Question

下一步按钮无效。它会引发错误Application tried to present modally an active controller当我按ViewControllers按钮时，我应该如何通过next数组进行枚举。我已经阅读了很多关于同一问题的线索，但无法找出解决方案。提前谢谢！

.h文件

@property(nonatomic, strong) NSMutableArray *tab;

.m文件

- (IBAction)newTab:(id)sender {
    UIStoryboard *st = [UIStoryboard storyboardWithName:[[NSBundle mainBundle].infoDictionary objectForKey:@"UIMainStoryboardFile"] bundle:[NSBundle mainBundle]];
    myViewController *newTab = [st instantiateViewControllerWithIdentifier:@"myViewController"];
    if (![newTab isBeingPresented]) {
        [self presentViewController:newTab animated:YES completion:nil];

        [tab addObject:newTab];
}
}
- (IBAction)next:(id)sender {

    [tab enumerateObjectsUsingBlock:^(id object, NSUInteger idx, BOOL *stop) {


        [self presentViewController:tab[idx] animated:YES completion:nil];
    }];    }




- (IBAction)prev:(id)sender {

    for (i=[tab count]; i>0; i--) {
    if (![self  isBeingDismissed]){
    [tab[i-1] dismissViewControllerAnimated:YES completion:nil];
        ;
}}}

Answer 1

您可以枚举堆栈中的ViewControllers

NSArray * controllerArray = [[self navigationController] viewControllers];

for (UIViewController *controller in controllerArray){
    //Code here.. e.g. print their titles to see the array setup;
    NSLog(@"%@",controller.title);
    if ([controller.title isEqual:@"Title1"]) {
        [self.navigationController popToViewController:controller animated:YES];
    }
}

选择Next按钮枚举堆栈中的视图并检查标题并执行该视图所需的特定操作。上面我已经将代码添加到popViewController中，如果标题匹配。

希望它有所帮助。

枚举位于堆栈中的ViewControllers

1 个答案: