Objective-C @objectivec_

Beginners tidbits on Objective-C (mostly from Big Nerd Ranch & other resources) Joined July 2014

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Objective-C @objectivec_

11 years ago

Foundation vs Core Foundation. E.g.: NSArray vs CFArrayRef Foundation: Objective-C Core Foundation: C

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Objective-C @objectivec_

11 years ago

UIMotionEffect in iOS ... medium.com/@feelgifted/ui…

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Objective-C @objectivec_

11 years ago

Obj-c : “instancetype” vs “id” medium.com/@feelgifted/ob…

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Objective-C @objectivec_

11 years ago

device orientation : as name suggests is the orientation of the physical device. interface orientation: is the property of running app.

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Objective-C @objectivec_

11 years ago

There are 2 distinct orientations in iOS, 1. device orientation 2. interface orientation

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Objective-C @objectivec_

11 years ago

UILongPressGestureRecognizer: a touch must be held 0.5 seconds (default value) to become a long press. You can override this.

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Objective-C @objectivec_

11 years ago

There is only one UIMenuController per application.

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Objective-C @objectivec_

11 years ago

UIBarButtonItem is not a subclass of UIView.

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Objective-C @objectivec_

11 years ago

UINavigationItem has 3 customizable areas 1. leftBarButtonItem (a UIBarButtonItem) 2. rightBarButtonItem(a UIBarButtonItem) 3. titleView

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Objective-C @objectivec_

11 years ago

UINavigationItem has 3 customizable areas 1. leftBarButtonItem 2. rightBarButtonItem 3. titleView

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Objective-C @objectivec_

11 years ago

UIViewController sets the UINavigationItem. UINavigationController's UINavigationBar uses the UINavigationItem to show the title.

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Objective-C @objectivec_

11 years ago

UINavigationItem is not a subclass of UIView, so it cannot appear on the screen by itself.

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Objective-C @objectivec_

11 years ago

UIViewController has a navigationItem property of type UINavigationItem.

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Objective-C @objectivec_

11 years ago

UITableViewCell's contentView has 3 subviews. 1. UILabel textLabel 2. UILabel detailTextLabel 3. UIImageView imageView

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Objective-C @objectivec_

11 years ago

Each row in a UITableView view is a UITableViewCell view. And UITableViewCell has a subview called contentView.

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Objective-C @objectivec_

11 years ago

when UITableViewController create its view, the dataSource, delegate ivars of the UITableView are automatically set to UITableViewController

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Objective-C @objectivec_

11 years ago

UITableViewController is a subclass of UIViewController, so a UITableViewController has a view, which is instance of UITableView.

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Objective-C @objectivec_

11 years ago

UITableViewController is subclass of UIViewController UITableViewController : UIViewController<UITableViewDelegate, UITableViewDataSource>

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Objective-C @objectivec_

11 years ago

Instance of UITableViewController can fill all 3 roles: 1. view controller 2. data source 3. delegate

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Objective-C @objectivec_

11 years ago

UITableView needs a 1. view controller 2. data source 3. delegate

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