选择图像后如何在 ios 中本地保存图像

Question

当我捕获图像时，我需要在 table 视图中一张一张地保存图像，如下图所示。是需要使用 nsuser 默认值还是使用核心数据？选择图像后如何添加到数组

Answer 1

您可以将图像保存在 NSUserDefaults 中，如下所示，

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
    if(!self.phto_arr_)
   {
     self.phto_arr_ = [[NSMutableArray alloc] init];
   }
[self.phto_arr_ addObject: chosenImage];
NSData *encodedObject = [NSKeyedArchiver archivedDataWithRootObject:self.phto_arr_];
[[NSUserDefaults standardUserDefaults] setObject: encodedObject forKey:@"images"];
[[NSUserDefaults standardUserDefaults] synchronize];
[picker dismissViewControllerAnimated:YES completion:NULL];
}

Answer 2

是的，您可以将图像保存在文档目录中，并在从 doc 中检索图像后将图像文件名保存在数组中。目录。就像这样

// For error information
    NSError *error;
    NSFileManager *fileMgr = [NSFileManager defaultManager];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
    NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"/YOUR_IMG_FOLDER"];

    if (![fileMgr fileExistsAtPath:dataPath])
        [[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error]; //Create folder

    //Get the current date and time and set as image name
    NSDate *now = [NSDate date];

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = @"yyyy-MM-dd_HH-mm-ss";
    [dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
    NSString *gmtTime = [dateFormatter stringFromDate:now];
    NSLog(@"The Current Time is :%@", gmtTime);

    NSData *imageData = UIImageJPEGRepresentation(_postImage, 0.5); // _postImage is your image file and you can use JPEG representation or PNG as your wish
    int imgSize = imageData.length;
    ////NSLog(@"SIZE OF IMAGE: %.2f Kb", (float)imgSize/1024);

    NSString *imgfileName = [NSString stringWithFormat:@"%@%@", gmtTime, @".jpg"];
    // File we want to create in the documents directory
     NSString *imgfilePath= [dataPath stringByAppendingPathComponent:imgfileName];
    // Write the file
    [imageData writeToFile:imgfilePath atomically:YES];

     **// Keep your Image file name into an mutable array here OR you can saved the array in a UserDefaults**

然后从文档中检索。目录。从迭代数组。

//Get image file from sand box using file name and file path
NSString *stringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"YOUR_IMG_FOLDER"];
stringPath  = [stringPath stringByAppendingPathComponent:imgFile]; // imgFile to get from your array, where you saved those image file names  
UIImage *image = [UIImage imageWithContentsOfFile:stringPath];

谢谢...编码愉快。

Answer 3

尝试以下代码：假设您还想显示图片名称，请使用此代码，

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
  chosenImage = info[UIImagePickerControllerOriginalImage];
  chosenImage = [UIImage unrotateImage:chosenImage];    
  addGalleryImageview.image = chosenImage;
  isCameraOn = YES;    
  NSString* fileName = [NSString stringWithFormat:@"gallery%@",[Utils getDateString]];
  imageNamelbl.text = fileName;  
  [picker dismissViewControllerAnimated:YES completion:NULL];}


- (UIImage*)unrotateImage:(UIImage*)image{
   CGSize size = image.size;
   UIGraphicsBeginImageContext(size);
   [image drawInRect:CGRectMake(0,0,size.width ,size.height)];
   UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();   
   return newImage;}

选择图像后如何在 ios 中本地保存图像

after picking the image how save images locally in ios

objective-c

ios

ios5

ios7

ios7.1