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今天我完成了我的第一个应用程序，我正在测试我的应用程序。那么，我发现了一个我从找不到它的地方找不到的错误。在我的应用程序中，我有两个UITextfields。当用户填写其中一个时，其他自动完成使用代理方法textField:shouldChangeCharactersInRange:replacementString: 这里是方法。当用户在任何文本框内键入任何内容并按下iPad键盘上的撤消按钮或晃动iPhone然后按撤消时，我的应用程序崩溃。这是我收到的错误。使用UITextfield崩溃并撤销
(Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSBigMutableString substringWithRange:]: Range {0, 2} out of bounds; string length 0').
我真的很感谢你的帮助。
-(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;
}