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#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end

#import "AppDelegate.h"
#import "ViewController.h"

@interface AppDelegate ()

@property (nonatomic,strong) ViewController *viewController;
@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.viewController = [[ViewController alloc] initWithNibName:nil bundle:nil];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.rootViewController = self.viewController;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}

@end

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>

@end

#import "ViewController.h"

@interface ViewController ()
@property (nonatomic,strong) NSMutableArray *randomNumbers;
@property (nonatomic,strong) UITableView *myTableView;
@end

@implementation ViewController

-(NSString *) fileLocation{
NSArray *folders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
if ([folders count] == 0) {
return nil;
}
NSString *documentsFolder = [folders objectAtIndex:0];
return [documentsFolder stringByAppendingPathComponent:@"list.txt"];
}

- (BOOL)hasFileAlreadyBeenCreated{
BOOL result = NO;
NSFileManager *fileManager = [[NSFileManager alloc] init];
if ([fileManager fileExistsAtPath:[self fileLocation]]) {
result = YES;
}
return result;
}

- (void)viewDidLoad {
[super viewDidLoad];
dispatch_queue_t concurrentQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(concurrentQueue, ^{
NSUInteger numberOfValuesRequired = 10000;
if ([self hasFileAlreadyBeenCreated] == NO) {
dispatch_sync(concurrentQueue, ^{
NSMutableArray *arrayOfRandomNumbers = [[NSMutableArray alloc] initWithCapacity:numberOfValuesRequired];
NSUInteger counter = 0;
for (counter = 0; counter < numberOfValuesRequired; counter++) {
unsigned int randomNumber = arc4random() %((unsigned int)RAND_MAX + 1);
[arrayOfRandomNumbers addObject:[NSNumber numberWithUnsignedInt:randomNumber]];
}
[arrayOfRandomNumbers writeToFile:[self fileLocation] atomically:YES];
});
}

dispatch_sync(concurrentQueue, ^{
if ([self hasFileAlreadyBeenCreated]) {
self.randomNumbers = [[NSMutableArray alloc] initWithContentsOfFile:[self fileLocation]];
[self.randomNumbers sortUsingComparator:^NSComparisonResult(id obj1,id obj2){
NSNumber *number1 = (NSNumber *)obj1;
NSNumber *number2 = (NSNumber *)obj2;
return [number1 compare:number2];
}];
}
});

dispatch_sync(dispatch_get_main_queue(), ^{
if ([self.randomNumbers count] > 0) {
self.myTableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
self.myTableView.delegate = self;
self.myTableView.dataSource = self;
self.myTableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.view addSubview:self.myTableView];
}
});
});
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.randomNumbers.count;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *result = nil;
static NSString *TableViewCellIdentifer = @"MyCells";
result = [tableView dequeueReusableCellWithIdentifier:TableViewCellIdentifer];
if (result == nil) {
result = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:TableViewCellIdentifer];
result.textLabel.text = [NSString stringWithFormat:@"%d",self.randomNumbers[indexPath.row]];
}
return result;
}

@end