Question

所以我有我的主viewController，我只有一个按钮。按钮的代码是：

- (IBAction)eventsButton:(id)sender {
self.eventsViewController =[[EventsViewController alloc]initWithNibName:@"EventsViewController" bundle:nil];
[self.navigationController pushViewController:eventsViewController animated:YES];}

其中EventsViewController是另一个控制器，我想在单击此按钮时导航。但是，当我点击它没有任何反应..我没有导航到另一个控制器。

ViewController.h
-------------------
#import <UIKit/UIKit.h>

@class EventsViewController;

@interface ViewController : UIViewController <UIActionSheetDelegate>

- (IBAction)eventsButton:(id)sender;

@property (strong, nonatomic) EventsViewController *eventsViewController;


@end




ViewController.m
-----------------
#import "ViewController.h"
#import "EventsViewController.h"

@implementation ViewController

@synthesize eventsViewController;


- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

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

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

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

- (IBAction)eventsButton:(id)sender {
    self.eventsViewController =[[EventsViewController alloc]initWithNibName:@"EventsViewController" bundle:nil];
    [self.navigationController pushViewController:eventsViewController animated:YES];
}

@end

我在IBACTION中放了一个断点，我看到代码已执行，但它从未导航到另一个控制器。另一个控制器只是一个我用Xcode创建的简单控制器，它拥有Xcode提供的所有代码，而不是我的代码。有什么想法吗？

Answer 1

我的猜测是你没有将ViewController放在UINavigationController中。首先，你必须分配和初始化UINavigationController。所以在application: didFinishLounchingWithOptions:

内

ViewController *viewController = [[ViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:viewController]
[self.window setRootViewController:navigationController];
[self.window makeKeyAndVisible]

它应该有用。

Answer 2

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

它的工作原理当前视图控制器是导航控制器。实际上你在普通视图控制器中实现此代码而不是在导航控制器中。请检查以下代码替换上面的行

[self presentModalViewController:eventsViewController animated:YES];

所以你需要为当前的视图控制器实现导航控制器。在Appdelegate中，您可以使用视图控制器将根视图控制器更改为导航控制器。

UINavigationController *navController = [[[UINavigationController alloc] initWithRootViewController:yourController] autorelease];
self.window.rootViewController = navController;

如何在点击按钮时更改控制器，iOS？

2 个答案: