Struct CNChangeHistoryFetchRequest

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pub struct CNChangeHistoryFetchRequest { /* private fields */ }

Available on crate features CNChangeHistoryFetchRequest and CNFetchRequest only.

Expand description

Specifies the criteria to fetch change history.

Changes to contacts are always returned. All changes are coalesced to remove redundant adds, updates and deletes. This request is used with [CNContactStore enumeratorForChangeHistoryFetchRequest:error:].

Implementations§

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impl CNChangeHistoryFetchRequest

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

Request changes made after a certain point.

If non-nil, only changes made after this point in history will be returned.

If nil, a CNChangeHistoryDropEverythingEventwill be returned, followed by an add event for every contact and group currently in the contacts database.

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pub unsafe fn setStartingToken(&self, starting_token: Option<&NSData>)

Setter for startingToken.

This is copied when set.

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pub unsafe fn additionalContactKeyDescriptors( &self, ) -> Option<Retained<NSArray<ProtocolObject<dyn CNKeyDescriptor>>>>

Available on crate feature CNContact only.

Additional keys to include in the fetched contacts.

By default, only CNContactIdentifierKeywill be fetched. If you would like to include additional key descriptors to process the contacts, include the key descriptors you need.

CNContactIdentifierKeywill always be fetched, whether you request it or not.

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pub unsafe fn setAdditionalContactKeyDescriptors( &self, additional_contact_key_descriptors: Option<&NSArray<ProtocolObject<dyn CNKeyDescriptor>>>, )

Available on crate feature CNContact only.

Setter for additionalContactKeyDescriptors.

This is copied when set.

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pub unsafe fn shouldUnifyResults(&self) -> bool

Returns contact changes as unified contacts.

If YES,returns unified contact history. Otherwise returns individual contact history. Default is YES.

Note: A unified contact is the aggregation of properties from a set of linked individual contacts. If an individual contact is not linked then the unified contact is simply that individual contact.

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pub unsafe fn setShouldUnifyResults(&self, should_unify_results: bool)

Setter for shouldUnifyResults.

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pub unsafe fn mutableObjects(&self) -> bool

To return mutable contacts and groups.

If YESreturns mutable contacts and groups. Default is NO.

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pub unsafe fn setMutableObjects(&self, mutable_objects: bool)

Setter for mutableObjects.

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pub unsafe fn includeGroupChanges(&self) -> bool

Set to YESto also fetch group changes. Default is NO.

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pub unsafe fn setIncludeGroupChanges(&self, include_group_changes: bool)

Setter for includeGroupChanges.

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pub unsafe fn excludedTransactionAuthors( &self, ) -> Option<Retained<NSArray<NSString>>>

Exclude changes made by certain authors.

If set, transactions made by the specified authors will be excluded from the results. Use this, in conjunction with CNSaveRequest.transactionAuthor,to suppress processing of changes you already know about.

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pub unsafe fn setExcludedTransactionAuthors( &self, excluded_transaction_authors: Option<&NSArray<NSString>>, )

Setter for excludedTransactionAuthors.

This is copied when set.

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impl CNChangeHistoryFetchRequest

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.

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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`
    }
}