ios - 警告 : Attempt to present UINavigationController on UIViewController which is already presenting

Question

我有一个关于 React Native 的模块，并在这个问题的标题中抛出错误。这是模块的代码，我不知道 swift 或 Objective-C，所以我需要你像“swift for idiots”一样解释我

#import "CheckoutMercadoPagoModule.h"
#import "AppDelegate.h"

@import MercadoPagoSDK;

@implementation CheckoutMercadoPagoModule

RCT_EXPORT_MODULE()

- (dispatch_queue_t)methodQueue
{
    return dispatch_get_main_queue();
}

RCT_EXPORT_METHOD(startCheckout:(NSString *)publicKey:(NSString *)prefId:(RCTPromiseResolveBlock)resolve:(RCTPromiseRejectBlock)reject) {

    [MercadoPagoContext setPublicKey: publicKey];
    [MercadoPagoContext setSiteID:@"MLA"];

    UINavigationController *checkoutFlow = [MPFlowBuilder startCheckoutViewController:prefId callback:^(Payment *payment) {
        NSDictionary *dictionary = @{@"id": payment._id, @"status": payment.status};
        resolve(dictionary);
    } callbackCancel:nil];

    AppDelegate *share = (AppDelegate *)[UIApplication sharedApplication].delegate;
    UINavigationController *nav = (UINavigationController *) share.window.rootViewController;
    [nav presentViewController:checkoutFlow animated:YES completion:^{}];
}

@end

Answer 1

尝试在 Window 本身而不是 rootviewcontroller 上呈现

  [share.window presentViewController:checkoutFlow animated:YES completion:^{}];

}