UIAlertView没有得到启动

Question

我想解析HTML内容使用HTMLParser和它的帮助我试图启动UIAlertView，应用程序运行正常，但不启动UIAlertView。

下面的代码：

- (IBAction) loginButton: (id) sender 
{ 

// Create the username and password string. 
// username and password are the username and password to login with 
NSString *postString = [[NSString alloc] initWithFormat:@"username=%@&password=%@",userName, password]; 
// Package the string in an NSData object 
NSData *requestData = [postString dataUsingEncoding:NSASCIIStringEncoding]; 

// Create the URL request 
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString:@"http://localhost/dologin.php"]]; // create the URL request 
[request setHTTPMethod: @"POST"]; // you're sending POST data 
[request setHTTPBody: requestData]; // apply the post data to be sent 

// Call the URL 
NSURLResponse *response; // holds the response from the server 
NSError *error; // holds any errors 
NSData *returnData = [NSURLConnection sendSynchronousRequest: request returningResponse:&response error:&error]; // call the URL 

/* If the response from the server is a web page, dataReturned will hold the string of the HTML returned. */ 

HTMLParser * parser = [[HTMLParser alloc] initWithData:returnData error:&error]; 

HTMLNode * bodyNode = [parser body]; 

NSArray * errorNodes = [bodyNode findChildTags:@"errorbox"]; 

for (HTMLNode * errorNode in errorNodes) { 
    if ([[errorNode getAttributeNamed:@"div class"] isEqualToString:@"errorbox"]){ 
     alertWithOkButton = [[UIAlertView alloc] initWithTitle:@"Status..." message:[NSString stringWithFormat:@"Invalid Access Info, try again"] delegate:self cancelButtonTitle:@"Okay" otherButtonTitles:nil]; 
     [alertWithOkButton show]; 
     [alertWithOkButton release]; 
     //Login Failed 
    } 
} 

NSArray * spanNodes = [bodyNode findChildTags:@"clientarea.php?action=masspay"]; 

for (HTMLNode * spanNode in spanNodes) { 
    if ([[spanNode getAttributeNamed:@"action"] isEqualToString:@"clientarea.php?action=masspay"]){ 
     alertWithOkButton = [[UIAlertView alloc] initWithTitle:@"Status..." message:[NSString stringWithFormat:@"Login Accepted, redirecting to the main app screen. :)"] delegate:self cancelButtonTitle:@"Okay" otherButtonTitles:@"Go",nil]; 
     [alertWithOkButton show]; 
     [alertWithOkButton release]; //Login Success 
    } 
} 

[parser release]; 

} 

Answer 1

你AlertViews似乎是适当的形成（尽管来回邮件，你不需要[的NSString stringWithFormat：]的东西，因为你没有实际格式化什么 - 只是@“你的消息”的东西是好的）。

既然它们很好，那就告诉我们，使它们出现的条件从来不会发生。您的isEqualToString比较都不是true，或者errorNodes和spanNodes都是空的，或者是这些东西的某种组合。

点击第一个为声明并设置一个断点。构建和调试，让程序运行直到达到断点。现在您可以检查并查看errorNodes和spanNodes实际包含的内容。