枚举的简单实用

/*XXXViewController.h*/
// 枚举的创建
typedef NS_ENUM(NSInteger, lastVC) {
    OTHERVC,     // 其他界面
    HOMEVC      // 首页进来
};

@property (nonatomic,assign)lastVC lastVc;

// 枚举的使用
XXXViewController * xx = [[XXXViewController alloc]init];
xx.lastVC = HOMEVC;
[self.navigationController pushViewController: xx animated:YES];

/*XXXViewController.m*/

if (_lastVc == HOMEVC) {
        [self dismissViewControllerAnimated:YES completion:^{
            
        }];
        
    }else{
    
    [self.navigationController popViewControllerAnimated:YES];
    }