flutter - 如何在颤动中显示/隐藏密码？
问题描述
我已经为我的应用程序创建了一个登录屏幕，但是在密码字段中，我想要一个功能，例如当我输入密码时，它的格式是 * 格式，并且当用户单击它时，右侧会显示一个图标，密码将可见，我创建了一个代码但是当我单击密码字段时，该图标变得不可见并且当密码字段失去焦点时，该图标再次出现，那么即使密码字段处于焦点，如何始终显示该图标？我提供了一个快照以轻松理解问题。
这是我的登录屏幕代码....
import 'package:flutter/material.dart';
import 'package:email_validator/email_validator.dart';
import 'package:secret_keeper/screens/home_screen/Home.dart';
import 'package:secret_keeper/screens/home_screen/passwords/PasswordsNavigation.dart';
import 'package:secret_keeper/screens/signup_page/SignupPage.dart';
class LoginPage extends StatefulWidget{
@override
_LoginPageState createState() => _LoginPageState();
}
class _LoginPageState extends State<LoginPage> {
String _emailID, _password = "",_email = "abc@gmail.com", _pass = "Try.t.r.y@1";
bool _obscureText = true;
final _formKey = GlobalKey<FormState>();
void _toggle(){
setState(() {
_obscureText = !_obscureText;
});
}
void validateLogin(){
if(_formKey.currentState.validate()){
_formKey.currentState.save();
if(_emailID == _email && _password == _pass){
Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => Home()));
}
}
}
Widget emailInput(){
return TextFormField(
keyboardType: TextInputType.emailAddress,
decoration: InputDecoration(
labelText: "Email ID",
labelStyle: TextStyle(fontSize: 14,color: Colors.grey.shade400),
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(10),
borderSide: BorderSide(
color: Colors.grey.shade300,
),
),
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(10),
borderSide: BorderSide(
color: Colors.red,
)
),
),
validator: (email) {
if (email.isEmpty)
return 'Please Enter email ID';
else if (!EmailValidator.validate(email))
return 'Enter valid email address';
else
return null;
},
onSaved: (email)=> _emailID = email,
textInputAction: TextInputAction.next,
);
}
Widget passInput(){
return TextFormField(
keyboardType: TextInputType.text,
decoration: InputDecoration(
labelText: "Password",
labelStyle: TextStyle(fontSize: 14,color: Colors.grey.shade400),
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(10),
borderSide: BorderSide(
color: Colors.grey.shade300,
),
),
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(10),
borderSide: BorderSide(
color: Colors.red,
)
),
suffixIcon: IconButton(
icon: Icon(
_obscureText ? Icons.visibility : Icons.visibility_off,
),
onPressed: _toggle,
),
),
validator: (password){
Pattern pattern =
r'^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[!@#\$&*~]).{8,}$';
RegExp regex = new RegExp(pattern);
if (password.isEmpty){
return 'Please Enter Password';
}else if (!regex.hasMatch(password))
return 'Enter valid password';
else
return null;
},
onSaved: (password)=> _password = password,
textInputAction: TextInputAction.done,
obscureText: _obscureText,
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomPadding: false,
backgroundColor: Colors.white,
body: SafeArea(
child: Container(
padding: EdgeInsets.only(left: 16,right: 16),
child: Form(
key: _formKey,
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
SizedBox(height: 50,),
Text("Welcome,",style: TextStyle(fontSize: 26,fontWeight: FontWeight.bold),),
SizedBox(height: 6,),
Text("Sign in to continue!",style: TextStyle(fontSize: 20,color: Colors.grey.shade400),),
],
),
Column(
children: <Widget>[
emailInput(),
SizedBox(height: 16,),
passInput(),
SizedBox(height: 12,),
Align(
alignment: Alignment.topRight,
child: Text("Forgot Password ?",style: TextStyle(fontSize: 14,fontWeight: FontWeight.w600),),
),
SizedBox(height: 30,),
Container(
height: 50,
width: double.infinity,
child: FlatButton(
onPressed: validateLogin,
padding: EdgeInsets.all(0),
child: Ink(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(6),
gradient: LinearGradient(
begin: Alignment.centerLeft,
end: Alignment.centerRight,
colors: [
Color(0xffff5f6d),
Color(0xffff5f6d),
Color(0xffffc371),
],
),
),
child: Container(
alignment: Alignment.center,
constraints: BoxConstraints(maxWidth: double.infinity,minHeight: 50),
child: Text("Login",style: TextStyle(color: Colors.white,fontWeight: FontWeight.bold),textAlign: TextAlign.center,),
),
),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(6),
),
),
),
SizedBox(height: 16,),
Container(
height: 50,
width: double.infinity,
child: FlatButton(
onPressed: (){},
color: Colors.indigo.shade50,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(6),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Image.asset("assets/images/facebook.png",height: 18,width: 18,),
SizedBox(width: 10,),
Text("Connect with Facebook",style: TextStyle(color: Colors.indigo,fontWeight: FontWeight.bold),),
],
),
),
),
SizedBox(height: 16,),
Container(
height: 50,
width: double.infinity,
child: FlatButton(
onPressed: (){},
color: Colors.indigo.shade50,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(6),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Image.asset("assets/images/facebook.png",height: 18,width: 18,),
SizedBox(width: 10,),
Text("Connect with Facebook",style: TextStyle(color: Colors.indigo,fontWeight: FontWeight.bold),),
],
),
),
),
],
),
Padding(
padding: EdgeInsets.only(bottom: 10),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text("Don't have an account?",style: TextStyle(fontWeight: FontWeight.bold),),
SizedBox(width: 5,),
GestureDetector(
onTap: (){
Navigator.push(context, MaterialPageRoute(builder: (context){
return SignupPage();
}));
},
child: Text("Sign up",style: TextStyle(fontWeight: FontWeight.bold,color: Colors.red),),
)
],
),
)
],
),
),
),
),
);
}
}
解决方案
这里有两种情况
- 如果你想让你的后缀图标颜色像总是灰色一样，你可以给图标的颜色属性，比如：
密码显示隐藏按钮
var passShowButton = GestureDetector(
onLongPressEnd: outContact,
onTapDown: inContact, //call this method when incontact
onTapUp:
outContact, //call this method when contact with screen is removed
child: Icon(
getXHelper.isEmailPasswordUpdate.isTrue
? AppIcons.hidePassword
: AppIcons.hidePassword,
size: 18,
color:Colors.grey
),
);
文本域
TextField(
obscureText: getXHelper.isPassInvisible ,
autocorrect: false,
textAlignVertical: TextAlignVertical.bottom,
decoration: InputDecoration(
enabled: true,
errorBorder: UnderlineInputBorder(
borderSide: BorderSide(color: AppColors.primary)),
enabledBorder: UnderlineInputBorder(
borderSide: BorderSide(color: AppColors.primary)),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: AppColors.primary)),
border: UnderlineInputBorder(
borderSide: BorderSide(color: AppColors.primary)),
fillColor: Colors.white,
filled: true,
isDense: true,
prefixIconConstraints: BoxConstraints(maxHeight: 18, minHeight: 18),
hintText: "Password",
prefixIcon: Padding(
padding: const EdgeInsets.only(top: 0, right: 12, bottom: 0),
child: Icon(Icons.lock, size: 18, color: Colors.grey),
),
suffixIcon: passShowButton,
),
cursorColor: Colors.black,
style: TextStyle(
color: Colors.black, fontFamily: AppFontFamily.fontFamily),
)
- 如果您希望应用程序主颜色的后缀图标颜色，将在文本字段焦点时更改颜色，例如：
密码显示隐藏按钮
var passShowButton = GestureDetector(
onLongPressEnd: outContact,
onTapDown: inContact, //call this method when incontact
onTapUp:
outContact, //call this method when contact with screen is removed
child: Icon(
getXHelper.isEmailPasswordUpdate.isTrue
? AppIcons.hidePassword
: AppIcons.hidePassword,
size: 18,
),
);
TextField(
obscureText: getXHelper.isPassInvisible ,
autocorrect: false,
textAlignVertical: TextAlignVertical.bottom,
decoration: InputDecoration(
enabled: true,
errorBorder: UnderlineInputBorder(
borderSide: BorderSide(color: AppColors.primary)),
enabledBorder: UnderlineInputBorder(
borderSide: BorderSide(color: AppColors.primary)),
focusedBorder: UnderlineInputBorder(
borderSide: BorderSide(color: AppColors.primary)),
border: UnderlineInputBorder(
borderSide: BorderSide(color: AppColors.primary)),
fillColor: Colors.white,
filled: true,
isDense: true,
prefixIconConstraints: BoxConstraints(maxHeight: 18, minHeight: 18),
hintText: "Password",
prefixIcon: Padding(
padding: const EdgeInsets.only(top: 0, right: 12, bottom: 0),
child: Icon(Icons.lock, size: 18),
),
suffixIcon: passShowButton,
),
cursorColor: Colors.black,
style: TextStyle(
color: Colors.black, fontFamily: AppFontFamily.fontFamily),
)
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