得到了如下报错:**Application tried to present a nil modal view controller on target**。我在运行的程序是,首先判断条件是否满足,启动后修改初始化视图控制器。
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:( NSDictionary *)launchOptions
{
if(![[NSUserDefaults standardUserDefaults] boolForKey:@"logged_in"]) {
ViewControllerOne *vc1 = [[ViewControllerOne alloc]init];
vc1=[self.storyboard instantiateViewControllerWithIdentifier: @"vc1"];
[self presentViewController:vc1 animated:YES completion:Nil];
} else {
ViewControllerTwo *vc2 = [[ViewControllerTwo alloc]init];
vc2=[self.storyboard instantiateViewControllerWithIdentifier: @"vc2"];
[self presentViewController:vc2 animated:YES completion:Nil];
}
// Override point for customization after application launch.
return YES;
}