Update

subprojects/gst-docs/examples/tutorials/xcode iOS/Tutorial 2/ViewController.m

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+#import "ViewController.h"
+#import "GStreamerBackend.h"
+#import <UIKit/UIKit.h>
+
+@interface ViewController () {
+    GStreamerBackend *gst_backend;
+}
+
+@end
+
+@implementation ViewController
+
+/*
+ * Methods from UIViewController
+ */
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+
+    play_button.enabled = FALSE;
+    pause_button.enabled = FALSE;
+
+    gst_backend = [[GStreamerBackend alloc] init:self];
+}
+
+- (void)didReceiveMemoryWarning
+{
+    [super didReceiveMemoryWarning];
+    // Dispose of any resources that can be recreated.
+}
+
+/* Called when the Play button is pressed */
+-(IBAction) play:(id)sender
+{
+    [gst_backend play];
+}
+
+/* Called when the Pause button is pressed */
+-(IBAction) pause:(id)sender
+{
+    [gst_backend pause];
+}
+
+/*
+ * Methods from GstreamerBackendDelegate
+ */
+
+-(void) gstreamerInitialized
+{
+    dispatch_async(dispatch_get_main_queue(), ^{
+        play_button.enabled = TRUE;
+        pause_button.enabled = TRUE;
+        message_label.text = @"Ready";
+    });
+}
+
+-(void) gstreamerSetUIMessage:(NSString *)message
+{
+    dispatch_async(dispatch_get_main_queue(), ^{
+        message_label.text = message;
+    });
+}
+
+@end