CODEWITHSUNDEEP
objective-c
Cadrick Loh
Cadrick Loh

Reputation: 721

Can't save to plist

I have my own object class from inherited from NSObject

@interface BlockedCell : NSObject 
{
    NSValue *gridValue;
    NSString *name;
}

@property (nonatomic, retain) NSValue *gridValue;
@property (nonatomic, retain) NSString *name;

@end

So I try to create a few objects:

NSMutableDictionary *dict = [[dict alloc] init];
for (int i = 0; i < 5; ++i)
{
    BlockedCell *block = [[BlockedCell alloc] init];
    block.gridValue = [NSValue valueWithCGPoint: CGPointMake(0.0f, 0.0f)];
    block.name = @"something";
    [dict setObject: block forKey: [NSString stringWithFormat: @"item_%d", i]];
    [block release];
}

if([dict writeToFile: path atomic: YES])
   NSLog(@"Saved");
else
   NSLog(@"Failed to save");

[dict release];

And what I get for the output is "Failed to save".. If my dictionary does not contains any data, then it will output "Saved"

EDIT: After I did more testing, I found out that actually is the NSValue causing the saving failed. So what should I do if I want to save CGPoint into plist?

Upvotes: 0

Views: 1067

Answers (2)

ajay
ajay

Reputation: 3345

you cant save NSValue directly.In your case you have to save a point in the form ofstring use below line

CGPoint point = CGPointMake(10.0,20.0) //you need to translate the point into a compatible "Plist" object such as NSString //luckily, there is a method for that

[rectArray addObject:NSStringFromPoint(point)];

//save into a plist .....

on retrieval of this value

CGPoint Point = CGPointFromString([rectArray objectAtIndex:0]);

Upvotes: 1

rob mayoff
rob mayoff

Reputation: 386038

As you discovered, property lists cannot store NSValue objects directly. The supported classes are NSData, NSString, NSArray, NSDictionary, NSDate, and NSNumber, as documented in the NSPropertyListSerialization Class Reference.

The easiest workaround would be to use NSString instead of NSValue:

block.gridString = NSStringFromCGPoint(CGPointZero);

CGPoint point = CGPointFromString(block.gridString);

Upvotes: 2

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