Struct NSObjectController

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

Available on crate features NSController and NSObjectController only.

Expand description

Apple’s documentation

Implementations§

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impl NSObjectController

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pub unsafe fn initWithContent( this: Allocated<Self>, content: Option<&AnyObject>, ) -> Retained<Self>

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

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

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pub unsafe fn setContent(&self, content: Option<&AnyObject>)

Setter for content.

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pub unsafe fn setAutomaticallyPreparesContent( &self, automatically_prepares_content: bool, )

Setter for automaticallyPreparesContent.

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pub unsafe fn prepareContent(&self)

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pub unsafe fn objectClass(&self) -> Option<&'static AnyClass>

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pub unsafe fn setObjectClass(&self, object_class: Option<&AnyClass>)

Setter for objectClass.

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

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pub unsafe fn addObject(&self, object: &AnyObject)

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pub unsafe fn removeObject(&self, object: &AnyObject)

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pub unsafe fn isEditable(&self) -> bool

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pub unsafe fn setEditable(&self, editable: bool)

Setter for isEditable.

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pub unsafe fn add(&self, sender: Option<&AnyObject>)

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pub unsafe fn canAdd(&self) -> bool

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pub unsafe fn remove(&self, sender: Option<&AnyObject>)

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pub unsafe fn canRemove(&self) -> bool

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pub unsafe fn validateUserInterfaceItem( &self, item: &ProtocolObject<dyn NSValidatedUserInterfaceItem>, ) -> bool

Available on crate feature NSUserInterfaceValidation only.

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impl NSObjectController

Methods declared on superclass NSController.

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

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impl NSObjectController

Methods declared on superclass NSObject.

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pub unsafe fn new(mtm: MainThreadMarker) -> Retained<Self>

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impl NSObjectController

NSManagedController.

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

Available on crate feature objc2-core-data and Apple only.

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pub unsafe fn setManagedObjectContext( &self, managed_object_context: Option<&NSManagedObjectContext>, )

Available on crate feature objc2-core-data and Apple only.

Setter for managedObjectContext.

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

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pub unsafe fn setEntityName(&self, entity_name: Option<&NSString>)

Setter for entityName.

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pub unsafe fn fetchPredicate(&self) -> Option<Retained<NSPredicate>>

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pub unsafe fn setFetchPredicate(&self, fetch_predicate: Option<&NSPredicate>)

Setter for fetchPredicate.

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pub unsafe fn fetchWithRequest_merge_error( &self, fetch_request: Option<&NSFetchRequest>, merge: bool, ) -> Result<(), Retained<NSError>>

Available on crate feature objc2-core-data and Apple only.

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pub unsafe fn fetch(&self, sender: Option<&AnyObject>)

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pub unsafe fn usesLazyFetching(&self) -> bool

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pub unsafe fn setUsesLazyFetching(&self, uses_lazy_fetching: bool)

Setter for usesLazyFetching.

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pub unsafe fn defaultFetchRequest(&self) -> Retained<NSFetchRequest>

Available on crate feature objc2-core-data and Apple only.

Methods from Deref<Target = NSController>§

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pub unsafe fn objectDidBeginEditing( &self, editor: &ProtocolObject<dyn NSEditor>, )

Available on crate feature NSKeyValueBinding only.

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pub unsafe fn objectDidEndEditing(&self, editor: &ProtocolObject<dyn NSEditor>)

Available on crate feature NSKeyValueBinding only.

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pub unsafe fn discardEditing(&self)

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pub unsafe fn commitEditing(&self) -> bool

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pub unsafe fn commitEditingWithDelegate_didCommitSelector_contextInfo( &self, delegate: Option<&AnyObject>, did_commit_selector: Option<Sel>, context_info: *mut c_void, )

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pub unsafe fn isEditing(&self) -> bool

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

Available on crate feature NSAccessibilityConstants only.

Dynamically find the class of this object.

§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.

Available on crate feature NSAccessibilityConstants only.

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.

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

Available on crate feature NSAccessibilityConstants only.

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`
    }
}