// Controller.h
// Controller class for the Favorite Twitter Searches app.
#import
// constants that control the height of the buttons and the spacing
#define BUTTON_SPACING 10
#define BUTTON_HEIGHT 40
@interface Controller : NSObject // this line is autogenerated
{
// Interface Builder outlets
IBOutlet UIScrollView *scrollView; // for scrollable favorites
IBOutlet UITextField *tagField; // text field for entering tag
IBOutlet UITextField *queryField; // text field for entering query
// stores the tag names and searches
NSMutableDictionary *tags;
// stores the Buttons representing the searches
NSMutableArray *buttons;
// stores the info buttons for editing existing searches
NSMutableArray *infoButtons;
// location of the file in which favorites are stored
NSString *filePath;
} // end instance variable declarations
- (IBAction)addTag:sender; // adds a new tag
- (IBAction)clearTags:sender; // clears all of the tags
- (void)addNewButtonWithTitle:(NSString *)title; // creates a new button
- (void)refreshList; // refreshes the list of buttons
- (void)buttonTouched:sender; // handles favorite button event
- (void)infoButtonTouched:sender; // handles info button event
@end // end Controller interface
// begin UIButton's sorting category
@interface UIButton (sorting)
// compares this UIButton's title to the given UIButton's title
- (NSComparisonResult)compareButtonTitles:(UIButton *)button;
@end // end catagory sorting of interface UIButton
Controller.m
// Controller.m
// Controller class for the Favorite Twitter Searches app.
#import "Controller.h" //this line is auto-generated
@implementation Controller //this line is auto-generated
// called when object is initialized
- (id)init
{
self = [super init]; // initialize the superclass members
if (self != nil) // if the superclass initialized properly
{
// creates list of valid directories for saving a file
NSArray *paths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
// get the first directory
NSString *dir = [paths objectAtIndex:0];
// concatenate the file name "tagsIndex.plist" to the path
filePath = [[NSString alloc] initWithString:
[dir stringByAppendingPathComponent:@"tagsIndex.plist"]];
NSFileManager *fileManager = [NSFileManager defaultManager];
// if the file does not exist, create an empty NSMutableDictionary;
// otherwise, initialize an NSDictionary with the file's contents
if ([fileManager fileExistsAtPath:filePath] == NO)
{
tags = [[NSMutableDictionary alloc] init];
} // end if
else
{
tags = [[NSMutableDictionary alloc]
initWithContentsOfFile:filePath];
} // end else
buttons = [[NSMutableArray alloc] init]; // create array
infoButtons = [[NSMutableArray alloc] init]; // create array
} // end if
return self; // if self == nil, object not initialized properly
} // end method init
// called when the GUI components finish loading
- (void)awakeFromNib
{
for (NSString *title in tags)
[self addNewButtonWithTitle:title];
} // end method awakeFromNib
// remove all buttons and populate View with favorites
- (void)refreshList
{
// remove all the buttons from the GUI
for (UIButton *button in scrollView.subviews)
[button removeFromSuperview];
[infoButtons removeAllObjects];
float buttonOffset = BUTTON_SPACING; // reset the spacing
// repopulate the scroll view with buttons
for (UIButton *button in buttons)
{
CGRect buttonFrame = button.frame; // fetch the frame of button
buttonFrame.origin.x = BUTTON_SPACING; // set the x-coordinate
buttonFrame.origin.y = buttonOffset; // set the y-coordinate
// button width is the size of the view minus padding on each side
buttonFrame.size.width =
scrollView.frame.size.width - 5 * BUTTON_SPACING;
buttonFrame.size.height = BUTTON_HEIGHT; // set the height of button
button.frame = buttonFrame; // assign the new frame to button
[scrollView addSubview:button]; // add button as a subview
// create detail button
UIButton *infoButton =
[UIButton buttonWithType: UIButtonTypeDetailDisclosure];
[infoButtons addObject:infoButton]; // add infoButton to infoButtons
// position button to the right of the button we just added
buttonFrame = infoButton.frame; // fetch the frame of infoButton
buttonFrame.origin.x = scrollView.frame.size.width - 35;
// this button is a bit shorter than normal buttons, so we adjust
buttonFrame.origin.y = buttonOffset+3;
infoButton.frame = buttonFrame; // assign the new frame
// make the button call infoButtonTouched: when it is touched
[infoButton addTarget:self action:@selector(infoButtonTouched:)
forControlEvents:UIControlEventTouchUpInside];
[scrollView addSubview:infoButton]; // add infoButton as a subview
// increase the offset so the next button is added further down
buttonOffset += BUTTON_HEIGHT + BUTTON_SPACING;
} // end for
} // end refreshList
// called when the user touches an info button
- (void)infoButtonTouched:sender
{
// get the index of the button that was touched
int index = [infoButtons indexOfObject:sender];
// get the title of the button
NSString *key = [[buttons objectAtIndex:index] titleLabel].text;
tagField.text = key; // update tagField with the button title
// get the search query using the button title
NSString *value = [tags valueForKey:key];
queryField.text = value; // update queryField with the value
} // end method infoButtonTouched:
// add a favorite search
- (IBAction)addTag:sender
{
// make the keyboard disappear
[tagField resignFirstResponder];
[queryField resignFirstResponder];
NSString *key = tagField.text; // get the text in tagField
NSString *value = queryField.text; // get the text in queryField
// test if either field is empty
if (value.length == nil || key.length == nil)
return; // exit from the method
if ([tags valueForKey:key] == nil) // test if the tag already exists
[self addNewButtonWithTitle:key]; // if not, add a new button
[tags setValue:value forKey:key]; // add a new entry in tags
tagField.text = nil; // clear tagField of text
queryField.text = nil; // clear queryField of text
[tags writeToFile:filePath atomically:NO]; //save the data
} // end method addTag:
// remove all the tags
- (IBAction)clearTags:sender
{
[tags removeAllObjects]; // clear tags
[tags writeToFile:filePath atomically:NO]; // update favorite file
[buttons removeAllObjects]; // clear buttons
[self refreshList]; // update the display
} // end clearTags:
// add a new button with the given title to the bottom of the list
- (void)addNewButtonWithTitle:(NSString *)title
{
// create a new button
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
// give the button the title of the tag
[button setTitle:title forState:UIControlStateNormal];
// tell the button to call buttonTouched: when it is touched
[button addTarget:self action:@selector(buttonTouched:)
forControlEvents:UIControlEventTouchUpInside];
[buttons addObject:button]; // add the UIButton to the end of the array
// sort the NSMutableArray by the UIButton's titles
[buttons sortUsingSelector:@selector(compareButtonTitles:)];
[self refreshList]; // refresh the list of favorite search Buttons
// Adjust the content size of the view to include the new button. The
// view scrolls only when the content size is greater than its frame.
CGSize contentSize = CGSizeMake(scrollView.frame.size.width,
buttons.count * (BUTTON_HEIGHT + BUTTON_SPACING) + BUTTON_SPACING);
[scrollView setContentSize:contentSize];
} // end addNewButtonWithTitle:
// load selected search in web browser
- (void)buttonTouched:sender
{
NSString *key = [sender titleLabel].text; // get Button's text
// get the search and replace special characters with percent escapes
NSString *search = [[tags valueForKey:key]
stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
// format the URL
NSString *urlString = [NSString stringWithFormat:
@"http://search.twitter.com/search?q=%@", search];
NSURL *url = [NSURL URLWithString:urlString];
[[UIApplication sharedApplication] openURL:url];
} // end buttonTouched
@end // end implementation Controller
// define UIButton's sorting category method
@implementation UIButton (sorting)
- (NSComparisonResult)compareButtonTitles:(UIButton *)button
{
// compare this UIButton's title to that of the given UIButton
return [self.titleLabel.text
caseInsensitiveCompare:button.titleLabel.text];
} // end method compareButtonTitles
@end // end UIButtons's sorting category
