在运行时加载XIB文件

先创建一个RuntimeViewController，并且绑定xib，直接上代码:

//导入创建的xib文件

#import "RuntimeViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    //创建一个按钮

    UIButton *myBtn=[[UIButton alloc]initWithFrame:CGRectMake(100, 200, 100, 44)];

    //在按钮上面设置文字

    [myBtn setTitle:@"加载" forState:UIControlStateNormal];

    //为按钮绑定一个点击事件

    [myBtn addTarget:self action:@selector(loadXib) forControlEvents:UIControlEventTouchUpInside];

    //把按钮添加到视图上面

    [self.view addSubview:myBtn];

    // Do any additional setup after loading the view, typically from a nib.

}

-(void)loadXib{

    //创建对象

    RuntimeViewController *rtVC=[[RuntimeViewController alloc]initWithNibName:@"RuntimeViewController" bundle:nil];

    //页面跳转

    [self presentViewController:rtVC animated:YES completion:nil];

}