Reading BOOL from plist, writing over it with new value - iphone

Question

I've established how to read a BOOL from a plist, but I don't know how to write over the BOOL value I originally read.
The BOOL I'm reading is buried within my plist. When the view loads I take a dictionary from the plist that contains all the info for the view (detail view at the end of a drill down), and the BOOL is inside that dictionary. I can change the value of the BOOL in the dictionary once it's been brought into the app, but I don't know how to write this back to the postion within the plist.
Hopefully this is making sense?
Cheers!

Answer 1

Write a NSDictionary to a Property List:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:#"FileName.plist"];
NSDictionary *myDict = [[NSDictionary alloc] init];
[myDict setObject:[NSNumber numberWithBool:YES] forKey:#"myKey"];
[myDict writeToFile:filePath atomically:YES];
Read the Boolean:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:#"FileName.plist"];
NSDictionary *myDict = [[NSDictionary alloc] initWithContentsOfFile:filePath];
BOOL myBool = [[myDict objectForKey:#"myKey"] boolValue];
You can also put the filePath code into this function:
- (NSString *)getFilePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:#"FileName.plist"];
return filePath;
}
And use it like this: (for reading)
NSDictionary *myDict = [[NSDictionary alloc] initWithContentsOfFile:[self getFilePath]];
BOOL myBool = [[myDict objectForKey#"myKey"] boolValue];
And this: (for writing)
NSDictionary *myDict = [[NSDictionary alloc] init];
[myDict setObject:[NSNumber numberWithBool:YES] forKey:#"myKey"];
[myDict writeToFile:[self getFilePath] atomically:YES];

Answer 2

For writing BOOL to .plist use below code
NSMutableDictionary* myDict = [NSMutableDictionary dictionaryWithContentsOfFile:plistPath];
[myDict setObject:[NSNumber numberWithBool:YES] forKey:#"LSUIElement"];
[myDict writeToFile:plistPath atomically:NO];
Also have look at the post

Answer 3

Try this function:
-(void) setStringToPropertyList:(NSString*) pList withKey:(NSString*)key andValue:(NSString*)val{
//the path.
NSString *rootPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *plistPath = [rootPath stringByAppendingPathComponent:pList];
//read the dictionary.
NSMutableDictionary *temp = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
//modify the desired key of the dictionary.
[temp setValue:val forKey:key];
//rewrite the diccionary again.
if([temp writeToFile: plistPath atomically:YES]){
NSLog(#"setStringToPropertyList: pList updated");
}else{
NSLog(#"setStringToPropertyList: error writing the file");
}
//memory management
if(!temp) [temp release];
}
This function allows you to write properties to a pList, parameteres:
pList = name of the file
key = key of the property
val = value of the property
Hope it helps.