在Parse文档中,它表示您可以检查用户是否链接到Facebook帐户,但有没有办法可以反过来?例如,假设用户单击按钮以使用Facebook登录,因为[PFUser currentUser
]为零(因为用户尚未登录),Parse将为该用户创建一个新帐户,因为您不能使用[PFFacebookUtils isLinkedWithUser: [PFUser currentUser]]
。似乎链接帐户的唯一方法是在用户定期登录后(即输入用户名和密码),但这确实很不方便。如果用户已经手动创建了一个帐户(通过填写我提供的注册表单)然后决定链接他们的Facebook帐户怎么办?那么无论如何都要检查Facebook帐户是否与用户链接而不是针对特定用户进行检查?
答案 0 :(得分:0)
好的,这是解决方案。基本上遍历每个用户,看看Facebook帐户是否与之相关联。基于此,链接或创建一个新帐户。这是代码:
PFQuery *userQuery = [PFUser query];
[userQuery findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
NSUInteger count = [objects count];
BOOL linked = NO;
for(NSUInteger i = 0; i < count; i++){
PFUser *checkUser = objects[i];
if([PFFacebookUtils isLinkedWithUser:checkUser]){
linked = YES;
NSLog(@"profile is linked to a user");
break;
}
}
if(linked == YES){
[PFFacebookUtils logInWithPermissions:_permissions block:^(PFUser *user, NSError *error) {
if(!user){
NSLog(@"facebook cancelled");
}
else{
_type = @"twitter";
[self performSegueWithIdentifier:@"showMain" sender:self]; }
}
];
}
else{
CCAlertView *ask = [[CCAlertView alloc]initWithTitle:@"Are you already registered" message:nil];
[ask addButtonWithTitle:@"No" block:^{
[PFFacebookUtils logInWithPermissions:_permissions block:^(PFUser *user, NSError *error) {
if(!user){
NSLog(@"Facebook cancelled");
}
else if(user.isNew){
_type = @"facebook";
[self performSegueWithIdentifier:@"showMain" sender:self]; }
else{
[self performSegueWithIdentifier:@"showMain" sender:self]; }
}];
}];
[ask addButtonWithTitle:@"Yes" block:^{
CCAlertView *log = [[CCAlertView alloc]initWithTitle:@"Enter username and password" message:nil];
[log setAlertViewStyle:UIAlertViewStyleLoginAndPasswordInput];
UITextField *un = [log textFieldAtIndex:0];
UITextField *pw = [log textFieldAtIndex:1];
[log addButtonWithTitle:@"Cancel" block:nil];
[log addButtonWithTitle:@"Enter" block:^{
[PFUser logInWithUsernameInBackground:[un text] password:[pw text] block:^(PFUser *user, NSError *error) {
if(user){
[PFFacebookUtils linkUser:user permissions:_permissions block:^(BOOL succeeded, NSError *error) {
if(succeeded){
NSLog(@"linked");
[self performSegueWithIdentifier:@"showMain" sender:self]; }
else{
NSLog(@"couldnt link");
}
}];
}
else{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Oops!" message:[error userInfo] delegate:self cancelButtonTitle:nil otherButtonTitles:@"okay", nil];
[alert show];
}
}];
}];
[log show];
}];
[ask show];
}
}];