Beginning i os part 2 sam kirchmeier
1 like577 views
This document summarizes an iOS training session on storyboards, navigation controllers, and table view controllers. It provides code samples and instructions for displaying a list of sessions using a table view, and fetching and displaying a Twitter feed. The training covers core iOS concepts like view controllers, navigation, JSON parsing, and threading to update the UI.
![Segues
Old Way
- (IBAction)showAboutView:(id)sender
{
// Use presentModalViewController to
// display the view controller.
}
New Way
- (void)prepareForSegue:(UIStoryboardSegue *)segue
sender:(id)sender
{
// Grab a reference to the view controller via
// [segue destinationViewController].
}
Tuesday, March 20, 2012](https://image.slidesharecdn.com/beginningiospart2-samkirchmeier-120320195506-phpapp01/85/Beginning-i-os-part-2-sam-kirchmeier-11-320.jpg)
![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;
}
Tuesday, March 20, 2012](https://image.slidesharecdn.com/beginningiospart2-samkirchmeier-120320195506-phpapp01/85/Beginning-i-os-part-2-sam-kirchmeier-33-320.jpg)
![TWRequest
TWRequest *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.
}];
Tuesday, March 20, 2012](https://image.slidesharecdn.com/beginningiospart2-samkirchmeier-120320195506-phpapp01/85/Beginning-i-os-part-2-sam-kirchmeier-43-320.jpg)
![Request Handler Block
^(NSData *responseData,
NSHTTPURLResponse *urlResponse,
NSError *error)
{
// Invoked after the response is complete.
// Parse response and display tweets.
}
[request performRequestWithHandler: Request Handler Block ];
Tuesday, March 20, 2012](https://image.slidesharecdn.com/beginningiospart2-samkirchmeier-120320195506-phpapp01/85/Beginning-i-os-part-2-sam-kirchmeier-44-320.jpg)
![Threads
[request performRequestWithHandler: Request Handler Block ];
This handler is
not guaranteed
to be called on
any particular
thread.
Apple
Tuesday, March 20, 2012](https://image.slidesharecdn.com/beginningiospart2-samkirchmeier-120320195506-phpapp01/85/Beginning-i-os-part-2-sam-kirchmeier-45-320.jpg)
![Danger
Request Handler Block
^(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];
}
Tuesday, March 20, 2012](https://image.slidesharecdn.com/beginningiospart2-samkirchmeier-120320195506-phpapp01/85/Beginning-i-os-part-2-sam-kirchmeier-46-320.jpg)
![OK
Request Handler Block
^(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];
}
Tuesday, March 20, 2012](https://image.slidesharecdn.com/beginningiospart2-samkirchmeier-120320195506-phpapp01/85/Beginning-i-os-part-2-sam-kirchmeier-47-320.jpg)
![Twitter Response
NSData
[NSJSONSerialization
JSONObjectWithData: Twitter Response NSData
options:0
error:&error];
Twitter Response
NSDictionary
Tuesday, March 20, 2012](https://image.slidesharecdn.com/beginningiospart2-samkirchmeier-120320195506-phpapp01/85/Beginning-i-os-part-2-sam-kirchmeier-49-320.jpg)
Beginning i os part 2 sam kirchmeier
- 1. iOS Training Part 2 Sam Kirchmeier sam@livefront.com @skirchmeier Tuesday, March 20, 2012
- 2. Getting Started •MobileMarch_Part_2_Start •https://github.com/skirchmeier/ mobilemarch-2012-ios Tuesday, March 20, 2012
- 3. •MobileMarch_Part_2_Start •https://github.com/skirchmeier/ mobilemarch-2012-ios Tuesday, March 20, 2012
- 4. Topics •Storyboards •Navigation Controllers •Table View Controllers Tuesday, March 20, 2012
- 5. Goals 1. Display a list of tomorrow’s sessions 2. Display a live Twitter feed 3. Bask in the glory of our iOS prowess Tuesday, March 20, 2012
- 6. Storyboards Tuesday, March 20, 2012
- 7. Scenes View Controllers Segues Transitions Tuesday, March 20, 2012
- 8. Tuesday, March 20, 2012
- 9. Scene Tuesday, March 20, 2012
- 10. Segue Scene Tuesday, March 20, 2012
- 11. Segues Old Way - (IBAction)showAboutView:(id)sender { // Use presentModalViewController to // display the view controller. } New Way - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { // Grab a reference to the view controller via // [segue destinationViewController]. } Tuesday, March 20, 2012
- 12. Demo Tuesday, March 20, 2012
- 13. Goal #1 Display a list of sessions Tuesday, March 20, 2012
- 14. Navigation Controller Tuesday, March 20, 2012
- 15. Tuesday, March 20, 2012
- 16. Tuesday, March 20, 2012
- 17. View Controller 1 View Controller 2 Tuesday, March 20, 2012
- 18. Demo Tuesday, March 20, 2012
- 19. Table View Controller Tuesday, March 20, 2012
- 20. Tuesday, March 20, 2012
- 21. Tuesday, March 20, 2012
- 22. Navigation Controller Tuesday, March 20, 2012
- 23. Navigation Controller View Controller Tuesday, March 20, 2012
- 24. Navigation Controller View Controller Table View Tuesday, March 20, 2012
- 25. Navigation Controller Navigation Controller View Controller Table View Controller Table View Table View Built In Tuesday, March 20, 2012
- 26. Navigation Controller View Controller Table View Tuesday, March 20, 2012
- 27. Navigation Controller View Controller Table View Data Source Delegate Tuesday, March 20, 2012
- 28. Navigation Controller View Controller Table View Data Source Object Number of rows Data Source Number of sections Data to display in each row Delegate Tuesday, March 20, 2012
- 29. Navigation Controller View Controller Table View Data Source Object Number of rows Data Source Number of sections Data to display in each row Delegate Object Handle touch events Delegate Header and footer views Rearrange rows Tuesday, March 20, 2012
- 30. Navigation Controller View Controller UITableViewDataSource Table View Data Source Object Number of rows Data Source Number of sections Data to display in each row UITableViewDelegate Delegate Object Handle touch events Delegate Header and footer views Rearrange rows Tuesday, March 20, 2012
- 31. Navigation Controller Table View Controller Table View Built In Tuesday, March 20, 2012
- 32. Navigation Controller Table View Controller Table View Built In Data Source Delegate Tuesday, March 20, 2012
- 33. 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; } Tuesday, March 20, 2012
- 34. UITableViewDelegate – tableView:didSelectRowAtIndexPath: – tableView:heightForRowAtIndexPath: – tableView:viewForHeaderInSection: – tableView:viewForFooterInSection: (and lots more) Tuesday, March 20, 2012
- 35. UITableViewCell Tuesday, March 20, 2012
- 36. Basic Tuesday, March 20, 2012
- 37. Right Detail Tuesday, March 20, 2012
- 38. Left Detail Tuesday, March 20, 2012
- 39. Subtitle Tuesday, March 20, 2012
- 40. Demo Tuesday, March 20, 2012
- 41. Goal #2 Display a Twitter feed Tuesday, March 20, 2012
- 42. Twitter Framework Tuesday, March 20, 2012
- 43. TWRequest TWRequest *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. }]; Tuesday, March 20, 2012
- 44. Request Handler Block ^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) { // Invoked after the response is complete. // Parse response and display tweets. } [request performRequestWithHandler: Request Handler Block ]; Tuesday, March 20, 2012
- 45. Threads [request performRequestWithHandler: Request Handler Block ]; This handler is not guaranteed to be called on any particular thread. Apple Tuesday, March 20, 2012
- 46. Danger Request Handler Block ^(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]; } Tuesday, March 20, 2012
- 47. OK Request Handler Block ^(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]; } Tuesday, March 20, 2012
- 48. JSON Twitter Request GET http://search.twitter.com/search.json Twitter Response { "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: ...", ... Tuesday, March 20, 2012
- 49. Twitter Response NSData [NSJSONSerialization JSONObjectWithData: Twitter Response NSData options:0 error:&error]; Twitter Response NSDictionary Tuesday, March 20, 2012
- 50. Demo Tuesday, March 20, 2012
- 51. Next Steps •Start your own app! •Apple’s Getting Started Guide •Apple’s Sample Code •WWDC Videos Tuesday, March 20, 2012
- 52. #prowess Sam Kirchmeier, Livefront @skirchmeier Bob McCune, TapHarmonic @bobmccune Tuesday, March 20, 2012