CwngaIOSStudy

Dismiss multi modal view controller

SKImageLikeAnimationView and UIImageLikeAnimationView

-(void)fireImage:(UIImage *)image size:(CGSize)size duration:(CGFloat)duration scale:(CGFloat)scale alpha:(CGFloat)alpha

WKWebView

Ch1

intro WKUserScript, it can injection at begin or end time

WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init]; NSString *myScriptSource = @"document.body.style.background = "#777";"; WKUserScript *myUserScript = [[WKUserScript alloc] initWithSource:myScriptSource injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:NO]; WKUserContentController *userContentController = [[WKUserContentController alloc] init]; [userContentController addUserScript:myUserScript]; config.userContentController = userContentController; self.wkWekView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config];
intro javascript post message and Objective c code can communicate with it

WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init]; WKUserContentController *userContentController = [[WKUserContentController alloc] init]; config.userContentController = userContentController; ... //this is test code to simulate javascript set message, you also implement on HTML NSString *myScriptSource1 = @"
function postMyMessage() {
var message = { 'message' : 'Hello, World!', 'numbers' : [ 1, 2, 3 ] };
window.webkit.messageHandlers.myName.postMessage(message);
}
postMyMessage();
";

WKUserScript *myUserScript1 = [[WKUserScript alloc] initWithSource:myScriptSource1 injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES]; [userContentController addUserScript:myUserScript1]; [userContentController addScriptMessageHandler:self name:@"myName"];//self need implemnt - (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message ... self.wkWekView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config];

Ch2

intro different WK store

WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init]; config.processPool = [[WKProcessPool alloc] init]; config.websiteDataStore = [WKWebsiteDataStore nonPersistentDataStore]; //if you do not set data store, they will use default data store self.wkWekView1 = [[WKWebView alloc] initWithFrame:self.view1.bounds configuration:config]; self.wkWekView1.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight; self.wkWekView1.frame = self.view1.bounds; [self.view1 addSubview:self.wkWekView1];

[self.wkWekView1 loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://tw.yahoo.com"]]];

WKWebViewConfiguration *config2 = [[WKWebViewConfiguration alloc] init]; config2.processPool = [[WKProcessPool alloc] init]; config2.websiteDataStore = [WKWebsiteDataStore nonPersistentDataStore]; //NOTE: different cookie store, if no set this, will use same store, for all wkwebview self.wkWekView2 = [[WKWebView alloc] initWithFrame:self.view2.bounds configuration:config2]; self.wkWekView2.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight; self.wkWekView2.frame = self.view2.bounds; [self.view2 addSubview:self.wkWekView2]; [self.wkWekView2 loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://tw.yahoo.com"]]];

Ch4

js alert, confirm, prompt handle in WKWebView -- set WkView.UIDelegate

self.wkWekView.UIDelegate = self;

-- implement UIDelegate function

user UIAlertController to hanlde js interaction with user

//hanle JS alert
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler
{

    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@""
                                                                             message:message
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確認"
                                                        style:UIAlertActionStyleDefault
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler();
                                                      }]];
    [self presentViewController:alertController animated:YES completion:nil];
}

//hanle JS confirm
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler
{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@""
                                                                             message:message
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"取消"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler(NO);
                                                      }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確認"
                                                        style:UIAlertActionStyleDefault
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler(YES);
                                                      }]];
    [self presentViewController:alertController animated:YES completion:nil];

}

//handle JS prompt
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * _Nullable result))completionHandler
{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@""
                                                                             message:prompt
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"取消"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler(nil);
                                                      }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確認"
                                                        style:UIAlertActionStyleDefault
                                                      handler:^(UIAlertAction *action) {
                                                          NSString *text = [alertController.textFields firstObject].text.length > 0 ? [alertController.textFields firstObject].text : defaultText;
                                                          completionHandler(text);
                                                      }]];
    [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {

    }];
    [self presentViewController:alertController animated:YES completion:nil];
    
}

Leetcode

Decode Ways

hint: dp
normal case: think about 11 => to be 2(1+1, 11), will be 2
edge case: think about 01 => to be 0, can not begin with "0"

think about 01 => to be 0, can not begin with "0"

think about 10 => to be 1, can not 1=>A + 0=>?, will not be 2

think about 191 =>

1 => 1;
19 => 1+9, 19
191 => 1+9+1, 19+1, (can not i-2 result (1+91))
so answer to be 2

https://leetcode.com/problems/decode-ways/

Contains Duplicate III

https://leetcode.com/problems/contains-duplicate-iii/

3Sum

https://leetcode.com/problems/3sum/

Largest Number

https://leetcode.com/problems/largest-number/

Palindrome Partitioning II

https://leetcode.com/problems/palindrome-partitioning-ii/

hint:

//check aba, abba,

for (NSInteger i = 0; i < string.length; i++) {
    for (NSInteger j=0;
         i-j>=0 && i+j <= string.length -1 && [string characterAtIndex:i-j] ==[string characterAtIndex:i+j];
         j++) {
        //for aba
        NSInteger min = MIN([minCutDic[@(i-j-1)] integerValue] + 1, [minCutDic[@(i+j)] integerValue]) ;
        minCutDic[@(i+j)] = @(min);
    }
    for (NSInteger j=0;
         i-j>=0 && i+j <= string.length -1 && [string characterAtIndex:i-j-1] == [string characterAtIndex:i+j];
         j++) {
        //for i = 2, j = 1, abba

        NSInteger min = MIN([minCutDic[@(i-j-2)] integerValue] + 1, [minCutDic[@(i+j)] integerValue]) ;
        minCutDic[@(i+j)] = @(min);
    }
}

Longest Substring Without Repeating Characters

https://leetcode.com/problems/longest-substring-without-repeating-characters/

-> abcabcbb
NSInteger max = 0;
NSMutableDictionary *charLastIndexMap = [NSMutableDictionary dictionary];///map to record char last index.
for (NSInteger i = 0, j = 0; i < string.length; i++) {
    NSString *chart = [string substringWithRange:NSMakeRange(i, 1)];
    if (charLastIndexMap[chart]) {
        j = MAX(j, [charLastIndexMap[chart] integerValue] + 1); ///< abba, i=2, j befor:0, after:b:1+1=>2,get string:b | i=3, j:2, a:0+1=1 < j(2), no update j, will get substring: ba
    }
    charLastIndexMap[chart] = @(i); 
    max = MAX(max, i - j + 1);      

}
return max;
///input: abcabcbb
Test Case '-[LongestSubstringWithoutRepeatingCharactersSpec TestLongestSubstringWithoutRepeatingCharacters_Test_2]' started.
2016-12-04 17:57:21.523 CwngaIOSStudy[91415:1579478] charLastIndexMap:{
}
2016-12-04 17:57:21.523 CwngaIOSStudy[91415:1579478] ===Loop=i:(0),j,(0)==
2016-12-04 17:57:21.523 CwngaIOSStudy[91415:1579478] substring:start:[i(0)-j(0)], length:(1), text:(a)
2016-12-04 17:57:21.524 CwngaIOSStudy[91415:1579478] new max:1
2016-12-04 17:57:21.524 CwngaIOSStudy[91415:1579478] charLastIndexMap:{
    a = 0;
}
2016-12-04 17:57:21.524 CwngaIOSStudy[91415:1579478] ===Loop=i:(1),j,(0)==
2016-12-04 17:57:21.524 CwngaIOSStudy[91415:1579478] substring:start:[i(1)-j(0)], length:(2), text:(ab)
2016-12-04 17:57:21.525 CwngaIOSStudy[91415:1579478] new max:2
2016-12-04 17:57:21.525 CwngaIOSStudy[91415:1579478] charLastIndexMap:{
    a = 0;
    b = 1;
}
2016-12-04 17:57:21.533 CwngaIOSStudy[91415:1579478] ===Loop=i:(2),j,(0)==
2016-12-04 17:57:21.533 CwngaIOSStudy[91415:1579478] substring:start:[i(2)-j(0)], length:(3), text:(abc)
2016-12-04 17:57:21.533 CwngaIOSStudy[91415:1579478] new max:3
2016-12-04 17:57:21.533 CwngaIOSStudy[91415:1579478] charLastIndexMap:{
    a = 0;
    b = 1;
    c = 2;
}
2016-12-04 17:57:21.533 CwngaIOSStudy[91415:1579478] ===Loop=i:(3),j,(0)==
2016-12-04 17:57:21.534 CwngaIOSStudy[91415:1579478] ===MAPPED===
2016-12-04 17:57:21.534 CwngaIOSStudy[91415:1579478] charLastIndexMap[chart]{a} => 0
2016-12-04 17:57:21.534 CwngaIOSStudy[91415:1579478] j:0
2016-12-04 17:57:21.534 CwngaIOSStudy[91415:1579478] substring:start:[i(3)-j(1)], length:(3), text:(bca)
2016-12-04 17:57:21.534 CwngaIOSStudy[91415:1579478] new max:3
2016-12-04 17:57:21.534 CwngaIOSStudy[91415:1579478] charLastIndexMap:{
    a = 3;
    b = 1;
    c = 2;
}
2016-12-04 17:57:21.535 CwngaIOSStudy[91415:1579478] ===Loop=i:(4),j,(1)==
2016-12-04 17:57:21.535 CwngaIOSStudy[91415:1579478] ===MAPPED===
2016-12-04 17:57:21.535 CwngaIOSStudy[91415:1579478] charLastIndexMap[chart]{b} => 1
2016-12-04 17:57:21.558 CwngaIOSStudy[91415:1579478] j:1
2016-12-04 17:57:21.558 CwngaIOSStudy[91415:1579478] substring:start:[i(4)-j(2)], length:(3), text:(cab)
2016-12-04 17:57:21.558 CwngaIOSStudy[91415:1579478] new max:3
2016-12-04 17:57:21.559 CwngaIOSStudy[91415:1579478] charLastIndexMap:{
    a = 3;
    b = 4;
    c = 2;
}
2016-12-04 17:57:21.559 CwngaIOSStudy[91415:1579478] ===Loop=i:(5),j,(2)==
2016-12-04 17:57:21.559 CwngaIOSStudy[91415:1579478] ===MAPPED===
2016-12-04 17:57:21.559 CwngaIOSStudy[91415:1579478] charLastIndexMap[chart]{c} => 2
2016-12-04 17:57:21.559 CwngaIOSStudy[91415:1579478] j:2
2016-12-04 17:57:21.559 CwngaIOSStudy[91415:1579478] substring:start:[i(5)-j(3)], length:(3), text:(abc)
2016-12-04 17:57:21.559 CwngaIOSStudy[91415:1579478] new max:3
2016-12-04 17:57:21.560 CwngaIOSStudy[91415:1579478] charLastIndexMap:{
    a = 3;
    b = 4;
    c = 5;
}
2016-12-04 17:57:21.560 CwngaIOSStudy[91415:1579478] ===Loop=i:(6),j,(3)==
2016-12-04 17:57:21.560 CwngaIOSStudy[91415:1579478] ===MAPPED===
2016-12-04 17:57:21.560 CwngaIOSStudy[91415:1579478] charLastIndexMap[chart]{b} => 4
2016-12-04 17:57:21.560 CwngaIOSStudy[91415:1579478] j:3
2016-12-04 17:57:21.560 CwngaIOSStudy[91415:1579478] substring:start:[i(6)-j(5)], length:(2), text:(cb)
2016-12-04 17:57:21.560 CwngaIOSStudy[91415:1579478] new max:3
2016-12-04 17:57:21.561 CwngaIOSStudy[91415:1579478] charLastIndexMap:{
    a = 3;
    b = 6;
    c = 5;
}
2016-12-04 17:57:21.561 CwngaIOSStudy[91415:1579478] ===Loop=i:(7),j,(5)==
2016-12-04 17:57:21.561 CwngaIOSStudy[91415:1579478] ===MAPPED===
2016-12-04 17:57:21.561 CwngaIOSStudy[91415:1579478] charLastIndexMap[chart]{b} => 6
2016-12-04 17:57:21.561 CwngaIOSStudy[91415:1579478] j:5
2016-12-04 17:57:21.561 CwngaIOSStudy[91415:1579478] substring:start:[i(7)-j(7)], length:(1), text:(b)
2016-12-04 17:57:21.562 CwngaIOSStudy[91415:1579478] new max:3
2016-12-04 17:57:21.562 CwngaIOSStudy[91415:1579478] charLastIndexMap:{
    a = 3;
    b = 7;
    c = 5;
}
2016-12-04 17:57:21.562 CwngaIOSStudy[91415:1579478] charLastIndexMap:{
    a = 3;
    b = 7;
    c = 5;
}
2016-12-04 17:57:21.562 CwngaIOSStudy[91415:1579478] max:3

Simplify Path

(TODO)https://leetcode.com/problems/simplify-path/

Maximum Product Subarray

https://leetcode.com/problems/maximum-product-subarray/

dp {min: max:}

NSInteger min = MIN(MIN(tmp1, tmp2), [nums[i] integerValue]); //最小和自己比一次 NSInteger max = MAX(MAX(tmp1, tmp2), [nums[i] integerValue]); //最大和自己比一次

Longest Palindromic Substring

https://leetcode.com/problems/longest-palindromic-substring/ -> aa -> aba

Add Two Numbers

https://leetcode.com/problems/add-two-numbers/

Count Complete Tree Nodes

https://leetcode.com/problems/count-complete-tree-nodes/

https://en.wikipedia.org/wiki/Binary_tree#Types_of_binary_trees

Two Sum

MaxSequenceSubArrayCount

Word Break

https://leetcode.com/problems/word-break/

Minimum Size Subarray Sum

https://leetcode.com/problems/minimum-size-subarray-sum/

Maximum Depth of Binary Tree

https://leetcode.com/problems/maximum-depth-of-binary-tree/

Algorithm

Binary Tree Ordering

node structure

@interface Node : NSObject

@property (assign, nonatomic) CGFloat value;
@property (strong, nonatomic) Node *leftNode;
@property (strong, nonatomic) Node *rightNode;

@end

insert node

- (Node *)insertNewNode:(Node *)newNode withParentNode:(Node *)parentNode
{

    if (!parentNode) {
        parentNode = newNode;

    } else {
        if (newNode.value >= parentNode.value) {
            if (parentNode.rightNode) {
                [self insertNewNode:newNode withParentNode:parentNode.rightNode];
            } else {
                parentNode.rightNode = newNode;
            }
        } else {
            if (parentNode.leftNode) {
                [self insertNewNode:newNode withParentNode:parentNode.leftNode];
            } else {
                parentNode.leftNode = newNode;
            }
        }
    }
    return  parentNode;
}

inorder, preorder, postorder

- (NSArray *)inOrder:(Node *)node array:(NSMutableArray *)array
{
    if (node) {
        [self inOrder:node.leftNode array:array];
        [array addObject:node];
        [self inOrder:node.rightNode array:array];
    }
    return nil;
}

- (NSArray *)preOrder:(Node *)node array:(NSMutableArray *)array
{
    if (node) {
        [array addObject:node];
        [self preOrder:node.leftNode array:array];
        [self preOrder:node.rightNode array:array];
    }
    return nil;
}
- (NSArray *)postOrder:(Node *)node array:(NSMutableArray *)array
{
    if (node) {
        [self postOrder:node.leftNode array:array];

        [self postOrder:node.rightNode array:array];
        [array addObject:node];
    }
    return nil;
}

ADK

DynamicHeight Cell(label)

NEED add view width constraint

DynamicHeightViewController

cell.cellWidth.constant = collectionView.bounds.size.width; //width constraint
CGSize preferredSize = CGSizeMake(self.collectionView.bounds.size.width, 0.0f);
CollectionViewCell *cell = (CollectionViewCell *)[[ADKNibCacheManager sharedInstance] instanceForNibNamed:CollectionViewCellIdentifier];
cell.titleLabel.text = [self stringWithMulti:indexPath.row];
CGSize size = [[ADKCellDynamicSizeCalculator sharedInstance] sizeForDynamicHeightCellInstance:cell preferredSize:preferredSize];
return size;

DynamicHeight Cell(textview)

DynamicTextViewHeightViewController

cell text view add height constraint ex:TextViewCollectionViewCell

code:

@property (weak, nonatomic) IBOutlet NSLayoutConstraint *textViewHeightConstraint;

calculate text view height constraint ([cell.textView sizeThatFits:CGSizeMake(cell.textView.frame.size.width, FLT_MAX)];)

code:

CGSize textViewSize = [cell.textView sizeThatFits:CGSizeMake(cell.textView.frame.size.width, FLT_MAX)]; ///<NOTE set 
CGSize preferredSize = CGSizeMake(self.collectionView.bounds.size.width, 0.0f);
TextViewCollectionViewCell *cell = (TextViewCollectionViewCell *)[[ADKNibCacheManager sharedInstance] instanceForNibNamed:TextViewCollectionViewCellIndentifier];

cell.textView.text = [self stringWithMulti:indexPath.row];
CGSize textViewSize = [cell.textView sizeThatFits:CGSizeMake(cell.textView.frame.size.width, FLT_MAX)];

cell.textViewHeightConstraint.constant = textViewSize.height;
CGSize size = [[ADKCellDynamicSizeCalculator sharedInstance] sizeForDynamicHeightCellInstance:cell preferredSize:preferredSize];

CollectionView

Ch2CollectionViewReladViewController

if reload reloadItemsAtIndexPaths first, will block reloadData call cellForItemAtIndexPath:

[self.collectionView reloadItemsAtIndexPaths:self.collectionView.indexPathsForVisibleItems];//enableSetData = NO
self.enableSetData = YES;
[self.collectionView reloadData];//will only call size, will not call cellForItemAtIndexPath:

ReactiveCocoaStudy

ch1

1. rac_textSignal

[self.textField.rac_textSignal subscribeNext:^(id input) {
    NSLog(@"input:%@", input);
}];

2. add filter: ex input.lenght >= 2

[[self.textField.rac_textSignal filter:^BOOL(NSString * input) {
    return input.length >= 2;
}] subscribeNext:^(id input) {
    NSLog(@"input:%@", input);
}];

3. throttle

[[[self.textField.rac_textSignal filter:^BOOL(NSString * input) {
    return input.length >= 2;
}] throttle:0.6f
  ] subscribeNext:^(id input) {
    NSLog(@"input:%@", input);
}];

4. call RACSignal createSignal -> use flattenMap to chagen signal

[RACSignal createSignal:];

- (RACSignal *)signalForQuery:(NSString *)query
{
    RACSignal *signal = [[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        NSString *q = [[NSString stringWithFormat:@"SELECT * FROM ecsearch.std.search (0, 10) WHERE keyword=\"%@\" and property=\"auction\" and sortBy=\"price\" and sortOrder=\"asc\"", query] stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLHostAllowedCharacterSet]];

        NSString *urlString = [NSString stringWithFormat:@"https://auction.yql.yahoo.com/v1/public/yql?q=%@&format=json", q];

        NSURL *url = [NSURL URLWithString:urlString];
        NSURLSession *session = [NSURLSession sharedSession];
        NSURLSessionDataTask *dataTask = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

            if (error) {
                [subscriber sendError:error];
            } else {
                NSError *jsonError;
                id json= [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&jsonError];
                if (jsonError) {
                    [subscriber sendError:jsonError];
                } else {
                    [subscriber sendNext:json];
                }
            }
            [subscriber sendCompleted];


        }];
        [dataTask resume];
        return [RACDisposable disposableWithBlock:^{
            [dataTask cancel];
        }];
    }] retry:5];
    return signal;
}

flattenMap to chagen signal

[[[[self.textField.rac_textSignal
    filter:^BOOL(NSString * input) {
        return input.length >= 2;
    }] throttle:0.6f
   ] flattenMap:^RACStream *(NSString *value) {
    return [self signalForQuery:value];
}] subscribeNext:^(id input) {
    NSLog(@"input:%@", input); //will change to api response
}];

###ch2 usage of deliverOn, bind data signal to update, rac_liftSelector...

case 1: deliverOn:[RACScheduler mainThreadScheduler]] for updateing UI

[[[[[self.textField.rac_textSignal
      filter:^BOOL(NSString * input) {
          return input.length >= 2;
      }] throttle:0.6f
     ] flattenMap:^RACStream *(NSString *value) {
     return [self signalForQuery:value];
 }] deliverOn:[RACScheduler mainThreadScheduler]]  //update UI need on main thread
  subscribeNext:^(id input) {
      self.data = [input valueForKeyPath:@"query.results.product"];
      NSLog(@"input:%@", input); //will change to api response
      [self.collectionView reloadData];
}];

case 2: bind data to update

///NOTE: Bind data to update
[[[[self.textField.rac_textSignal
    filter:^BOOL(NSString * input) {
        return input.length >= 2;
    }] throttle:0.6f
   ] flattenMap:^RACStream *(NSString *value) {
    return [self signalForQuery:value];
}]
 subscribeNext:^(id input) {
     self.data = [input valueForKeyPath:@"query.results.product"];
     NSLog(@"input:%@", input); //will change to api response
     //[self.collectionView reloadData]; //DELETE for data as signal
 }];

//data as signal
RACSignal *dataSignal = [self rac_valuesForKeyPath:@"data" observer:self];
[[dataSignal deliverOnMainThread ]subscribeNext:^(id x) {
    //update ui in main thread
    [self.collectionView reloadData];
}];

rac_liftSelector

RACSignal *didSelectedSignal = [[self rac_signalForSelector:@selector(collectionView:didSelectItemAtIndexPath:) fromProtocol:@protocol(UICollectionViewDelegate)]
                                map:^id(RACTuple *racTuple) {
                                    NSLog(@"racTuple:%@", racTuple.second);
                                    return racTuple.second;
                                }];

[didSelectedSignal subscribeNext:^(NSIndexPath *indexPath) {
    ListingCollectionViewCell *cell = [self.collectionView cellForItemAtIndexPath:indexPath];
    Ch2DetailViewController *detailViewController = [[Ch2DetailViewController alloc] init];
    detailViewController.image = cell.imageView.image;
    NSDictionary *data = self.data[indexPath.row];
    detailViewController.title = data[@"title"];
    detailViewController.price = [NSString stringWithFormat:@"$%@", data[@"currentPrice"]];

    [self rac_liftSelector:@selector(presentViewController:animated:completion:) withSignalsFromArray:@[
                                                                                               [RACSignal return:detailViewController],
                                                                                               [RACSignal return:@YES],[RACSignal return:nil],
                                                                                               ]
     ];
}] ;

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