Objective-C write array to .plist - objective-c

Question

I have pre-filled information except one string, which will be input by the user. I currently am able to read only a single key with this code:
#define defaultValue #"Someone"
#define myKey #"Event"
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *val = [defaults stringForKey:myKey];
if (val == nil) val = defaultValue;
[myTextField setStringValue:val];
I write it with this code:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *val;
// Get the new value from the textfield
val = [myTextField stringValue];
if ([val isEqualToString:defaultValue]) {
[defaults removeObjectForKey:myKey];
} else {
[defaults setObject:val forKey:myKey];
}
What I really need is to write an array to a .plist like this, and have the 5th string able to be a user input string. How can I do this?:
<plist version="1.0">
<dict>
<key>Event/key>
<dict>
<key>Staff Meeting</key>
<string>Friday Feb 3rd, 2012 </string>
<key>Contact</key>
<string>events#whitehouse.gov</string>
<key>URL</key>
<string>http://www.whitehouse.gov</string>
<key>Status</key>
<string>ATTENDING</string>
<key>Name</key>
<string>Mr. President</string> <------- USER TEXT INPUT
<key>Signature</key>
<data>
20001
</data>
</dict>
</dict>
</plist>

Answer 1

Here an example to create the structure you want.
-(void)saveData:(NSString*)someParam
{
NSMutableDictionary *rootObj = [NSMutableDictionary dictionaryWithCapacity:1];
NSDictionary *innerDict;
NSString *staffMeetingValue;
NSString *contactValue;
NSString *nameValue;
staffMeetingValue = #"Friday Feb 3rd, 2012";
contactValue = #"events#whitehouse.gov";
nameValue = someParam;
innerDict = [NSDictionary dictionaryWithObjects:
[NSArray arrayWithObjects: staffMeetingValue, contactValue, nameValue, nil]
forKeys:[NSArray arrayWithObjects:#"Staff Meeting", #"Contact", #"Name"]];
[rootObj setObject:innerDict forKey:#"Event"];
id plist = [NSPropertyListSerialization dataFromPropertyList:(id)rootObj
format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];
}
For other info see Creating Property Lists Programmatically
Hope it helps.
P.S. You have to add keys and objects for other tags. I skipped them for the sake of simplicity.
Edit:
This is a simple example how to do that. staffMeetingValue and contactValue values are hardcoded but you can pass it as parameters as nameValue.
-(void)saveDataWithName:(NSString*)nameValue staffMeting:(NSString*)staffMetingValue contact:(NSString*)contactValue {
// previous stuff here
}