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iPad display Resolutions

iPad 3 - retina display with a resolution of 2048 x 1536 
iPad 2 - 1024-by-768-pixel resolution at 132 pixels per inch (ppi)
iPad 1 - 1024 x 768

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Display 9.7-inch
LED-backlit IPS LCD 9.7-inch
LED-backlit IPS LCD
Resolution 1024 x 768 1024 x 768
Processor 1GHz Apple A4 1GHz dual-core Apple A5
Graphics PowerVR SGX 535 ?
Memory 256MB RAM ?
Storage 16GB / 32GB / 64GB 16GB / 32GB / 64GB
Front camera none VGA
Rear camera none 720p
Cellular radio EDGE plus triband HSPA EDGE plus quadband HSPA or
CDMA / EV-DO Rev. A
WiFi 802.11a/b/g/n 802.11a/b/g/n
Bluetooth 2.1 + EDR 2.1 + EDR
Accelerometer 3-axis 3-axis
Gyroscope No 3-axis
Thickness 13.4mm 8.8mm
Weight 680g (WiFi),
730g (WiFi + 3G) 601g (WiFi),
607g (Verizon),
613g (AT&T)

Introspection and id

Useful to programmatically make use and discover something about an 'id'.

- (BOOL)isKindOfClass:(Class)aClass
- (BOOL)isMemberOfClass:(Class)aClass
- (BOOL)respondsToSelector:(SEL)aSelector
- (BOOL)conformsToProtocol:(Protocol *)aProtocol

id is pointer to any kind of object

id is pointer to any kind of object

While working in Xcode's new storyboard view (Xcode 4) you may find yourself mysteriously looking at some xml, instead of the normal GUI-like view. Don't panic. You are looking at the source code view of your storyboard.

Simply right click on your storyboard file in the navigator view (left-hand side of screen). And open as the Interface Builder - iOS Storyboard.

1. Right click on file
2. Open As -> Interface Builder - iOS Storyboard

iPhone 4.2.1 Build 4D502

Updating Xcode from 4.1 to 4.2.1

Apple's Xcode has an update available from the App Store.

• Version: 4.2.1


• Released: 17-Nov-2011


• Size: 1.80 GB


• Release Notes