Beginning i os part 2 sam kirchmeier

iOS TrainingPart 2

Sam [email protected]

@skirchmeier

Tuesday, March 20, 2012

mailto:[email protected]

mailto:[email protected]

Getting Started

•MobileMarch_Part_2_Start

•https://github.com/skirchmeier/mobilemarch-2012-ios


https://github.com/skirchmeier/mobilemarch-2012-ios




•MobileMarch_Part_2_Start

•https://github.com/skirchmeier/mobilemarch-2012-ios






Topics

•Storyboards

•Navigation Controllers

•Table View Controllers


Goals

1. Display a list of tomorrow’s sessions

2. Display a live Twitter feed

3. Bask in the glory of our iOS prowess


Storyboards


ScenesView Controllers

SeguesTransitions



Scene


Scene

Segue


Segues- (IBAction)showAboutView:(id)sender{ // Use presentModalViewController to // display the view controller.}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{ // Grab a reference to the view controller via // [segue destinationViewController].}

Old Way

New Way


Demo


Goal #1Display a list of sessions


Navigation Controller




View Controller 1 View Controller 2


Demo


Table View Controller







View Controller



View Controller

Table View



View Controller

Table View



Table ViewBuilt In



View Controller

Table View



View Controller

Table View

Delegate

Data Source



View Controller

Table View

Delegate

Data SourceData Source Object

Number of rowsNumber of sections

Data to display in each row



View Controller

Table View

Delegate ObjectHandle touch events

Header and footer viewsRearrange rows

Delegate






View Controller

Table View

Delegate ObjectHandle touch events

Header and footer viewsRearrange rows

Delegate




UITableViewDataSource

UITableViewDelegate




Table ViewBuilt In




Table ViewBuilt In

Data Source

Delegate


UITableViewDataSource- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ // Return the number of rows here.}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

// Configure the cell here. return cell;}


UITableViewDelegate– tableView:didSelectRowAtIndexPath:

– tableView:heightForRowAtIndexPath:

– tableView:viewForHeaderInSection:

– tableView:viewForFooterInSection:

(and lots more)


UITableViewCell


Basic


Right Detail


Left Detail


Subtitle


Demo


Goal #2Display a Twitter feed


Twitter Framework


TWRequestTWRequest *request = [[TWRequest alloc] initWithURL:URL parameters:parameters requestMethod:TWRequestMethodGET];

[request performRequestWithHandler:^( NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error){ // Invoked after the response is complete. // Parse response and display tweets.}];


^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error){ // Invoked after the response is complete. // Parse response and display tweets.}

Request Handler Block

[request performRequestWithHandler: ];Request Handler Block


Threads[request performRequestWithHandler: ];Request Handler Block

This handler is not guaranteed to be called on any particular

thread.

Apple


Danger^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error){ // Parse the Twitter response. ...

// Assign an array of tweets to our tweets property. ...

// Reload the table view. // This might not work! [self.tableView reloadData];}



OK^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error){ // Parse the Twitter response. ...

// Assign an array of tweets to our tweets property. ...

// Reload the table view. This will work! [self.tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO];}



JSON

{ "completed_in": 0.108, "page": 1, "results_per_page": 100, "query": "%23mobilemarch+OR+%40mobilemarchtc", ... "results": [ { "created_at": "Thu, 15 Mar 2012 16:41:16 +0000", "from_user": "teruterubouzu", "text": "@mobilemarchtc How late ...", ... }, { "created_at": "Thu, 15 Mar 2012 14:20:49 +0000", "from_user": "billyspringer", "text": "RT @smbmsp: RT @philson: ...", ...

Twitter RequestGET http://search.twitter.com/search.json

Twitter Response


Twitter ResponseNSData

[NSJSONSerialization JSONObjectWithData: options:0 error:&error];

Twitter Response NSData

Twitter ResponseNSDictionary


Demo


Next Steps

•Start your own app!

•Apple’s Getting Started Guide

•Apple’s Sample Code

•WWDC Videos


http://tinyurl.com/6mymw72

http://tinyurl.com/6mymw72

https://developer.apple.com/videos/wwdc/2011/

https://developer.apple.com/videos/wwdc/2011/

#prowess

Sam Kirchmeier, Livefront@skirchmeier

Bob McCune, TapHarmonic@bobmccune


Technology

Beginning i os part 2 sam kirchmeier