#[repr(C)]pub struct NSUnitMass { /* private fields */ }
NSUnit
only.Expand description
Implementations§
Source§impl NSUnitMass
impl NSUnitMass
pub unsafe fn kilograms() -> Retained<NSUnitMass>
pub unsafe fn grams() -> Retained<NSUnitMass>
pub unsafe fn decigrams() -> Retained<NSUnitMass>
pub unsafe fn centigrams() -> Retained<NSUnitMass>
pub unsafe fn milligrams() -> Retained<NSUnitMass>
pub unsafe fn micrograms() -> Retained<NSUnitMass>
pub unsafe fn nanograms() -> Retained<NSUnitMass>
pub unsafe fn picograms() -> Retained<NSUnitMass>
pub unsafe fn ounces() -> Retained<NSUnitMass>
pub unsafe fn poundsMass() -> Retained<NSUnitMass>
pub unsafe fn stones() -> Retained<NSUnitMass>
pub unsafe fn metricTons() -> Retained<NSUnitMass>
pub unsafe fn shortTons() -> Retained<NSUnitMass>
pub unsafe fn carats() -> Retained<NSUnitMass>
pub unsafe fn ouncesTroy() -> Retained<NSUnitMass>
pub unsafe fn slugs() -> Retained<NSUnitMass>
Source§impl NSUnitMass
Methods declared on superclass NSDimension
.
impl NSUnitMass
Methods declared on superclass NSDimension
.
pub unsafe fn initWithSymbol_converter( this: Allocated<Self>, symbol: &NSString, converter: &NSUnitConverter, ) -> Retained<Self>
NSString
only.pub unsafe fn baseUnit() -> Retained<Self>
Source§impl NSUnitMass
Methods declared on superclass NSUnit
.
impl NSUnitMass
Methods declared on superclass NSUnit
.
Methods from Deref<Target = NSDimension>§
pub unsafe fn converter(&self) -> Retained<NSUnitConverter>
Methods from Deref<Target = NSObject>§
Sourcepub fn doesNotRecognizeSelector(&self, sel: Sel) -> !
pub fn doesNotRecognizeSelector(&self, sel: Sel) -> !
Handle messages the object doesn’t recognize.
See Apple’s documentation for details.
Methods from Deref<Target = AnyObject>§
Sourcepub fn class(&self) -> &'static AnyClass
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());
Sourcepub unsafe fn get_ivar<T>(&self, name: &str) -> &Twhere
T: Encode,
👎Deprecated: this is difficult to use correctly, use Ivar::load
instead.
pub unsafe fn get_ivar<T>(&self, name: &str) -> &Twhere
T: Encode,
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.
Sourcepub fn downcast_ref<T>(&self) -> Option<&T>where
T: DowncastTarget,
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`
}
}
Trait Implementations§
Source§impl AsRef<AnyObject> for NSUnitMass
impl AsRef<AnyObject> for NSUnitMass
Source§impl AsRef<NSDimension> for NSUnitMass
impl AsRef<NSDimension> for NSUnitMass
Source§fn as_ref(&self) -> &NSDimension
fn as_ref(&self) -> &NSDimension
Source§impl AsRef<NSObject> for NSUnitMass
impl AsRef<NSObject> for NSUnitMass
Source§impl AsRef<NSUnit> for NSUnitMass
impl AsRef<NSUnit> for NSUnitMass
Source§impl AsRef<NSUnitMass> for NSUnitMass
impl AsRef<NSUnitMass> for NSUnitMass
Source§impl Borrow<AnyObject> for NSUnitMass
impl Borrow<AnyObject> for NSUnitMass
Source§impl Borrow<NSDimension> for NSUnitMass
impl Borrow<NSDimension> for NSUnitMass
Source§fn borrow(&self) -> &NSDimension
fn borrow(&self) -> &NSDimension
Source§impl Borrow<NSObject> for NSUnitMass
impl Borrow<NSObject> for NSUnitMass
Source§impl Borrow<NSUnit> for NSUnitMass
impl Borrow<NSUnit> for NSUnitMass
Source§impl ClassType for NSUnitMass
impl ClassType for NSUnitMass
Source§const NAME: &'static str = "NSUnitMass"
const NAME: &'static str = "NSUnitMass"
Source§type Super = NSDimension
type Super = NSDimension
Source§type ThreadKind = <<NSUnitMass as ClassType>::Super as ClassType>::ThreadKind
type ThreadKind = <<NSUnitMass as ClassType>::Super as ClassType>::ThreadKind
Source§impl CopyingHelper for NSUnitMass
Available on crate feature NSObject
only.
impl CopyingHelper for NSUnitMass
NSObject
only.Source§type Result = NSUnitMass
type Result = NSUnitMass
Self
if the type has no
immutable counterpart. Read moreSource§impl Debug for NSUnitMass
impl Debug for NSUnitMass
Source§impl Deref for NSUnitMass
impl Deref for NSUnitMass
Source§impl Hash for NSUnitMass
impl Hash for NSUnitMass
Source§impl Message for NSUnitMass
impl Message for NSUnitMass
Source§impl NSCoding for NSUnitMass
impl NSCoding for NSUnitMass
Source§unsafe fn encodeWithCoder(&self, coder: &NSCoder)
unsafe fn encodeWithCoder(&self, coder: &NSCoder)
NSObject
and NSCoder
only.Source§impl NSCopying for NSUnitMass
impl NSCopying for NSUnitMass
Source§impl NSObjectProtocol for NSUnitMass
impl NSObjectProtocol for NSUnitMass
Source§fn isEqual(&self, other: Option<&AnyObject>) -> bool
fn isEqual(&self, other: Option<&AnyObject>) -> bool
Source§fn hash(&self) -> usize
fn hash(&self) -> usize
Source§fn isKindOfClass(&self, cls: &AnyClass) -> bool
fn isKindOfClass(&self, cls: &AnyClass) -> bool
Source§fn is_kind_of<T>(&self) -> bool
fn is_kind_of<T>(&self) -> bool
isKindOfClass
directly, or cast your objects with AnyObject::downcast_ref