UITextField限制输入字符数，自定义placeholder,自定义删除

来源：互联网发布：企鹅媒体平台登录mac 编辑：程序博客网时间：2024/06/05 19:05

//创建textField

UITextField *searchTextField = [[UITextField alloc]initWithFrame:CGRectMake(30*SCREEN_SCALE, 0, backView.width-30*SCREEN_SCALE, backView.height)];

    searchTextField.borderStyle = UITextBorderStyleNone;
    searchTextField.backgroundColor = [UIColor whiteColor];
    UIColor *color = RGB(153, 153, 153);
    UIFont * font = [UIFont systemFontOfSize:15];

searchTextField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:NSLocalizedString(@"请输入关键字", nil) attributes:@{NSForegroundColorAttributeName:color,NSFontAttributeName: font}];

//输入监听

[searchTextField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];

//自定义右侧删除按钮

UIView * rightView = [[UIView alloc]initWithFrame:CGRectMake(searchTextField.width - self.height-2, (searchTextField.height-50*SCREEN_SCALE)/2, 60*SCREEN_SCALE, 50*SCREEN_SCALE)];
    rightView.backgroundColor = [UIColor whiteColor];
    rightView.userInteractionEnabled = YES;

    UIImageView *rightImageView = [[UIImageView alloc]initWithFrame:CGRectMake(8*SCREEN_SCALE, 0, 44*SCREEN_SCALE, 44*SCREEN_SCALE)];
    rightImageView.image = [UIImage imageNamed:@"ic_close_searach"];
    rightImageView.userInteractionEnabled = YES;
    [rightView addSubview:rightImageView];
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapImageView:)];
    [rightImageView addGestureRecognizer:tap];
    searchTextField.rightView = rightView;

    searchTextField.rightViewMode = UITextFieldViewModeAlways;
    [backView addSubview:searchTextField];
    self.searchTextField = searchTextField;

#pragma mark - 输入字符限制
- (void)textFieldDidChange:(UITextField *)textField
{
    NSString *toBeString = textField.text;
    NSString *lang = [[UITextInputMode currentInputMode] primaryLanguage]; // 键盘输入模式
    if ([lang isEqualToString:@"zh-Hans"]) { // 简体中文输入，包括简体拼音，健体五笔，简体手写
        UITextRange *selectedRange = [textField markedTextRange];
        //获取高亮部分
        UITextPosition *position = [textField positionFromPosition:selectedRange.start offset:0];
        // 没有高亮选择的字，则对已输入的文字进行字数统计和限制
        if (!position) {
            if (toBeString.length > kMaxLength/2) {
                textField.text = [toBeString substringToIndex:kMaxLength/2];
                [DialogUtil showDialogWithImage:nil andMessage:NSLocalizedString(@"文字不能超过30个字符", nil)];
            }
        }
        // 有高亮选择的字符串，则暂不对文字进行统计和限制
        else{

        }
    }
    // 中文输入法以外的直接对其统计限制即可，不考虑其他语种情况
    else{
        if (toBeString.length > kMaxLength) {
            textField.text = [toBeString substringToIndex:kMaxLength];
            [DialogUtil showDialogWithImage:nil andMessage:NSLocalizedString(@"字符不能超过30个字符", nil)];
        }
    }
}

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