适用于iOS的Google+ SDK以编程方式添加登录按钮 [英] Google+ SDK for iOS Add Signin button programmatically

问题描述

至于G +文档： https://developers.google.com/ + / mobile / ios / sign-in

登录按钮可以使用XIB添加，也可以在UIViewController中以编程方式添加。

The sign in button can be added using a XIB or programmatically in a UIViewController.

我有一个TableViewController，我将添加G + Signin按钮作为表格行的附件视图：

I have a TableViewController and I'm going to add the G+ Signin button as the accessory view of a table row:

subtitleCell.accessoryView = self.googlePlusSignInButton;

其中登录按钮将按如下方式初始化：

where the signin button is going to be initialized as follows:

-(void) setGooglePlusButtons {

    self.googlePlusSignInButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];


    UIImage *backgroundButtonImage = [UIImage imageNamed:@"bt_search_cancel.png"];

    googlePlusSignInButton_.frame = CGRectMake(0.0f,
                                               0.0f,
                                               backgroundButtonImage.size.width,
                                               backgroundButtonImage.size.height);

    googlePlusSignInButton_.titleLabel.textColor = [UIColor whiteColor];
    googlePlusSignInButton_.titleLabel.font = [UIFont boldSystemFontOfSize:11.0f];
    googlePlusSignInButton_.titleLabel.numberOfLines = 2;

    googlePlusSignInButton_.titleLabel.shadowColor = [UIColor darkGrayColor];
    googlePlusSignInButton_.titleLabel.shadowOffset = CGSizeMake(0.0f,
                                                                 -1.0f);

    [googlePlusSignInButton_ setTitle:NSLocalizedString(@"UI_BUTTONS_LOGIN", @"")
                             forState:UIControlStateNormal];

    [googlePlusSignInButton_ setBackgroundImage:backgroundButtonImage
                                       forState:UIControlStateNormal];


    // Make sure the GPPSignInButton class is linked in because references from
    // xib file doesn't count.
    [GPPSignInButton class];

    GPPSignIn *signIn = [GPPSignIn sharedInstance];

    signIn.delegate = self;
    signIn.shouldFetchGoogleUserEmail = signIn.shouldFetchGoogleUserEmail;
    signIn.actions = [NSArray arrayWithObjects:
                      @"http://schemas.google.com/ListenActivity",
                      nil];

}

按钮设置在viewDidLoad：

The button is set up at the viewDidLoad:

- (void)viewDidLoad {

    [super viewDidLoad];

    [self setGooglePlusButtons];

//...

UIViewControlled有一个登录界面委托：

The UIViewControlled has an interface for the signin delegate:

@interface MXMSettingsTableViewController () <GPPSignInDelegate>
@end

似乎未调用委托或共享登录按钮未链接到控制器的实例：

It seems that the delegate is not being called or the shared sign in button is not linked to the instance of the controller:

// GPPSignInDelegate

- (void)finishedWithAuth:(GTMOAuth2Authentication *)auth
                   error:(NSError *)error {
   ///....
}

我认为

// Make sure the GPPSignInButton class is linked in because references from
// xib file doesn't count.
[GPPSignInButton class];

链接ViewController实例按钮：

is linking the ViewController instance button:

// The button that handles Google+ sign-in.
@property (retain, nonatomic) GPPSignInButton *googlePlusSignInButton;

但这个实现中有些问题我无法理解。

but there is something wrong in this implementation I cannot figure out.

推荐答案

首先，您应该在 googlePlusSignInButton

所以代码应为：

-(void) setGooglePlusButtons {

    self.googlePlusSignInButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];


    UIImage *backgroundButtonImage = [UIImage imageNamed:@"bt_search_cancel.png"];

    googlePlusSignInButton_.frame = CGRectMake(0.0f,
                                               0.0f,
                                               backgroundButtonImage.size.width,
                                               backgroundButtonImage.size.height);

    googlePlusSignInButton_.titleLabel.textColor = [UIColor whiteColor];
    googlePlusSignInButton_.titleLabel.font = [UIFont boldSystemFontOfSize:11.0f];
    googlePlusSignInButton_.titleLabel.numberOfLines = 2;

    googlePlusSignInButton_.titleLabel.shadowColor = [UIColor darkGrayColor];
    googlePlusSignInButton_.titleLabel.shadowOffset = CGSizeMake(0.0f,
                                                                 -1.0f);

    [googlePlusSignInButton_ setTitle:NSLocalizedString(@"UI_BUTTONS_LOGIN", @"")
                             forState:UIControlStateNormal];

    [googlePlusSignInButton_ setBackgroundImage:backgroundButtonImage
                                       forState:UIControlStateNormal];

    [googlePlusSignInButton addTarget:self action:@selector(signInGoogle:) forControlEvents:UIControlEventTouchUpInside];
}

并且登录应该是这样的：

and the sign in should be this way:

- (void)signInGoogle {
    GPPSignIn *signIn = [GPPSignIn sharedInstance];
    signIn.delegate = self;
    signIn.shouldFetchGoogleUserEmail = YES;
    signIn.clientID = kClientID;
    signIn.scopes = [NSArray arrayWithObjects:kGTLAuthScopePlusLogin,nil];
    signIn.actions = [NSArray arrayWithObjects:@"http://schemas.google.com/ListenActivity",nil];
    [signIn authenticate];
}

您的代码缺少 [signIn authenticate]; 调用，你需要传入你的clientID，在上面的代码片段中是一个常量值（你需要声明）

Your code was missing the [signIn authenticate]; call, plust you need to also pass in your clientID, which in the above snippet is a constant value (you need to declare that)

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