Question

我正在学习iOS开发，我在互联网上找到了一个应用源代码示例。我正在尝试重写它并将其用于选项卡式布局，并且在从示例应用程序复制AppDelegate.m之后，我收到以下错误：

'FirstViewController'没有Visible @interface声明了选择器alloc

在以下行中：

FirstViewController *FirstViewController = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];

这是我的完整AppDelegate：

#import "AppDelegate.h"

#import "FirstViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.

    FirstViewController *FirstViewController = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
    self.navigationController = [[UINavigationController alloc] initWithRootViewController:FirstViewController];
    self.navigationController.navigationBar.barStyle = UIBarStyleBlackOpaque;
    self.window.rootViewController = self.navigationController;
    [self.window makeKeyAndVisible];
    return YES;
}

@end

我的selector InithWithNibName:bundle文件

中出现同样的错误（包含FirstViewController.m）

MyViewController* MyController  = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil];

我不知道这个错误意味着什么。

Answer 1

您应该为变量和类使用不同的名称。

变化：

var str = 'This* is a ** test string. **';
var count = (str.match(/\*/g) || []).length;
if (count >= 5) {
  alert('doing something...')
}
else {alert(count);}

为：

FirstViewController *FirstViewController = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];

'MyController'的@interface不可见声明了选择器

1 个答案: