Struct LARightStore

Source

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

Available on crate feature LARightStore only.

Expand description

Persistent storage for LARightinstances.

Implementations§

Source §

impl LARightStore

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pub unsafe fn sharedStore() -> Retained<LARightStore>

Shared instance of LARightStore.

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pub unsafe fn rightForIdentifier_completion( &self, identifier: &NSString, handler: &DynBlock<dyn Fn(mut LAPersistedRight, mut NSError)>, )

Available on crate features LAPersistedRight and LARight and block2 only.

Fetches a right stored under the given identifier.

Parameter identifier: Identifier associated with a previously stored right.

Parameter handler: Completion handler with the fetched right or an error on failure.

Source

pub unsafe fn saveRight_identifier_completion( &self, right: &LARight, identifier: &NSString, handler: &DynBlock<dyn Fn(mut LAPersistedRight, mut NSError)>, )

Available on crate features LAPersistedRight and LARight and block2 only.

Persists a right for later usage.

Parameter right: LARightinstance to store.

Parameter identifier: Identifier to be associated with the right. Useful for later retrieval.

Parameter handler: Completion handler with the persisted right or an error on failure.

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pub unsafe fn saveRight_identifier_secret_completion( &self, right: &LARight, identifier: &NSString, secret: &NSData, handler: &DynBlock<dyn Fn(mut LAPersistedRight, mut NSError)>, )

Available on crate features LAPersistedRight and LARight and block2 only.

Persists a right for later usage.

Parameter right: LARightinstance to store.

Parameter identifier: Identifier to be associated with the right. Useful for later retrieval.

Parameter secret: Secret data to be associated with the provided right.

Parameter handler: Completion handler with the persisted right or an error on failure.

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pub unsafe fn removeRight_completion( &self, right: &LAPersistedRight, handler: &DynBlock<dyn Fn(*mut NSError)>, )

Available on crate features LAPersistedRight and LARight and block2 only.

Removes a right from the persistent storage along with its associated resources.

Parameter right: LAPersistedRightinstance to remove.

Parameter handler: Completion handler with an error on failure.

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pub unsafe fn removeRightForIdentifier_completion( &self, identifier: &NSString, handler: &DynBlock<dyn Fn(*mut NSError)>, )

Available on crate feature block2 only.

Removes right with provided identifier from persistant storage.

Parameter identifier: Identifier of LAPersistedRightinstance to remove.

Parameter handler: Completion handler with an error on failure.

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pub unsafe fn removeAllRightsWithCompletion( &self, handler: &DynBlock<dyn Fn(*mut NSError)>, )

Available on crate feature block2 only.

Removes all rights stored by the client

Parameter handler: Completion handler with an error on failure.

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

Clients should rely on the sharedinstance instead

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

Clients should rely on the sharedinstance 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());

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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`
    }
}