45 lines
1.2 KiB
Rust
45 lines
1.2 KiB
Rust
#[macro_use]
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extern crate objc;
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use objc::Encode;
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use objc::rc::StrongPtr;
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use objc::runtime::{Class, Object};
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fn main() {
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// Get a class
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let cls = class!(NSObject);
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println!("NSObject size: {}", cls.instance_size());
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// Inspect its ivars
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println!("NSObject ivars:");
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for ivar in cls.instance_variables().iter() {
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println!("{}", ivar.name());
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}
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// Allocate an instance
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let obj = unsafe {
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let obj: *mut Object = msg_send![cls, alloc];
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let obj: *mut Object = msg_send![obj, init];
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StrongPtr::new(obj)
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};
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println!("NSObject address: {:p}", obj);
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// Access an ivar of the object
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let isa: *const Class = unsafe {
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*(**obj).get_ivar("isa")
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};
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println!("NSObject isa: {:?}", isa);
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// Inspect a method of the class
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let hash_sel = sel!(hash);
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let hash_method = cls.instance_method(hash_sel).unwrap();
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let hash_return = hash_method.return_type();
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println!("-[NSObject hash] return type: {:?}", hash_return);
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assert!(hash_return == usize::encode());
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// Invoke a method on the object
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let hash: usize = unsafe {
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msg_send![*obj, hash]
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};
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println!("NSObject hash: {}", hash);
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}
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