cs193p – Assignment #4 Task #6

Please note, this blog entry is from a previous course. You might want to check out the current one.

When a photo first appears, and as the bounds of the UIScrollView showing a photo change (due to, for example, autorotation), you must adjust the zooming to show as much of the photo as possible with no extra, unused space. Once the user starts pinching to zoom on a given photo, you can stop doing this automatic zooming while that photo continues to be visible.

Like described in lecture #9 viewDidLayoutSubviews is for such occasions the proper place. First calculate which scale would be needed to either show the complete width, or the complete height of the photo. Then pick the higher one because the smaller one would show unused space:

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];
    double wScale = self.scrollView.bounds.size.width / self.imageView.image.size.width;
    double hScale = self.scrollView.bounds.size.height / self.imageView.image.size.height;
    if (wScale > hScale) self.scrollView.zoomScale = wScale;
    else self.scrollView.zoomScale = hScale;
}

The complete code is available on github.

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cs193p – Assignment #4 Task #5

Please note, this blog entry is from a previous course. You might want to check out the current one.

When the user then chooses a particular photo from the list, display it inside a UIScrollView that allows the user to pan and zoom.

Like in the previous task, you can safe some time be reusing code from Shutterbug.

In storyboard drag out a new view controller. Create a new subclass for it and link them. Add a scroll view and provide an outlet for it in the new class:

@property (weak, nonatomic) IBOutlet UIScrollView *scrollView;

Create a push segue from the cell of the second table to the new view controller and set its identifier to “Show Image”:
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cs193p – Assignment #4 Task #4

Please note, this blog entry is from a previous course. You might want to check out the current one.

When the user chooses one of the tags in the list, navigate to a new list of the titles of all the photos (in the data you queried originally with stanfordPhotos) that have that tag. The subtitles in this list should be the photo’s description (if it has one).

This task is similar to the previous one (and you could safe some time by reusing the code from shutterbug).

Create a new table-view-controller sub class. As model use an array to hold the photos – note, this time it has to be public, as the other view controller needs to set it.

@property (nonatomic, strong) NSArray *photos; // of NSDictionary

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cs193p – Assignment #4 Task #3 & #7

Please note, this blog entry is from a previous course. You might want to check out the current one.

The main (non-Recents) tab must present a list containing all of the tags (FLICKR_TAGS) on all of the photos queried except the tags “cs193pspot,” “portrait” & “landscape” (note that Flickr tags come back all lower case with no special characters). The subtitle for each cell in this list should display how many photos have the corresponding tag. Capitalize the tags so they look a bit nicer in the list.

All lists should each be displayed in a UITableView.

Create a new UITableViewController sub class. The model of the controller needs two properties. An array to store the photos received from Flickr and a dictionary where those photos are sorted by its tags:

@property (nonatomic, strong) NSArray *photos; // of NSDictionary
@property (nonatomic, strong) NSDictionary *photosByTag; // of NSArray of NSDictionary

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cs193p – Assignment #4 Task #2

Please note, this blog entry is from a previous course. You might want to check out the current one.

Your user-interface should present a UITabBarController-based UI with two tabs, each of which contains its own navigation (i.e. UINavigationController-based) stack. One tab lets you browse (in the manner described below) all of the photos returned in the above query and another which maintains a list of the photos the user has most recently viewed in your application.

In storyboard (currently we stay with the iPhone and ignore the iPad) use the “embed-in” functionality to add a navigation view controller. Copy both view controllers. Use the “embed-in” functionality to add a tab view controller. Connect the tab view controller also to the second navigation view controller. Name and set icons accordingly:

cs193p - assignment #4 task #2
cs193p – assignment #4 task #2

The complete code is available on github.

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cs193p – Assignment #4 Task #1

Please note, this blog entry is from a previous course. You might want to check out the current one.

You will be using the method stanfordPhotos in the provided FlickrFetcher helper code to get an NSArray of Flickr photos of various sites on the Stanford campus. Each entry in the NSArray is an NSDictionary object with numerous entries which describe the photo (more on this below). FlickrFetcher.h has #defines for the keys.

Create a new single-view project. Because the we know already that it should also run on iPads in the near future (extra task #2 or next assignment) make it universal. Add the Flickr-API to the project by dragging in the provided files (or get them from Shutterbug). Get the API key directly from Flickr and set it in FlickrAPIKey.h.

For now – we will not use it later on – add some test code to the automatically generated view controller to see if the interface to Flickr works.

#import "FlickrFetcher.h"
...
- (void)viewDidLoad
{
    [super viewDidLoad];
    NSLog(@"%@", [FlickrFetcher stanfordPhotos]);
}

The complete code is available on github.

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cs106a – Assignment #4 – Task #3

The complete specification of assignment #4 can be found as part of the stream at iTunes.

Reading the lexicon from a data file

Part III of this assignment is by far the easiest and requires considerably less than half a page of code.
Your job in this part of the assignment is simply to reimplement the HangmanLexicon class so that instead of selecting from a meager list of ten words, it reads a much larger word list from a file. The steps involved in this part of the assignment are as follows:

  1. Open the data file HangmanLexicon.txt using a BufferedReader that will allow you to read it line by line.
  2. Read the lines from the file into an ArrayList.
  3. Reimplement the getWordCount and getWord methods in HangmanLexicon so that

they use the ArrayList from step 2 as the source of the words.
The first two steps should be done in a constructor for HangmanLexicon, which you will need to add to the file. The last step is simply a matter of changing the implementation of the methods that are already there.
Here is how the HangmanLexicon constructor should be added to the HangmanLexicon class:
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