Struct NSManagedObjectContext 

pub struct NSManagedObjectContext { /* private fields */ }

Available on crate feature NSManagedObjectContext only.

Apple’s documentation

Implementations

impl NSManagedObjectContext

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

👎Deprecated: Use -initWithConcurrencyType: instead

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

👎Deprecated: Use -initWithConcurrencyType: instead

pub unsafe fn initWithConcurrencyType( this: Allocated<Self>, ct: NSManagedObjectContextConcurrencyType, ) -> Retained<Self>

pub unsafe fn performBlock(&self, block: &DynBlock<dyn Fn()>)

Available on crate feature block2 only.

Safety

block block must be sendable.

pub unsafe fn performBlockAndWait(&self, block: &DynBlock<dyn Fn() + '_>)

Available on crate feature block2 only.

Safety

block block must be sendable.

pub unsafe fn persistentStoreCoordinator( &self, ) -> Option<Retained<NSPersistentStoreCoordinator>>

Available on crate feature NSPersistentStoreCoordinator only.

pub unsafe fn setPersistentStoreCoordinator( &self, persistent_store_coordinator: Option<&NSPersistentStoreCoordinator>, )

Available on crate feature NSPersistentStoreCoordinator only.

Setter for persistentStoreCoordinator.

pub unsafe fn parentContext(&self) -> Option<Retained<NSManagedObjectContext>>

pub unsafe fn setParentContext( &self, parent_context: Option<&NSManagedObjectContext>, )

Setter for parentContext.

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

pub unsafe fn setName(&self, name: Option<&NSString>)

Setter for name.

This is copied when set.

pub unsafe fn undoManager( &self, mtm: MainThreadMarker, ) -> Option<Retained<NSUndoManager>>

This property is not atomic.

Safety

This might not be thread-safe.

pub unsafe fn setUndoManager(&self, undo_manager: Option<&NSUndoManager>)

Setter for undoManager.

Safety

This might not be thread-safe.

pub unsafe fn hasChanges(&self) -> bool

This property is not atomic.

Safety

This might not be thread-safe.

pub unsafe fn userInfo(&self) -> Retained<NSMutableDictionary>

This property is not atomic.

Safety

• The returned generic should be of the correct type.
• This might not be thread-safe.

pub unsafe fn concurrencyType(&self) -> NSManagedObjectContextConcurrencyType

pub unsafe fn objectRegisteredForID( &self, object_id: &NSManagedObjectID, ) -> Option<Retained<NSManagedObject>>

Available on crate features NSManagedObject and NSManagedObjectID only.

pub unsafe fn objectWithID( &self, object_id: &NSManagedObjectID, ) -> Retained<NSManagedObject>

Available on crate features NSManagedObject and NSManagedObjectID only.

pub unsafe fn existingObjectWithID_error( &self, object_id: &NSManagedObjectID, ) -> Result<Retained<NSManagedObject>, Retained<NSError>>

Available on crate features NSManagedObject and NSManagedObjectID only.

pub unsafe fn executeFetchRequest_error( &self, request: &NSFetchRequest, ) -> Result<Retained<NSArray>, Retained<NSError>>

Available on crate features NSFetchRequest and NSPersistentStoreRequest only.

Safety

request generic should be bound by NSFetchRequestResult.

pub unsafe fn executeRequest_error( &self, request: &NSPersistentStoreRequest, ) -> Result<Retained<NSPersistentStoreResult>, Retained<NSError>>

Available on crate features NSPersistentStoreRequest and NSPersistentStoreResult only.

pub unsafe fn insertObject(&self, object: &NSManagedObject)

Available on crate feature NSManagedObject only.

pub unsafe fn deleteObject(&self, object: &NSManagedObject)

Available on crate feature NSManagedObject only.

pub unsafe fn refreshObject_mergeChanges( &self, object: &NSManagedObject, flag: bool, )

Available on crate feature NSManagedObject only.

pub unsafe fn detectConflictsForObject(&self, object: &NSManagedObject)

Available on crate feature NSManagedObject only.

pub unsafe fn observeValueForKeyPath_ofObject_change_context( &self, key_path: Option<&NSString>, object: Option<&AnyObject>, change: Option<&NSDictionary<NSString, AnyObject>>, context: *mut c_void, )

Safety

• object should be of the correct type.
• change generic should be of the correct type.
• context must be a valid pointer or null.

pub unsafe fn processPendingChanges(&self)

pub unsafe fn assignObject_toPersistentStore( &self, object: &AnyObject, store: &NSPersistentStore, )

Available on crate feature NSPersistentStore only.

Safety

object should be of the correct type.

pub unsafe fn insertedObjects(&self) -> Retained<NSSet<NSManagedObject>>

Available on crate feature NSManagedObject only.

This property is not atomic.

Safety

This might not be thread-safe.

pub unsafe fn updatedObjects(&self) -> Retained<NSSet<NSManagedObject>>

Available on crate feature NSManagedObject only.

This property is not atomic.

Safety

This might not be thread-safe.

pub unsafe fn deletedObjects(&self) -> Retained<NSSet<NSManagedObject>>

Available on crate feature NSManagedObject only.

This property is not atomic.

Safety

This might not be thread-safe.

pub unsafe fn registeredObjects(&self) -> Retained<NSSet<NSManagedObject>>

Available on crate feature NSManagedObject only.

This property is not atomic.

Safety

This might not be thread-safe.

pub unsafe fn undo(&self)

pub unsafe fn redo(&self)

pub unsafe fn reset(&self)

pub unsafe fn rollback(&self)

pub unsafe fn save(&self) -> Result<(), Retained<NSError>>

pub unsafe fn refreshAllObjects(&self)

pub unsafe fn lock(&self)

👎Deprecated: Use a queue style context and -performBlockAndWait: instead

pub unsafe fn unlock(&self)

👎Deprecated: Use a queue style context and -performBlockAndWait: instead

pub unsafe fn tryLock(&self) -> bool

👎Deprecated: Use a queue style context and -performBlock: instead

pub unsafe fn propagatesDeletesAtEndOfEvent(&self) -> bool

This property is not atomic.

Safety

This might not be thread-safe.

pub unsafe fn setPropagatesDeletesAtEndOfEvent( &self, propagates_deletes_at_end_of_event: bool, )

Setter for propagatesDeletesAtEndOfEvent.

Safety

This might not be thread-safe.

pub unsafe fn retainsRegisteredObjects(&self) -> bool

This property is not atomic.

Safety

This might not be thread-safe.

pub unsafe fn setRetainsRegisteredObjects( &self, retains_registered_objects: bool, )

Setter for retainsRegisteredObjects.

Safety

This might not be thread-safe.

pub unsafe fn shouldDeleteInaccessibleFaults(&self) -> bool

pub unsafe fn setShouldDeleteInaccessibleFaults( &self, should_delete_inaccessible_faults: bool, )

Setter for shouldDeleteInaccessibleFaults.

pub unsafe fn shouldHandleInaccessibleFault_forObjectID_triggeredByProperty( &self, fault: &NSManagedObject, oid: &NSManagedObjectID, property: Option<&NSPropertyDescription>, ) -> bool

Available on crate features NSManagedObject and NSManagedObjectID and NSPropertyDescription only.

pub unsafe fn stalenessInterval(&self) -> NSTimeInterval

pub unsafe fn setStalenessInterval(&self, staleness_interval: NSTimeInterval)

Setter for stalenessInterval.

pub unsafe fn mergePolicy(&self) -> Retained<AnyObject>

pub unsafe fn setMergePolicy(&self, merge_policy: &AnyObject)

Setter for mergePolicy.

Safety

merge_policy should be of the correct type.

pub unsafe fn obtainPermanentIDsForObjects_error( &self, objects: &NSArray<NSManagedObject>, ) -> Result<(), Retained<NSError>>

Available on crate feature NSManagedObject only.

pub unsafe fn mergeChangesFromContextDidSaveNotification( &self, notification: &NSNotification, )

pub unsafe fn mergeChangesFromRemoteContextSave_intoContexts( change_notification_data: &NSDictionary, contexts: &NSArray<NSManagedObjectContext>, )

Safety

change_notification_data generic should be of the correct type.

pub unsafe fn queryGenerationToken( &self, ) -> Option<Retained<NSQueryGenerationToken>>

Available on crate feature NSQueryGenerationToken only.

This property is not atomic.

Safety

This might not be thread-safe.

pub unsafe fn setQueryGenerationFromToken_error( &self, generation: Option<&NSQueryGenerationToken>, ) -> Result<(), Retained<NSError>>

Available on crate feature NSQueryGenerationToken only.

pub unsafe fn automaticallyMergesChangesFromParent(&self) -> bool

This property is not atomic.

Safety

This might not be thread-safe.

pub unsafe fn setAutomaticallyMergesChangesFromParent( &self, automatically_merges_changes_from_parent: bool, )

Setter for automaticallyMergesChangesFromParent.

Safety

This might not be thread-safe.

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

pub unsafe fn setTransactionAuthor(&self, transaction_author: Option<&NSString>)

Setter for transactionAuthor.

This is copied when set.

Methods from Deref<Target = NSObject>

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

Handle messages the object doesn’t recognize.

See Apple’s documentation for details.

Methods from Deref<Target = AnyObject>

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());

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.

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`
    }
}

Trait Implementations

impl AsRef<AnyObject> for NSManagedObjectContext

fn as_ref(&self) -> &AnyObject

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<NSManagedObjectContext> for NSManagedObjectContext

fn as_ref(&self) -> &Self

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<NSObject> for NSManagedObjectContext

fn as_ref(&self) -> &NSObject

Converts this type into a shared reference of the (usually inferred) input type.

impl Borrow<AnyObject> for NSManagedObjectContext

fn borrow(&self) -> &AnyObject

Immutably borrows from an owned value.

impl Borrow<NSObject> for NSManagedObjectContext

fn borrow(&self) -> &NSObject

Immutably borrows from an owned value.

impl ClassType for NSManagedObjectContext

const NAME: &'static str = "NSManagedObjectContext"

The name of the Objective-C class that this type represents.

type Super = NSObject

The superclass of this class.

type ThreadKind = <<NSManagedObjectContext as ClassType>::Super as ClassType>::ThreadKind

Whether the type can be used from any thread, or from only the main thread.

fn class() -> &'static AnyClass

Get a reference to the Objective-C class that this type represents.

fn as_super(&self) -> &Self::Super

Get an immutable reference to the superclass.

impl Debug for NSManagedObjectContext

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Deref for NSManagedObjectContext

type Target = NSObject

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl Hash for NSManagedObjectContext

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Message for NSManagedObjectContext

fn retain(&self) -> Retained<Self>

where Self: Sized,

Increment the reference count of the receiver.

impl NSCoding for NSManagedObjectContext

unsafe fn encodeWithCoder(&self, coder: &NSCoder)

where Self: Sized + Message,

Safety

unsafe fn initWithCoder( this: Allocated<Self>, coder: &NSCoder, ) -> Option<Retained<Self>>

where Self: Sized + Message,

Safety

impl NSLocking for NSManagedObjectContext

unsafe fn lock(&self)

where Self: Sized + Message,

unsafe fn unlock(&self)

where Self: Sized + Message,

impl NSObjectProtocol for NSManagedObjectContext

fn isEqual(&self, other: Option<&AnyObject>) -> bool

where Self: Sized + Message,

Check whether the object is equal to an arbitrary other object.

fn hash(&self) -> usize

where Self: Sized + Message,

An integer that can be used as a table address in a hash table structure.

fn isKindOfClass(&self, cls: &AnyClass) -> bool

where Self: Sized + Message,

Check if the object is an instance of the class, or one of its subclasses.

fn is_kind_of<T>(&self) -> bool

where T: ClassType, Self: Sized + Message,

👎Deprecated: use isKindOfClass directly, or cast your objects with AnyObject::downcast_ref

Check if the object is an instance of the class type, or one of its subclasses.

fn isMemberOfClass(&self, cls: &AnyClass) -> bool

where Self: Sized + Message,

Check if the object is an instance of a specific class, without checking subclasses.

fn respondsToSelector(&self, aSelector: Sel) -> bool

where Self: Sized + Message,

Check whether the object implements or inherits a method with the given selector.

fn conformsToProtocol(&self, aProtocol: &AnyProtocol) -> bool

where Self: Sized + Message,

Check whether the object conforms to a given protocol.

fn description(&self) -> Retained<NSObject>

where Self: Sized + Message,

A textual representation of the object.

fn debugDescription(&self) -> Retained<NSObject>

where Self: Sized + Message,

A textual representation of the object to use when debugging.

fn isProxy(&self) -> bool

where Self: Sized + Message,

Check whether the receiver is a subclass of the NSProxy root class instead of the usual NSObject.

fn retainCount(&self) -> usize

where Self: Sized + Message,

The reference count of the object.

impl PartialEq for NSManagedObjectContext

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl RefEncode for NSManagedObjectContext

const ENCODING_REF: Encoding = <NSObject as ::objc2::RefEncode>::ENCODING_REF

The Objective-C type-encoding for a reference of this type.

impl DowncastTarget for NSManagedObjectContext

impl Eq for NSManagedObjectContext

impl Send for NSManagedObjectContext

impl Sync for NSManagedObjectContext