Animate nav bar title text change

Question

In my app, I have a page view controller that allows the user to swipe between different \"sections\" of the app, and at the top in the nav bar I change the title text to th

Answer 1

Found the best way is this category:

@implementation UIViewController (ControllerNavigationEffects)

-(void) setNavigationTitleWithAnimation:(NSString *) title {
    if ([self.navigationItem.title isEqualToString:title]) {
        return;
    }
    @weakify(self);
    float duration = 0.2;
    [UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
        @strongify(self);
        self.navigationItem.titleView.alpha = 0;
    } completion:^(BOOL finished) {}];

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(duration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        @strongify(self);
        self.navigationItem.titleView = nil;
        self.navigationItem.title = title;

        [UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
            self.navigationItem.titleView.alpha = 1;
        } completion:nil];
    });
}

-(void) setNavigationTitleViewWithAnimation:(UIView *) titleView {
    if ([self.navigationItem.titleView isKindOfClass:[titleView class]]) {
        return;
    }
    @weakify(self);
    float duration = 0.2;

    CATransition *fadeTextAnimation = [CATransition animation];
    fadeTextAnimation.duration = duration;
    fadeTextAnimation.type = kCATransitionFade;

    [self.navigationController.navigationBar.layer addAnimation: fadeTextAnimation forKey: @"fadeText"];
    self.navigationItem.title = @"";


    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(duration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        @strongify(self);
        self.navigationItem.title = @"";
        self.navigationItem.titleView = titleView;

        [UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
            self.navigationItem.titleView.alpha = 1;
        } completion:nil];

    });
}