add update interval

GDPerformanceView.podspec

@@ -1,13 +1,13 @@
 Pod::Spec.new do |s|
   s.name         = "GDPerformanceView"
-  s.version      = "1.3.1"
+  s.version      = "1.3.2"
   s.summary      = "Shows FPS, CPU usage, app and iOS versions above the status bar and report FPS and CPU usage via delegate."
   s.homepage     = "https://github.com/dani-gavrilov/GDPerformanceView"
   s.license      = { :type => "MIT", :file => "LICENSE" }
   s.author       = { "Gavrilov Daniil" => "daniilmbox@gmail.com" }
   s.platform     = :ios, "8.0"
   s.ios.deployment_target = "8.0"
-  s.source       = { :git => "https://github.com/dani-gavrilov/GDPerformanceView.git", :tag => "1.3.1" }
+  s.source       = { :git => "https://github.com/dani-gavrilov/GDPerformanceView.git", :tag => "1.3.2" }
   s.source_files = "GDPerformanceView/GDPerformanceMonitoring/*"
   s.frameworks = "UIKit", "Foundation", "QuartzCore"  
   s.requires_arc = true

GDPerformanceView/GDPerformanceMonitoring/GDPerformanceMonitor.h

@@ -43,6 +43,11 @@
  */
 @property (nonatomic, getter=isDeviceVersionHidden) BOOL deviceVersionHidden;
 
+/**
+ Change it to update the time interval between each report. Default is 1 sec.
+ Minimum value is 0.5 sec.
+ */
+@property (nonatomic) NSTimeInterval updateTimeInterval;
 
 /**
  Creates and returns instance of GDPerformanceMonitor, as singleton.

GDPerformanceView/GDPerformanceMonitoring/GDPerformanceMonitor.m

@@ -57,6 +57,7 @@ + (instancetype)sharedInstance {
 - (instancetype)init {
     self = [super init];
     if (self) {
+        self.updateTimeInterval = 1.0f;
         [self subscribeToNotifications];
     }
     return self;
@@ -175,6 +176,7 @@ - (void)setupPerformanceView {
     [self.performanceView setAppVersionHidden:self.appVersionHidden];
     [self.performanceView setDeviceVersionHidden:self.deviceVersionHidden];
     [self.performanceView setPerformanceDelegate:self.delegate];
+    [self.performanceView setUpdateTimeInterval:self.updateTimeInterval];
     [self checkAndApplyStatusBarAppearanceWithPrefersStatusBarHidden:self.prefersStatusBarHidden preferredStatusBarStyle:self.preferredStatusBarStyle];
 
     if (self.isPerformanceViewPaused) {
@@ -225,4 +227,11 @@ - (void)setDeviceVersionHidden:(BOOL)deviceVersionHidden {
     }
 }
 
+- (void)setUpdateTimeInterval:(NSTimeInterval)updateTimeInterval {
+    _updateTimeInterval = updateTimeInterval;
+
+    if (self.performanceView) {
+        [self.performanceView setUpdateTimeInterval:updateTimeInterval];
+    }
+}
 @end

GDPerformanceView/GDPerformanceMonitoring/GDPerformanceView.h

@@ -41,6 +41,12 @@
  */
 @property (nonatomic, getter=isDeviceVersionHidden) BOOL deviceVersionHidden;
 
+/**
+ Change it to update the time interval between each report. Default is 1 sec.
+ Minimum value is 0.5 sec.
+ */
+@property (nonatomic) NSTimeInterval updateTimeInterval;
+
 /**
  Override this properties to return the desired status bar attributes.
 

GDPerformanceView/GDPerformanceMonitoring/GDPerformanceView.m

@@ -149,6 +149,7 @@ - (void)setupWindowAndDefaultVariables {
     self.screenUpdatesCount = 0;
     self.screenUpdatesBeginTime = 0.0f;
     self.averageScreenUpdatesTime = 0.017f;
+    self.updateTimeInterval = 1.0f;
 
     GDWindowViewController *rootViewController = [[GDWindowViewController alloc] init];
 
@@ -193,22 +194,14 @@ - (void)displayLinkAction:(CADisplayLink *)displayLink {
 
         CFTimeInterval screenUpdatesTime = self.displayLink.timestamp - self.screenUpdatesBeginTime;
 
-        if (screenUpdatesTime >= 1.0) {
-            CFTimeInterval updatesOverSecond = screenUpdatesTime - 1.0f;
-            int framesOverSecond = updatesOverSecond / self.averageScreenUpdatesTime;
-
-            self.screenUpdatesCount -= framesOverSecond;
-            if (self.screenUpdatesCount < 0) {
-                self.screenUpdatesCount = 0;
-            }
-
+        if (screenUpdatesTime >= self.updateTimeInterval) {
             [self takeReadings];
         }
     }
 }
 
 - (void)takeReadings {
-    int fps = self.screenUpdatesCount;
+    int fps = self.screenUpdatesCount / (self.displayLink.timestamp - self.screenUpdatesBeginTime);
     float cpu = [self cpuUsage];
 
     self.screenUpdatesCount = 0;