iphone - 将图片存储在应用程序目录中并为其命名。

Question

我正在为 iphone 创建一个相机应用程序，但我面临一个问题。

我希望能够提供我拍摄的照片，将其存储在应用程序的私有目录中，并为其提供自定义名称（当然是通过代码）。例如，我拍了一张照片，我想将这张照片命名为 mmddyyyyhhmmssXYZ 并将事物图像存储在 myApp/images 目录中。

请让我知道这是否可能。如果可能的话，任何有关的建议或教程都会非常有帮助。

作为 iphone 应用程序开发的新手......我现在实际上对此一无所知。

谢谢

Answer 1

这是我的代码见下文。

-(void)copyImagesToCache:(NSString*)imageURl
{

    NSFileManager *filemanager=[NSFileManager defaultManager];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *folderPath = [documentsDirectory stringByAppendingPathComponent:@"MyIMages"];

            //now no need to use below single line of code.
//NSString *srcPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"image.png"];
//it just a example here , here you should make a source  path as you pic the images form the camera.

编辑：在 ImagePicker 中选择时，您应该创建一个路径。见下面 ImagePickerViewControllerDelegate.i 的代表已经展示了方式

    if(![filemanager contentsOfDirectoryAtPath:folderPath error:nil]){
        [filemanager createDirectoryAtPath:folderPath withIntermediateDirectories:YES attributes:nil error:nil];

    }
    NSString *destPath = [folderPath stringByAppendingPathComponent:@"image1.png"];//here you should create the dynamic name so that you can distinguish all images.
    NSError *err;
  BOOL isCopeid= [filemanager copyItemAtPath:srcPath toPath:destPath error:&err];
  if(isCopeid)
    NSLog(@"Copied");
}


  - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:     (UIImage *)image editingInfo:(NSDictionary *)editingInfo
 { 
  myIMage.image = image;
 //here call the method whcih copy the image to cache
 [self copyImagesToCache: [editingInfo objectForKey:UIImagePickerControllerReferenceURL]]];  
 [here is the link which shown the  editingInfo's keys ][1] 

//remaining code goes here as it is   
}

我希望它可以帮助你......！！！！

Answer 2

将图像写入应用程序私有目录的功能-

-(void)writeImagetoPath
 {

    UIImage *myImage = //This is the UIImage you obtained from the camera or the photo library.

    //This is the path
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *documentsPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"xyz.png",i]];//You can give any name to the path.

    //Now convert the uiimage to data before writing to file.
    NSData *imgData = UIImagePNGRepresentation(myImage);
    [imgData writeToFile:documentsPath atomically:YES];

}