Struct NEFilterSettings

Source

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

Expand description

The NEFilterSettings class declares the programmatic interface for an object that contains filter settings.

NEFilterSettings is used by NEFilterDataProviders to communicate the desired settings for the filter to the framework. The framework takes care of applying the contained settings to the system.

Implementations§

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impl NEFilterSettings

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pub unsafe fn initWithRules_defaultAction( this: Allocated<Self>, rules: &NSArray<NEFilterRule>, default_action: NEFilterAction, ) -> Retained<Self>

Initialize a newly-allocated NEFilterSettings object with a set of filtering rules and a default filter action to takke if none of the rules match.

Parameter rules: An NSArray containing an ordered list of NEFilterRule objects. The maximum number of rules that this array can contain is 1000.

Parameter defaultAction: The NEFilterAction to take for flows of network (non-loopback) data that do not match any of the specified rules. The default defaultAction is NEFilterActionFilterData. If defaultAction is NEFilterActionAllow or NEFilterActionDrop, then the rules array must contain at least one NEFilterRule. The default action for loopback traffic is NEFilterActionAllow and cannot be changed. To filter loopback traffic you must include rules in the rules array that specifically match loopback traffic and have an action of NEFilterActionFilterData.

Returns: the newly-initialized NEFilterSettings object.

Source

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

An NSArray containing an ordered list of NEFilterRuleObjects. After the NEFilterSettings are applied to the system, each network flow is matched against these rules in order, and the NEFilterAction of the first rule that matches is taken: NEFilterActionAllow: Allow the flow of data to proceed on its journey through the networking stack without consulting this provider. NEFilterActionDrop: Drop the flow without consulting this provider. NEFilterActionFilterData: Call this provider’s handleNewFlow: method with the flow.

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pub unsafe fn defaultAction(&self) -> NEFilterAction

An NEFilterAction containing the default action to take for flows of network data that do not match any of the specified rules.

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impl NEFilterSettings

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());

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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.

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`
    }
}