JULIUS
Reputation: 121
Flutter application crashes at startup on iPhone
I wrote a basic calculator app with flutter and installed it on my iphone with Xcode. I builded the app and trusted the developer in the iPhone settings. But when I want to open the app it crashes after about 2 seconds of my background screen in blurry. I don't know what is wrong the app runs on the simulator. I don't know if the code is to bad written or if I missed some configuration steps. Has somebody experience with that...
Thank you for your help.
Device Log/ Crash:
{
"crashReporterKey" : "771e2f68485128ac7de5b4f2d3a557289be32a15",
"kernel" : "Darwin Kernel Version 20.0.0: Fri Aug 28 23:07:00 PDT 2020; root:xnu-7195.0.46~9\/RELEASE_ARM64_T8020",
"product" : "iPhone11,2",
"incident" : "E2C76AF9-8284-47F9-962E-FE6DB1D9AD19",
"date" : "2020-09-28 21:24:44.54 +0200",
"build" : "iPhone OS 14.0.1 (18A393)",
"timeDelta" : 6,
"memoryStatus" : {
"compressorSize" : 29314,
"compressions" : 1810481,
"decompressions" : 1202975,
"zoneMapCap" : 1454407680,
"largestZone" : "APFS_4K_OBJS",
"largestZoneSize" : 35880960,
"pageSize" : 16384,
"uncompressed" : 79755,
"zoneMapSize" : 162873344,
"memoryPages" : {
"active" : 75993,
"throttled" : 0,
Flutter Code
import 'package:flutter/material.dart';
void main() {
runApp(Calculator());
}
class Calculator extends StatefulWidget {
@override
_CalculatorState createState() => _CalculatorState();
}
class _CalculatorState extends State<Calculator> {
String _num1 = "";
String _operator = "";
String _num2 = "";
String _show = "";
bool _set_show_to_none = false;
bool _isNum2 = false;
void press_0_button_num1() {
setState(() {
_num1 += "0";
_show += "0";
});
}
void press_1_button_num1() {
setState(() {
_num1 += "1";
_show += "1";
});
}
void press_2_button_num1() {
setState(() {
_num1 += "2";
_show += "2";
});
}
void press_3_button_num1() {
setState(() {
_num1 += "3";
_show += "3";
});
}
void press_4_button_num1() {
setState(() {
_num1 += "4";
_show += "4";
});
}
void press_5_button_num1() {
setState(() {
_num1 += "5";
_show += "5";
});
}
void press_6_button_num1() {
setState(() {
_num1 += "6";
_show += "6";
});
}
void press_7_button_num1() {
setState(() {
_num1 += "7";
_show += "7";
});
}
void press_8_button_num1() {
setState(() {
_num1 += "8";
_show += "8";
});
}
void press_9_button_num1() {
setState(() {
_num1 += "9";
_show += "9";
});
}
void press_0_button_num2() {
setState(() {
if (_set_show_to_none){
_show = "";}
_num2 += "0";
_show += "0";
_set_show_to_none = false;
});
}
void press_1_button_num2() {
setState(() {
if (_set_show_to_none){
_show = "";}
_num2 += "1";
_show += "1";
_set_show_to_none = false;
});
}
void press_2_button_num2() {
setState(() {
if (_set_show_to_none){
_show = "";}
_num2 += "2";
_show += "2";
_set_show_to_none = false;
});
}
void press_3_button_num2() {
setState(() {
if (_set_show_to_none){
_show = "";}
_num2 += "3";
_show += "3";
_set_show_to_none = false;
});
}
void press_4_button_num2() {
setState(() {
if (_set_show_to_none){
_show = "";}
_num2 += "4";
_show += "4";
_set_show_to_none = false;
});
}
void press_5_button_num2() {
setState(() {
if (_set_show_to_none){
_show = "";}
_num2 += "5";
_show += "5";
_set_show_to_none = false;
});
}
void press_6_button_num2() {
setState(() {
if (_set_show_to_none){
_show = "";}
_num2 += "6";
_show += "6";
_set_show_to_none = false;
});
}
void press_7_button_num2() {
setState(() {
if (_set_show_to_none){
_show = "";}
_num2 += "7";
_show += "7";
_set_show_to_none = false;
});
}
void press_8_button_num2() {
setState(() {
if (_set_show_to_none){
_show = "";}
_num2 += "8";
_show += "8";
_set_show_to_none = false;
});
}
void press_9_button_num2() {
setState(() {
if (_set_show_to_none){
_show = "";}
_num2 += "9";
_show += "9";
_set_show_to_none = false;
});
}
void press_plus_button() {
setState(() {
_operator = "+";
_show = "+";
_set_show_to_none = true;
_isNum2 = true;
});
}
void press_minus_button() {
setState(() {
_operator = "-";
_show = "-";
_set_show_to_none = true;
_isNum2 = true;
});
}
void press_multiple_button() {
setState(() {
_operator = "*";
_show = "*";
_set_show_to_none = true;
_isNum2 = true;
});
}
void press_divided_button() {
setState(() {
_operator = "/";
_show = "/";
_set_show_to_none = true;
_isNum2 = true;
});
}
void press_ac_button() {
setState(() {
_num1 = "";
_operator = "";
_num2 = "";
_show = "";
_set_show_to_none = false;
_isNum2 = false;
});
}
void calculate() {
setState(() {
int num1int = int.tryParse(_num1);
int num2int = int.tryParse(_num2);
double num1do = num1int.toDouble();
double num2do = num2int.toDouble();
double result = 0;
if (_operator == "+") {
result = num1do + num2do;
}
else if (_operator == "-") {
result = num1do - num2do;
}
else if (_operator == "*") {
result = num1do * num2do;
}
else if (_operator == "/") {
result = num1do / num2do;
}
RegExp regex = RegExp(r"([.]*0)(?!.*\d)");
String result_output = result.toString().replaceAll(RegExp(r"([.]*0)(?!.*\d)"), "");
_show = result_output;
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
body: Column(
children: <Widget>[
SizedBox(
height: 98,
),
Expanded(
child: Align(
alignment: Alignment.centerRight,
child: Text(_show,
textAlign: TextAlign.right,
style: TextStyle(fontSize: 130)),
),
),
Row(
children: [
Container(
padding: const EdgeInsets.all(10.0),
child: SizedBox(
height: 70,
width: 150,
child: FloatingActionButton.extended(
elevation: 0.2,
onPressed: () {
press_ac_button();
},
label: Text("AC"),
isExtended: true,
),
),
),
],
),
SizedBox(
height: 20,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
if (_isNum2) {
press_1_button_num2();
} else {
press_1_button_num1();
}
},
child: Text("1"),
),
),
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
if (_isNum2) {
press_2_button_num2();
} else {
press_2_button_num1();
}
},
child: Text("2"),
),
),
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
if (_isNum2) {
press_3_button_num2();
} else {
press_3_button_num1();
}
},
child: Text("3"),
),
),
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
press_plus_button();
},
child: Text("+"),
),
),
],
),
SizedBox(
height: 20,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
if (_isNum2) {
press_4_button_num2();
} else {
press_4_button_num1();
}
},
child: Text("4"),
),
),
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
if (_isNum2) {
press_5_button_num2();
} else {
press_5_button_num2();
}
},
child: Text("5"),
),
),
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
if (_isNum2) {
press_6_button_num2();
} else {
press_6_button_num1();
}
},
child: Text("6"),
),
),
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
press_minus_button();
},
child: Text("-"),
),
),
],
),
SizedBox(
height: 20,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
if (_isNum2) {
press_7_button_num2();
} else {
press_7_button_num1();
}
},
child: Text("7"),
),
),
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
if (_isNum2) {
press_8_button_num2();
} else {
press_8_button_num1();
}
},
child: Text("8"),
),
),
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
if (_isNum2) {
press_9_button_num2();
} else {
press_9_button_num1();
}
},
child: Text("9"),
),
),
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
press_multiple_button();
},
child: Text("*"),
),
),
],
),
SizedBox(
height: 3,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
SizedBox(
height: 90,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
if (_isNum2) {
press_0_button_num2();
} else {
press_0_button_num1();
}
},
child: Text("0"),
isExtended: true,
),
),
SizedBox(
height: 75,
width: 180,//290
child: FloatingActionButton.extended(
elevation: 0.2,
onPressed: () {
calculate();
},
label: Text("="),
isExtended: true,
),
),
SizedBox(
height: 100,
width: 90,
child: FloatingActionButton(
elevation: 0.2,
onPressed: () {
press_divided_button();
},
child: Text("/"),
),
)
],
),
SizedBox(height: 47.5),
],
),
),
);
}
}
I have two errors in Xcode:
Upvotes: 0
Views: 207
Answers (1)
bm888
Reputation: 555
Go into xcode and change your Bundle Identifier to something like this using your own website name.
com.mywebsitename.calculator
Upvotes: 1
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