Objective-C Introduction part2

Transcript

1. Objective-C & Cocoa viernes 23 de marzo de 12
2. Blocks • Typed argument list just like a function • Can capture state from the lexical scope within which it is defined • Can optionally modify the state of the lexical scope • Can share the potential for modification with other blocks defined within the same viernes 23 de marzo de 12
3. Blocks viernes 23 de marzo de 12
4. Blocks viernes 23 de marzo de 12
5. MVC viernes 23 de marzo de 12
6. Views • Represent a rectangular area • Draws and handles events • Hierarchical • Ordered as they’re added viernes 23 de marzo de 12
7. Views Frame • Rectangle • CGPoint = {0.0f, 0.0f} • CGSize = {100.0f, 100.0f} • CGRect = {0.0f, 0.0f, 100.0f, 100.0f} viernes 23 de marzo de 12
8. Views order viernes 23 de marzo de 12
9. Views transparency • Can do, but is expensive (composites) • Opaque is your friend viernes 23 de marzo de 12
10. Views memory management • A parent retains it’s subviews • Released when removeFromSuperView viernes 23 de marzo de 12
11. View Controllers • View based applications.. so most of them • Could use a nib, but not required viernes 23 de marzo de 12
12. View Controllers viernes 23 de marzo de 12
13. View Controllers • UINavigationController • UITabBarController • UISplitViewController viernes 23 de marzo de 12
14. UIGestureRecognizer • Touches! • 1. Assign gesture recognizer to a view. • 2. Handle event for gesture • 3. Profit viernes 23 de marzo de 12
15. UIGestureRecognizer viernes 23 de marzo de 12