我正在使用iOS应用程序,我希望使用UIActivityItemProvider将 MULTIPLE 附件添加到电子邮件中。我想使用UIActivityItemProvider来实现它,因为在向用户显示UIActivtyViewController之前,我不想承担处理记录的开销。如果我使用NSData或NSURL对象将一个图像传入" url"返回对象的元素,然后内联图像显示正常。如果我传入这些对象的数组,那么什么都没有显示出来。我相信,如果我在初始化NSActivityViewController时使用ActivityItems参数,则传递数组将会起作用,但同样,我不想这样做,因为我想利用UIActivityItemProvider提供的延迟处理。以下是我的代码
@implementation NoteRecordActivityProvider
- (id)initWithPlaceholderItem:(id)placeholderItem
{
//Initializes and returns a provider object with the specified placeholder data
return [super initWithPlaceholderItem:placeholderItem];
}
- (id)item
{
// //Generates and returns the actual data object
NSData *imageFile = [[NSData alloc]init];
NSString *imageFileName;
NSURL *url;
NSString* exportPath;
NSMutableArray* imageArray = [[NSMutableArray alloc]initWithCapacity:0];
NSInteger photoCount = self.noteRecord.photoCount;
for (NSInteger i = 0; i < photoCount; i+=1)
{
//Add File Attachment
PhotoObject *po = (PhotoObject*)[self.noteRecord photoObjects:i];
NSString *photoGUID = [(PhotoObject*)[self.noteRecord photoObjects:i]GUID];
imageFile = ImageDataReturningMethodHere;
imageFileName = [[NSArray arrayWithObjects:@"Image", [NSString stringWithFormat:@"%ld", (long)i], @".png", nil] componentsJoinedByString:@""];
exportPath = [[FileSystemProvider exportPath] stringByAppendingPathComponent:imageFileName];
[imageFile writeToFile:exportPath atomically:YES];
url = [NSURL fileURLWithPath:exportPath];
[imageArray addObject:url];
}
if ([self.activityType isEqualToString:UIActivityTypeMail])
return imageArray;
else
return nil;
}
- (id)activityViewControllerPlaceholderItem:(UIActivityViewController *)activityViewController
{
return @{@"body":@"", @"url":[[NSURL alloc]init]};
}
-(NSString *) activityViewController:(UIActivityViewController *)activityViewController subjectForActivityType:(NSString *)activityType {
return [NSString stringWithFormat:@"Attached Record: %@", self.noteRecord.title];
}
@end
答案 0 :(得分:0)
我确实找到了这个问题的答案。首先,我创建了一个PhotoAttachmentActivityProvider,它具有源文档的属性,其中包含我要附加的照片,以及该文档中附件的索引。我在这里粘贴我的代码,该代码使用名为NoteRecord的自定义文档:
@interface EMailPhotoAttachmentItemProvider : UIActivityItemProvider
@property (nonatomic, readwrite) NSInteger photoIndex;
@property (nonatomic, strong) NoteRecord* noteRecord;
@end
然后当我展示UIActivityViewController时,我为每个附件添加了一个这些自定义UIActivityItemProvider对象:
for (NSInteger i = 0; i < self.noteRecord.photoCount; i++)
{
EMailPhotoAttachmentItemProvider* photoProvider = [[EMailPhotoAttachmentItemProvider alloc]initWithPlaceholderItem:@{@"body":textToShare, @"url":url}];
photoProvider.photoIndex = i;
photoProvider.noteRecord = self.noteRecord;
[activityProviders addObject:photoProvider];
}
//Initialize the ActivityViewController
UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:activityProviders applicationActivities:applicationActivities];
然后在自定义UIActivityItemProvider中,我检查我是否正在处理EMAIL,然后使用提供的文档和图像索引为图像创建URL:
#import "EMailPhotoAttachmentItemProvider.h"
#import "MiscUtilities.h"
#import "FileSystemProvider.h"
@implementation EMailPhotoAttachmentItemProvider
- (id)initWithPlaceholderItem:(id)placeholderItem
{
//Initializes and returns a provider object with the specified placeholder data
return [super initWithPlaceholderItem:placeholderItem];
}
- (id)item
{
if ([self.activityType isEqualToString:UIActivityTypeMail])
{
// Code here gets the image file from the NoteRecord at the PhotoIndex provided to
// the UIActivityItemProvider at the imageIndex, creates a URL for that image and returns it here.
// Your implementation will vary
PhotoObject *po = (PhotoObject*)[self.noteRecord photoObjects:self.photoIndex];
NSString *photoGUID = [(PhotoObject*)[self.noteRecord photoObjects:self.photoIndex]GUID];
NSData *imageFile = [[[MiscUtilities getApplicationDelegate]imageProvider]imageDataWithCaptionFromGUID:photoGUID caption:po.caption maxResolution:600];
NSString *imageFileName = [[NSArray arrayWithObjects:@"Image", [NSString stringWithFormat:@"%ld", (long)self.photoIndex], @".png", nil] componentsJoinedByString:@""];
imageFileName = [[FileSystemProvider exportPath] stringByAppendingPathComponent:imageFileName];
[imageFile writeToFile:imageFileName atomically:YES];
NSURL *url = [NSURL fileURLWithPath:imageFileName];
return url;
}
else
{
return nil;
};
}
- (id)activityViewControllerPlaceholderItem:(UIActivityViewController *)activityViewController
{
NSString* defaultImagePath = [[FileSystemProvider imagePath]stringByAppendingPathComponent:@"default.png"];
NSURL *url = [[NSURL alloc]initWithString:defaultImagePath];
return @{@"body":@"", @"url":url};
}
@end