当我在字符串中插入换行符时，Xcode会抛出各种错误。例如，这失败了:if(newMaximumNumberOfSides>12){NSLog(@"Invalidmaximumnumberofsides:%iisgreaterthanthemaximumof12allowed.",newMaximumNumberOfSides);}但这行得通:if(newMaximumNumberOfSides>12){NSLog(@"Invalidmaximumnumberofsides:%iisgreaterthanthemaximumof12allowed.",newMaximumNumberO