Question

这是我的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];
    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"HasLaunchedOnce"])
    {
    }
    else
    {
        guideTourViewController *guide=[self.storyboard instantiateViewControllerWithIdentifier:@"GuideTour"];
        guide.modalTransitionStyle=UIModalTransitionStyleCrossDissolve;
        [self presentViewController:guide animated:NO completion:nil];
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"HasLaunchedOnce"];
        [[NSUserDefaults standardUserDefaults] synchronize];
        // This is the first launch ever

    }

 }

为什么即使第一次启动应用程序，guideTourViewController仍然没有显示？

Answer 1

似乎是两个连续的过渡问题，如果我是正确的，你可以放入else部分

double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    //
    guideTourViewController *guide=[self.storyboard instantiateViewControllerWithIdentifier:@"GuideTour"];
    guide.modalTransitionStyle=UIModalTransitionStyleCrossDissolve;
    [self presentViewController:guide animated:NO completion:nil];
    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"HasLaunchedOnce"];
    [[NSUserDefaults standardUserDefaults] synchronize];
});

您可以根据需要减少延迟。

希望这会有效..

为什么检测首次启动或不启动方法不起作用

1 个答案: