ios - 检查特定 ViewController 是否多次出现在导航堆栈中

Question

我正在开发 iOS 应用程序，我想检查特定 ViewController 是否在导航堆栈中出现多次。

Answer 1

self.navigationController.viewControllers 返回堆栈中的所有 View Controller 。喜欢

@interface ViewController () {
    // create the one global int for get the count of VC.
    int myVar;
}



- (void)viewDidLoad {
    [super viewDidLoad];
    myVar = 0;
    for (UIViewController *vc in self.navigationController.viewControllers) {
        // check your VC is available or not in using isKindOfClass
        if ([vc isKindOfClass:[ViewController class]]) {
            myVar +=  1;
        }
    }

    if (myVar > 1){
        // available
    }
}