ios - 从 UIActionSheet 类中关闭 UIViewController

Question

我创建了一个 UIActionSheet 类，它允许我从应用程序中的任何位置注销。我遇到的问题是，一旦我点击注销按钮，它也应该关闭当前的 viewController 并返回到登录 viewController。下面是我的代码片段。

NSObject.h file 

@interface constants : NSObject<UIActionSheetDelegate>{

    UIActionSheet *msg;

}

-(void)presentMyActionSheet;
@property (nonatomic, strong) UIView *viewForActionSheet;


NSObject.m file

-(void)presentMyActionSheet{

msg = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:@"Log Out" otherButtonTitles:nil, nil];

[msg showInView:self.viewForActionSheet];

}
// actionsheet delegate protocol item
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex: (NSInteger)buttonIndex{

    NSLog(@"button index = %ld", (long)buttonIndex);
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    if(buttonIndex == 0){
                [defaults setObject:nil forKey:@"acctInfo"];
                [defaults setBool:NO forKey:@"isLoggedOn"];

                NSLog(@"You logged out");

这是我试过的。

   viewController *controller = [[viewController alloc]init];
   [controller.navigationController popViewControllerAnimated:NO];  
   [controller dismissViewControllerAnimated:NO completion:nil];

它不起作用。

            }else{

                NSLog(@"You canceled logout");
            }

}

 viewController.h file

@interface viewController : UIViewController<UIActionSheetDelegate>

@property(nonatomic, retain)constants *obj;


viewController.m file

@synthesize obj;

{
    self.obj = [[constants alloc] init];
    self.obj.viewForActionSheet = self.view;
    [self.obj presentMyActionSheet];

    if([defaults boolForKey:@"isLoggedOn"]){

If I try it from here it crashes.
     //   [self.navigationController popViewControllerAnimated:NO];
     //   [self dismissViewControllerAnimated:NO completion:nil];

    }
}

关于它为何不起作用的任何建议？

谢谢

Answer 1

您应该在对象类中使用 NSNotification 或您自己的委托(delegate)。