處理iOS登錄名

Question

逐步看到下面的身份驗證后，我將如何逐步隔離用戶？

//curent code in viewcontroller2.h
-(IBAction)btnLoginRegisterTapped:(UIButton*)sender {
//form fields validation
if (fldUsername.text.length < 4 || fldPassword.text.length < 4) {
    [UIAlertView error:@"Enter username and password over 4 chars each."];
    return;
}
//salt the password
NSString* saltedPassword = [NSString stringWithFormat:@"%@%@", fldPassword.text, kSalt];
//prepare the hashed storage
NSString* hashedPassword = nil;
unsigned char hashedPasswordData[CC_SHA1_DIGEST_LENGTH];
//hash the pass
NSData *data = [saltedPassword dataUsingEncoding: NSUTF8StringEncoding];
if (CC_SHA1([data bytes], [data length], hashedPasswordData)) {
    hashedPassword = [[NSString alloc] initWithBytes:hashedPasswordData length:sizeof(hashedPasswordData) encoding:NSASCIIStringEncoding];
} else {
    [UIAlertView error:@"Password can't be sent"];
    return;
}
//check whether it's a login or register
NSString* command = (sender.tag==1)?@"register":@"login";
NSMutableDictionary* params =[NSMutableDictionary dictionaryWithObjectsAndKeys:command, @"command", fldUsername.text, @"username", hashedPassword, @"password", nil];
//make the call to the web API
[[API sharedInstance] commandWithParams:params onCompletion:^(NSDictionary *json) {
    //result returned
    NSDictionary* res = [[json objectForKey:@"result"] objectAtIndex:0];
    if ([json objectForKey:@"error"]==nil && [[res objectForKey:@"IdUser"] intValue]>0) {
        [[API sharedInstance] setUser: res];
        //this doesn't dismiss anything; its leftover from another tutorial =)
        [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
        //show message to the user
        [[[UIAlertView alloc] initWithTitle:@"Logged in" message:[NSString stringWithFormat:@"Welcome %@",[res objectForKey:@"username"]] delegate:nil cancelButtonTitle:@"Close" otherButtonTitles: nil] show];
    } else {
        //error
        [UIAlertView error:[json objectForKey:@"error"]];
    }
}];

}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

是否可以在情節提要板上連接足夠的序列並將其置於didrecevememory警告是否足夠？

if (![[API sharedInstance] isAuthorized]) {
    [self performSegueWithIdentifier:@"ShowLogin" sender:nil];
}

如何從情節提要中創建標記？ 我已經看過這3個鏈接，但是在登錄后創建序列時仍然需要一個堅定的答案。 成功登錄后的自定義segue http://www.raywenderlich.com/50308/storyboards-tutorial-in-ios-7-part-1 https://developer.apple.com/library/ios/featuredarticles/ViewControllerPGforiPhoneOS/CreatingCustomSegues/ CreatingCustomSegues.html

Answer 1

performSegueWithIdentifier是正確的。 您需要確保在主線程上執行此操作-

NSString* command = (sender.tag==1)?@"register":@"login";
NSMutableDictionary* params =[NSMutableDictionary dictionaryWithObjectsAndKeys:command, @"command", fldUsername.text, @"username", hashedPassword, @"password", nil];
//make the call to the web API
[[API sharedInstance] commandWithParams:params onCompletion:^(NSDictionary *json) {
    //result returned
    NSDictionary* res = [[json objectForKey:@"result"] objectAtIndex:0];
    if ([json objectForKey:@"error"]==nil && [[res objectForKey:@"IdUser"] intValue]>0) {
        [[API sharedInstance] setUser: res];
        dispatch_async(dispatch_get_main_queue(),^{ 
           [self performSegueWithIdentifier:@"someIdentifier" sender:self];
        });
    } else {
        //error
        [UIAlertView error:[json objectForKey:@"error"]];
    }
}];

您將需要確保“ someIdentifier”是您登錄場景中下一個場景中segue的標識符。 要創建segue，請ctrl從登錄場景中的View Controller圖標拖到目標場景，並為segue提供一個標識符。

如果要更改序列的視覺外觀，則僅需要創建自定義序列。