问题描述
我试图在XCode中为iPhone应用程序编写登录过程。问题是在NSString serverOutput下面。当我使用printf（serverOutput.UTF8String）打印它;它会打印是到控制台。但是，当我将serverOutput比较为Yes时，它不工作。任何帮助将不胜感激。这是我的代码：
I am trying to code the login process for an iPhone app in XCode. The problem is with the NSString serverOutput below. When I print it using printf(serverOutput.UTF8String); it prints 'Yes' to the console. However when I compare serverOutput to "Yes" it doesn't work. Any help would be appreciated. Here's my code:
- (IBAction) loginButton: (id) sender
{
// TODO: spawn a login thread
indicator.hidden = FALSE;
[indicator startAnimating];
NSString *post =[NSString stringWithFormat:@"username=%@&password=%@",userName.text, password.text];
NSString *hostStr = @"http://10.243.1.184/connectDB.php?";
hostStr = [hostStr stringByAppendingString:post];
NSData *dataURL = [NSData dataWithContentsOfURL: [ NSURL URLWithString: hostStr ]];
NSString *serverOutput = [[NSString alloc] initWithData:dataURL encoding: NSASCIIStringEncoding];
printf(serverOutput.UTF8String);
if([serverOutput isEqualToString:@"Yes"]){
UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Congrats" message:@"You are authorized"
delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alertsuccess show];
[alertsuccess release];
}
else {
UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Username or Password Incorrect"
delegate:self cancelButtonTitle:@"OK"otherButtonTitles:nil, nil];
[alertsuccess show];
[alertsuccess release];
//[self.navigationController pushViewController:DashboardViewController animated:YES];
loginbutton.enabled = TRUE;
}
loginbutton.enabled = FALSE;
}
推荐答案
情况我会说的问题是，服务器的响应不只是字符串是。很可能在文本之前和/或之后有一些空格。
Based on helping others with similar situations I would say the problem is that the response from the server isn't just the string "Yes". Most likely there is some whitespace before and/or after the text. Perhaps a stray newline or two.
尝试以下操作：
NSString *serverOutput = [[NSString alloc] initWithData:dataURL encoding: NSASCIIStringEncoding];
NSLog(@"Result = '%@'", serverOutput); // look for space between quotes
serverOutput = [serverOutput stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
这篇关于为什么isEqualToString不适用于NSString？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！