iOS: let qmake generate default LaunchScreen.xib

iOS8 will check if the app has a LaunchScreen.xib to determine
if it supports iPhone6/6+ (scale factor and resolution). So
we follow the same pattern as we do with the launch image for
iPhone5, and generate a default LaunchScreen.xib.

The xib file in this patch is a copy of a default file
generated by a native Xcode project (with quotes escaped), but
with the text label set to be $$TARGET.

Change-Id: I163ab48b6f4edea4cc1f6840a1f3d8b3cc0326db
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>

mkspecs/macx-ios-clang/Info.plist.app

@@ -24,6 +24,8 @@
 	<string>1.0</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
 	<key>UISupportedInterfaceOrientations</key>
 	<array>
 		<string>UIInterfaceOrientationPortrait</string>

mkspecs/macx-ios-clang/LaunchScreen.xib

@@ -0,0 +1,45 @@
+<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>
+<document type=\"com.apple.InterfaceBuilder3.CocoaTouch.XIB\" version=\"3.0\" toolsVersion=\"6250\" systemVersion=\"14A343f\" targetRuntime=\"iOS.CocoaTouch\" propertyAccessControl=\"none\" useAutolayout=\"YES\" launchScreen=\"YES\" useTraitCollections=\"YES\">
+    <dependencies>
+        <plugIn identifier=\"com.apple.InterfaceBuilder.IBCocoaTouchPlugin\" version=\"6244\"/>
+        <capability name=\"Constraints with non-1.0 multipliers\" minToolsVersion=\"5.1\"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier=\"IBFilesOwner\" id=\"-1\" userLabel=\"File\'s Owner\"/>
+        <placeholder placeholderIdentifier=\"IBFirstResponder\" id=\"-2\" customClass=\"UIResponder\"/>
+        <view contentMode=\"scaleToFill\" id=\"iN0-l3-epB\">
+            <rect key=\"frame\" x=\"0.0\" y=\"0.0\" width=\"480\" height=\"480\"/>
+            <autoresizingMask key=\"autoresizingMask\" widthSizable=\"YES\" heightSizable=\"YES\"/>
+            <subviews>
+                <label opaque=\"NO\" clipsSubviews=\"YES\" userInteractionEnabled=\"NO\" contentMode=\"left\" horizontalHuggingPriority=\"251\" verticalHuggingPriority=\"251\" misplaced=\"YES\" text=\"\" textAlignment=\"center\" lineBreakMode=\"tailTruncation\" baselineAdjustment=\"alignBaselines\" minimumFontSize=\"9\" translatesAutoresizingMaskIntoConstraints=\"NO\" id=\"8ie-xW-0ye\">
+                    <rect key=\"frame\" x=\"20\" y=\"439\" width=\"441\" height=\"21\"/>
+                    <fontDescription key=\"fontDescription\" type=\"system\" pointSize=\"17\"/>
+                    <color key=\"textColor\" cocoaTouchSystemColor=\"darkTextColor\"/>
+                    <nil key=\"highlightedColor\"/>
+                    <variation key=\"widthClass=compact\">
+                        <fontDescription key=\"fontDescription\" type=\"system\" pointSize=\"11\"/>
+                    </variation>
+                </label>
+                <label opaque=\"NO\" clipsSubviews=\"YES\" userInteractionEnabled=\"NO\" contentMode=\"left\" horizontalHuggingPriority=\"251\" verticalHuggingPriority=\"251\" text=\"$$TARGET\"
+                    textAlignment=\"center\" lineBreakMode=\"middleTruncation\" baselineAdjustment=\"alignBaselines\" minimumFontSize=\"18\" translatesAutoresizingMaskIntoConstraints=\"NO\" id=\"kId-c2-rCX\">
+                    <rect key=\"frame\" x=\"20\" y=\"140\" width=\"441\" height=\"43\"/>
+                    <fontDescription key=\"fontDescription\" type=\"boldSystem\" pointSize=\"36\"/>
+                    <color key=\"textColor\" cocoaTouchSystemColor=\"darkTextColor\"/>
+                    <nil key=\"highlightedColor\"/>
+                </label>
+            </subviews>
+            <color key=\"backgroundColor\" white=\"1\" alpha=\"1\" colorSpace=\"custom\" customColorSpace=\"calibratedWhite\"/>
+            <constraints>
+                <constraint firstItem=\"kId-c2-rCX\" firstAttribute=\"centerY\" secondItem=\"iN0-l3-epB\" secondAttribute=\"bottom\" multiplier=\"1/3\" constant=\"1\" id=\"Kid-kn-2rF\"/>
+                <constraint firstAttribute=\"centerX\" secondItem=\"kId-c2-rCX\" secondAttribute=\"centerX\" id=\"Koa-jz-hwk\"/>
+                <constraint firstAttribute=\"bottom\" secondItem=\"8ie-xW-0ye\" secondAttribute=\"bottom\" constant=\"20\" id=\"Kzo-t9-V3l\"/>
+                <constraint firstItem=\"8ie-xW-0ye\" firstAttribute=\"leading\" secondItem=\"iN0-l3-epB\" secondAttribute=\"leading\" constant=\"20\" symbolic=\"YES\" id=\"MfP-vx-nX0\"/>
+                <constraint firstAttribute=\"centerX\" secondItem=\"8ie-xW-0ye\" secondAttribute=\"centerX\" id=\"ZEH-qu-HZ9\"/>
+                <constraint firstItem=\"kId-c2-rCX\" firstAttribute=\"leading\" secondItem=\"iN0-l3-epB\" secondAttribute=\"leading\" constant=\"20\" symbolic=\"YES\" id=\"fvb-Df-36g\"/>
+            </constraints>
+            <nil key=\"simulatedStatusBarMetrics\"/>
+            <freeformSimulatedSizeMetrics key=\"simulatedDestinationMetrics\"/>
+            <point key=\"canvasLocation\" x=\"404\" y=\"445\"/>
+        </view>
+    </objects>
+</document>

mkspecs/macx-ios-clang/features/default_post.prf

@@ -184,6 +184,14 @@ macx-xcode {
     QMAKE_SUBSTITUTES += copy_image
     launch_images.files = $$copy_image.output
     QMAKE_BUNDLE_DATA += launch_images
+
+    # Set up default LaunchScreen to support iPhone6/6+
+    launch_screen = LaunchScreen.xib
+    copy_launch_screen.input = $$QMAKESPEC/$$launch_screen
+    copy_launch_screen.output = $$OUT_PWD/$${TARGET}.xcodeproj/$$launch_screen
+    QMAKE_SUBSTITUTES += copy_launch_screen
+    launch_screens.files = $$copy_launch_screen.output
+    QMAKE_BUNDLE_DATA += launch_screens
 }
 
 macx-xcode {