Struct AVFragmentedAssetMinder

Source

pub struct AVFragmentedAssetMinder { /* private fields */ }

Available on crate feature AVAsset only.

Expand description

A class that periodically checks whether additional fragments have been appended to fragmented assets.

Implementations§

Source §

impl AVFragmentedAssetMinder

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pub unsafe fn fragmentedAssetMinderWithAsset_mindingInterval( asset: &AVAsset, minding_interval: NSTimeInterval, ) -> Retained<Self>

Creates an AVFragmentedAssetMinder, adds the specified asset to it, and sets the mindingInterval to the specified value.

Parameter asset: An instance of AVFragmentedAsset to add to the AVFragmentedAssetMinder
Parameter mindingInterval: The initial minding interval of the AVFragmentedAssetMinder.
Returns: A new instance of AVFragmentedAssetMinder.

§Safety

asset must implement AVFragmentMinding.

Source

pub unsafe fn initWithAsset_mindingInterval( this: Allocated<Self>, asset: &AVAsset, minding_interval: NSTimeInterval, ) -> Retained<Self>

Creates an AVFragmentedAssetMinder, adds the specified asset to it, and sets the mindingInterval to the specified value.

Parameter asset: An instance of AVFragmentedAsset to add to the AVFragmentedAssetMinder
Parameter mindingInterval: The initial minding interval of the AVFragmentedAssetMinder.
Returns: A new instance of AVFragmentedAssetMinder.

§Safety

asset must implement AVFragmentMinding.

Source

pub unsafe fn mindingInterval(&self) -> NSTimeInterval

An NSTimeInterval indicating how often a check for additional fragments should be performed. The default interval is 10.0.

This property throws an excepion if a value is set less than one millisecond (0.001) in duration.

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pub unsafe fn setMindingInterval(&self, minding_interval: NSTimeInterval)

Setter for mindingInterval.

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pub unsafe fn assets(&self) -> Retained<NSArray<AVAsset>>

An NSArray of the AVFragmentedAsset objects being minded.

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pub unsafe fn addFragmentedAsset(&self, asset: &AVAsset)

Adds a fragmented asset to the array of assets being minded.

This method throws an exception if the asset is not a supported type (AVFragmentedAsset, AVFragmentedMovie), or if the asset is already being minded by another fragment minder.

Parameter asset: The fragmented asset to add to the minder.

§Safety

asset must implement AVFragmentMinding.

Source

pub unsafe fn removeFragmentedAsset(&self, asset: &AVAsset)

Removes a fragmented asset from the array of assets being minded.

This method throws an exception if the asset is not a supported type (AVFragmentedAsset, AVFragmentedMovie).

Parameter asset: The fragmented asset to remove from the minder.

§Safety

asset must implement AVFragmentMinding.

Source §

impl AVFragmentedAssetMinder

Methods declared on superclass NSObject.

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

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

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`
    }
}