知道何时在 ios 中按下 facebook 登录按钮

Posted 2023-02-27

【中文标题】知道何时在 ios 中按下 facebook 登录按钮

【英文标题】：Know when facebook login button is pressed in ios

【发布时间】：2014-04-05 16:25:18

【问题描述】：

我想在有人按下 facebook 登录按钮时显示 HUD。目前我很难知道何时按下按钮。

我试图抓住视图的所有点击，但这不适用于 facebook 按钮上的任何响应...

如何知道何时按下 facebook 登录，以调用我的 HUD？

另外，最好知道 facebook 登录按钮触发了哪个功能。没找到。。

在 LoginViewController.m 中获取水龙头的代码（已更新，工作解决方案）

// 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");

调试器日志

[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

完整代码如下：

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

【参考方案1】：

可能会导致代码出现问题的几件事 --

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手势识别器以及 Facebook 登录按钮的手势识别器）使用：gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer

将UIGestureRecognizer 的cancelsTouchesInView 属性设置为NO。

与其将指向fbButton 的指针初始化为UIView，不如将​​fbButton 声明为FBLoginView，并将UIView 转换为FBLoginView。

（最重要的是）当您应该将 UITapGestureRecognizer 添加到按钮时，您将其添加到视图中。

变化：

[self.view addGestureRecognizer:tapped];

到：

[fbButton addGestureRecognizer:tapped];

【讨论】：

嗨。用你的建议更新了我的代码（看看我的问题，addTapFinder2）。它仍然无法识别水龙头。我正在考虑尝试使用触摸手势而不是触摸手势...

终于让它工作了。必须添加tapped.cancelsTouchesInView = NO; 发现于***.com/a/16885076/1933185。如果您使用此信息更新您的答案会很棒:) 其他人可以从中受益。 注意：将 addTapFinder2 替换为 addTapFinder

与 tapped.cancelsTouchesInView = NO; 合作，感谢 jerik