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我有一个plist带有Array标题和item0,item1的item2字典来存储我的应用程序的标题和密码。现在我想检查登录过程

进入这里 现在我想检查通过，当我按下提交按钮登录时，项目应该匹配。我尝试了下面的代码，但 xcode 崩溃

-(void)authenticateCredentials 
{ 
NSMutableArray *plistArray = [NSMutableArray arrayWithArray:[self readFromPlist]]; 

for (int i = 0; i< [plistArray count]; i++) 
{ 
 if ([[[plistArray   objectAtIndex:i]objectForKey:@"pass"]isEqualToString:emailTextFeild.text] && [[[plistArray objectAtIndex:i]objectForKey:@"title"]isEqualToString:passwordTextFeild.text]) 
{ 
NSLog(@"Correct credentials"); 
 return;
} 
   NSLog(@"INCorrect credentials"); 
 } 
 }

和

-(NSArray*)readFromPlist
 {
   NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
  NSUserDomainMask, YES); 
  NSString *documentsDirectory = [documentPaths objectAtIndex:0];
 NSString *documentPlistPath = [documentsDirectory stringByAppendingPathComponent:@"XYZ.plist"];

   NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:documentPlistPath];

   NSArray *valueArray = [dict objectForKey:@"title"];

   return valueArray;

 }

xcode 崩溃了..请检查 -(void)authenticateCredentials我不正确的地方？

并且 当我选择submit按钮时崩溃，它不会在 nslog 中给出任何正确或不正确的输出，Xcode然后崩溃，带有错误

 2012-12-14 12:10:45.142 NavTutorial[1661:f803] emailEntry: hi@gmail.com.com
2012-12-14 12:10:45.145 NavTutorial[1661:f803] passwordEntry: hellohello
2012-12-14 12:10:45.153 NavTutorial[1661:f803] -[__NSCFConstantString objectForKey:]:   unrecognized selector sent to instance 0x1568cd8
2012-12-14 12:10:45.155 NavTutorial[1661:f803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFConstantString objectForKey:]:     unrecognized selector sent to instance 0x1568cd8'
 *** First throw call stack:
(0x14d7052 0x11c2d0a 0x14d8ced 0x143df00 0x143dce2 0x3981 0x14d8ec9 0x3735c2 0x37355a 0x418b76 0x41903f 0x417e22 0x39893f 0x398c56 0x37f384 0x372aa9 0x1bcdfa9 0x14ab1c5 0x1410022 0x140e90a 0x140ddb4 0x140dccb 0x1bcc879 0x1bcc93e 0x370a9b 0x211d 0x2095 0x1)
terminate called throwing an exception

两天前，同样的代码运行良好

如果我将断点设置为条件，IF稍后如果在条件之后失败。

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1 回答 1

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authenticateCredentials如下所示修改您的并检查它是否正常工作。如果它显示错误消息为Error! Not a dictionary，您需要检查您的 plist 是否具有正确的结构。大多数情况下，您[objDict objectForKey:@"pass"]返回的是不同的数据类型。

- (void)authenticateCredentials {
    NSMutableArray *plistArray = [NSMutableArray arrayWithArray:[self readFromPlist]];

    for (int i = 0; i< [plistArray count]; i++)
    {
        id object = [plistArray objectAtIndex:i];

        if ([object isKindOfClass:[NSDictionary class]]) {
            NSDictionary *objDict = (NSDictionary *)object;

            if ([[objDict objectForKey:@"pass"] isEqualToString:emailTextFeild.text] && [[objDict objectForKey:@"title"] isEqualToString:passwordTextFeild.text])
            {
                NSLog(@"Correct credentials");
                return;
            }
            NSLog(@"INCorrect credentials");
        } else {
             NSLog(@"Error! Not a dictionary");
        }
    }
}
于 2012-12-14T07:09:19.957 回答