如何从 UIImagePickerController 将图像保存到应用程序文件夹？答案

【问题标题】：How to Save Image to Application Folder from UIImagePickerController?如何从 UIImagePickerController 将图像保存到应用程序文件夹？
【发布时间】：2015-04-14 06:48:25
【问题描述】：

我想到了一个让我发疯的问题。我已经搜索了很多来解决它，但是我找到的所有答案都是旧的并且没有帮助。

我目前正在开发使用 UIImagePickerControllerDelegate 和 didFinishPickingMediaWithInfo 的应用程序，我想将所选图像保存到应用程序文件夹。

到目前为止，我可以用这个选择图像；

- (IBAction)btnPressed:(UIButton *)sender
{
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
    {
        UIImagePickerController *imgPicker = [[UIImagePickerController alloc] init];
        imgPicker.delegate = self;
        imgPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        imgPicker.mediaTypes = [NSArray arrayWithObject:(NSString *)kUTTypeImage];
        imgPicker.allowsEditing = NO;

        [self presentViewController:imgPicker animated:YES completion:nil];
    }

}

但无法使用 didFinishPickingMediaWithInfo 将其保存到应用程序；

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    [self dismissViewControllerAnimated:YES completion:nil];
    if ([mediaType isEqualToString:(NSString *) kUTTypeImage])
    {
        UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

        //Assigning the selected image to imageView to see on UI side.
        imageViewerImage.image = image;
    }
}

我想知道这一点之后的部分应该是什么。

感谢您提供的任何帮助。

【问题讨论】：

所以问题是如何将 UIImage 写入文件夹中的文件。
是的@gabbler 这正是我要找的。span>
你没有搜索很多来解决它，否则你会找到它，因为它是“将图像保存到 ios 中的文档文件夹”的第一个搜索结果 - stackoverflow.com/questions/2037432/…。

标签： ios objective-c iphone ios8 uiimagepickercontroller

【解决方案1】：

我在我的项目中这样做了：

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    UIImage * imageDone = [info objectForKey:@"UIImagePickerControllerEditedImage"];
    [self saveImage:imageDone];
    [self.popover dismissPopoverAnimated:YES];
}

-(void)saveImage:(UIImage*)image{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
   NSString *documentsDirectory = [paths objectAtIndex:0];    
   NSString * imgpath = [documentsDirectory stringByAppendingFormat:@"/media/img/"];

   long x = arc4random() % 10000;
   NSString * namePic = [NSString stringWithFormat:@"%lld%ld-photo.jpg", self.idToLoad.longLongValue, x];
   NSString * stringName = [NSString stringWithFormat:@"%@%@", imgpath, namePic];
   [UIImageJPEGRepresentation(image, 0.3) writeToFile:stringName atomically:YES];
}

【讨论】：

【解决方案2】：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{

    [self dismissViewControllerAnimated:YES completion:NULL];

UIImage* image;

if([[info valueForKey:@"UIImagePickerControllerMediaType"] isEqualToString:@"public.image"])
    {

  image = [info valueForKey:@"UIImagePickerControllerOriginalImage"];

 NSString *stringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"New Folder"];

// New Folder is your folder name

 NSError *error = nil;

if (![[NSFileManager defaultManager] fileExistsAtPath:stringPath])
    [[NSFileManager defaultManager] createDirectoryAtPath:stringPath withIntermediateDirectories:NO attributes:nil error:&error];

NSString *fileName = [stringPath stringByAppendingFormat:@"/image.jpg"];

NSData *data = UIImageJPEGRepresentation(image, 1.0);

[data writeToFile:fileName atomically:YES];

   }
}

【讨论】：

像魅力一样工作！我已经根据自己的需要进行了一些配置，但毕竟它对我有用。
不要对键使用字符串文字。 Apple 为这些值提供了适当的常量。使用它们。示例：使用UIImagePickerControllerOriginalImage 而不是@"UIImagePickerControllerOriginalImage"。

【解决方案3】：

//In Your - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage (UIImage *)image editingInfo:(NSDictionary *)editingInfo . Write this code

NSData *pngData = UIImagePNGRepresentation(image);

//This pulls out PNG data of the image you've captured. From here, you can write it to a file:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  
NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory 
NSString *filePath = [documentsPath stringByAppendingPathComponent:@"image.png"]; //Add the file name
[pngData writeToFile:filePath atomically:YES]; //Write the file

【讨论】：

【解决方案4】：

只需将图像保存在您的应用文档目录中即可：

// first find the path in which to save the image :
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *baseDir = [paths objectAtIndex:0];

// then save image as JPEG
NSString* filename = [baseDir stringByAppendingPathComponent:@"filename.jpg"];
[UIImageJPEGRepresentation(image, 1.0) writeToFile:jpgPath atomically:YES];
// or PNG
NSString* filename = [baseDir stringByAppendingPathComponent:@"filename.png"];
[UIImagePNGRepresentation(image) writeToFile:pngPath atomically:YES];

【讨论】：

【解决方案5】：

将 UIImage 保存到文档文件夹，如下所示：

UIImage* myUIImage = ...
NSData *pngData = UIImagePNGRepresentation(myUIImage);
//NSData *pngData = UIImageJPEGRepresentation(myUIImage,0.5); //alternative comressed jpg instead of png
NSString *filePath = [[self buildDocumentsPath] stringByAppendingPathComponent:@"pictureName.png"]; //Add the file name
[pngData writeToFile:filePath atomically:YES]; //Write the file

以字符串形式获取文档的路径：

- (NSString *)buildDocumentsPath{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
    NSString *documentsPath = [paths objectAtIndex:0];
    return documentsPath;
}

【讨论】：

【解决方案6】：

试试这个代码。它可能会帮助你。 :)

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    imgViewProfile.image = info[UIImagePickerControllerEditedImage];
    [picker dismissViewControllerAnimated:YES completion:^{ }];
    // ------ Now save this image to document directory by getting its path
}

【讨论】：