從AlertView按鈕

應用切換視圖：從AlertView按鈕

它有3次視圖A，B，C。視圖B上有一個警報，其上有2個按鈕。

我要做的就是：

我從觀去查看B.在B，我就報警按鈕，點擊帶我回觀A.

問題：

當我點擊按鈕再次去查看B然後它給出了一個有關「isValid」計時器屬性的錯誤。定時器是聲明和使用視圖B 在其他情況下，當我使用自定義按鈕來切換A &乙然後它工作正常。

我得到的線路錯誤： BOOL dec = [timer isValid];

什麼可能是錯誤的？

警報視圖按鈕切換視圖的代碼是

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex 
{ 

     if(buttonIndex == 0) 
     { 
      [self dismissModalViewControllerAnimated:YES]; 
      } 
}

守則哪裏出了問題時出現TO相同的觀點BACK切換

-(void)viewWillAppear:(BOOL)animated 
{ 

     BOOL dec = [timer isValid]; 

     NSLog(@"TIMER CHECK"); 

     if (dec == YES) 
     { 
      [timer invalidate]; 
     }  
}

ERROR這是顯示在NSLOG是：

-[__NSCFType isValid]: unrecognized selector sent to instance 0x5996870 
2010-10-04 15:49:00.630 sqlite[5263:207] *** Terminating app due to uncaught exception  'NSInvalidArgumentException', reason: '-[__NSCFType isValid]: unrecognized selector sent to instance 0x5996870' 
*** Call stack at first throw: 
(
    0 CoreFoundation      0x023e9919 __exceptionPreprocess + 185 
    1 libobjc.A.dylib      0x025665de objc_exception_throw + 47 
    2 CoreFoundation      0x023eb42b -[NSObject(NSObject) does NotRecognizeSelector:] + 187 
    3 CoreFoundation      0x0235b116 ___forwarding___ + 966 
    4 CoreFoundation      0x0235acd2 _CF_forwarding_prep_0 + 50 
    5 sqlite        0x0000393b -[sqliteViewController viewWillAppear:] + 622 
    6 UIKit        0x0055775d -[UIWindowController transition:fromViewController:toViewController:target:didEndSelector:] + 5402 
    7 UIKit        0x0036e769 -[UIViewController presentModalViewController:withTransition:] + 2937 
    8 UIKit        0x00367a5e -[UIViewController _tryRecursivelyPresentModalViewController:withTransition:] + 134 
    9 UIKit        0x0036df42 -[UIViewController presentModalViewController:withTransition:] + 850 
    10 sqlite        0x00005d8a -[StartPageViewController startQuiz:] + 68 
    11 UIKit        0x002c2e14 -[UIApplication sendAction:to:from:forEvent:] + 119 
    12 UIKit        0x0034c6c8 -[UIControl sendAction:to:forEvent:] + 67 
    13 UIKit        0x0034eb4a -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527 
    14 UIKit        0x0034d6f7 -[UIControl touchesEnded:withEvent:] + 458 
    15 UIKit        0x002e62ff -[UIWindow _sendTouchesForEvent:] + 567 
    16 UIKit        0x002c81ec -[UIApplication sendEvent:] + 447 
    17 UIKit        0x002ccac4 _UIApplicationHandleEvent + 7495 
    18 GraphicsServices     0x02c04afa PurpleEventCallback + 1578 
    19 CoreFoundation      0x023cadc4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52 
    20 CoreFoundation      0x0232b737 __CFRunLoopDoSource1 + 215 
    21 CoreFoundation      0x023289c3 __CFRunLoopRun + 979  
    22 CoreFoundation      0x02328280 CFRunLoopRunSpecific + 208 
    23 CoreFoundation      0x023281a1 CFRunLoopRunInMode + 97 
    24 GraphicsServices     0x02c032c8 GSEventRunModal + 217 
    25 GraphicsServices     0x02c0338d GSEventRun + 115 
    26 UIKit        0x002d0b58 UIApplicationMain + 1160 
    27 sqlite        0x00002910 main + 102 
    28 sqlite        0x000028a1 start + 53 
) 
terminate called after throwing an instance of 'NSException'

來源

2010-10-04 Parth Bhatt

找到它的原因。我試圖使已經失效的計時器失效。謝謝反正

來源

2010-10-13 09:45:53

從AlertView按鈕

回答

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