在URL方案OpenURL之后从AppDelegate调用ViewController方法

时间:2014-11-21 19:04:27

标签: ios objective-c iphone xcode uiviewcontroller

我正在尝试从AppDelegate.m调用ViewController.m中的函数LoadWebpage

我已经使用URL方案启用了我的应用,以便" urlscheme://?querystring" Safari中的链接打开我的应用程序。我在AppDelegate中捕获url方案(我可以通过记录这可以告诉它这是有效的)并且想用查询字符串填充一个全局变量,然后调用我的LoadWebPage方法,以便视图控制器可以使用全局变量并在WebView控件中打开请求的网站。

我关注this tutorial

这是AppDelegate.m:

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation{
    NSLog(@"Calling Application Bundle ID: %@", sourceApplication);
    NSLog(@"URL scheme:%@", [url scheme]);
    NSLog(@"URL query:%@", [url query]);
    URLString = (NSString *)[url query]; //extern variable

    [self.ViewController loadWebpage];
    return YES;

}

在ViewController.m中:

- (void)LoadWebpage{

    NSString *strURL=URLString;  //more logic will be required to get the appropriate url from the query string.
    NSURL *url = [NSURL URLWithString:strURL];
    NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
    [self.webview loadRequest:urlRequest];

}

但是[self.ViewController loadWebpage];行有一个错误"属性' ViewController'没有找到类型' AppDelegate'"。

的对象

我猜我需要合成对open opencontroller的引用,但我无法找到有关如何执行此操作的信息。这是解决这个问题的最好方法吗?

编辑:根据Yan的评论,我尝试添加

ViewController* mainController = (ViewController*)  self.window.rootViewController;
[mainController LoadWebpage];

而不是[self.ViewController loadWebpage];,而只是用lldb结束调试?

2 个答案:

答案 0 :(得分:6)

我建议让View Controller注册以在应用启动时收到通知,而不是试图在视图控制器中触发AppDelegate。然后,您可以检查您在AppDelegate中设置的变量并做出相应的反应。

例如:

YourViewController.m:

- (void)viewDidLoad {
    [super viewDidLoad];

    // This notification is sent the first time the app launches
    [[NSNotificationCenter defaultCenter] addObserver: self
                                             selector: @selector(applicationBecameActive:)
                                                 name: UIApplicationDidBecomeActiveNotification
                                               object: nil];

    // This notification is sent when the app resumes from the background
    [[NSNotificationCenter defaultCenter] addObserver: self
                                             selector: @selector(applicationEnteredForeground:)
                                                 name: UIApplicationWillEnterForegroundNotification
                                               object: nil];
}

答案 1 :(得分:2)

对于那些在Swift中想要它的人来说!

首先,创建要发送数据的NotificationCenter post方法(在Swift 2.0 - NSNotification Center中):

    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "NOTIFICATION_NAME"), object: nil)

    return true
}

在您想要接收数据的ViewController类中,在super.viewDidLoad()中添加以下内容:

NotificationCenter.default.addObserver(self,selector: #selector(self.YOUR_METHOD_NAME),
name: NSNotification.Name(rawValue: "NOTIFICATION_NAME"),
object: nil)

您要调用的方法:

func YOUR_METHOD_NAME(notification: NSNotification) {
    // Your method calling, or what you want to do with received data
}