OC项目中调用Swift

方法很简单但是网上资料比较乱，这边稍微整理一下

import "ProjectName-Swift.h"

在需要调用的文件中导入以上头文件，格式为项目名称+Swift.h

#import "BUICardDemo-Swift.h"//工程名为BUICardDemo
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(0, 100, 100, 50)];
    [btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
    btn.backgroundColor = [UIColor redColor];
    [self.view addSubview:btn];
    
    
}

-(void)btnClick
{
//swift VC OC中调用
    CusViewController *cusVC = [[CusViewController alloc]init];
    [self presentViewController:cusVC animated:true completion:nil];
}


@end

另外多一句就是swift想要在OC中调用就必须跟NSObject直接或者间接的扯上关系