QML не работает на iOS

Добрый день.
Сделал проект на QML. В Windows, Android, MacOS все работает, но на iOS появляется только фон и не загружаются кнопки.
Скажите пожалуйста, почему такое может быть?
Ниже код странички, которая загружается первой:
main.qml:

import QtQuick 2.9
import QtQuick.Window 2.2

Window {
    visible: true
    width: 400
    height: 600
    title: qsTr("Psychic Training")

    color: "#cffff8"

    /
     Connections
     {
         target: dataWorking       
     }

    Loader
              {
                  id: loader
                  anchors.fill: parent
                  source: "Page0.qml"
              }
}

Page0.qml:
import QtQuick 2.4
import QtQml 2.12

Page0Form {

pag0Label1.text:  "Victories: "+ dataWorking.getWinProcent() + "%"

page0Button6.onClicked:
{
    dataWorking.toZero()
    dataWorking.setRandomNamber(1,5)
    loader.source = "Page7.qml"
}
page0Button5.onClicked:
{
    dataWorking.toZero()
    dataWorking.setRandomNamber(1,9)
    loader.source = "Page6.qml"
}
page0Button4.onClicked:
{
    dataWorking.toZero()
    dataWorking.setRandomNamber(1,4)
    loader.source = "Page5.qml"
}
page0Button3.onClicked:
{
    loader.source = "Page4.qml"
    dataWorking.toZero()
    dataWorking.setRandomNamber(1,2)
}
page0Button2.onClicked:
{
    dataWorking.toZero()
    dataWorking.setRandomNamber(1,9)
    loader.source = "Page3.qml"
}
page0Button1.onClicked:
{
    dataWorking.toZero()
    dataWorking.setRandomNamber(1,4)
    loader.source = "Page2.qml"
}
page0Button0.onClicked:
{
    dataWorking.toZero()
    dataWorking.setRandomNamber(1,2)
    loader.source = "Page1.qml"
}

}
Page0Form.ui.qml:

import QtQuick 2.4
import QtQuick.Controls 2.4
import QtQuick.Controls.Styles 1.4

Item {
    id: element
    width: 400
    height: 600
    property alias page0Button6: page0Button6
    property alias page0Button5: page0Button5
    property alias page0Button4: page0Button4
    property alias page0Button3: page0Button3
    property alias page0Button2: page0Button2
    property alias page0Button1: page0Button1
    property alias page0Button0: page0Button0
    property alias pag0Label1: pag0Label1


    Button {
        id: page0Button0
        y: parent.height * 0.16
        width: parent.width * 0.3
        height: parent.height * 0.08
        text: qsTr("1 of 2 colors") //"1 из 2 цветов"
        anchors.left: parent.left
        anchors.leftMargin: parent.width * 0.14
        //autoRepeat: false
        //display: AbstractButton.TextBesideIcon

        background: Rectangle {
            implicitWidth: 90
            implicitHeight: 30
            opacity: enabled ? 1 : 0.3
            color: "#e4e4ff"
            border.color:  "black"
            border.width: 1
            radius: 4
        }
    }

    Button {
        id: page0Button3
        x: 240
        y: parent.height * 0.16
        width: parent.width * 0.3
        height: parent.height * 0.08
        text: qsTr("1 acorn of 2") 
        anchors.right: parent.right
        anchors.rightMargin: parent.width * 0.14

        background: Rectangle {
            implicitWidth: 90
            implicitHeight: 30
            opacity: enabled ? 1 : 0.3
            color: "#e4e4ff"
            border.color:  "black"
            border.width: 1
            radius: 4
        }
    }

    Button {
        id: page0Button1
        y: parent.height * 0.31
        width: parent.width * 0.3
        height: parent.height * 0.08
        text: qsTr("1 of 4 colors") 
        anchors.left: parent.left
        anchors.leftMargin: parent.width * 0.14

        background: Rectangle {
            implicitWidth: 90
            implicitHeight: 30
            opacity: enabled ? 1 : 0.3
            color: "#e4e4ff"
            border.color:  "black"
            border.width: 1
            radius: 4
        }
    }

    Button {
        id: page0Button4
        x: 240
        y: parent.height * 0.31
        width: parent.width * 0.3
        height: parent.height * 0.08
        text: qsTr("1 acorn of 4") 
        anchors.right: parent.right
        anchors.rightMargin: parent.width * 0.14

        background: Rectangle {
            implicitWidth: 90
            implicitHeight: 30
            opacity: enabled ? 1 : 0.3
            color: "#e4e4ff"
            border.color:  "black"
            border.width: 1
            radius: 4
        }
    }

    Button {
        id: page0Button2
        y: parent.height * 0.46
        width: parent.width * 0.3
        height: parent.height * 0.08
        text: qsTr("1 of 9 colors") 
        anchors.left: parent.left
        anchors.leftMargin: parent.width * 0.14

        background: Rectangle {
            implicitWidth: 90
            implicitHeight: 30
            opacity: enabled ? 1 : 0.3
            color: "#e4e4ff"
            border.color:  "black"
            border.width: 1
            radius: 4
        }
    }

    Button {
        id: page0Button5
        x: 240
        y: parent.height * 0.46
        width: parent.width * 0.3
        height: parent.height * 0.08
        text: qsTr("1 acorn of 9") 
        anchors.right: parent.right
        anchors.rightMargin: parent.width * 0.14

        background: Rectangle {
            implicitWidth: 90
            implicitHeight: 30
            opacity: enabled ? 1 : 0.3
            color: "#e4e4ff"
            border.color:  "black"
            border.width: 1
            radius: 4
        }
    }

    Button {
        id: page0Button6
        x: 150
        y: parent.height * 0.61
        width: parent.width * 0.3
        height: parent.height * 0.08
        text: qsTr("Zener cards") 
        anchors.horizontalCenter: parent.horizontalCenter

        background: Rectangle {
            implicitWidth: 90
            implicitHeight: 30
            opacity: enabled ? 1 : 0.3
            color: "#e4e4ff"
            border.color:  "black"
            border.width: 1
            radius: 4
        }
    }

    Label {
        id: pag0Label0
        y: parent.height * 0.03
        width: parent.width * 0.7
        height: parent.height * 0.08
        horizontalAlignment: Text.AlignHCenter
        text: qsTr("Psychic Training")
        anchors.horizontalCenter: parent.horizontalCenter
        font.pointSize: 18
    }

    Label {
        id: pag0Label1
        y: parent.height * 0.78
        width: parent.width * 0.7
        height: parent.height * 0.08
        horizontalAlignment: Text.AlignHCenter
        text: qsTr("Victories: ")
        anchors.horizontalCenter: parent.horizontalCenter 
        font.pointSize: 19
    }
}



/*##^## Designer {
    D{i:1;anchors_x:58}D{i:5;anchors_x:58}D{i:9;anchors_x:58}
}
 ##^##*/