Suppose you show a HUD during a network request, but that request com…

…pletes very quickly. Without this feature, the HUD appears and then quickly disappears, flashing too quickly on the screen. Prevent quick flashes by allowing specification of a “minimumDisplayTime”.

JGProgressHUD/JGProgressHUD/JGProgressHUD.h

@@ -251,6 +251,13 @@ typedef NS_ENUM(NSUInteger, JGProgressHUDInteractionType) {
 - (void)setProgress:(float)progress animated:(BOOL)animated;
 
 
+/**
+ Specify a minimum time that the HUD will be on-screen. Useful to prevent the HUD from flashing quickly on the screen when network operations complete more quickly than expected.
+ 
+ @b Default: 0.0.
+ */
+@property (nonatomic, assign) NSTimeInterval minimumDisplayTime;
+
 /////////////
 // Showing //
 /////////////

JGProgressHUD/JGProgressHUD/JGProgressHUD.m

@@ -42,6 +42,8 @@ @interface JGProgressHUD () {
     BOOL _dismissAfterTransitionFinished;
     BOOL _dismissAfterTransitionFinishedWithAnimation;
 
+    CFAbsoluteTime _displayTime;
+
     JGProgressHUDIndicatorView *_indicatorViewAfterTransitioning;
 }
 
@@ -328,6 +330,7 @@ - (void)cleanUpAfterPresentation {
     self.hidden = NO;
 
     _transitioning = NO;
+    _displayTime = CFAbsoluteTimeGetCurrent();
 
     if (_indicatorViewAfterTransitioning) {
         self.indicatorView = _indicatorViewAfterTransitioning;
@@ -389,6 +392,8 @@ - (void)showInRect:(CGRect)rect inView:(UIView *)view animated:(BOOL)animated {
 
     _transitioning = YES;
 
+    _displayTime = 0;
+
     if ([self.delegate respondsToSelector:@selector(progressHUD:willPresentInView:)]) {
         [self.delegate progressHUD:self willPresentInView:view];
     }
@@ -435,6 +440,15 @@ - (void)dismissAnimated:(BOOL)animated {
         return;
     }
 
+    if (self.minimumDisplayTime > 0 && _displayTime > 0) {
+        CFAbsoluteTime displayedTime = CFAbsoluteTimeGetCurrent() - _displayTime;
+        if (displayedTime < self.minimumDisplayTime) {
+            NSTimeInterval delay = self.minimumDisplayTime - displayedTime;
+            [self dismissAfterDelay:delay animated:animated];
+            return;
+        }
+    }
+
     _transitioning = YES;
 
     if ([self.delegate respondsToSelector:@selector(progressHUD:willDismissFromView:)]) {