UIButton行动不工作的ios

我更新xcode 6.2到7，并添加：

self.window.rootViewController = [UIViewController new]; 

在AppDelegate.m中

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; //add in there self.window.rootViewController = [UIViewController new]; ViewController2 *viewController = [[ViewController2 alloc] init]; UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:viewController]; navController.navigationBar.tintColor = [UIColor colorWithRed:0/255.0 green: 30.0/255.0 blue: 200.0/255.0 alpha:1]; [self.window addSubview:navController.view]; return YES; } 

但现在

 [button_Sinnup addTarget:self action:@selector(PLP) forControlEvents:UIControlEventTouchUpInside]; 

这个代码在ViewController2.m中不起作用

 - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. [self.view setBackgroundColor:[UIColor blueColor]]; UIButton *button_Sinnup = [UIButton buttonWithType:UIButtonTypeCustom]; [button_Sinnup setTitle:@"" forState:UIControlStateNormal]; [button_Sinnup addTarget:self action:@selector(PLP) forControlEvents:UIControlEventTouchUpInside]; button_Sinnup.frame = CGRectMake(16, 76, 185, 45); [button_Sinnup setBackgroundColor:[UIColor colorWithRed:224.0f/255.0f green:31.0f/255.0f blue:73.0f/255.0 alpha:0]]; [ button_Sinnup setBackgroundColor:[UIColor redColor]]; [self.view addSubview:button_Sinnup]; } 

我不能调用方法PLP

 - (void)PLP{ ViewController2* svc=[[ViewController2 alloc]init]; [self presentViewController:svc animated:YES completion:nil]; } 

Answer 1

您在添加导航控制器时出错：replace：

 [self.window addSubview:navController.view]; 

同

 self.window.rootViewController = navController;