知道当在Facebookloginbutton被按下时

当有人按facebookloginbutton时，我想显示一个HUD。 目前我很难知道button被按下的时间。

我试图抓住所有的视图，但这不适用于Facebookbutton上的任何共振…

怎样才能知道什么时候按下Facebookloginbutton，打电话给我的HUD？

另外，它将很高兴知道Facebookloginbutton触发哪个function。 找不到

代码抓住水龙头，在LoginViewController.m（更新，工作解决scheme）

// workaround to find out when user tapped the login button -(void)addTapFinder { UITapGestureRecognizer *tapped = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped)]; tapped.numberOfTapsRequired = 1; tapped.delegate = self; tapped.cancelsTouchesInView = NO; FBLoginView *fbButton = [[FBLoginView alloc] init]; UIView * fbView = (UIView *)fbButton; fbView = [self.view viewWithTag:fbloginViewTAG]; [fbView addGestureRecognizer:tapped]; DLog(@"found View %@", fbView); } -(void)tapped { DLog(@"tapped"); } 

debugging器日志

 [872:60b] -[LoginViewController FacebookLogin] [Line 283] loginview subviews: <FBShadowLabel: 0x16d17840; baseClass = UILabel; frame = (33 -1; 168 46); text = 'Connect Facebook'; autoresize = W; userInteractionEnabled = NO; layer = <CALayer: 0x18136240>> [872:60b] -[LoginViewController showFBLogin] [Line 231] show login View [872:60b] -[LoginViewController tapped] [Line 250] tapped // tapped somewhere in self.view, but not the login button // tapped the login button, no "tapped" entry in the logfile 

在完整的代码下面：

LoginViewController.h

 #import <UIKit/UIKit.h> #import <FacebookSDK/FacebookSDK.h> #import "WebApi.h" #import "SVProgressHUD.h" @interface LoginViewController : UIViewController <FBLoginViewDelegate, UIGestureRecognizerDelegate> -(IBAction)toSurroundView; @property (nonatomic, strong) WebApi *swebapi; @property (nonatomic) BOOL isFirstFBLoginDone; @property (weak, nonatomic) IBOutlet UIView *loginView; @end 

LoginViewController.m

 #import "LoginViewController.h" @interface LoginViewController () @end @implementation LoginViewController static int const fbloginViewTAG = 203; -(void)vinit { self.swebapi = [[WebApi alloc] init]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleNotification:) name:@"didRegisterUser" object:nil ]; self.isFirstFBLoginDone = FALSE; } - (void)viewDidLoad { [self vinit]; [super viewDidLoad]; [self showFBLogin]; } -(void)handleNotification:(NSNotification *)message { if ([[message name] isEqualToString:@"didRegisterUser"]) { [self toSurroundView]; } } -(IBAction)toSurroundView { [SVProgressHUD dismiss]; // connecting to Facebook, this is called to late! UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil]; UIViewController *surroundViewController = [mainStoryboard instantiateInitialViewController]; surroundViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; [self presentViewController:surroundViewController animated:YES completion:nil]; } #pragma mark - Facebook Things -(void)showFBLogin { UIView *connectView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)]; [self.view addSubview:connectView]; [self FacebookLogin]; [self addTapFinder]; DLog(@"show login View"); } // workaround to find out when user tapped the login button -(void)addTapFinder { UITapGestureRecognizer *tapped = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped)]; tapped.numberOfTapsRequired = 1; tapped.delegate = self; tapped.cancelsTouchesInView = NO; FBLoginView *fbButton = [[FBLoginView alloc] init]; UIView * fbView = (UIView *)fbButton; fbView = [self.view viewWithTag:fbloginViewTAG]; [fbView addGestureRecognizer:tapped]; DLog(@"found View %@", fbView); } -(void)tapped { DLog(@"tapped"); } -(void)FacebookLogin { // https://developers.facebook.com/docs/ios/login-ui-control/ // https://developers.facebook.com/docs/ios/session/ FBLoginView *loginView = [[FBLoginView alloc] init]; loginView.delegate = self; loginView.tag = fbloginViewTAG; loginView.readPermissions = @[@"email", @"basic_info"]; loginView.frame = CGRectOffset(loginView.frame, (self.view.center.x - (loginView.frame.size.width / 2)), ([[UIScreen mainScreen] bounds].size.height - 80)); // change fb login button text UILabel *fblabel = [loginView subviews][1]; fblabel.text = @"Connect Facebook"; DLog(@"loginview subviews: %@", [loginView subviews][1]); [self.view addSubview:loginView]; [loginView sizeToFit]; } - (void)loginViewFetchedUserInfo:(FBLoginView *)loginView user:(id<FBGraphUser>)user { [SVProgressHUD showWithStatus:@"Connecting with Facebook"]; if (! self.isFirstFBLoginDone) { #warning simple workaround, but not solving the source problem of twiced call from loginViewFetchedUserInfo if ([[SingletonClass sharedInstance] hasCredentials] == NO) { [self.swebapi registerUser:user]; } else { [self toSurroundView]; } self.isFirstFBLoginDone = TRUE; } // isFirstFBLoginDone } @end 

Answer 1

一些可能会导致您的代码中的问题的东西 –

1. 设置UIGestureRecognizer的委托，以强制识别多个手势识别器，特别是同时识别这个新的手势识别器和Facebookloginbutton的手势识别器）： gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer

2. 将您的UIGestureRecognizer的cancelsTouchesInView属性设置为NO。

3. 你应该将FBLoginView声明为FBLoginView ，并将UIView fbButton为FBLoginView ，而不是将你的指针初始化为FBLoginView 。

4. （最重要的）你应该将UITapGestureRecognizer添加到视图中，当你将它添加到button。

更改：

 [self.view addGestureRecognizer:tapped]; 

至：

 [fbButton addGestureRecognizer:tapped];