Update

subprojects/gst-docs/examples/tutorials/xcode iOS/Tutorial 3/ViewController.m

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+#import "ViewController.h"
+#import "GStreamerBackend.h"
+#import <UIKit/UIKit.h>
+
+@interface ViewController () {
+    GStreamerBackend *gst_backend;
+    int media_width;
+    int media_height;
+}
+
+@end
+
+@implementation ViewController
+
+/*
+ * Methods from UIViewController
+ */
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+
+    play_button.enabled = FALSE;
+    pause_button.enabled = FALSE;
+
+    /* Make these constant for now, later tutorials will change them */
+    media_width = 320;
+    media_height = 240;
+
+    gst_backend = [[GStreamerBackend alloc] init:self videoView:video_view];
+}
+
+- (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];
+}
+
+- (void)viewDidLayoutSubviews
+{
+    CGFloat view_width = video_container_view.bounds.size.width;
+    CGFloat view_height = video_container_view.bounds.size.height;
+
+    CGFloat correct_height = view_width * media_height / media_width;
+    CGFloat correct_width = view_height * media_width / media_height;
+
+    if (correct_height < view_height) {
+        video_height_constraint.constant = correct_height;
+        video_width_constraint.constant = view_width;
+    } else {
+        video_width_constraint.constant = correct_width;
+        video_height_constraint.constant = view_height;
+    }
+}
+
+/*
+ * 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