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今天我完成了我的第一個應用程序，我正在測試我的應用程序。那麼，我發現了一個我從找不到它的地方找不到的錯誤。在我的應用程序中，我有兩個UITextfields。當用戶填寫其中一個時，其他自動完成使用代理方法textField:shouldChangeCharactersInRange:replacementString: 這裏是方法。當用戶在任何文本框內鍵入任何內容並按下iPad鍵盤上的撤消按鈕或晃動iPhone然後按撤消時，我的應用程序崩潰。這是我收到的錯誤。使用UITextfield崩潰並撤銷
(Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSBigMutableString substringWithRange:]: Range {0, 2} out of bounds; string length 0').
我真的很感謝你的幫助。
-(BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSString *stringToValidate = [[textField text] stringByReplacingCharactersInRange:range withString:string];
if ([stringToValidate isEqualToString:@""]) {
self.scoreToAddOfTeam1.text = nil;
self.scoreToAddOfTeam2.text = nil;
return YES;
}
if ([self validateInputsInsideAnNSString:stringToValidate]) {
if (textField == self.scoreToAddOfTeam1) {
self.scoreToAddOfTeam2.text = [self autocompleteOthersTeamPointsToAdd:stringToValidate];
} else {
self.scoreToAddOfTeam1.text = [self autocompleteOthersTeamPointsToAdd:stringToValidate];
}
} else {
if (textField == self.scoreToAddOfTeam1) {
self.scoreToAddOfTeam2.text = nil;
} else {
self.scoreToAddOfTeam1.text = nil;
}
}
return YES;
}
-(NSString *) autocompleteOthersTeamPointsToAdd: (NSString *) stringBasedToCalculate {
NSString *myString = [NSString stringWithFormat:@"%ld", (long)100 - [stringBasedToCalculate integerValue]];
return myString;
}