Trait VNRequestProgressProviding 

pub unsafe trait VNRequestProgressProviding: NSObjectProtocol {
    // Provided methods
    unsafe fn progressHandler(&self) -> VNRequestProgressHandler
       where Self: Sized + Message { ... }
    unsafe fn setProgressHandler(
        &self,
        progress_handler: VNRequestProgressHandler,
    )
       where Self: Sized + Message { ... }
    unsafe fn indeterminate(&self) -> bool
       where Self: Sized + Message { ... }
}

Available on crate feature VNRequest only.

Apple’s documentation

Provided Methods

unsafe fn progressHandler(&self) -> VNRequestProgressHandler

where Self: Sized + Message,

Available on crate feature block2 only.

Requests that support the VNRequestProgressProviding protocol would periodically call the progressHandler to report progress on longer running tasks.

The progessHandler is optional allowing clients of the request to report progress to the user and/or display or process partial results when they become available. Note that the progressHandler can be called on a different dispatch queue than what the request was initiated from.

Safety

• The returned block’s argument 1 must be a valid pointer.
• The returned block’s argument 3 must be a valid pointer or null.

unsafe fn setProgressHandler(&self, progress_handler: VNRequestProgressHandler)

where Self: Sized + Message,

Available on crate feature block2 only.

Setter for progressHandler.

This is copied when set.

Safety

progress_handler must be a valid pointer.

unsafe fn indeterminate(&self) -> bool

where Self: Sized + Message,

If a request cannot determine its progress in fractions completed, this property will be set.

If this is set, it doesn’t mean that the request will run forever just that the nature of the request is not broken down into identifiable fractions on which progress can be reported in increments. The progressHandler will nonetheless be called at suitable intervals.

Trait Implementations

impl ProtocolType for dyn VNRequestProgressProviding

const NAME: &'static str = "VNRequestProgressProviding"

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

fn protocol() -> Option<&'static AnyProtocol>

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

impl<T> ImplementedBy<T> for dyn VNRequestProgressProviding

where T: ?Sized + Message + VNRequestProgressProviding,

Implementations on Foreign Types

impl<T> VNRequestProgressProviding for ProtocolObject<T>

where T: ?Sized + VNRequestProgressProviding,

Implementors

impl VNRequestProgressProviding for VNRecognizeTextRequest

Available on crate feature VNRecognizeTextRequest only.