Flutter处理表单

官方库

使用SDK内置的Form、TextFormField等，优点是不必引入第三方库，缺点是使用有点繁琐，不适合处理大量表单页面的情况。

如果需要处理大量表单，可以使用第三方库。

第三方库

常规表单

可以使用flutter_form_builder，能避免写很多重复的代码，它内置了常规的表单类型：

• FormBuilderCheckbox - Single checkbox field
• FormBuilderCheckboxGroup - List of checkboxes for multiple selection
• FormBuilderChoiceChip - Creates a chip that acts like a radio button.
• FormBuilderDateRangePicker - For selection of a range of dates
• FormBuilderDateTimePicker - For Date, Time and DateTime input
• FormBuilderDropdown - Used to select one value from a list as a Dropdown
• FormBuilderFilterChip - Creates a chip that acts like a checkbox
• FormBuilderRadioGroup - Used to select one value from a list of Radio Widgets
• FormBuilderRangeSlider - Used to select a range from a range of values
• FormBuilderSlider - For selection of a numerical value on a slider
• FormBuilderSwitch - On/Off switch field
• FormBuilderTextField - A Material Design text field input

表单验证

建议使用与之配套的表单验证规则库：form_builder_validators

非常规表单

在以上常规表单类型之外，还有：

选取文件的表单form_builder_file_picker

选取图片的表单form_builder_image_picker

还有不常用但很炫的form_builder_extra_fields，其中包含：

• FormBuilderColorPicker - Input for Color selection
• FormBuilderRating - For selection of a numerical value as a rating
• FormBuilderSearchableDropdown - Field for selecting value(s) from a searchable list
• FormBuilderSignaturePad - Field with drawing pad on which user can doodle
• FormBuilderTouchSpin - Selection of a number by tapping on a plus or minus icon
• FormBuilderTypeAhead - Auto-completes user input from a list of items

以上都是同一个开发者的开源项目。