Question

我有一个包含ALASSETS的集合视图，我希望能够在集合视图中选择一个项目（照片）并将其作为附件发送到电子邮件中。集合视图基于教程，iPhone编程教程：创建图像库这是最近的帖子，因此它应该是最新的。

用户选择照片时执行的代码如下。

-(void) collectionView:(UICollectionView *)collectionView         didSelectItemAtIndexPath:`enter code here`(NSIndexPath *)indexPath
{ 
 ALAsset *asset = self.assets[indexPath.row];
 ALAssetRepresentation *defaultRep = [asset defaultRepresentation];
 UIImage *image = [UIImage imageWithCGImage:[defaultRep fullScreenImage] scale:[defaultRep scale] orientation:0];



[self.testImage setImage:[UIImage imageWithCGImage:[defaultRep fullScreenImage] scale:[defaultRep scale] orientation:0]];
[self.testImage2 setImage:[UIImage imageWithCGImage:[asset thumbnail]]];

// send email
if ([MFMailComposeViewController canSendMail]) {

    MFMailComposeViewController *controller = [[MFMailComposeViewController alloc] init];
    controller.mailComposeDelegate = self;
    [controller setToRecipients:[NSArray arrayWithObject:@"rasmus4200@gmail.com"]];
    [controller setSubject:@"Subject Goes Here."];
    [controller setMessageBody:@"Your message goes here." isHTML:NO];

    // Attach an image to the email
    //NSData *myData = UIImagePNGRepresentation(coolImage);
    //NSData *myData = UIImageJPEGRepresentation([UIImage imageWithCGImage:[asset thumbnail]], 1.0);
    NSData *myData = UIImageJPEGRepresentation(image, 1.0);
    [controller addAttachmentData:myData mimeType:@"image/jpg" fileName:@"coolImage.jpg"];

    [self presentModalViewController:controller animated:YES];
}
else {
    NSLog(@"Device is unable to send email in its current state.");
}

重要的代码行似乎是。

我现在应该有一张图片，我可以将其作为附件传递给电子邮件，如下所示

NSData *myData = UIImageJPEGRepresentation(image, 1.0);

但是当我查看我的电子邮件时，没有图像。

我想也许我实际上并没有获得资产所以我做了以下测试我决定将资产缩略图包括如下，现在已注释

NSData *myData = UIImageJPEGRepresentation([UIImage imageWithCGImage:[asset thumbnail]], 1.0);

这样可以正常创建带缩略图的电子邮件

这个问题让我撕掉了我的头发，所以任何帮助都会被感激地接受。

我已经尝试了以下许多形状和形式来检索图像，但似乎没有任何效果

尝试1：

// Set up Blocks
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *asset)
{
    UIImage *coolImage;

    // get the image
    ALAssetRepresentation *rep = [asset defaultRepresentation];
    CGImageRef iref = [rep fullResolutionImage];
    if (iref) {
        coolImage = [UIImage imageWithCGImage:iref];
    }

    // send email
    if ([MFMailComposeViewController canSendMail]) {

        MFMailComposeViewController *controller = [[MFMailComposeViewController alloc] init];
        controller.mailComposeDelegate = self;
        [controller setToRecipients:[NSArray arrayWithObject:@"rasmus4200@gmail.com"]];
        [controller setSubject:@"Subject Goes Here."];
        [controller setMessageBody:@"Your message goes here." isHTML:NO];

        // Attach an image to the email
        //NSData *myData = UIImagePNGRepresentation(coolImage);
        NSData *myData = UIImageJPEGRepresentation(coolImage, 1.0);
        [controller addAttachmentData:myData mimeType:@"image/jpg" fileName:@"coolImage.jpg"];

        [self presentModalViewController:controller animated:YES];
    }
    else {
        NSLog(@"Device is unable to send email in its current state.");
    }
};


ALAssetsLibraryAccessFailureBlock failureblock  = ^(NSError *myerror)
{
    NSLog(@"booya, cant get image - %@",[myerror localizedDescription]);
};



// GET THE URL of image
NSURL *url = [[NSURL alloc] init];
url = asset.defaultRepresentation.url;

// create library and set callbacks
ALAssetsLibrary *al = [ConDetailsViewController defaultAssetsLibrary];
[al assetForURL:url
    resultBlock:resultblock
   failureBlock:failureblock];

}

从ALASSET获取UIImage以在发送电子邮件时使用广告附件

0 个答案: