[ios] Refined custom callout view support

Renamed MGLCalloutView to MGLCompactCalloutView and MGLCalloutViewProtocol to MGLCalloutView to avoid an awkward workaround for a Swift name collision. Replaced individual title and subtitle properties with a single representedObject property that lets you use custom annotation properties in the custom callout view. Overrode a problematic SMCalloutView method. Added lots more documentation.

1 files changed, 31 insertions, 0 deletions

diff --git a/platform/ios/src/MGLCompactCalloutView.m b/platform/ios/src/MGLCompactCalloutView.m
new file mode 100644
index 0000000000..49812c51a4
--- /dev/null
+++ b/platform/ios/src/MGLCompactCalloutView.m
@@ -0,0 +1,31 @@
+#import "MGLCompactCalloutView.h"
+
+#import "MGLAnnotation.h"
+
+@implementation MGLCompactCalloutView
+{
+    id <MGLAnnotation> _representedObject;
+}
+
+@synthesize representedObject = _representedObject;
+
++ (instancetype)platformCalloutView
+{
+    return [[self alloc] init];
+}
+
+- (void)setRepresentedObject:(id <MGLAnnotation>)representedObject
+{
+    _representedObject = representedObject;
+    
+    if ([representedObject respondsToSelector:@selector(title)])
+    {
+        self.title = representedObject.title;
+    }
+    if ([representedObject respondsToSelector:@selector(subtitle)])
+    {
+        self.subtitle = representedObject.subtitle;
+    }
+}
+
+@end