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Will my iphone 3gs app work ok on iphone 4?

Answer 1

+1 A:

Yes you can change your device type, by in the simulator pressing: Hardware->Device->iPhone 4 If you don't have it you might want download the latest devevloper tools.

Also you might have to press Window->Scale->100%

Justin Meiners 2010-09-06 04:12:43

interestingly enough, my program looks exactly the same in both simulated devices. even the images look about the same (as far as pixelation goes). maybe the simulator has some bugs?.. hrmmmmm

Shnitzel 2010-09-06 04:21:57

Well you have to set it to the full view to see it at the actual resolution right now you are probably looking at it at standard resolution press Window->Scale->100%

Justin Meiners 2010-09-06 04:59:20

hrmph.. the window/scale doesn't let me pick any options. (they are greyed out)

Shnitzel 2010-09-07 00:54:53

What is your screen resolution?

Justin Meiners 2010-09-07 01:52:56

Answer 2

+1 A:

Basically any bitmap graphics (PNG files) will look a little blurry on the iPhone 4's Retina display.

The easiest way to fix this is to make double scaled versions (100x100 becomes 200x200) of all your PNG files and add them to your project suffixed with "@2x.png". In other words, MyBitmap.png will become [email protected]. Luckily your code doesn't have to change. On the iPhone 4 the OS will automatically choose a @2x.png instead of the regular one when you do:

UIImage *myBitmap = [UIImage imageNamed:@”MyBitmap.png”];

Xib files will also use the @2x.png if there is one available.

Other than that there's also launch images and Application Icons to worry about. This blog has a good summary.

wm_eddie 2010-09-06 04:18:04

okay, that's good to know. do you think the simulator should show this difference if i put those higher images in? i've not found the simulator to show much of a difference between between 3gs/4 so far.. i.e., it doesn't pixelate the images that are currently set to 3gs resolution...

Shnitzel 2010-09-06 04:23:55

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Will my iphone 3gs app work ok on iphone 4?

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