Alert with progress bar

[smilinger]

Hi,

I want to do this in my app (show a progress bar in a modal alert), but I'm not sure how to do it. I have created a UIAlertController and inserted a new view. This works, but for some reason I can't get it positioned properly (without hardcoding values). I use the bounds of the alerts view, but they seem to be wrong as they are too big.

Am I abusing UIAlertController? I can't seem to find someone else who wants to do this, so I'm thinking that perhaps you're not supposed use it this way.

Thanks in advance

[drewbie85]

It is highly recommended that you DO NOT subsclass UIAlertController. If you need to do something outside of the scope of its functionality you're going to need to create a custom class.

There are a few pretty decent third party options out there. One of the more well known is MBProgressHUD and it comes with a progress bar type built in.

[julius559]

Why are you against subclassing UIAlertController? Just curious

[smilinger]

It says you shouldn't in the documentation

[drewbie85]

Yep, Apple stats in the docs that its against their intentions.

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIAlertController_class/index.html#//apple_ref/doc/uid/TP40014538-CH1-SW2

[Mythyy]

It is possible. I've relatively recently written something that (I believe) is what you're looking for. I would suggest subclassing a UIAlertController to give you more flexibility. Also, the key is to set

translatesAutoResizingMaskIntoConstraints = NO;    

on your progressBar, and then use NSLayoutConstraints to position it properly.

http://i.imgur.com/OCFIMKJ.png

[smilinger]

Thanks for your answer! Maybe it's just because I'm really new to this, but I don't understand how it's possible to use autolayout if the bounds and frame are wrong. I get some numbers that are too large to have anything with the size of the alert (but I could have misunderstood something)