您好,并提前感谢您的帮助。我一直在寻找,但无法找到答案。我只为iOS编程了一个星期。
到目前为止,Web服务的所有连接都在运行,我已经创建了一个类和方法来执行这些调用。我正在进行标准登录,用户输入登录信息,应用程序将这些值传递给Web服务,并返回一个bool值,具体取决于信息是否与数据库中的任何内容匹配。之后,应用程序获取返回值,然后移动到下一个屏幕或显示错误警报。或者至少那是我的目标。
问题在于,条件是在进行其余调用或解析响应之前执行的,而我找不到解决方案的好运。我已经阅读过有关异步和同步调用的内容,但实现它们并没有太多运气。
这是通话代码:
//Class that has the methods for calling the web services
__restObj = [[restCalls alloc] init];
bool login = [__restObj restLogin:user passwd:pass];
if (login) {
[self performSegueWithIdentifier:@"adminLogin" sender:self];
}
else{
UIAlertView*alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Incorrect group name or password." delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];
}
在实际发生POST之前执行的条件有效,并且始终为false。
这是我的方法:
- (bool)restLogin:(NSString*)user passwd:(NSString*)pass{
// Load the object model via RestKit
RKObjectManager *objectManager = [RKObjectManager sharedManager];
groupInfo *gi = [[groupInfo alloc] init];
gi.gName = user;
gi.pass = pass;
RKObjectMapping *userInfoMapping = [RKObjectMapping requestMapping];
[userInfoMapping addAttributeMappingsFromDictionary:@{@"gName": @"groupName",@"pass":@"pass"}];
RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:userInfoMapping
objectClass:[groupInfo class]
rootKeyPath:nil];
[objectManager addRequestDescriptor:requestDescriptor];
objectManager.requestSerializationMIMEType = RKMIMETypeJSON;
[objectManager postObject:gi
path:@"adminLoginIos"
parameters:nil
success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
NSArray* statuses = [mappingResult array];
NSLog(@"Loaded statuses: %@", statuses);
_result = [statuses objectAtIndex:0];
}
failure:^(RKObjectRequestOperation *operation, NSError *error) {
NSLog(@"Hit error: %@", error);
}
];
return _result;
}
在此先感谢您,请记住,我对此非常陌生,所以感谢您的帮助,如果我的代码不是最佳,请告诉我。
此致 ChmlGr
答案 0 :(得分:2)
你需要传入一个块然后在成功回调中,阻止返回_result。
基于您的结构的示例如下:
-(void) restLogin:(NSString*)user passwd:(NSString*)pass block:(void (^)(id))block {
// Load the object model via RestKit
RKObjectManager *objectManager = [RKObjectManager sharedManager];
groupInfo *gi = [[groupInfo alloc] init];
gi.gName = user;
gi.pass = pass;
RKObjectMapping *userInfoMapping = [RKObjectMapping requestMapping];
[userInfoMapping addAttributeMappingsFromDictionary:@{@"gName": @"groupName",@"pass":@"pass"}];
RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:userInfoMapping
objectClass:[groupInfo class]
rootKeyPath:nil];
[objectManager addRequestDescriptor:requestDescriptor];
objectManager.requestSerializationMIMEType = RKMIMETypeJSON;
[objectManager postObject:gi
path:@"adminLoginIos"
parameters:nil
success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
NSArray* statuses = [mappingResult array];
NSLog(@"Loaded statuses: %@", statuses);
_result = [statuses objectAtIndex:0];
block(_result);
}
failure:^(RKObjectRequestOperation *operation, NSError *error) {
NSLog(@"Hit error: %@", error);
block(nil);
}
];
}
您对该方法的调用将类似于:
[__restObj restLogin:user passwd:pass block:^(id obj) {
// do something here to translate that object into a BOOL and check value
}];
我不使用RestKit,因此我无法验证这正是您所需要的,但它应该让您走上正确的道路。也就是说,如果您想查看AFNetworking,我写了一个我不介意分享的NetworkClient包装器。