How to check the Wifi and Internet connection in iPhone/iPad?

To monitor the network state of an iPhone or iPod touch. In particular, it demonstrates how to know when IP can be routed and when traffic will be routed through a Wireless Wide Area Network (WWAN) interface such as EDGE or 3G, Download the sample project.

Network Activity indicator in iPhone/iPad Status Bar

To start the Network Activity Indicator animation:

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

To stop the Network Activity Indicator animation:

[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;