Swift和OC混编

#import <Foundation/Foundation.h>

@interface HelloOC : NSObject

- (void)sayHelloWorld;

@end

#import "HelloOC.h"

@implementation HelloOC

- (void)sayHelloWorld
{
    NSLog(@"Hello World!");
}

@end

#import "HelloOC.h"     //在swift文件中调用OC对象,需要导入

import Foundation

var hello = HelloOC()
hello.sayHelloWorld()

import Foundation

class HelloSwift: NSObject {
    
    func sayHello()
    {
        println("Swift Hello")
    }
}

#import <Foundation/Foundation.h>

@class HelloSwift;

@interface HelloOC : NSObject
{
    HelloSwift *swift;
}

- (void)sayHelloWorld;

@end

#import "HelloOC.h"
#import "OCSwift-Swift.h"

@implementation HelloOC

- (id)init
{
    if (self = [super init]) {
        swift = [[HelloSwift alloc] init];
    }
    return self;
}

- (void)sayHelloWorld
{
    NSLog(@"Hello World!");
    [swift sayHello];
}

@end