UITextField手机号中间自动空格

最新推荐文章于 2021-09-26 10:53:29 发布

原创最新推荐文章于 2021-09-26 10:53:29 发布 · 754 阅读

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本文介绍了一个UITextFieldDelegate方法的实现，该方法用于自动格式化输入的文本，在特定位置插入空格，并限制总长度不超过13个字符。通过监听UITextField的变化并进行格式调整，确保输入符合预设格式。

没时间解释了,上代码

#pragma mark - UITextFieldDelegate

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    if (textField.text.length >= 13 && string.length > range.length) {
        return NO;
    }
    NSInteger lengthChange = string.length - range.length;
    BOOL rst = YES;
    //选中区域/光标位置
    NSRange sltRange = textField.selectedRange;
    sltRange.location += lengthChange;
    NSMutableString *mtbStr;
    //删除空格则删除空格前的字符串
    if ((range.location == 3 || range.location == 8) && range.length == 1 && !string.length && [[textField.text substringWithRange:range] isEqualToString:@" "]) {
        mtbStr = [textField.text stringByReplacingCharactersInRange:NSMakeRange(range.location-1, 1) withString:string].mutableCopy;
        sltRange.location --;
    } else {
        mtbStr = [textField.text stringByReplacingCharactersInRange:range withString:string].mutableCopy;
    }
    mtbStr = [mtbStr stringByReplacingOccurrencesOfString:@" " withString:@"" options:NSBackwardsSearch range:NSMakeRange(sltRange.location, mtbStr.length - sltRange.location)].mutableCopy;
//    NSLog(@"待加空格的字符串:%@", mtbStr);
    if (mtbStr.length > 3 && ![[mtbStr substringWithRange:NSMakeRange(3, 1)] isEqualToString:@" "]) {
        [mtbStr insertString:@" " atIndex:3];
        if (sltRange.location > 3) {
            sltRange.location ++;
        }
        rst = NO;
    }
    if (mtbStr.length > 8 && ![[mtbStr substringWithRange:NSMakeRange(8, 1)] isEqualToString:@" "]) {
        [mtbStr insertString:@" " atIndex:8];
        if (sltRange.location > 8) {
            sltRange.location ++;
        }
        rst = NO;
    }
    if (!rst) {
        textField.text = mtbStr;
        textField.selectedRange = sltRange;
    }
    return rst;
}