Is it possible to cast "AnyObject" to a swift struct

Question

I have a swift method which receives a struct as a parameter. Since the structs aren't bridged to objective-c, this method is invisible in the bridging header.
I was forced to created a new "identical" method that receives "AnyObject" instead of the struct the original method required.

Now I am tasked with instantiating the swift structs from "AnyObject". Is it possible to "cast" the "AnyObject" to a swift struct in this case?

Am I forced to write boiler plate to construct a swift struct from the AnyObject?

I can send an NSDictionary representing the structs key-value pairs. Does this help in any way?

For instance :

Swift

struct Properties {
  var color = UIColor.redColor()
  var text = "Some text" 
}

class SomeClass : UIViewController {
  func configure(options : Properties) {
    // the original method 
    // not visible from 
  }
  func wrapObjC_Configure(options : AnyObject) {
    // Visible to objective-c
    var convertedStruct = (options as Properties) // cast to the swift struct
    self.configure(convertedStruct)
  }
}

Objective-c

SomeClass *obj = [SomeClass new]
[obj wrapObjC_Configure:@{@"color" : [UIColor redColor],@"text" : @"Some text"}]

How would that help in casting to a swift struct from an objective-c call? — Avba, Apr 28 '15 at 13:33
AnyObject is a protocol that applies to classes, not structs. It helps over `@objc` — qwerty_so, Apr 28 '15 at 13:34
Can you just make `Properties` be a `class` instead of a `struct`? Then you'd be able to use if from Objective-C. — vacawama, Apr 28 '15 at 13:36
I don't want it to be a class - I want it to be a struct - this is a contrived example — Avba, Apr 28 '15 at 13:37

score 1 · Answer 1 · answered Nov 05 '15 at 14:23

You could use NSValue and contain your struct in it, send NSValue and then get the struct value from it,

sample category for NSValue would be:

@interface NSValue (Properties)
+ (instancetype)valuewithProperties:(Properties)value;
@property (readonly) Properties propertiesValue;
@end

@implementation NSValue (Properties)
+ (instancetype)valuewithProperties:(Properties)value
{
    return [self valueWithBytes:&value objCType:@encode(Properties)];
}
- (Properties) propertiesValue
{
    Properties value;
    [self getValue:&value];
    return value;
}
@end

More about NSValue here - https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSValue_Class/

score 0 · Answer 2 · answered Apr 28 '15 at 13:35

0

You can't use anyObject to represent structs. You can only use AnyObject with class instances.

You can try your chance with Any, which can represent any type of instances including function types.

answered Apr 28 '15 at 13:35

Salihcyilmaz

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You can't bridge "Any" to objective-C – Avba Apr 28 '15 at 13:36

Is it possible to cast "AnyObject" to a swift struct

2 Answers2