Plist Read and Write iPhone - iphone

Question

I am having troubles with my class which reads and writes data to a plist. Here is some code:
This first chunk is from my custom class with all my plist read and write methods.
-(NSString *) dataFilePath{
NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = [path objectAtIndex:0];
return [documentDirectory stringByAppendingPathComponent:#"userInformation.plist"];
}
-(bool)readUserIsMale{
NSString *filePath = [self dataFilePath];
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
NSDictionary *boolDict = [[NSDictionary alloc] initWithContentsOfFile:[self dataFilePath]];
return [[boolDict objectForKey:#"boolUserIsMale"] boolValue];
}
return nil;
}
-(void)writeUserIsMale:(bool)boolValue{
NSDictionary *boolDict = [[NSDictionary alloc] init];
[boolDict setValue:[NSNumber numberWithBool:boolValue] forKey:#"boolUserIsMale"];
[boolDict writeToFile:[self dataFilePath] atomically:YES];
}
I then in another class where desired import, create and use the class methods:
#import "plistReadWrite.h"
plistReadWrite *readWrite;
If I try and see its value in the console I get (null) return.
NSLog(#"%#",[readWrite readUserIsMale]);
This is of course after I have written some data like so:
[readWrite writeUserIsMale:isUserMale];
isUserMale being a bool value.
Any help would be massively appreciated, if you need anymore info let me know. Thanks.

Answer 1

I think this is mostly correct. In your writeUserIsMale: method you want a mutable dictionary, so you can actually set that key (this should have crashed for you as is, so I'm guessing a copy/paste problem?)
//NSDictionary *boolDict = [[NSDictionary alloc] init];
//should be:
NSMutableDictionary *boolDict = [[NSMutableDictionary alloc] init];
And then when you log the value, remember that bool (or BOOL) are primitives, not objects so:
NSLog (#"%d",[readWrite readUserIsMale]); // Will print 0 or 1
// or if you prefer:
NSLog (#"%#", ([readWrite readUserIsMale]? #"YES":#"NO")); // print YES or NO
Lastly, since this is objective-c, I would probably use BOOL instead of bool.
I'm assuming this is just a simple example, and that you know about NSUserDefaults for this sort of thing.
Hope that helps.