Fix iOS7 crash (#280)

src/ios/APPLocalNotification.m

@@ -20,6 +20,7 @@
  */
 
 #import "APPLocalNotification.h"
+#import <Cordova/CDVAvailability.h>
 
 @interface APPLocalNotification (Private)
 
@@ -238,11 +239,13 @@
  */
 - (void) promptForPermission:(CDVInvokedUrlCommand *)command
 {
-    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
-        UIUserNotificationType types =
-        UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound;
+    if (IsAtLeastiOSVersion(@"8.0")) {
+        UIUserNotificationType types;
+        UIUserNotificationSettings *settings;
 
-        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:types
+        types = UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound;
+
+        settings = [UIUserNotificationSettings settingsForTypes:types
                                                      categories:nil];
 
         [self.commandDelegate runInBackground:^{
@@ -257,14 +260,16 @@
  */
 - (BOOL) hasPermissionToSheduleNotifications
 {
-    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
-        UIUserNotificationSettings *settings = [[UIApplication sharedApplication]
+    if (IsAtLeastiOSVersion(@"8.0")) {
+        UIUserNotificationType types;
+        UIUserNotificationSettings *settings;
+
+        settings = [[UIApplication sharedApplication]
                     currentUserNotificationSettings];
 
-        UIUserNotificationType requiredTypes =
-        UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound;
+        types = UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound;
 
-        return (settings.types & requiredTypes);
+        return (settings.types & types);
     } else {
         return YES;
     }