Struct MLModelCollection

Source

#[repr(C)]
pub struct MLModelCollection { /* private fields */ }

👎Deprecated: Use Background Assets or NSURLSession instead.

Available on crate feature MLModelCollection only.

Expand description

MLModelCollection

A collection of models managed as part of Core ML Model Deployment.

Implementations§

Source §

impl MLModelCollection

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pub unsafe fn identifier(&self) -> Retained<NSString>

👎Deprecated: Use Background Assets or NSURLSession instead.

The identifier of the model collection you want to access, as configured in the Core ML Model Deployment dashboard.

Source

pub unsafe fn entries( &self, ) -> Retained<NSDictionary<NSString, MLModelCollectionEntry>>

👎Deprecated: Use Background Assets or NSURLSession instead.

Available on crate feature MLModelCollectionEntry only.

Information about the models downloaded in the collection, or an empty dictionary if the collection has not been downloaded.

Source

pub unsafe fn deploymentID(&self) -> Retained<NSString>

👎Deprecated: Use Background Assets or NSURLSession instead.

The identifier for the currently downloaded deployment, corresponding to a recent deployment on the Core ML Model Deployment dashboard.

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pub unsafe fn beginAccessingModelCollectionWithIdentifier_completionHandler( identifier: &NSString, completion_handler: &DynBlock<dyn Fn(mut MLModelCollection, mut NSError)>, ) -> Retained<NSProgress>

👎Deprecated: Use Background Assets or NSURLSession instead.

Available on crate feature block2 only.

Request access to a model collection. If the collection is not downloaded on the device, it is requested from Core ML Model Deployment.

When called, this method downloads the model collection if it is not already on the device. Once all models are downloaded, an MLModelCollection instance is made available for use with the completion handler.

Parameter identifier: The model collection identifier, as managed in Core ML Model Deployment.

Parameter completionHandler: The completion handler, invoked with a valid MLModelCollection instance on success or NSError on failure.

Returns: NSProgress for updates during setup and download of the model collection

Source

pub unsafe fn endAccessingModelCollectionWithIdentifier_completionHandler( identifier: &NSString, completion_handler: &DynBlock<dyn Fn(Bool, *mut NSError)>, )

👎Deprecated: Use Background Assets or NSURLSession instead.

Available on crate feature block2 only.

End access to a model collection. This informs the system you have finished accessing the models within the collection.

Call this method as soon as you have finished using the models in this collection.

Parameter identifier: The model collection identifier, as managed in Core ML Model Deployment.

Parameter completionHandler: The completion handler, invoked with YES on success or NSError on failure.

Source

pub unsafe fn init(this: Allocated<Self>) -> Retained<Self>

👎Deprecated: Use Background Assets or NSURLSession instead.

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pub unsafe fn new() -> Retained<Self>

👎Deprecated: Use Background Assets or NSURLSession instead.

Methods from Deref<Target = NSObject>§

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pub fn doesNotRecognizeSelector(&self, sel: Sel) -> !

Handle messages the object doesn’t recognize.

See Apple’s documentation for details.

Methods from Deref<Target = AnyObject>§

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pub fn class(&self) -> &'static AnyClass

Dynamically find the class of this object.

§Panics

May panic if the object is invalid (which may be the case for objects returned from unavailable init/new methods).

§Example

Check that an instance of NSObject has the precise class NSObject.

use objc2::ClassType;
use objc2::runtime::NSObject;

let obj = NSObject::new();
assert_eq!(obj.class(), NSObject::class());

Source

pub unsafe fn get_ivar<T>(&self, name: &str) -> &T
where T: Encode,

👎Deprecated: this is difficult to use correctly, use Ivar::load instead.

Use Ivar::load instead.

§Safety

The object must have an instance variable with the given name, and it must be of type T.

See Ivar::load_ptr for details surrounding this.

Source

pub fn downcast_ref<T>(&self) -> Option<&T>
where T: DowncastTarget,

Attempt to downcast the object to a class of type T.

This is the reference-variant. Use Retained::downcast if you want to convert a retained object to another type.

§Mutable classes

Some classes have immutable and mutable variants, such as NSString and NSMutableString.

When some Objective-C API signature says it gives you an immutable class, it generally expects you to not mutate that, even though it may technically be mutable “under the hood”.

So using this method to convert a NSString to a NSMutableString, while not unsound, is generally frowned upon unless you created the string yourself, or the API explicitly documents the string to be mutable.

See Apple’s documentation on mutability and on isKindOfClass: for more details.

§Generic classes

Objective-C generics are called “lightweight generics”, and that’s because they aren’t exposed in the runtime. This makes it impossible to safely downcast to generic collections, so this is disallowed by this method.

You can, however, safely downcast to generic collections where all the type-parameters are AnyObject.

§Panics

This works internally by calling isKindOfClass:. That means that the object must have the instance method of that name, and an exception will be thrown (if CoreFoundation is linked) or the process will abort if that is not the case. In the vast majority of cases, you don’t need to worry about this, since both root objects NSObject and NSProxy implement this method.

§Examples

Cast an NSString back and forth from NSObject.

use objc2::rc::Retained;
use objc2_foundation::{NSObject, NSString};

let obj: Retained<NSObject> = NSString::new().into_super();
let string = obj.downcast_ref::<NSString>().unwrap();
// Or with `downcast`, if we do not need the object afterwards
let string = obj.downcast::<NSString>().unwrap();

Try (and fail) to cast an NSObject to an NSString.

use objc2_foundation::{NSObject, NSString};

let obj = NSObject::new();
assert!(obj.downcast_ref::<NSString>().is_none());

Try to cast to an array of strings.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);
// This is invalid and doesn't type check.
let arr = arr.downcast_ref::<NSArray<NSString>>();

This fails to compile, since it would require enumerating over the array to ensure that each element is of the desired type, which is a performance pitfall.

Downcast when processing each element instead.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);

for elem in arr {
    if let Some(data) = elem.downcast_ref::<NSString>() {
        // handle `data`
    }
}