Answer to Challenge: Property List

Objective-C Programming (2nd Edition) 30. Property Lists
1

Hello,

Below is my code for the challenge seems to run nicely

[code]#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

@autoreleasepool {
    
    NSMutableArray *challange = [[NSMutableArray alloc] init];
    
    // Array
    NSArray *itemArray = [[NSArray alloc] initWithObjects:@"Hyper",@"Little",@"Thingy", nil];
    
    [challange addObject:itemArray];
    
    // Dictionary
    NSDictionary *sayWhat = @{@"Mind":@"like water",@"Water":@"Under the bridge"};
    [challange addObject:sayWhat];
    
    // String
    NSString *wowzers = @"Batman";
    [challange addObject:wowzers];
    
    // Data
    NSData *youGotMe = [NSData dataWithContentsOfFile:@"<pulled the path for the cool.txt file created somewhere in this book>"];
    [challange addObject];
    
    // Date
    NSDate *hereComesToday = [NSDate date];
    [challange addObject:hereComesToday];
    
    // Integer
    NSNumber *intMyBent = [NSNumber numberWithInt:100];
    [challange addObject:intMyBent];
    
    // Float
    NSNumber *floatMyboat = [NSNumber numberWithFloat:10010.10010];
    [challange addObject:floatMyboat];
    
    // Boolean
    NSNumber *bohemian = [NSNumber numberWithBool:NO];
    [challange addObject];
    
    // write to a file oooooh
    [challange writeToFile:@"<Where you want it to go>/Challange30.plist"
                atomically:YES];
    
}
return 0;

}[/code]

2

I added my code to the chapter’s example:

[code]#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

@autoreleasepool {
    
    NSMutableArray *stocks = [[NSMutableArray alloc] init];
    NSMutableDictionary *stock;
    NSDateComponents *comps = [[NSDateComponents alloc] init];
    NSCalendar *cal = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

    [comps setYear:2012];
    [comps setDay:15];
    [comps setMonth:07];
    [comps setHour:12];
    [comps setMinute:37];
    [comps setSecond:5];
    
    stock = [NSMutableDictionary dictionary];
    [stock setObject:@"AAPL" forKey:@"symbol"];
    [stock setObject:[NSNumber numberWithInt:200] forKey:@"shares"];
    [stock setObject:[NSNumber numberWithBool:YES] forKey:@"futureBuyDecision"];
    [stock setObject:[NSNumber numberWithFloat:6.5] forKey:@"returnInPercent"];
    [stock setObject:[cal dateFromComponents:comps]  forKey:@"dateOfPurchase"];
    [stock setObject:[NSData dataWithContentsOfFile:@"/tmp/apple-stockz-description.txt"] forKey:@"companyDescription"];
    [stocks addObject:stock];

    [comps setYear:2013];
    [comps setDay:2];
    [comps setMonth:11];
    [comps setHour:9];
    [comps setMinute:55];
    [comps setSecond:43];
    
    stock = [NSMutableDictionary dictionary];
    [stock setObject:@"GOOG" forKey:@"symbol"];
    [stock setObject:[NSNumber numberWithInt:160] forKey:@"shares"];
    [stock setObject:[NSNumber numberWithBool:NO] forKey:@"futureBuyDecision"];
    [stock setObject:[NSNumber numberWithFloat:-2.8] forKey:@"returnInPercent"];
    [stock setObject:[cal dateFromComponents:comps]  forKey:@"dateOfPurchase"];
    [stock setObject:[NSData dataWithContentsOfFile:@"/tmp/google-stockz-description.txt"] forKey:@"companyDescription"];
    [stocks addObject:stock];
    
    [stocks writeToFile:@"/tmp/stocks.plist" atomically:YES];
    
    NSArray *stockList = [NSArray arrayWithContentsOfFile:@"/tmp/stocks.plist"];
    
    for (NSDictionary *d in stockList) {
        NSLog(@"I have %@ shares of %@", [d objectForKey:@"shares"], [d objectForKey:@"symbol"]);
    }
}
return 0;

}[/code]

3

Hi, this was my approach for the Challenge from all types. It prints every value from the property list.

[code]#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

@autoreleasepool {
    
    NSMutableArray *allTypes = [NSMutableArray array];
    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
    [dic setObject:@"This is an example" forKey:@"Dictionary"];
    NSString *string = @"This is a string";
    NSData *data = [[NSData alloc] initWithContentsOfFile:@"/tmp/cool.txt"];
    NSString *dataString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSDate *date = [NSDate date];
    NSNumber *integrr = @5;
    NSNumber *floatrr = @10.4;
    NSNumber *boolT = [[NSNumber alloc] initWithBool:YES];
    
    [allTypes addObject:dic];
    [allTypes addObject:string];
    [allTypes addObject:dataString];
    [allTypes addObject:date];
    [allTypes addObject:integrr];
    [allTypes addObject:floatrr];
    [allTypes addObject:boolT];
    
    [allTypes writeToFile:@"/tmp/plistEx.plist" atomically:YES];
    
    NSArray * dataPlist = [[NSArray alloc] initWithContentsOfFile:@"/tmp/plistEx.plist"];
    NSLog(@"%@", dataPlist);
    
    
}
return 0;

}
[/code]

4

Can we write to .plist files using types other than NSMutableArray?

5

You can use NSDictionary and NSSet as well.