ios - 按钮不响应选择器

Question

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我试图让这段代码工作，但每当我按下“nextButton”时，程序就会结束，我无法弄清楚哪里出了问题。你能不能看看我的代码，看看是否有什么问题。

- (void)viewDidLoad {
[super viewDidLoad];

Player1.placeholder = @"Player 1";
Player2.placeholder = @"Player 2";
Notes1.placeholder = @"Notes";
Notes2.placeholder = @"Notes";

[nextButton setAction:@selector(nextButtonPressed:)];

}

-(IBAction)nextButtonPressed:(id)sender {

if ([self.delegateP respondsToSelector: @selector(addPlayerViewController:didFinishEnteringPlayer1:didFinishEneteringPlayer2:)]) {

    [self.delegateP addPlayerViewController:self didFinishEnteringPlayer1:Player1.text didFinishEneteringPlayer2:Player2.text];

    NSLog(@"Works");

 }

[self performSelector:@selector(nextButtonPressed:) withObject:nil afterDelay:0.25];

}

我还有一个问题与这段代码有关。要使用委托(delegate)通过不同的 View Controller 传递信息，您是否必须使用按钮或条形按钮项？

显示的错误:

-[UIStoryboardPushSegueTemplate nextButtonPressed:]: unrecognized selector sent to instance

Answer 1

首先你不能把两行:

[self presentModalViewController:gameDetails animated:YES];

 [self.navigationController pushViewController: gameDetails animated:YES];

然后转到您的 viewController PlayersViewController 并单击 Storyboard单击编辑器(顶部菜单 XCode)嵌入 > 导航 Controller 现在您使用您的代码更改下一行:

-(void) nextButtonPressed {
NSLog(@"Hi my friend");
[self performSegueWithIdentifier:@"YOUR_SEGUE_NAME_HERE" sender:@"hi"];}

并创建新函数:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
// Make sure your segue name in storyboard is the same as this line
if ([[segue identifier] isEqualToString:@"YOUR_SEGUE_NAME_HERE"])
{
    // Get reference to the destination view controller
    YourViewController *vc = [segue destinationViewController];

    // Pass any objects to the view controller here, like...
    [vc setMyObjectHere:sender];
}}

ViewController“YourViewController.h :

@interface YourViewController : UIViewController
@property (nonatomic, strong) NSString *MyObjectHere;
@end