cmd/ebitenmobile: Add suspendGame/resumeGame to the ViewController

Updates #894

cmd/ebitenmobile/gobind.go

@@ -122,6 +122,8 @@ const objcM = `// Code generated by ebitenmobile. DO NOT EDIT.
 
 @implementation {{.PrefixUpper}}EbitenViewController {
   GLKView* glkView_;
+  bool     started_;
+  bool     active_;
   bool     error_;
 }
 
@@ -136,6 +138,13 @@ const objcM = `// Code generated by ebitenmobile. DO NOT EDIT.
 - (void)viewDidLoad {
   [super viewDidLoad];
 
+  if (!started_) {
+    @synchronized(self) {
+      active_ = true;
+    }
+    started_ = true;
+  }
+
   self.glkView.delegate = (id<GLKViewDelegate>)(self);
   [self.view addSubview: self.glkView];
 
@@ -174,6 +183,13 @@ const objcM = `// Code generated by ebitenmobile. DO NOT EDIT.
   if (error_) {
     return;
   }
+
+  @synchronized(self) {
+    if (!active_) {
+      return;
+    }
+  }
+
   NSError* err = nil;
   EbitenmobileviewUpdate(&err);
   if (err != nil) {
@@ -214,6 +230,24 @@ const objcM = `// Code generated by ebitenmobile. DO NOT EDIT.
   [self updateTouches:touches];
 }
 
+- (void)suspendGame
+{
+  NSAssert(started_, @"suspendGame msut not be called before viewDidLoad is called");
+
+  @synchronized(self) {
+    active_ = false;
+  }
+}
+
+- (void)resumeGame
+{
+  NSAssert(started_, @"resumeGame msut not be called before viewDidLoad is called");
+
+  @synchronized(self) {
+    active_ = true;
+  }
+}
+
 @end
 `
 

cmd/ebitenmobile/main.go

@@ -214,7 +214,21 @@ const objcH = `// Code generated by ebitenmobile. DO NOT EDIT.
 #import <UIKit/UIKit.h>
 
 @interface {{.PrefixUpper}}EbitenViewController : UIViewController
+
+// onErrorOnGameUpdate is called on the main thread when an error happens when updating a game.
+// You can define your own error handler, e.g., using Crashlytics, by overwriting this method.
 - (void)onErrorOnGameUpdate:(NSError*)err;
+
+// suspendGame suspends the game.
+// It is recommended to call this when the application is being suspended e.g.,
+// UIApplicationDelegate's applicationWillResignActive is called.
+- (void)suspendGame;
+
+// resumeGame resumes the game.
+// It is recommended to call this when the application is being resumed e.g.,
+// UIApplicationDelegate's applicationDidBecomeActive is called.
+- (void)resumeGame;
+
 @end
 `