playback: fix fatal runtime exception on iOS 6

The sleep timer requires iOS 7 or later

Sources/VLCMovieViewController.m

@@ -245,6 +245,8 @@ typedef NS_ENUM(NSInteger, VLCPanType) {
     _sleepTimerButton.accessibilityLabel = NSLocalizedString(@"BUTTON_SLEEP_TIMER", nil);
     _sleepTimerButton.isAccessibilityElement = YES;
     [_sleepTimerButton setTitle:NSLocalizedString(@"BUTTON_SLEEP_TIMER", nil) forState:UIControlStateNormal];
+    if (!SYSTEM_RUNS_IOS7_OR_LATER)
+        _sleepTimerButton.hidden = YES;
 
     _multiSelectionView = [[VLCMultiSelectionMenuView alloc] init];
     _multiSelectionView.delegate = self;
@@ -442,45 +444,47 @@ typedef NS_ENUM(NSInteger, VLCPanType) {
     _equalizerView.hidden = YES;
     [self.view addSubview:_equalizerView];
 
-    /* add sleep timer UI */
-    _sleepTimerContainer = [[VLCFrostedGlasView alloc] initWithFrame:CGRectMake(0., 0., 300., 162.)];
-    _sleepTimerContainer.center = self.view.center;
-    _sleepTimerContainer.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin;
-
-    _sleepTimeDatePicker = [[UIDatePicker alloc] init];
-    if ([[UIDevice currentDevice] speedCategory] >= 3) {
-        _sleepTimeDatePicker.opaque = NO;
-        _sleepTimeDatePicker.backgroundColor = [UIColor clearColor];
-    } else
-        _sleepTimeDatePicker.backgroundColor = [UIColor blackColor];
-    _sleepTimeDatePicker.tintColor = [UIColor VLCLightTextColor];
-    _sleepTimeDatePicker.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin;
-    [_sleepTimerContainer addSubview:_sleepTimeDatePicker];
-
-    /* adapt the date picker style to suit our needs */
-    [_sleepTimeDatePicker setValue:[UIColor whiteColor] forKeyPath:@"textColor"];
-    SEL selector = NSSelectorFromString(@"setHighlightsToday:");
-    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDatePicker instanceMethodSignatureForSelector:selector]];
-    BOOL no = NO;
-    [invocation setSelector:selector];
-    [invocation setArgument:&no atIndex:2];
-    [invocation invokeWithTarget:_sleepTimeDatePicker];
-
-    if (_sleepTimerContainer.subviews.count > 0) {
-        NSArray *subviewsOfSubview = [_sleepTimeDatePicker.subviews[0] subviews];
-        NSUInteger subviewCount = subviewsOfSubview.count;
-        for (NSUInteger x = 0; x < subviewCount; x++) {
-            if ([subviewsOfSubview[x] isKindOfClass:[UILabel class]])
-                [subviewsOfSubview[x] setTextColor:[UIColor VLCLightTextColor]];
+    /* add sleep timer UI, requires iOS 7 or later */
+    if (SYSTEM_RUNS_IOS7_OR_LATER) {
+        _sleepTimerContainer = [[VLCFrostedGlasView alloc] initWithFrame:CGRectMake(0., 0., 300., 162.)];
+        _sleepTimerContainer.center = self.view.center;
+        _sleepTimerContainer.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin;
+
+        _sleepTimeDatePicker = [[UIDatePicker alloc] init];
+        if ([[UIDevice currentDevice] speedCategory] >= 3) {
+            _sleepTimeDatePicker.opaque = NO;
+            _sleepTimeDatePicker.backgroundColor = [UIColor clearColor];
+        } else
+            _sleepTimeDatePicker.backgroundColor = [UIColor blackColor];
+        _sleepTimeDatePicker.tintColor = [UIColor VLCLightTextColor];
+        _sleepTimeDatePicker.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin;
+        [_sleepTimerContainer addSubview:_sleepTimeDatePicker];
+
+        /* adapt the date picker style to suit our needs */
+        [_sleepTimeDatePicker setValue:[UIColor whiteColor] forKeyPath:@"textColor"];
+        SEL selector = NSSelectorFromString(@"setHighlightsToday:");
+        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDatePicker instanceMethodSignatureForSelector:selector]];
+        BOOL no = NO;
+        [invocation setSelector:selector];
+        [invocation setArgument:&no atIndex:2];
+        [invocation invokeWithTarget:_sleepTimeDatePicker];
+
+        if (_sleepTimerContainer.subviews.count > 0) {
+            NSArray *subviewsOfSubview = [_sleepTimeDatePicker.subviews[0] subviews];
+            NSUInteger subviewCount = subviewsOfSubview.count;
+            for (NSUInteger x = 0; x < subviewCount; x++) {
+                if ([subviewsOfSubview[x] isKindOfClass:[UILabel class]])
+                    [subviewsOfSubview[x] setTextColor:[UIColor VLCLightTextColor]];
+            }
         }
-    }
-    _sleepTimeDatePicker.datePickerMode = UIDatePickerModeCountDownTimer;
-    _sleepTimeDatePicker.minuteInterval = 5;
-    _sleepTimeDatePicker.minimumDate = [NSDate date];
-    _sleepTimeDatePicker.countDownDuration = 1200.;
-    [_sleepTimeDatePicker addTarget:self action:@selector(sleepTimerAction:) forControlEvents:UIControlEventValueChanged];
+        _sleepTimeDatePicker.datePickerMode = UIDatePickerModeCountDownTimer;
+        _sleepTimeDatePicker.minuteInterval = 5;
+        _sleepTimeDatePicker.minimumDate = [NSDate date];
+        _sleepTimeDatePicker.countDownDuration = 1200.;
+        [_sleepTimeDatePicker addTarget:self action:@selector(sleepTimerAction:) forControlEvents:UIControlEventValueChanged];
 
-    [self.view addSubview:_sleepTimerContainer];
+        [self.view addSubview:_sleepTimerContainer];
+    }
 }
 
 - (BOOL)_blobCheck