ATV cloud services: add login checker for Dropbox

VLC for Apple TV/VLCCloudServicesTVViewController.h

@@ -13,4 +13,6 @@
 
 @interface VLCCloudServicesTVViewController : UIViewController
 
+- (IBAction)dropbox:(id)sender;
+
 @end

VLC for Apple TV/VLCCloudServicesTVViewController.m

@@ -10,6 +10,8 @@
  *****************************************************************************/
 
 #import "VLCCloudServicesTVViewController.h"
+#import <DropboxTVSDK/DropboxSDK.h>
+#import "VLCDropboxController.h"
 
 @interface VLCCloudServicesTVViewController ()
 
@@ -27,4 +29,27 @@
     return @"Cloud Services";
 }
 
+- (void)dropbox:(id)sender
+{
+    if (![[VLCDropboxController sharedInstance] isAuthorized]) {
+        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Login failure"
+                                                                       message:@"To use Dropbox, you need to login to iCloud with the same ID to both this Apple TV and an iOS device.\nAfterwards, login to Dropbox using the VLC app on your iOS device and try again."
+                                                                preferredStyle:UIAlertControllerStyleAlert];
+
+        UIAlertAction *defaultAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"BUTTON_OK", nil)
+                                                                style:UIAlertActionStyleDestructive
+                                                              handler:^(UIAlertAction * action) {
+                                                              }];
+
+        UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"BUTTON_RETRY", nil)
+                                                               style:UIAlertActionStyleDefault
+                                                             handler:^(UIAlertAction * action) {
+                                                                 [self dropbox:nil];
+                                                             }];
+        [alert addAction:defaultAction];
+        [alert addAction:cancelAction];
+        [self presentViewController:alert animated:YES completion:nil];
+    }
+}
+
 @end

VLC for Apple TV/VLCCloudServicesTVViewController.xib

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder.AppleTV.XIB" version="3.0" toolsVersion="9058" systemVersion="14F1017" targetRuntime="AppleTV" propertyAccessControl="none" useAutolayout="YES">
+<document type="com.apple.InterfaceBuilder.AppleTV.XIB" version="3.0" toolsVersion="9058" systemVersion="15A284" targetRuntime="AppleTV" propertyAccessControl="none" useAutolayout="YES">
     <dependencies>
         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="9048"/>
     </dependencies>
@@ -16,27 +16,35 @@
             <subviews>
                 <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Cloud Services" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="B3D-nr-ofx">
                     <rect key="frame" x="714" y="26" width="493" height="91"/>
+                    <animations/>
                     <fontDescription key="fontDescription" style="UICTFontTextStyleTitle1"/>
                     <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                     <nil key="highlightedColor"/>
                 </label>
                 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="hdP-Dp-Mn0">
                     <rect key="frame" x="810" y="329" width="301" height="86"/>
+                    <animations/>
                     <inset key="contentEdgeInsets" minX="40" minY="20" maxX="40" maxY="20"/>
                     <state key="normal" title="Dropbox"/>
+                    <connections>
+                        <action selector="dropbox:" destination="-1" eventType="primaryActionTriggered" id="CbH-po-vKw"/>
+                    </connections>
                 </button>
                 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="uaI-5Z-SJq">
                     <rect key="frame" x="810" y="445" width="301" height="86"/>
+                    <animations/>
                     <inset key="contentEdgeInsets" minX="40" minY="20" maxX="40" maxY="20"/>
                     <state key="normal" title="Google Drive"/>
                 </button>
                 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="HPy-k8-PTt">
                     <rect key="frame" x="810" y="561" width="301" height="86"/>
+                    <animations/>
                     <inset key="contentEdgeInsets" minX="40" minY="20" maxX="40" maxY="20"/>
                     <state key="normal" title="Box"/>
                 </button>
                 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="gFm-4V-QFs">
                     <rect key="frame" x="810" y="677" width="301" height="86"/>
+                    <animations/>
                     <inset key="contentEdgeInsets" minX="40" minY="20" maxX="40" maxY="20"/>
                     <state key="normal" title="OneDrive"/>
                 </button>