格式化美国电话

by 伍雪颖

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    NSString *toBeString = [textField.text stringByReplacingCharactersInRange:range withString:string];
    if (_phoneTextfield.isEditing) { // format american phonenum (021) 456-8901
        if (toBeString.length == 1 && range.length == 0) {
            [textField setText:[NSString stringWithFormat:@"(%@",toBeString]];
            return NO;
        }else if (toBeString.length == 5 && range.length == 0) {
            [textField setText:[NSString stringWithFormat:@"%@) %@",[toBeString substringToIndex:4],string]];
            return NO;
        }else if (toBeString.length == 10 && range.length == 0) {
            [textField setText:[NSString stringWithFormat:@"%@-%@",[toBeString substringToIndex:9],string]];
            return NO;
        }else if (toBeString.length == 15 && range.length == 0) {
            SHAKEPHONE;
            return NO;
        }else if (toBeString.length == 6 && range.length == 1) {
            [textField setText:[toBeString substringToIndex:4]];
            return NO;
        }else if (toBeString.length == 10 && range.length == 1) {
            [textField setText:[toBeString substringToIndex:9]];
            return NO;
        }else if (toBeString.length == 1 && range.length == 1) {
            [textField setText:@""];
            return NO;
        }
    }
    return YES;
}