Learn Cocoa Touch for iOS by Jeff Kelley PDF

By Jeff Kelley

ISBN-10: 1430242698

ISBN-13: 9781430242697

The Cocoa contact frameworks and APIs are robust instruments for developing local iOS apps, and they are unfastened with Xcode, Apple's improvement setting. If you have got already gotten your toes rainy with Objective-C, and you are prepared to benefit extra approximately iOS improvement, then examine Cocoa contact for iOS is the booklet for you. research Cocoa contact for iOS exhibits you ways to exploit frameworks like MapKit, Twitter, and MediaPlayer. you will additionally find out about APIs so that you can get the main from your accelerometer, digicam, and extra. you are going to even know about extra complicated positive factors like Grand critical Dispatch.

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Extra resources for Learn Cocoa Touch for iOS

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Info 55 56 CHAPTER 3: Managing On-Screen Content with View Controllers the fact that the loadNibName:owner:options: method returns an NSArray of the top-level objects in the nib: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CellIdentifier"]; if (cell == nil) { NSArray *nibObjects = [[NSBundle mainBundle] loadNibNamed:@"MyCellNib" owner:nil options:nil]; } } cell = [nibObjects objectAtIndex:0]; return cell; This method relies on the cell being the only object in the nib, but it doesn’t use any sleight of hand with outlets like the former method.

The naming convention is to capitalize the first letter and to use camelCase throughout. Next, we use @required to indicate that any methods following must be implemented by objects that conform to the WorkerDelegate protocol. You can also use @optional to signify methods that are declared but do not need to be implemented. Methods are now declared as optional by default, which wasn’t always an option. Because of that prior limitation, some older classes use ‘‘informal protocols,’’ which aren’t protocols in the language sense of the word.

One solution is a search bar at the top of the table view that narrows the list of content to that which matches the user’s search term. Another is to separate the content into letters, such as sorting a list of people by last name and then to allow the user to tap a letter on the right margin of the table view to jump to that letter’s section. To accomplish this, provide an array of letters in the data source’s sectionIndexTitlesForTableView: method, and specify which titles correspond to which sections in the tableView:sectionForSectionIndexTitle: method.

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Learn Cocoa Touch for iOS by Jeff Kelley


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