[dev app] Add custom events examples

* Add button at the bottom of Dev App called "Track Custom Events"
* Add example custom events in Objective-C and Swift

Author: nan-li

iOS_SDK/OneSignalDevApp/OneSignalDevApp/Base.lproj/Main.storyboard

@@ -501,8 +501,8 @@
                                                 <fontDescription key="fontDescription" type="system" pointSize="14"/>
                                                 <textInputTraits key="textInputTraits"/>
                                             </textField>
-                                            <button opaque="NO" contentMode="scaleToFill" selected="YES" contentHorizontalAlignment="left" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="xRQ-ep-yvV" userLabel="Clear All Button">
-                                                <rect key="frame" x="140" y="1762" width="148" height="30"/>
+                                            <button opaque="NO" contentMode="scaleToFill" misplaced="YES" selected="YES" contentHorizontalAlignment="left" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="xRQ-ep-yvV" userLabel="Clear All Button">
+                                                <rect key="frame" x="115" y="1763" width="148" height="30"/>
                                                 <color key="tintColor" red="1" green="0.1367101157" blue="0.01701983743" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                 <state key="normal" title="Clear All Notifications"/>
                                                 <connections>
@@ -528,6 +528,15 @@
                                                     <action selector="requireConsent:" destination="BYZ-38-t0r" eventType="touchUpInside" id="vxn-ST-TBu"/>
                                                 </connections>
                                             </button>
+                                            <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" selected="YES" contentHorizontalAlignment="left" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Aea-nN-qtb" userLabel="Custom Events Button">
+                                                <rect key="frame" x="114" y="1808" width="145" height="30"/>
+                                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                                <color key="tintColor" red="1" green="0.1367101157" blue="0.01701983743" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                                                <state key="normal" title="Track Custom Events"/>
+                                                <connections>
+                                                    <action selector="trackCustomEvents:" destination="BYZ-38-t0r" eventType="touchUpInside" id="4Fa-IJ-LJT"/>
+                                                </connections>
+                                            </button>
                                         </subviews>
                                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                         <constraints>
@@ -760,7 +769,7 @@
             <color white="0.0" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
         </systemColor>
         <systemColor name="systemGreenColor">
-            <color red="0.20392156859999999" green="0.78039215689999997" blue="0.34901960780000002" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+            <color red="0.20392156862745098" green="0.7803921568627451" blue="0.34901960784313724" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
         </systemColor>
     </resources>
 </document>

iOS_SDK/OneSignalDevApp/OneSignalDevApp/SwiftTest.swift

@@ -28,9 +28,49 @@
 import Foundation
 import OneSignalFramework
 
+@objc
 class SwiftTest: NSObject {
     func testSwiftUserModel() {
         let token1 = OneSignal.User.pushSubscription.token
         let token = OneSignal.User.pushSubscription.token
     }
+
+    /**
+     Track multiple events with different properties.
+     Properties must pass `JSONSerialization.isValidJSONObject` to be accepted.
+     */
+    @objc
+    static func trackCustomEvents() {
+        print("Dev App: track an event with nil properties")
+        OneSignal.User.trackEvent(name: "null properties", properties: nil)
+
+        print("Dev App: track an event with empty properties")
+        OneSignal.User.trackEvent(name: "empty properties", properties: [:])
+
+        let formatter = DateFormatter()
+        formatter.dateStyle = .short
+
+        let mixedTypes = [
+            "string": "somestring",
+            "number": 5,
+            "bool": false,
+            "dateStr": formatter.string(from: Date())
+        ] as [String: Any]
+
+        let nestedDict = [
+            "someDict": mixedTypes,
+            "anotherDict": [
+                "foo": "bar",
+                "booleanVal": true,
+                "float": Float("3.14")!
+            ]
+        ]
+        let invalidProperties = ["date": Date()]
+
+        print("Dev App: track an event with a valid nested dictionary")
+        OneSignal.User.trackEvent(name: "nested dictionary", properties: nestedDict)
+
+        print("Dev App: track an event with invalid dictionary types")
+        OneSignal.User.trackEvent(name: "invalid dictionary", properties: invalidProperties)
+    }
 }

iOS_SDK/OneSignalDevApp/OneSignalDevApp/ViewController.m

@@ -277,4 +277,15 @@ - (IBAction)dontRequireConsent:(id)sender {
     [OneSignal setConsentRequired:false];
 }
 
+- (IBAction)trackCustomEvents:(id)sender {    
+    NSLog(@"Dev App: adding custom events");
+    [OneSignal.User trackEventWithName:@"simple event" properties:@{@"foobarbaz": @"foobarbaz"}];
+    NSMutableDictionary *dict = [NSMutableDictionary new];
+    dict[@"dict"] = @{@"abc" : @"def"};
+    dict[@"false"] = false;
+    dict[@"int"] = @99;
+    [OneSignal.User trackEventWithName:@"complex event" properties:dict];
+    [SwiftTest trackCustomEvents];
+}
+
 @end