Question

当我运行我的应用程序时，

我的信息按钮显示但它没有做任何事情，当我点击它时没有响应。

在我的ProfileViewController文件中：

- (void)viewDidLoad
{
    UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeInfoDark];
    infoButton.frame = CGRectMake(290.0, 10.0, 15.0, 15.0);
    [infoButton addTarget:self action:@selector(toggleCreditsOpen:)forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:infoButton];

    [super viewDidLoad];
}

我还有以下两种方法来加载about视图（单击按钮时加载的屏幕）：

- (IBAction) toggleCreditsOpen:(id)inSender
{   
    UIViewController *theController = [[UIViewController alloc] initWithNibName:@"AboutViewController" bundle:nil];
    [self.navigationController presentModalViewController:theController animated:TRUE];
}

- (IBAction) toggleCreditsClosed:(id)inSender
{
    [self.navigationController dismissModalViewControllerAnimated:TRUE];
}

编辑：我在这里添加完整的实现文件：

#import "ProfileViewController.h"
#import "AboutViewController.h"

@implementation ProfileViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)dealloc
{
    [super dealloc];
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (IBAction)toggleCreditsOpen:(id)inSender
{   
    UIViewController *theController = [[UIViewController alloc] initWithNibName:@"AboutViewController" bundle:nil];
    [self.navigationController presentModalViewController:theController animated:YES];
}

- (IBAction)toggleCreditsClosed:(id)inSender
{
    [self.navigationController dismissModalViewControllerAnimated:TRUE];
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    UIButton *infoButton = [[UIButton buttonWithType:UIButtonTypeInfoDark] retain];
    infoButton.frame = CGRectMake(290.0, 10.0, 15.0, 15.0);
    //[infoButton addTarget:self action:@selector(toggleCreditsOpen:)forControlEvents:UIControlEventTouchUpInside];
    [infoButton addTarget:self action:@selector(toggleCreditsOpen:)forControlEvents:UIControlEventTouchDown];
    [self.view addSubview:infoButton];

    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

Answer 1

我根本不知道为什么这不起作用，但是如果我猜测，我会说它在[self.navigationController presentModalViewController：theController animated：TRUE];

语句。据我所知，它应该是：

[self.navigationController presentModalViewController:theController animated:YES];

执行此操作后查看是否有效。我不确定，但这可能是你的代码的问题。

Answer 2

喜你犯了一个错误来定义你的按钮.. 只需在按钮末尾指定retain属性喜欢 UIButton * infoButton = [UIButton buttonWithType：UIButtonTypeInfoDark] retain];

并且还给 [infoButton addTarget：self action：@selector（toggleCreditsOpen :) forControlEvents：UIControlEventTouchDown];

Answer 3

如果self.navigationController不是nil，并且主捆绑中存在AboutViewController.xib，则使用您提供的代码对我有用。否则，我看不出任何容易出错的事。

如果您没有导航控制器，toggleCreditsOpen:中的正确行将是：

[self presentModalViewController:theController animated:YES];

修改

如果您想稍后关闭模态视图，通常最好使用委托来执行此操作。而不是

UIViewController *theController = [[UIViewController alloc] initWithWhatever];

你可以做到

AboutViewController *theController = [[AboutViewController alloc] initWithWhatever];

其中AboutViewController有一个委托。可能类似于id<DismissModalProtocol> delegate;。然后，您的视图控制器将实现此@protocol，并在调用presentModalViewController:animated:之前，它将自己设置为委托。所以非常粗略地说，它看起来像这样：

// AboutViewController.h @protocol DismissModalProtocol; @interface AboutViewController : UIViewController { id<DismissModalProtocol> delegate; } @property id<DismissModalProtocol> delegate; @end @protocol DismissModalProtocol <NSObject> - (void)dismissController:(UIViewController *)viewController; @end // ProfileViewController.h #import "AboutViewController.h" @interface ProfileViewController : UIViewController <DismissModalProtocol> @end // ProfileViewController.m @implementation ProfileViewController - (void)dismissController:(UIViewController *)viewController { [self dismissModalViewControllerAnimated:YES]; } - (void)toggleCreditsOpen:(id)sender { AboutViewController *controller = [[AboutViewController alloc] init]; controller.delegate = self; [self presentModalViewController:controller animated:YES]; } @end

为什么我的信息按钮不起作用？

3 个答案: