UIProgressView Always Animates

code.m

UIProgressView *v = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
v.frame = CGRectMake(40, 100, 240, 2);
[self.view addSubview:v];

{
    double delayInSeconds = 1.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        [v setProgress:0.5f animated:NO];
    });
}

{
    double delayInSeconds = 2.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        [v setProgress:0.75f animated:NO];
    });
}

{
    double delayInSeconds = 3.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        [v setProgress:1.0f animated:NO];
    });
}

progressview.gif

Why does UIProgressView's setProgress:Animated: method always animate the change?

Not sure why, but I have had similar issues with other controls in iOS 7. As a workaround, I found that disabling animations altogether when updating the value and laying out the views takes care of it:

[UIView performWithoutAnimation:^{
    [v setProgress:1.0f animated:NO];
    [v layoutIfNeeded];
}];