5. Life Cycle Of View Controller
ï€ viewWillAppear: Called just before a controllerâs view
appears
ï€ viewDidAppear: Called after a controllerâs view appears
ï€ viewWillDisappear: Called just before a controllerâs view
disappears
ï€ viewDidDisappear: Called after a controllerâs view
disappears
9. Plist
ï€ When you persist an array or dictionary (i.e., a property
list with multiple values), the plistâs underlying format is
XML.
ï€ NSArray * myArray = [[NSArray alloc]
initWithObjects:@"first", @"second",@"third",nil];