If iOS 7 is so buggy...

A version designed for the presentation.

 

It works fine on my 4S. Some animations are laggy, but that's expected since it's a beta and that they probably had it finely tuned for the 5.

 

He was probably demoing a newer, more stable beta.

 

It even works great for me, and I'm just on an iPhone 4. It doesn't seem laggy to me really. The animations are slower than on iOS 6 or before, but still fluid.

 

Because it was probably an unfinished Alpha copy or a build specifically for a demo, or it wasn't prepared to be pushed out yet.

 

There is a big difference between demoing a few features in front of an audience that you have rehearsed over and over again (and knowing what not to do to avoid a crash or a problem) and actually running the software and using it in the real world.

 

Likely to gain more developer feedback. They can' be showing buggy software on the stage either.

 

How do game developers preview games that still have 6-10 months left to go?

 

It couldn't be an alpha copy because logically it'd be buggier which it didn't appear at all to be.

 

I'm not having too many problems at all really.

 

It was probably the SAME beta we all have, he was likely using much better hardware... which would make a huge difference. Of course, I'm sure every transition, every app etc was all rehearsed and choreographed as well.

 

...what? How exactly would he be using much better hardware, while holding an iPhone 5 in his hand?

 

Could have been a 5S.

 

Highly doubt this. Bugs are bugs and if one is present, it will still show regardless of how good the hardware is. It's likely he was using a newer beta which was more stable and optimized.

 

Likely a newer build and/or some custom tweaks for specific demo items.

 

Yes exactly. I suppose it could've been beta 2 which it wouldn't surprise me if they had been already working on that prior to beta 1's release.

 

And you think it was just an off the shelf phone? If so, you are naive.

I don't have many bugs... at least, not with the default apps. Most bugs are with other apps.

 

THIS. The beta file released and running on people's phones was done in March. I'm sure the one on stage was only a few days old in comparison.

 

Really? How do you know it was done in march?

 

some possibilities:

1. he was running stock apps, no third party installed
2. The demo version of ios7 probably was just a tweaked light built of beta1
3. He was using an iphone 5 with 5s or 6 internal hardware

before they do their presentations they make sure everything is good to go and it's going to be smooth

 

iOS 7 developer preview 1 is actually fairly stable for the most part (aside from missing functionalities), but there are two features that will often bring it to its knee:

1. Background App Refresh: This feature will suck battery like crazy and frequently causes iOS to complete lock up. I strongly recommend turning it off.

2. Multitasking tray: Tinkering with it will eventually cause iOS to reboot. Don't use it.

 

Movie magic. It was all a video that he just tapped on the phone to make you think it was live

 

It may be a special build but it's not a video.