[IOS] Use nsproxy to implement proxy Mode

// Myproxy. h

# Import
<Foundation/Foundation. h>

@ Interface myproxy:
Nsproxy {

Nsobject * object;

}

-(ID) transformtoobject :( nsobject *) anobject;

@ End

// Myproxy. m

# Import
"Myproxy. H"

@ Implementation myproxy

-(Void) dealloc

{

[Object
Release];

Object = nil;

[Super
Dealloc];

}

-(Void) Fun

{

// Do someting virtual

//
First do some proxy work, then create a background thread, and then call the real [object fun] In the background thread;

}

// Stupid transform implementation just by assigning a passed in object as transformation target. You can write your factory here and use passed in object as ID for object that need
Ot be created.

-(ID) transformtoobject :( nsobject *) anobject

{

If (object! = Anobject ){

[Object
Release];

}

Object = [anobject retain];

Return object;

}

-(Void) forwardinvocation :( nsinvocation *) Invocation

{

If (object! =
Nil ){

[Invocation
Settarget: object];

[Invocation
Invoke];

}

}

-(Nsmethodsignature *) methodsignatureforselector :( SEL) SEL

{

Nsmethodsignature * result;

If (object! =
Nil ){

Result = [Object
Methodsignatureforselector: sel];

}
Else {

// Will throw an exception as default implementation

Result = [Super
Methodsignatureforselector: sel];

}

Return result;

}

@ End

// Realsubject. h

# Import
<Foundation/Foundation. h>

@ Implementation realsubject: nsobject

-(Void) fun;

@ End

// Realsubject. m

# Import
"Realsubject. H"

@ Implementation realsubject

-(Void) Fun

{

//
This method requires a proxy to call the API.

// Do something real

}

-(Void) otherfun

{

//
This method can be called directly without any processing by the proxy.

// Do something real

}

@ End

// Main. m

Int main (INT argc,
Char * argv [])

{

NSAID utoreleasepool * Pool = [[NSAID utoreleasepool
Alloc]
Init];

Myproxy * myproxy = [myproxy
Alloc];

Realsubject * realsub = [[realsubject
Alloc] init];

[Myproxy
Transformtoobject: realsub];

[Myproxy
Fun];
// Directly call myproxy's fun to execute proxy work

[Myproxy
Otherfun];
// Call methodsignatureforselector and forwardinvocation of myproxy in sequence and forward them to realsub. realsub calls otherfun.

[Realsubject
Release];

[Myproxy
Release];

[Pool
Release];

Return 0;

}

Note: When you call an undefined method in myproxy, otherfun will receive a warning that 'myproxy' may not respond to 'fun ', which can be avoided by using a private category or using javasmselector: withobject, please let us know if there is a better method.