[ios] Fix for integration tests not running on iOS 9. (#12145)

platform/ios/Integration Tests/MGLCameraTransitionTests.mm

@@ -323,11 +323,7 @@
     // Should take MGLAnimationDuration
     [self.mapView setCenterCoordinate:target zoomLevel:zoomLevel animated:YES];
 
-    // Run the loop, so the camera can fly to the new camera
-    while (runloop) {
-        [[NSRunLoop mainRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
-    }
-    [self waitForExpectations:@[expectation] timeout:0.5];
+    [self waitForExpectations:@[expectation] timeout:2.0];
 
     NSLog(@"setCenterCoordinate: %0.4fs", stop1 - stop0);
     NSLog(@"flyToCamera: %0.4fs", stop2 - stop1);

platform/ios/Integration Tests/MGLMapViewIntegrationTest.m

@@ -1,5 +1,9 @@
 #import "MGLMapViewIntegrationTest.h"
 
+@interface MGLMapView (MGLMapViewIntegrationTest)
+- (void)updateFromDisplayLink;
+@end
+
 @implementation MGLMapViewIntegrationTest
 
 - (void)setUp {
@@ -78,6 +82,27 @@
     [self waitForExpectations:@[self.renderFinishedExpectation] timeout:timeout];
 }
 
+- (void)waitForExpectations:(NSArray<XCTestExpectation *> *)expectations timeout:(NSTimeInterval)seconds {
+
+    NSTimer *timer;
+
+    if (@available(iOS 10.0, *)) {
+        // We're good.
+    }
+    else if (self.mapView) {
+        // Before iOS 10 it seems that the display link is not called during the
+        // waitForExpectations below
+        timer = [NSTimer scheduledTimerWithTimeInterval:1.0/30.0
+                                                 target:self.mapView
+                                               selector:@selector(updateFromDisplayLink)
+                                               userInfo:nil
+                                                repeats:YES];
+    }
+
+    [super waitForExpectations:expectations timeout:seconds];
+    [timer invalidate];
+}
+
 - (MGLStyle *)style {
     return self.mapView.style;
 }