我正在尝试使用AnyPic示例解析应用代码来创建类似于instagram的内容。我选择使用AVFoundation类来获得更多自定义的感觉，而不是使用UIImagePickerController中内置的AnyPics。在这一点上，我只是想保存我的图像，以下是发生这一切的功能：
首先使用图像初始化视图控制器：
- (id)initWithImage:(UIImage *)aImage {
self = [super initWithNibName:nil bundle:nil];
if (self) {
if (!aImage) {
return nil;
}
self.image = aImage;
self.fileUploadBackgroundTaskId = UIBackgroundTaskInvalid;
self.photoPostBackgroundTaskId = UIBackgroundTaskInvalid;
}
return self;
}
在视图中确实调用了loadUpload：
[self shouldUploadImage:self.image];
shouldUpload看起来像这样：
- (BOOL)shouldUploadImage:(UIImage *)anImage {
NSLog(@"FTEditPhotoViewController::shouldUploadImage %@",anImage);
UIImage *resizedImage = [anImage resizedImageWithContentMode:UIViewContentModeScaleAspectFit bounds:CGSizeMake(560.0f, 560.0f) interpolationQuality:kCGInterpolationHigh];
UIImage *thumbnailImage = [anImage thumbnailImage:86.0f transparentBorder:0.0f cornerRadius:10.0f interpolationQuality:kCGInterpolationDefault];
NSLog(@"shouldUploadImage::resizedImage: %@",resizedImage);
NSLog(@"shouldUploadImage::thumbnailImage: %@",thumbnailImage);
// JPEG to decrease file size and enable faster uploads & downloads
NSData *imageData = UIImageJPEGRepresentation(resizedImage, 0.8f);
NSData *thumbnailImageData = UIImagePNGRepresentation(thumbnailImage);
//NSLog(@"shouldUploadImage::imageData: %@",imageData);
//NSLog(@"shouldUploadImage::thumbnailImageData: %@",thumbnailImageData);
if (!imageData || !thumbnailImageData) {
return NO;
}
self.photoFile = [PFFile fileWithData:imageData];
self.thumbnailFile = [PFFile fileWithData:thumbnailImageData];
NSLog(@"shouldUploadImage::photoFile: %@",self.photoFile);
NSLog(@"shouldUploadImage::thumbnailFile: %@",self.thumbnailFile);
// Request a background execution task to allow us to finish uploading the photo even if the app is backgrounded
self.fileUploadBackgroundTaskId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
[[UIApplication sharedApplication] endBackgroundTask:self.fileUploadBackgroundTaskId];
}];
[self.photoFile saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (succeeded) {
[self.thumbnailFile saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
[[UIApplication sharedApplication] endBackgroundTask:self.fileUploadBackgroundTaskId];
if (error) {
NSLog(@"self.thumbnailFile saveInBackgroundWithBlock: %@", error);
}
}];
} else {
[[UIApplication sharedApplication] endBackgroundTask:self.fileUploadBackgroundTaskId];
}
if (error) {
NSLog(@"self.photoFile saveInBackgroundWithBlock: %@", error);
}
}];
return YES;
}
最后，当用户点击发送/发布时，功能将在以下代码中处理：
- (void)doneButtonAction:(id)sender {
NSLog(@"FTEditPhotoViewController::doneButtonAction");
NSDictionary *userInfo = [NSDictionary dictionary];
NSString *trimmedComment = [self.commentTextField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
if (trimmedComment.length != 0) {
userInfo = [NSDictionary dictionaryWithObjectsAndKeys:
trimmedComment,kFTEditPhotoViewControllerUserInfoCommentKey,
nil];
}
// Make sure there were no errors creating the image files
if (!self.photoFile || !self.thumbnailFile) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Couldn't post your photo" message:nil delegate:nil cancelButtonTitle:nil otherButtonTitles:@"Dismiss", nil];
[alert show];
return;
}
// both files have finished uploading
NSLog(@"doneButtonAction::self.photoFile: %@",self.photoFile);
NSLog(@"doneButtonAction::self.thumbnailFile: %@",self.thumbnailFile);
// create a photo object
PFObject *photo = [PFObject objectWithClassName:kFTPhotoClassKey];
[photo setObject:[PFUser currentUser] forKey:kFTPhotoUserKey];
[photo setObject:self.photoFile forKey:kFTPhotoPictureKey];
[photo setObject:self.thumbnailFile forKey:kFTPhotoThumbnailKey];
NSLog(@"doneButtonAction::PFObject photo: %@",photo);
// photos are public, but may only be modified by the user who uploaded them
PFACL *photoACL = [PFACL ACLWithUser:[PFUser currentUser]];
[photoACL setPublicReadAccess:YES];
photo.ACL = photoACL;
NSLog(@"doneButtonAction::PFObject photoACL: %@",photoACL);
// Request a background execution task to allow us to finish uploading the photo even if the app is backgrounded
self.photoPostBackgroundTaskId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
[[UIApplication sharedApplication] endBackgroundTask:self.photoPostBackgroundTaskId];
NSLog(@"FTEditPhotoViewController::doneButtonAction::saveInBackgroundWithBlock - photoPostBackgroundTaskId");
}];
// Save the Photo PFObject
[photo saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (succeeded) {
NSLog(@"FTEditPhotoViewController::doneButtonAction::saveInBackgroundWithBlock - succeeded");
[[FTCache sharedCache] setAttributesForPhoto:photo likers:[NSArray array] commenters:[NSArray array] likedByCurrentUser:NO];
// userInfo might contain any caption which might have been posted by the uploader
if (userInfo) {
NSString *commentText = [userInfo objectForKey:kFTEditPhotoViewControllerUserInfoCommentKey];
if (commentText && commentText.length != 0) {
// create and save photo caption
PFObject *comment = [PFObject objectWithClassName:kFTActivityClassKey];
[comment setObject:kFTActivityTypeComment forKey:kFTActivityTypeKey];
[comment setObject:photo forKey:kFTActivityPhotoKey];
[comment setObject:[PFUser currentUser] forKey:kFTActivityFromUserKey];
[comment setObject:[PFUser currentUser] forKey:kFTActivityToUserKey];
[comment setObject:commentText forKey:kFTActivityContentKey];
PFACL *ACL = [PFACL ACLWithUser:[PFUser currentUser]];
[ACL setPublicReadAccess:YES];
comment.ACL = ACL;
[comment saveEventually];
[[FTCache sharedCache] incrementCommentCountForPhoto:photo];
}
} else {
[photo saveEventually];
}
[[NSNotificationCenter defaultCenter] postNotificationName:FTTabBarControllerDidFinishEditingPhotoNotification object:photo];
} else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Couldn't post your photo" message:nil delegate:nil cancelButtonTitle:nil otherButtonTitles:@"Dismiss", nil];
[alert show];
}
[[UIApplication sharedApplication] endBackgroundTask:self.photoPostBackgroundTaskId];
}];
// Dismiss this screen
[self.parentViewController dismissViewControllerAnimated:YES completion:nil];
}
我已经跟踪了照片和缩略图，他们似乎确实在那里，但只是没有被保存到解析。
[5934:60b] FTEditPhotoViewController::shouldUploadImage <UIImage: 0x14d3bbf0>
[5934:60b] shouldUploadImage::resizedImage: <UIImage: 0x14db07e0>
[5934:60b] shouldUploadImage::thumbnailImage: <UIImage: 0x14db0c80>
[5934:60b] shouldUploadImage::photoFile: <PFFile: 0x14eb99d0>
[5934:60b] shouldUploadImage::thumbnailFile: <PFFile: 0x14db17d0>
[5934:60b] FTEditPhotoViewController::doneButtonAction
[5934:60b] doneButtonAction::self.photoFile: <PFFile: 0x14eb99d0>
[5934:60b] doneButtonAction::self.thumbnailFile: <PFFile: 0x14db17d0>
[5934:60b] doneButtonAction::PFObject photo: <Photo:new:(null)> {
ACL = "<PFACL: 0x14db43e0>";
image = "<PFFile: 0x14eb99d0>";
thumbnail = "<PFFile: 0x14db17d0>";
user = "<PFUser:WDk0diNx8m>";
}
[5934:60b] doneButtonAction::PFObject photoACL: <PFACL: 0x14da8180>
[5934:60b] FTEditPhotoViewController::doneButtonAction::saveInBackgroundWithBlock - succeeded
当我在解析我的班级时，我看到的是没有图像的单词文件。任何人都可以帮我弄清楚为什么图像没有保存解析？
非常感谢任何帮助！
答案 0 :(得分：0)
Timothys建议打印出URL后，我意识到该URL没有文件扩展名。然后我注意到，每当我在解析时单击文件条目时，文件就会被下载到我的桌面，并且图像正在解析时保存。但是，它没有按照我的预期保存为缩略图的PNG或PNG。 URL以“-file”结尾，该文件是下载存储在parse中的文件的链接。我通过使用以下代码解决了我的问题：
self.photoFile = [PFFile fileWithName:@"photo.jpeg" data:imageData];
self.self.thumbnailFile = [PFFile fileWithName:@"thumbnail.png" data:imageData];
分别将图像保存为jpeg或缩略图。