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