/*

Copyright (C) 2015 Apple Inc. All Rights Reserved.

See LICENSE.txt for this sample’s licensing information

Abstract:

A simple view controller that manages a content view.

*/

#import "TextViewController.h"

#import "BannerViewController.h"

@interface TextViewController ()

@property (nonatomic, weak) IBOutlet UITextView *textView;

@property (nonatomic, weak) IBOutlet UILabel *timerLabel;

@property (nonatomic, strong) NSTimer *timer;

@property (nonatomic, assign) CFTimeInterval ticks;

@end

@implementation TextViewController

#pragma mark - UIViewController Life Cycle

- (void)viewDidLoad {

    [super viewDidLoad];

    self.textView.text = self.text;

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willBeginBannerViewActionNotification:) name:BannerViewActionWillBegin object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didFinishBannerViewActionNotification:) name:BannerViewActionDidFinish object:nil];

}

- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];

    [self.textView scrollRangeToVisible:(NSRange){0, 0}];

}

- (void)viewDidAppear:(BOOL)animated {

    [super viewDidAppear:animated];

    [self startTimer];

}

- (void)viewDidDisappear:(BOOL)animated {

    [super viewDidDisappear:animated];

    [self stopTimer];

}

- (void)dealloc {

    [[NSNotificationCenter defaultCenter] removeObserver:self name:BannerViewActionWillBegin object:nil];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:BannerViewActionDidFinish object:nil];

}

#pragma mark - Accessors

- (void)setText:(NSString *)text {

    _text = [text copy];

}

#pragma mark - Workers

- (void)startTimer {

    if (self.timer == nil) {

        self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(timerTick:) userInfo:nil repeats:YES];

    }

}

- (void)stopTimer {

    [self.timer invalidate];

    self.timer = nil;

}

- (void)timerTick:(NSTimer *)timer {

    // Timers are not guaranteed to tick at the nominal rate specified, so this isn't technically accurate.

    // However, this is just an example to demonstrate how to stop some ongoing activity, so we can live with that inaccuracy.

    self.ticks += 0.1;

    double seconds = fmod(self.ticks, 60.0);

    double minutes = fmod(trunc(self.ticks / 60.0), 60.0);

    double hours = trunc(self.ticks / 3600.0);

    self.timerLabel.text = [NSString stringWithFormat:@"%02.0f:%02.0f:%04.1f", hours, minutes, seconds];

}

#pragma mark - NSNotification CallBacks

- (void)willBeginBannerViewActionNotification:(NSNotification *)notification {

    [self stopTimer];

}

- (void)didFinishBannerViewActionNotification:(NSNotification *)notification {

    [self startTimer];

}

@end