沒有數據進入變量，請幫助嗎？ iPhone iOS - Objective-C

嗨，大家好，我試圖從全局變量中取值，並將它們放入電子郵件中，我將包含我的源代碼和錯誤消息。提前致謝！沒有數據進入變量，請幫助嗎？ iPhone iOS - Objective-C

MFMailComposeViewController *compose = [[MFMailComposeViewController alloc] init]; 
compose.mailComposeDelegate = self; 

[compose setSubject:@"Float Plan for my Boat Trip"]; 
[compose setCcRecipients:[NSArray arrayWithObject:@"[email protected]"]]; 

NSString *emailFileName = [NSString stringWithFormat:@"email_en_US.html"]; 
NSString *emailFilePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: emailFileName]; 
NSString *body = [NSString stringWithContentsOfFile:emailFilePath encoding:NSUTF8StringEncoding error:nil]; 

body = [body stringByReplacingOccurrencesOfString:@"//PERSON//" withString:@"person"]; 
body = [body stringByReplacingOccurrencesOfString:@"//POB//" withString:pob]; 
body = [body stringByReplacingOccurrencesOfString:@"//PHONE//" withString:phone]; 
body = [body stringByReplacingOccurrencesOfString:@"//MEDICAL//" withString:medical]; 
body = [body stringByReplacingOccurrencesOfString:@"//DEPART//" withString:depart]; 
body = [body stringByReplacingOccurrencesOfString:@"//LEFT//" withString:left]; 
body = [body stringByReplacingOccurrencesOfString:@"//ARRIVAL//" withString:arrive]; 
body = [body stringByReplacingOccurrencesOfString:@"//DESTINATION//" withString:destination]; 


body = [body stringByReplacingOccurrencesOfString:@"//VESSELNAME//" withString:vessel_name]; 
body = [body stringByReplacingOccurrencesOfString:@"//BUILDERMAKE//" withString:builder_make]; 
body = [body stringByReplacingOccurrencesOfString:@"//LENGTH//" withString:length]; 
body = [body stringByReplacingOccurrencesOfString:@"//HULLCOLOUR//" withString:colour]; 
body = [body stringByReplacingOccurrencesOfString:@"//NUMBER//" withString:number]; 
body = [body stringByReplacingOccurrencesOfString:@"//POWER//" withString:power]; 
body = [body stringByReplacingOccurrencesOfString:@"//RIG//" withString:rig]; 


NSString *emailBody = body; 
[compose setMessageBody:emailBody isHTML:YES]; 

compose.navigationBar.barStyle = UIBarStyleBlack; 

[self presentModalViewController:compose animated:YES]; 
[compose release];

，這裏是，即時通訊在控制檯獲取錯誤，瞬間我按下電子郵件click事件

2011-02-28 18:26:34.595 Tow Boat 911[35121:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFString stringByReplacingOccurrencesOfString:withString:options:range:]: nil argument' 
*** Call stack at first throw: 
(
0 CoreFoundation      0x00f6abe9 __exceptionPreprocess + 185 
1 libobjc.A.dylib      0x00d5f5c2 objc_exception_throw + 47 
2 CoreFoundation      0x00f23628 +[NSException raise:format:arguments:] + 136 
3 CoreFoundation      0x00f2359a +[NSException raise:format:] + 58 
4 Foundation       0x0004f3c0 -[NSString stringByReplacingOccurrencesOfString:withString:options:range:] + 123 
5 Foundation       0x0004f33e -[NSString stringByReplacingOccurrencesOfString:withString:] + 99 
6 Tow Boat 911      0x00001ec5 -[FloatPlan email:] + 477 
7 UIKit        0x002b8a6e -[UIApplication sendAction:to:from:forEvent:] + 119 
8 UIKit        0x003471b5 -[UIControl sendAction:to:forEvent:] + 67 
9 UIKit        0x00349647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527 
10 UIKit        0x00348438 -[UIControl touchesBegan:withEvent:] + 277 
11 UIKit        0x002dd025 -[UIWindow _sendTouchesForEvent:] + 395 
12 UIKit        0x002be37a -[UIApplication sendEvent:] + 447 
13 UIKit        0x002c3732 _UIApplicationHandleEvent + 7576 
14 GraphicsServices     0x01781a36 PurpleEventCallback + 1550 
15 CoreFoundation      0x00f4c064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52 
16 CoreFoundation      0x00eac6f7 __CFRunLoopDoSource1 + 215 
17 CoreFoundation      0x00ea9983 __CFRunLoopRun + 979 
18 CoreFoundation      0x00ea9240 CFRunLoopRunSpecific + 208 
19 CoreFoundation      0x00ea9161 CFRunLoopRunInMode + 97 
20 GraphicsServices     0x01780268 GSEventRunModal + 217 
21 GraphicsServices     0x0178032d GSEventRun + 115 
22 UIKit        0x002c742e UIApplicationMain + 1160 
23 Tow Boat 911      0x00001a8c main + 102 
24 Tow Boat 911      0x00001a1d start + 53 
) 
terminate called after throwing an instance of 'NSException' 
Program received signal: 「SIGABRT」. 
(gdb)

來源

2011-02-28 TowBoat911

您可能會考慮使用'NSMutableString'並對就地字符串進行編輯，因爲'stringByReplacingOccurrencesOfString：withString：'每次調用時都會創建一個新的字符串對象。 – dreamlax 2011-03-01 00:22:39

你在哪裏定義你用作替換的字符串（pob，phone，medical，depart ...）？如果這些都是零，你可以得到上面的例外。 – 2011-03-01 01:28:13

你的一個全局變量是零。在「運行」菜單中的XCode中，可以啓用「在Objective-C異常中停止」選項，並且在拋出異常時調試器將停止。然後，您可以在XCode中使用適當的下拉列表確切找出導致問題的哪條線。

來源

2011-02-28 23:40:39 Anomie

沒有數據進入變量，請幫助嗎？ iPhone iOS - Objective-C

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