AFnetworking waitUntilFinish无法正常工作 [英] AFnetworking waitUntilFinish not working
问题描述
我正在制作一个使用AFNetworking库的项目。我用它来检查Web服务的登录名和密码。如果可以的话，这会给我200码。如果是200，则将布尔值设置为true，以便应用程序可以继续。但是此布尔值未在正确的时间设置。我总是需要在登录按钮上按两次。这是设置布尔值的代码。
I am making a project that uses the AFNetworking Library. I use it to check for a login and password with the webservice. This gives me a 200-code back if it is ok. If it is 200, I set a boolean to true so that the application can continue. But this boolean is not set at the right time. I always need to press two times on my login button before it works. Here is my code to set the boolean.
- (BOOL)credentialsValidated {
self.progressHUD = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
self.progressHUD.labelText = @"Loading";
self.progressHUD.mode = MBProgressHUDModeIndeterminate;
self.progressHUD.dimBackground = YES;
[[API sharedInstance] loginCommand:[NSMutableDictionary dictionaryWithObjectsAndKeys:_txtLogin.text,@"email",_txtPass.text,@"pwd", nil] onCompletion:^(NSDictionary *json){
//completion
if(![json objectForKey:@"error"]){
NSLog(@"status %@",[json valueForKeyPath:@"data.status"]);
if([[json valueForKeyPath:@"data.status"]intValue] == 200){
//Create user object
_loginstatus = YES;
[self.progressHUD hide:YES afterDelay:5];
}else{
//show validation
_txtLogin.text = @"";
_txtPass.text = @"";
_loginstatus = NO;
}
}else {
NSLog(@"Cannot connect to the server");
}
}];
if(_loginstatus){
NSLog(@"true");
}else{
NSLog(@"false");
}
[self.progressHUD hide:YES afterDelay:5];
return _loginstatus;
}
这是我的API代码。
-(void)loginCommand:(NSMutableDictionary *)params onCompletion:(JSONResponseBlock)completionBlock{
NSLog(@"%@%@",kAPIHost,kAPILogin);
NSMutableURLRequest *apiRequest = [self multipartFormRequestWithMethod:@"POST" path:kAPILogin parameters:params constructingBodyWithBlock:^(id <AFMultipartFormData>formData){
//TODO: attach file if needed
}];
AFJSONRequestOperation *operation = [[AFJSONRequestOperation alloc] initWithRequest:apiRequest];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject){
//success !
NSLog(@"SUCCESSSS!");
completionBlock(responseObject);
}failure:^(AFHTTPRequestOperation *operation, NSError *error){
//Failure
NSLog(@"FAILUREE!");
completionBlock([NSDictionary dictionaryWithObject:[error localizedDescription] forKey:@"error"]);
}];
[operation start];
}
当我放在以下时[开始] [operation waitUntilFinish] 代码，应用崩溃。
When I put below [operation start] the [operation waitUntilFinish] code, the app crashes.
有人可以帮我吗？
亲切的问候
日志
这是我两次登录后我的日志的打印
LOG Here is a print of my log after I 2 two times pressed the login button
2012-12-28 09:36:00.547 Offitel[6532:907] http://virtuele-receptie.******.sanmax.be/nl/webservice/company-user/****/*****/**************
2012-12-28 09:36:00.561 Offitel[6532:907] false
2012-12-28 09:36:01.604 Offitel[6532:907] SUCCESSSS!
2012-12-28 09:36:01.605 Offitel[6532:907] status 200
2012-12-28 09:36:20.742 Offitel[6532:907] aanmelden pressed
2012-12-28 09:36:20.746 Offitel[6532:907] http://virtuele-receptie.******.sanmax.be/nl/webservice/company-user/****/*****/**************
2012-12-28 09:36:20.748 Offitel[6532:907] true
2012-12-28 09:36:22.184 Offitel[6532:907] SUCCESSSS!
2012-12-28 09:36:22.184 Offitel[6532:907] status 200
推荐答案
如果执行此操作
return _loginstatus;
您没有等待操作完成，因此您没有返回服务器要发送到的内容你的申请。在这种情况下，我通常要做的是在触发登录操作时显示 UIActivityIndicator ，并且在服务器响应之前不执行任何操作。然后，我为所有变量设置适当的值，在这种情况下，我会选择进入主屏幕。
You are not waiting the operation to finish, so you're not returning what your server is sending to your application. What I usually do in this cases is display an UIActivityIndicator when the login action is fired, and do nothing till' the server has responded. Then, I set the proper values to any variables and in this case I would segue to home screen.
请记住，当您使用 AFNetworking时您始终在做异步操作。
Remember that when you're using AFNetworking you are always doing async stuff.
编辑
代码示例：
- (void)loginActionWithPassword:(NSString *)pass
{
// Add progress HUD to show feedback
// I'm using MBProgressHUD library: https://github.com/jdg/MBProgressHUD#readme
self.progressHUD = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
self.progressHUD.labelText = @"Loading";
self.progressHUD.mode = MBProgressHUDModeIndeterminate;
self.progressHUD.dimBackground = YES;
// Launch the action to the server
[Actions loginWithEmail:[self.textEmail.text lowercaseString] andPassword:pass success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
if ([Actions requestFailed:JSON]) {
LOG(@"ERROR %@ / %@ / %@ \n", pass, request, response, JSON);
if ([JSON[@"MSG"] isEqualToString:@"USER_NOT_REGISTERED"]) {
self.progressHUD.labelText = @"User doesn't exist";
self.textEmail.text = @"";
self.textPassword.text = @"";
} else if ([JSON[@"MSG"] isEqualToString:@"PASSWORD_INCORRECT"]) {
self.progressHUD.labelText = @"Wrong password";
self.textPassword.text = @"";
}
[self.progressHUD hide:YES afterDelay:[Utils hudDuration]];
return;
}
// If everything went OK, go to this function to save user data
// and perform segue to home screen (or dismiss modal login view)
[self onLoginSuccessWithPassword:pass JSON:JSON response:response];
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
// If something fails, display an error message
LOG(@"ERROR:(%@): %@ / %@ / %@ / %@ \n", pass, request, response, error, JSON);
self.progressHUD.labelText = @"Something went wrong, try again";
[self.progressHUD hide:YES afterDelay:[Utils hudDuration]];
return;
}];
}
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