的pdf

Question

現在我正在使用此代碼。 Pdf正在生成，但圖像未顯示。

-(void)imagePickerController:(UIImagePickerController *)pickerdidFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSLog(@"%@",info);    
    //selectedImage =  [info objectForKey:UIImagePickerControllerOriginalImage];        
    UIImage *image=[info objectForKey:UIImagePickerControllerOriginalImage];        
    NSLog(@" selected image is - %@",image);
    imageStr=[NSString stringWithFormat:@"%@",image]; 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *localFilePath=[documentsDirectory stringByAppendingPathComponent:@"images.pdf"];
    NSLog(@"file path is %@",localFilePath);
    [self pdfGenerate:localFilePath];
    UIGraphicsEndPDFContext();
    [imagePicker dismissViewControllerAnimated:YES completion:nil];
}

-(void)pdfGenerate:(NSString *)filepath
{
    UIGraphicsBeginPDFContextToFile(filepath, CGRectZero, nil);
    UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 300, 300), nil);
    [self convertImageToPdf];
}

-(void)convertImageToPdf
{
    CGRect imagerect=CGRectMake(0, 0, 300, 300);
    NSLog(@"image  is %@",imageStr);
    UIImage *image=[UIImage imageNamed:imageStr];
    [image drawInRect:imagerect];
}

Answer 1

您正在將所選圖像保存在NSString對象imageStr （imageStr = [NSString stringWithFormat：@“％@”，image];）

因此，當您在convertImageToPdf方法（UIImage * image = [UIImage imageNamed：imageStr];）中創建圖像時，您的圖像對象為nil 。 因此pdf為空白。

相反，您可以讓UIImage引用從選擇器中選擇的圖像。 在convertImageToPdf使用該引用進行繪制。

更新您的代碼：

在didFinishPickingMediaWithInfo內部

pickedImage=[info objectForKey:UIImagePickerControllerOriginalImage];        

內部convertImageToPdf

CGRect imagerect=CGRectMake(0, 0, 300, 300);
[pickedImage drawInRect:imagerect];

pickedImage是UIImage類型的對象。