如何保存拍摄的照片

Question

我想保存我在应用中拍摄的照片。我想保存图片，这样即使我关闭应用程序，图片仍会保存。这是我写到现在的代码

-(IBAction)TakePhoto {
    picker = [[UIImagePickerController alloc]init];
    picker.delegate = self;
    [picker setSourceType:UIImagePickerControllerSourceTypeCamera];
    [self presentViewController:picker animated:YES completion:nil];
}

- (IBAction)ChooseExisting {
    picker2 = [[UIImagePickerController alloc]init];
    picker2.delegate = self;
    [picker2 setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
    [self presentViewController:picker2 animated:YES completion:nil];
}

- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    image = [info objectForKey:UIImagePickerControllerOriginalImage];
    [imageview setImage:image];
    [self dismissViewControllerAnimated:YES completion:nil];

}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [self dismissViewControllerAnimated:YES completion:NULL];
}

我应该如何让应用程序保存我拍摄的照片并显示它。

Answer 1

NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString * basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;

UIImage * imageToSave = [UIImage imageNamed:@"Icon.png"];
NSData * binaryImageData = UIImagePNGRepresentation(imageToSave);

[binaryImageData writeToFile:[basePath stringByAppendingPathComponent:@"myfile.png"] atomically:YES];

Copied from here

您可能需要使用 imageToSave 变量编辑该行并将其更改为 UIImage 变量，这是您从相机获得的。

Answer 2

用你的方法试试这个：

- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    image = [info objectForKey:UIImagePickerControllerOriginalImage];
    [imageview setImage:image];

    //Save Your Image ======
    UIImage *yourImage  = imageView.image;//imageView.image;
    NSString *docDirPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    NSString *filePath = [docDirPath stringByAppendingPathComponent:@"myImageFile.png"];
    [UIImagePNGRepresentation(yourImage) writeToFile:filePath atomically:YES];



    [self dismissViewControllerAnimated:YES completion:nil];

}

在你 viewDidLoad 的同一个类中这样写：

 //For Get your Image from Documents Dir
    NSString *docDirPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    NSString *filePath = [docDirPath stringByAppendingPathComponent:@"myImageFile.png"];

    if([[NSFileManager defaultManager] fileExistsAtPath:filePath])
    {
//if file already saved then set it on your imageView
        UIImage *getYourImage = [UIImage imageWithContentsOfFile:filePath];
        imageView.image = getYourImage;
    }
    else
    {
//otherwise set a Dummy Image on your ImageView or nil
        imageView.image = nil; //[UIImage imageNamed:@"dummyImage.png"];

    }

Answer 3

// 调用该方法从摄像头抓图

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{
    //Get image
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
    //Display in ImageView object (if you want to display it
    [imageView setImage:image];
        [ButtonName setImage:image forState:UIControlStateNormal];
    //Take image picker off the screen (required)
    [self dismissModalViewControllerAnimated:YES];
}

// 保存图像：

- (NSString *)saveImage:(UIImage*)image:(NSString*)imageName 
{    
    NSData *imageData = UIImagePNGRepresentation(image); //convert image into .png format.    
    NSFileManager *fileManager = [NSFileManager defaultManager];//create instance of NSFileManager
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //create an array and store result of our search for the documents directory in it
    NSString *documentsDirectory = [paths objectAtIndex:0]; //create NSString object, that holds our exact path to the documents directory
    NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", imageName]]; //add our image to the path
    [fileManager createFileAtPath:fullPath contents:imageData attributes:nil]; //finally save the path (image)
    NSLog(@"FULL PATH %@",fullPath);
    NSLog(@"image saved");
    return fullPath;
}

// 删除图像

- (void)removeImage:(NSString*)fileName 
{   

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png", fileName]];

    [fileManager removeItemAtPath: fullPath error:NULL];

    NSLog(@"image removed");    
}

// 从图库中加载图片

- (UIImage*)loadImage:(NSString*)imageName
 {

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@", imageName]];

    NSLog(@"Loading Image Path : %@",fullPath);

    return [UIImage imageWithContentsOfFile:fullPath];

}