iOS unwanted delay when calling transitionWithView:

Question

I'm getting a really long (about 6 seconds) delay between when I call transitionWithViewand when the animation actually starts on the screen. Is it because I am calling transitionWithView from a handler or something?

- (IBAction)saveToCal:(id)sender{
    LBWrapperView *wrapper = (LBWrapperView*)self.parentViewController;
    EKEventStore *store = [EKEventStore new];
    [store requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) {
        if (!granted) { return; }
        EKEvent *event = [EKEvent eventWithEventStore:store];
        event.title = wrapper.lunch.title;
        ...
        event.calendar = [store defaultCalendarForNewEvents];
        NSError *err = nil;
        [store saveEvent:event span:EKSpanThisEvent commit:YES error:&err];
        if (!err){
            [UIView transitionWithView:self.addToCalendarBtn duration:1.0 options:UIViewAnimationOptionCurveLinear animations:^{
                self.addToCalendarBtn.alpha = 0.0;
            } completion:nil];

        }
    }];
}

Edit: I also have the same problem when calling:

[UIView animateWithDuration:1.0 animations:^{
    self.addToCalendarBtn.alpha = 0.0;
}];

I think you're response is here: http://stackoverflow.com/a/13886839/1514637 — Mehdi Hosseinzadeh, Oct 03 '15 at 15:58
I think that's for two conflicting animations. I'm only doing one animation. I did try to change the `transitionWithView` view to self.addToCalendarBtn but it didn't change anything. I also tried to call `animateWithDuration` which didn't solve the problem either. — Chase Roberts, Oct 03 '15 at 16:20

Mehdi Hosseinzadeh · Accepted Answer · 2015-10-03T16:28:24.317

Are you sure you're running under main thread? Using other threads also make User interface manipulation laggy.

You can use below code to changing you're UI manipulation to main thread:

dispatch_async(dispatch_get_main_queue(), ^{
    [UIView transitionWithView:self.addToCalendarBtn duration:1.0 options:UIViewAnimationOptionCurveLinear animations:^{
            self.addToCalendarBtn.alpha = 0.0;
     } completion:nil];
});

iOS unwanted delay when calling transitionWithView:

1 Answers1