"iOS Dev-112" uidynamic physical simulations such as gravity behavior, collision behavior, collision behavior, and other

(1) The uidynammic use is divided into three steps:

--Create an emulator (by the way define the simulation scope) (lazy load definition available)

--Create simulation behavior (by adding simulation elements by the way)

--Add simulation behavior to the emulator

(2) Here are examples of the combination of gravity behavior and collision behavior

#import "ViewController.h" @interface Viewcontroller () @property (weak, nonatomic) Iboutlet UIView *rectview; @property ( Nonatomic,strong) Uidynamicanimator *ani; @property (weak, nonatomic) Iboutlet UIView *blueview; @end @implementation viewcontroller-(Uidynamicanimator *) ani{if (!_ani) {//Create emulator (by the way define simulation range) _ani=[[uidynamicanimator Alloc]in    ItWithReferenceView:self.view]; } return _ani;} -(void) viewdidload {[Super viewdidload];} Blueview only participates in collision simulation, not in the simulation of gravity drop-(void) touchesended: (Nsset *) touches withevent: (uievent *) event{//Create emulator (by the way, define the simulation range),    //uidynamicanimator *ani=[[uidynamicanimator Alloc]initwithreferenceview:self.view] in lazy loading;    Create simulation behavior (incidentally add simulation elements) Uigravitybehavior *behave=[[uigravitybehavior Alloc]initwithitems:@[self.rectview]];    Define direction Behave.gravitydirection=cgvectormake (1, 1) according to vectors;    Define direction//behave.angle=-m_pi_4 by angle;            Defines the gravitational acceleration behave.magnitude=1; Collision detection, set the simulation range to the boundary Uicollisionbehavior *collisionbehave=[[uicollisionbehavior Alloc]initwithitems:@[self.rectview,self.blueview]];        Collisionbehave.translatesreferenceboundsintoboundary=yes;    The simulation behavior is added to the emulator [Self.ani Addbehavior:behave]; [Self.ani Addbehavior:collisionbehave];} @end

--3 important properties of gravity behavior, two directional attributesgravitydirectionAndAngle, an acceleration attributemagnitude。

The more important properties of collisions are the several ways to define boundaries.

such as the translatesreferenceboundsintoboundary property above. There are two other main types of:

    Collision detection, set the simulation range to the boundary    Uicollisionbehavior *collisionbehave=[[uicollisionbehavior alloc]initwithitems:@[ Self.rectview,self.blueview]];    Collisionbehave.translatesreferenceboundsintoboundary=yes;    Add a left and right oblique line as the collision boundary    [Collisionbehave addboundarywithidentifier:@ "lines" frompoint:cgpointmake (0) Topoint: Cgpointmake (+ +)];    Add a circle to do the border    uibezierpath *path=[uibezierpath bezierpathwithovalinrect:cgrectmake (0, 0, (), +)];    [Collisionbehave addboundarywithidentifier:@ "Circle" Forpath:path];

(3) Snapping behavior, the main property is the damping property damping.

#import "ViewController.h" @interface Viewcontroller () @property (weak, nonatomic) Iboutlet UIView *pinkview; @property ( Nonatomic,strong) Uidynamicanimator *ani, @end @implementation viewcontroller-(uidynamicanimator *) ani{    if (_ani= =nil) {        _ani=[[uidynamicanimator alloc]initwithreferenceview:self.view];    }    return _ani;} -(void) viewdidload {    [Super viewdidload];} -(void) touchesended: (Nsset *) touches withevent: (uievent *) event{    uitouch *touch=[touches anyobject];    Cgpoint Point=[touch LocationInView:touch.view];    Create snapping behavior    uisnapbehavior *snap=[[uisnapbehavior alloc]initwithitem:self.pinkview snaptopoint:point];    Set snapping properties    //Damping settings, 0~1, the larger the value, the better the damping, the smaller the vibration amplitude.    snap.damping=0.5;    Delete all behaviors (to ensure that each click is valid, or the second time after the click, no response)    [Self.ani removeallbehaviors];    Add Behavior    [Self.ani Addbehavior:snap];}

(4) In addition to the above 3 acts, there are other acts:

--uipushbehavior: Driving behavior

--uiattachmentbehavior: Adhesion behavior

--uidynamicitembehavior: Dynamic Elemental Behavior

"iOS Dev-112" uidynamic physical simulations such as gravity behavior, collision behavior, collision behavior, and other