Struct AVMutableMetadataItem

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

Available on crate feature AVMetadataItem only.

Apple’s documentation

Implementations

impl AVMutableMetadataItem

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

Available on crate feature AVMetadataIdentifiers only.

pub unsafe fn setIdentifier(&self, identifier: Option<&AVMetadataIdentifier>)

Available on crate feature AVMetadataIdentifiers only.

Setter for identifier.

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

pub unsafe fn setExtendedLanguageTag( &self, extended_language_tag: Option<&NSString>, )

Setter for extendedLanguageTag.

pub unsafe fn locale(&self) -> Option<Retained<NSLocale>>

pub unsafe fn setLocale(&self, locale: Option<&NSLocale>)

Setter for locale.

pub unsafe fn time(&self) -> CMTime

Available on crate feature objc2-core-media only.

pub unsafe fn setTime(&self, time: CMTime)

Available on crate feature objc2-core-media only.

Setter for time.

pub unsafe fn duration(&self) -> CMTime

Available on crate feature objc2-core-media only.

pub unsafe fn setDuration(&self, duration: CMTime)

Available on crate feature objc2-core-media only.

Setter for duration.

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

pub unsafe fn setDataType(&self, data_type: Option<&NSString>)

Setter for dataType.

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

pub unsafe fn setValue(&self, value: Option<&AnyObject>)

Setter for value.

pub unsafe fn extraAttributes( &self, ) -> Option<Retained<NSDictionary<AVMetadataExtraAttributeKey, AnyObject>>>

Available on crate feature AVMetadataFormat only.

pub unsafe fn setExtraAttributes( &self, extra_attributes: Option<&NSDictionary<AVMetadataExtraAttributeKey, AnyObject>>, )

Available on crate feature AVMetadataFormat only.

Setter for extraAttributes.

pub unsafe fn metadataItem() -> Retained<AVMutableMetadataItem>

Returns an instance of AVMutableMetadataItem.

impl AVMutableMetadataItem

Methods declared on superclass NSObject.

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

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

impl AVMutableMetadataItem

AVMutableMetadataItemDateRepresentation.

pub unsafe fn startDate(&self) -> Option<Retained<NSDate>>

pub unsafe fn setStartDate(&self, start_date: Option<&NSDate>)

Setter for startDate.

impl AVMutableMetadataItem

AVMutableMetadataItemKeyAndKeyspace.

pub unsafe fn keySpace(&self) -> Option<Retained<AVMetadataKeySpace>>

Available on crate feature AVMetadataFormat only.

pub unsafe fn setKeySpace(&self, key_space: Option<&AVMetadataKeySpace>)

Available on crate feature AVMetadataFormat only.

Setter for keySpace.

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

pub unsafe fn setKey(&self, key: Option<&AnyObject>)

Setter for key.

impl AVMutableMetadataItem

SynchronousMetadataItemInterface. Redeclarations of async-only AVMetadataItem interfaces to allow synchronous usage in the mutable subclass.

This impl block contains no items.

See AVMetadataItem’s interface for more information about these interfaces.

Methods from Deref<Target = AVMetadataItem>

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

Available on crate feature AVMetadataIdentifiers only.

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

pub unsafe fn locale(&self) -> Option<Retained<NSLocale>>

pub unsafe fn time(&self) -> CMTime

Available on crate feature objc2-core-media only.

pub unsafe fn duration(&self) -> CMTime

Available on crate feature objc2-core-media only.

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

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

pub unsafe fn extraAttributes( &self, ) -> Option<Retained<NSDictionary<AVMetadataExtraAttributeKey, AnyObject>>>

Available on crate feature AVMetadataFormat only.

pub unsafe fn startDate(&self) -> Option<Retained<NSDate>>

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

pub unsafe fn numberValue(&self) -> Option<Retained<NSNumber>>

pub unsafe fn dateValue(&self) -> Option<Retained<NSDate>>

pub unsafe fn dataValue(&self) -> Option<Retained<NSData>>

pub unsafe fn loadValuesAsynchronouslyForKeys_completionHandler( &self, keys: &NSArray<NSString>, handler: Option<&Block<dyn Fn()>>, )

Available on crate feature block2 only.

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

pub unsafe fn commonKey(&self) -> Option<Retained<AVMetadataKey>>

Available on crate feature AVMetadataFormat only.

pub unsafe fn keySpace(&self) -> Option<Retained<AVMetadataKeySpace>>

Available on crate feature AVMetadataFormat only.

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.

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 AVAsynchronousKeyValueLoading for AVMutableMetadataItem

Available on crate feature AVAsynchronousKeyValueLoading only.

unsafe fn loadValuesAsynchronouslyForKeys_completionHandler( &self, keys: &NSArray<NSString>, handler: Option<&Block<dyn Fn()>>, )

where Self: Sized + Message,

Available on crate feature block2 only.

Directs the target to load the values of any of the specified keys that are not already loaded.

impl AsRef<AVMetadataItem> for AVMutableMetadataItem

fn as_ref(&self) -> &AVMetadataItem

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

impl AsRef<AVMutableMetadataItem> for AVMutableMetadataItem

fn as_ref(&self) -> &Self

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

impl AsRef<AnyObject> for AVMutableMetadataItem

fn as_ref(&self) -> &AnyObject

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

impl AsRef<NSObject> for AVMutableMetadataItem

fn as_ref(&self) -> &NSObject

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

impl Borrow<AVMetadataItem> for AVMutableMetadataItem

fn borrow(&self) -> &AVMetadataItem

Immutably borrows from an owned value.

impl Borrow<AnyObject> for AVMutableMetadataItem

fn borrow(&self) -> &AnyObject

Immutably borrows from an owned value.

impl Borrow<NSObject> for AVMutableMetadataItem

fn borrow(&self) -> &NSObject

Immutably borrows from an owned value.

impl ClassType for AVMutableMetadataItem

const NAME: &'static str = "AVMutableMetadataItem"

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

type Super = AVMetadataItem

The superclass of this class.

type ThreadKind = <<AVMutableMetadataItem 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 CopyingHelper for AVMutableMetadataItem

type Result = AVMetadataItem

The immutable counterpart of the type, or Self if the type has no immutable counterpart.

impl Debug for AVMutableMetadataItem

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

Formats the value using the given formatter.

impl Deref for AVMutableMetadataItem

type Target = AVMetadataItem

The resulting type after dereferencing.

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

Dereferences the value.

impl Hash for AVMutableMetadataItem

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 AVMutableMetadataItem

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

where Self: Sized,

Increment the reference count of the receiver.

impl MutableCopyingHelper for AVMutableMetadataItem

type Result = AVMutableMetadataItem

The mutable counterpart of the type, or Self if the type has no mutable counterpart.

impl NSCopying for AVMutableMetadataItem

fn copy(&self) -> Retained<Self::Result>

where Self: Sized + Message + CopyingHelper,

Returns a new instance that’s a copy of the receiver.

unsafe fn copyWithZone(&self, zone: *mut NSZone) -> Retained<Self::Result>

where Self: Sized + Message + CopyingHelper,

Returns a new instance that’s a copy of the receiver.

impl NSMutableCopying for AVMutableMetadataItem

fn mutableCopy(&self) -> Retained<Self::Result>

where Self: Sized + Message + MutableCopyingHelper,

Returns a new instance that’s a mutable copy of the receiver.

unsafe fn mutableCopyWithZone( &self, zone: *mut NSZone, ) -> Retained<Self::Result>

where Self: Sized + Message + MutableCopyingHelper,

Returns a new instance that’s a mutable copy of the receiver.

impl NSObjectProtocol for AVMutableMetadataItem

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 AVMutableMetadataItem

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 AVMutableMetadataItem

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

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

impl DowncastTarget for AVMutableMetadataItem

impl Eq for AVMutableMetadataItem