Question

我只是在按下警报视图的第一个按钮时尝试这样做，另一个UIView出现了。

到目前为止，我已经完成了这项工作，但按下按钮后我得到的只是黑屏。第二个UIView称为ResultsViewController。

我哪里错了？任何帮助表示赞赏！

在顶部：

@class ResultsViewController;
ResultsViewController *ResultsviewController;

然后：

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if(buttonIndex == 0){


        UIViewController *ResultsviewController = [[UIViewController alloc] initWithNibName:nil bundle:nil];
        [self presentViewController:ResultsviewController animated:YES completion:nil];
    }
    if(buttonIndex == 1){

        [self startRunning];
    }
}

Answer 1

这两行只是创建一个UIViewController

    UIViewController *ResultsviewController = [[UIViewController alloc] initWithNibName:nil bundle:nil];
    [self presentViewController:ResultsviewController animated:YES completion:nil];

你需要

   ResultsViewController  * ResultsviewController = [[ResultsViewController alloc] initWithNibName:nil bundle:nil];
    [self presentViewController:ResultsviewController animated:YES completion:nil];

Answer 2

你宣告ResultsViewController *ResultsviewController;，然后你再做一次：

UIViewController *ResultsviewController = [[UIViewController alloc] initWithNibName:nil bundle:nil];

为什么这样做的理由？您不必调用initWithNibName：bundle：如果您不提供nib名称。替换此行：

UIViewController *ResultsviewController = [[UIViewController alloc] initWithNibName:nil bundle:nil];

与那一个：

UIViewController *ResultsviewController = [[UIViewController alloc] init];
//your code to present result view controller

// EXTENDED

尝试将两行移动到新方法，例如：

-(void)openNewView {
    UIViewController *ResultsviewController = [[UIViewController alloc] init];
    [self presentViewController:ResultsviewController animated:YES completion:nil];
}

并在点击按钮时延迟调用它：

[self performSelector:@selector(openNewView) withObject:nil afterDelay:0.5];

AlertView指向新的UIView

2 个答案: