iOS Modal

//one控制器(当前控制器)点击jump需要跳转到新控制器two控制器
- (IBAction)jump {
    // 展示TwoViewController
    TwoViewController *two = [[TwoViewController alloc] init];
    
    [self presentViewController:two animated:YES completion:^{
        NSLog(@"展示MJTwoViewController完毕.......");
    }];
}

//点击two控制器的某控件执行cancel方法即可退出当前的two控制器
- (IBAction)cancel {
      //退出当前被modal出来的控制器
      [self dismissViewControllerAnimated:YES completion:^{
        NSLog(@"关闭MJTwoViewController....");
    }];
}