CS193P Lecture 7

Animation, Auto layout

Views

How to draw a custom image

Gestures

How to handle user gesture actions

Views

1, it is the basic building block, represents a rectangular area on the screen, defines a coordinate space, in this space can be drawn, you can add touch events;

2, it is hierarchical level, you can nest views in the view;

3, a view has only one parent view, but can have many sub-views, the view is a rectangle, can overlap;

4, UIWindow, all views are displayed in

Self.view.window

5. Commonly used initial templates

-(void) setup{...} -(void) awakefromnib{[self setup];} -(void) initWithFrame: (cgrect) arect{    = [Super Initwithframe:arect];    [Self setup];     return Self ;}

-The initialization operation is defined in the Setup method;

-then the first is to override the specified initialization method, in which the setup is called;

-Second, Setup needs to be called in awakefromnib, because awakefromnib is called when a UIView is released from storyboard;

CGFloat

A floating-point number used to represent the image size, coordinates

Cgpoint

CGFloat x, y;

Cgsize

CGFloat width, height;

CGRect

Cgpoint origin; Cgsize size;

Coordinate origin in upper- left corner

CS193P Lecture 7