ios - Animations not working properly -


i present view controller modally in application. i'd user able "flick" view away gesture. wrote code below that:

- (void)handlepan:(uipangesturerecognizer *)recognizer {     cgfloat elasticthreshold = 100;     cgfloat dismissthreshold = 200;     cgpoint translation = [recognizer translationinview:self.view];     cgfloat newy = 0;     cgfloat translationfactor = 0.5;      if (recognizer.state == uigesturerecognizerstateended) {         if (translation.y < dismissthreshold) {             newy = 0;         }     } else {         if (translation.y > elasticthreshold) {             cgfloat frictionlength = translation.y - elasticthreshold;             cgfloat frictiontranslation = 30 * atan(frictionlength/120) + frictionlength/10;             newy = frictiontranslation + (elasticthreshold * translationfactor);         } else {             newy = translation.y*translationfactor;         }     }      if (translation.y > dismissthreshold) {         [uiview animatekeyframeswithduration:0.5 delay:0.0 options:0 animations:^{             [uiview addkeyframewithrelativestarttime:0.0 relativeduration:0.5 animations:^{                 self.overlay.effect = nil;                 self.collectionview.transform = cgaffinetransformmaketranslation(0, self.view.frame.size.height);             }];             [uiview addkeyframewithrelativestarttime:0.1 relativeduration:0.1 animations:^{                 self.pagecontrol.frame = cgrectmake((self.view.frame.size.width-200)/2, self.view.frame.size.height, 200, 20);             }];         } completion:^(bool finished) {             if (finished) {                 [self dismissviewcontrolleranimated:yes completion:nil];             }         }];     } else {         self.collectionview.transform = cgaffinetransformmaketranslation(0, newy);         self.pagecontrol.transform = cgaffinetransformmaketranslation(0, (newy+self.collectionview.frame.size.height)-20);     } }

this hooked uigesturerecognizer:

self.pan = [[uipangesturerecognizer alloc] initwithtarget:self action:@selector(handlepan:)]; self.pan.delegate = self; self.pan.maximumnumberoftouches = 1; [self.view addgesturerecognizer:self.pan];

however, happens completion block executes immediately. you'll see view move down (because of dismissviewcontrolleranimated) , @ same time see overlay.effect go away. however, animations happen , view controller dismiss silently.

any ideas what's going wrong here?

this occurs because nesting uiview animation blocks. should use dispatch_after this:

double delayinseconds = 0.5; dispatch_time_t poptime = dispatch_time(dispatch_time_now, delayinseconds * nsec_per_sec); dispatch_after(poptime, dispatch_get_main_queue(), ^(void){     [self dismissviewcontrolleranimated:yes completion:nil]; });

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