fix canOpenURL studyplus

Author: masashi-sutou

Demo/Info.plist

@@ -2,6 +2,10 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>LSApplicationQueriesSchemes</key>
+	<array>
+		<string>studyplus</string>
+	</array>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>en</string>
 	<key>CFBundleExecutable</key>

StudyplusSDK/Studyplus.swift

@@ -299,20 +299,20 @@ final public class Studyplus {
 
     private func openStudyplus(command: String) {
 
-        let urlString: String = "studyplus://external_app/" + command + "/" + consumerKey + "/" + consumerSecret
-
-        if let url = URL(string: urlString) {
-        
-            applicationOpen(url)
-
-        } else {
-            
+        guard UIApplication.shared.canOpenURL(URL(string: "studyplus://")!) else {
             if self.openAppStoreIfNotInstalled {
-            
                 let appStoreURLString: String = "https://apps.apple.com/jp/app/id505410049?mt=8"
                 guard let appStoreURL = URL(string: appStoreURLString) else { return }
                 applicationOpen(appStoreURL)
             }
+            return
+        }
+        
+        let urlString: String = "studyplus://external_app/" + command + "/" + consumerKey + "/" + consumerSecret
+
+        if let url = URL(string: urlString) {
+        
+            applicationOpen(url)
         }
     }