Struct WebHistory

Source

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

👎Deprecated

Available on crate feature WebHistory only.

Expand description

WebHistory is used to track pages that have been loaded by WebKit.

Implementations§

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impl WebHistory

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pub unsafe fn optionalSharedHistory() -> Option<Retained<WebHistory>>

👎Deprecated

Returns a shared WebHistory instance initialized with the default history file.

Returns: A WebHistory object.

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pub unsafe fn setOptionalSharedHistory(history: Option<&WebHistory>)

👎Deprecated

Parameter history: The history to use for the global WebHistory.

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pub unsafe fn addItems(&self, new_items: Option<&NSArray>)

👎Deprecated

Parameter newItems: An array of WebHistoryItems to add to the WebHistory.

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pub unsafe fn removeItems(&self, items: Option<&NSArray>)

👎Deprecated

Parameter items: An array of WebHistoryItems to remove from the WebHistory.

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pub unsafe fn removeAllItems(&self)

👎Deprecated

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

👎Deprecated

An array of NSCalendarDates for which history items exist in the WebHistory.

An array of NSCalendarDates, each one representing a unique day that contains one or more history items, ordered from most recent to oldest.

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pub unsafe fn orderedItemsLastVisitedOnDay( &self, calendar_date: Option<&NSCalendarDate>, ) -> Option<Retained<NSArray>>

👎Deprecated

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pub unsafe fn itemForURL( &self, url: Option<&NSURL>, ) -> Option<Retained<WebHistoryItem>>

👎Deprecated

Available on crate feature WebHistoryItem only.

Get an item for a specific URL

Parameter URL: The URL of the history item to search for

Returns: Returns an item matching the URL

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pub unsafe fn historyItemLimit(&self) -> c_int

👎Deprecated

The maximum number of items that will be stored by the WebHistory.

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pub unsafe fn setHistoryItemLimit(&self, history_item_limit: c_int)

👎Deprecated

Setter for historyItemLimit.

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pub unsafe fn historyAgeInDaysLimit(&self) -> c_int

👎Deprecated

The maximum number of days to be read from stored history.

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pub unsafe fn setHistoryAgeInDaysLimit(&self, history_age_in_days_limit: c_int)

👎Deprecated

Setter for historyAgeInDaysLimit.

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impl WebHistory

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.

§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.

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,

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`
    }
}