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NSString *customURL = @"facebook://";
 
  if ([[UIApplication sharedApplication] 
    canOpenURL:[NSURL URLWithString:customURL]])
    {
      // App fb có cài
      return YES;
    }
    else
    {

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- (void) mergeAVAssetByArrAsset:(NSArray *) arrAsset
{
    AVMutableComposition * composition = [AVMutableComposition composition];
    
    for (AVAsset *asset in arrAsset)
    {
        CMTimeRange timeRange = CMTimeRangeMake(kCMTimeZero, asset.duration);
        
        [composition insertTimeRange:timeRange ofAsset:asset atTime:composition.duration error:nil];
    }

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        __weak FePreviewVideoViewController *weakSelf = self;
        timeObserver = [_player addPeriodicTimeObserverForInterval:CMTimeMake(15, 1) queue:dispatch_get_main_queue() usingBlock:^(CMTime time)
                       {
                           typeof(self) strongSelf = weakSelf;
                           
                           CGFloat currentTime = CMTimeGetSeconds(time);
                           
                           if (currentTime >= 15)
                           {
                                [strongSelf.player pause];

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-(void) addNewItemFromArray:(NSArray *) newArrItem
{
        // Add
        [_arrPhotos addObjectsFromArray:newArrItem];
        
        NSMutableArray *arrNewIndexpath = [NSMutableArray array];
        for (NSInteger i = _arrPhotos.count ; i < _arrPhotos.count +  newArrItem.count ; i++)
        {
                NSIndexPath *newIndexPath = [NSIndexPath indexPathForRow:i inSection:0];
                [arrNewIndexpath addObject:newIndexPath];

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@interface UIImage (Orientation)

- (UIImage*)imageByNormalizingOrientation;

@end


@implementation UIImage (Orientation)

- (UIImage*)imageByNormalizingOrientation {

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// Add catefory
@interface UIButton (Sound)

@end

#import "UIButton+Sound.h"
#import <objc/runtime.h>

@implementation UIButton (Sound)

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#import <Mantle.h>

@interface BaseModel : MTLModel <MTLJSONSerializing>

@property (nonatomic) int64_t id;
@property (nonatomic) NSTimeInterval createdUtc;
@property (nonatomic) NSTimeInterval modifiedUtc;

- (NSString *)createTableStatement;
- (NSString *)className;

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// Taken from the commercial iOS PDF framework http://pspdfkit.com.
// Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved.
// Licensed under MIT (http://opensource.org/licenses/MIT)
//
// You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it.

#import <objc/runtime.h>
#import <objc/message.h>

// Compile-time selector checks.

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

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Difference between Debounce and Throttle

Debounce

Debounce a function when you want it to execute only once after a defined interval of time. If the event occurs multiple times within the interval, the interval is reset each time.
Example A user is typing into an input field and you want to execute a function, such as a call to the server, only when the user stops typing for a certain interval, such as 500ms.

Throttle