UPDATE - fixed issue when apps transition to background (inactive) an…

…d foreground (active)

iCadeTest/iCade/iCadeReaderView.h

@@ -61,5 +61,6 @@
 
 @property (nonatomic, assign) iCadeState iCadeState;
 @property (nonatomic, assign) id<iCadeEventDelegate> delegate;
+@property (nonatomic, assign) BOOL active;
 
 @end

iCadeTest/iCade/iCadeReaderView.m

@@ -25,21 +25,58 @@ of this software and associated documentation files (the "Software"), to deal
 static const char *ON_STATES  = "wdxayhujikol";
 static const char *OFF_STATES = "eczqtrfnmpgv";
 
+@interface iCadeReaderView()
+
+- (void)didEnterBackground;
+- (void)didBecomeActive;
+
+@end
+
 @implementation iCadeReaderView
 
-@synthesize iCadeState=_iCadeState, delegate=_delegate;
+@synthesize iCadeState=_iCadeState, delegate=_delegate, active;
 
 - (id)initWithFrame:(CGRect)frame {
     self = [super initWithFrame:frame];
     inputView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1, 1)];
 
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didEnterBackground) name:UIApplicationDidEnterBackgroundNotification object:nil];
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didBecomeActive) name:UIApplicationDidBecomeActiveNotification object:nil];
+
     return self;
 }
 
+- (void)dealloc {
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidEnterBackgroundNotification object:nil];
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidBecomeActiveNotification object:nil];
+    [super dealloc];
+}
+
+- (void)didEnterBackground {
+    if (self.active)
+        [self resignFirstResponder];
+}
+
+- (void)didBecomeActive {
+    if (self.active)
+        [self becomeFirstResponder];
+}
+
 - (BOOL)canBecomeFirstResponder { 
     return YES; 
 }
 
+- (void)setActive:(BOOL)value {
+    if (active == value) return;
+
+    active = value;
+    if (active) {
+        [self becomeFirstResponder];
+    } else {
+        [self resignFirstResponder];
+    }
+}
+
 - (UIView*) inputView {
     return inputView;
 }

iCadeTest/iCadeTestViewController.m

@@ -64,7 +64,7 @@ - (void)viewDidLoad
     [super viewDidLoad];
     iCadeReaderView *control = [[iCadeReaderView alloc] initWithFrame:CGRectZero];
     [self.view addSubview:control];
-    [control becomeFirstResponder];
+    control.active = YES;
     control.delegate = self;
     [control release];    
     _stickCenter = stick.center;