Added @3x tiles support.

CedarMaps.podspec

@@ -9,7 +9,7 @@
 
 Pod::Spec.new do |s|
   s.name             = "CedarMaps"
-  s.version          = "0.1.3"
+  s.version          = "0.1.4"
   s.summary          = "Cedar Studio iOS SDK"
   s.description      = "Cedar Studio should write something to introduce their Pod."
   s.homepage         = "http://cedar.ir"

Pod/Classes/CSMapSource.m

@@ -81,9 +81,13 @@ static NSString * const kBaseURL = @"http://api.cedarmaps.com/v1";
     tileURLString = [tileURLString stringByReplacingOccurrencesOfString:@"{x}" withString:x.stringValue];
     tileURLString = [tileURLString stringByReplacingOccurrencesOfString:@"{y}" withString:y.stringValue];
 
-    if ([[UIScreen mainScreen] scale] > 1.0) {
+    CGFloat scale = [[UIScreen mainScreen] scale];
+    if (scale > 1.0) {
         tileURLString = [tileURLString stringByReplacingOccurrencesOfString:@".png" withString:@"@2x.png"];
     }
+    else if (scale > 2.0) {
+        tileURLString = [tileURLString stringByReplacingOccurrencesOfString:@".png" withString:@"@3x.png"];
+    }
 
     return [NSURL URLWithString:tileURLString];
 }