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POBool method to check user input
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  1. POBool method to check user input
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    copied!<p>Hi everybody i am trying to make a boolean method that will return value depending upon the user input for the field when submit button is clicked.</p> <pre><code> - (BOOL)checkuser:(NSString*)input { bool result = NO; if ([input isEqualToString:@"test"]) { result = YES; } else { result = NO; } return result; } </code></pre> <p>And i am refrencing this method from my program as </p> <pre><code>else if ([Username checkuser] == YES) { // do something } </code></pre> <p>with following warning 'NSString' may not respond to '-checkuser'</p> <p>and i am not getting why my program crashing at this point with following error.</p> <p>2011-03-22 22:57:25.942 Assignment 2[824:207] -[NSCFString checkuser]: unrecognized selector sent to instance 0x4b7c050 2011-03-22 22:57:25.944 Assignment 2[824:207] <strong>* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString checkuser]: unrecognized selector sent to instance 0x4b7c050' *</strong> Call stack at first throw: ( 0 CoreFoundation 0x00db8be9 <strong>exceptionPreprocess + 185 1 libobjc.A.dylib 0x00f0d5c2 objc_exception_throw + 47 2 CoreFoundation 0x00dba6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 3 CoreFoundation 0x00d2a366 __<em>forwarding</em></strong> + 966 4 CoreFoundation 0x00d29f22 _CF_forwarding_prep_0 + 50 5 Assignment 2 0x00002958 -[Assignment_2ViewController SubmitbuttonPressed:] + 727 6 UIKit 0x002c1a6e -[UIApplication sendAction:to:from:forEvent:] + 119 7 UIKit 0x003501b5 -[UIControl sendAction:to:forEvent:] + 67 8 UIKit 0x00352647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527 9 UIKit 0x003511f4 -[UIControl touchesEnded:withEvent:] + 458 10 UIKit 0x002e60d1 -[UIWindow _sendTouchesForEvent:] + 567 11 UIKit 0x002c737a -[UIApplication sendEvent:] + 447 12 UIKit 0x002cc732 _UIApplicationHandleEvent + 7576 13 GraphicsServices 0x016eea36 PurpleEventCallback + 1550 14 CoreFoundation 0x00d9a064 <strong>CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION</strong> + 52 15 CoreFoundation 0x00cfa6f7 __CFRunLoopDoSource1 + 215 16 CoreFoundation 0x00cf7983 __CFRunLoopRun + 979 17 CoreFoundation 0x00cf7240 CFRunLoopRunSpecific + 208 18 CoreFoundation 0x00cf7161 CFRunLoopRunInMode + 97 19 GraphicsServices 0x016ed268 GSEventRunModal + 217 20 GraphicsServices 0x016ed32d GSEventRun + 115 21 UIKit 0x002d042e UIApplicationMain + 1160 22 Assignment 2 0x00001c04 main + 102 23 Assignment 2 0x00001b95 start + 53 ) terminate called after throwing an instance of 'NSException' Program received signal: “SIGABRT”. (gdb) </p>
 

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