调用Google plus GPPSignInButton 的方法

 UIControlEvents en =[_GPPSignInButton allControlEvents];
NSArrayArr= [_GPPSignInButton actionsForTarget:_GPPSignInButton forControlEvent:en];
NSString
action = Arr[0];
[_GPPSignInButton performSelector:NSSelectorFromString(action) withObject:_GPPSignInButton afterDelay:0];

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