自定义FBLoginView

FBLoginView *loginview = 
[[FBLoginView alloc] initWithPermissions:[NSArray arrayWithObject:@"publish_actions"]];

loginview.frame = CGRectMake(4, 95, 271, 37);
for (id obj in loginview.subviews) {
  if ([obj isKindOfClass:[UIButton class]]) {
      UIButton * loginButton = obj;
      UIImage *loginImage = [UIImage imageNamed:@"fbLogin.png"];
      [loginButton setBackgroundImage:loginImage forState:UIControlStateNormal];
      [loginButton setBackgroundImage:nil forState:UIControlStateSelected];
      [loginButton setBackgroundImage:nil forState:UIControlStateHighlighted];
      [loginButton sizeToFit];
  }
  if ([obj isKindOfClass:[UILabel class]]) {
      UILabel *loginLabel = obj;
      loginLabel.text = @"Log in to facebook";
      loginLabel.textAlignment = UITextAlignmentCenter;
      loginLabel.frame = CGRectMake(0, 0, 271, 37);
  }
}

loginview.delegate = self;
[self.view addSubview:loginview];