恋老福音,盐城国税,魅力研习社36期
一、需求：请实现下图所示的动画(物理碰撞)
二、上面引入过uidynamic 可以实现碰撞的物理效果动画，how to start ?
在工程中导入uikit，从headers 找一些uidynamic，发现了uidynamicanimator.h,uidynamicbehavior,uidynamicitembehavior
既然是要动画效果 那就应该是uidynamicanimator.h
到uidynamicanimator.h 头文件去查看注释
// when you initialize a dynamic animator with this method, you should only associates views with your behaviors. // the behaviors (and their dynamic items) that you add to the animator employ the reference view’s coordinate system. - (instancetype)initwithreferenceview:(uiview *)view ns_designated_initializer;
大概意思是使用这个初始化方法的时候，需要为你的试图关联behaviors
what’s the behaviors ? jump into defination 然而还不是很懂，uidynamicbehavior,那就查看api (注意文档中的如下描述)。
this parent class, uidynamicbehavior, is inherited by the primitive dynamic behavior classes uiattachmentbehavior, uicollisionbehavior, uigravitybehavior, uidynamicitembehavior, uipushbehavior, and uisnapbehavior.
文档中提到uidynamicbehavior的父类，那么uidynamicbehavior父类(dynamic 行为相关类)描述什么行为呢?
uiattachmentbehavior：附着行为
uicollisionbehavior：碰撞行为
uigravitybehavior：重力行为
uidynamicitembehavior：动态元素行为
uipushbehavior：推行为
uisnapbehavior：吸附行为
上述的各种行为可单独使用，也可以组合使用更复杂的动画效果。
解决方案的思路就引导到这边，也就可以实现上述需求。dynamic 行为相关类的属性可自行研究。
三、解决方案。
上述需求的解决方案(我这边用的是6sp的模拟器奥，因为在设置floor的y坐标是600)
既然是球落地效果，必然有两个模拟对象：floor，basketball
1.创建uidynamicanimator 对象
self.animator = [[uidynamicanimator alloc] initwithreferenceview:self.view];
2.刚刚在api 看到了初始化uidynamicanimator需要关联一个或者多个行为
nsarray *animatorobjects = @[self.imagev1]; // 刚刚在api 看到了初始化uidynamicanimator需要关联一个或者多个行为 self.gravitybehav = [[uigravitybehavior alloc] initwithitems:animatorobjects]; self.colision = [[uicollisionbehavior alloc] initwithitems:animatorobjects];
3.如果你想监听碰撞的状态，可以设置一下代理
self.colision.collisiondelegate = self;
4.设置碰撞边界
[self.colision addboundarywithidentifier:@"boundaryline" frompoint:cgpointmake(0, 600) topoint:cgpointmake(screenwith, 600)];
5.设置动态行为参数
// 设置动态行为参数 uidynamicitembehavior *itembehavior = [[uidynamicitembehavior alloc] initwithitems:animatorobjects]; // 设置弹性 [itembehavior setelasticity:0.5];
6.行为创建了，别忘了给animator添加上
[self.animator addbehavior:self.gravitybehav]; [self.animator addbehavior:self.colision]; [self.animator addbehavior:itembehavior];
三、下面代码只能说功能实现
ps：以下代码不符合代码书写规范
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//
// viewcontroller.m
// dynamicanimation
//
// created by jeversonjee on 16/5/27.
// copyright © 2016年 jeversonjee. all rights reserved.
//
#import "viewcontroller.h"
#define screenwith [uiscreen mainscreen].bounds.size.width
#define screenheight [uiscreen mainscreen].bounds.size.height
@interface viewcontroller ()
@property (nonatomic, strong) uidynamicanimator *animator;
@property (nonatomic, strong) uigravitybehavior *gravitybehav;
@property (nonatomic, strong) uicollisionbehavior *colision;
@property (nonatomic, strong) uiimageview *imagev1;
@property (nonatomic, strong) uiimageview *imagev2;
@end
@implementation viewcontroller
- (void)viewdidload {
[super viewdidload];
// do any additional setup after loading the view, typically from a nib.
[self jjcollisionbehav];
}
- (void)jjcollisionbehav {
// 创建碰撞需要的对象
[self jjcreateball];
[self jjcreatefloor];
// 创建uidynamicanimator 对象
self.animator = [[uidynamicanimator alloc] initwithreferenceview:self.view];
nsarray *animatorobjects = @[self.imagev1];
// 刚刚在api 看到了初始化uidynamicanimator需要关联一个或者多个行为
self.gravitybehav = [[uigravitybehavior alloc] initwithitems:animatorobjects];
self.colision = [[uicollisionbehavior alloc] initwithitems:animatorobjects];
// 这里设置代理是为了监听碰撞状态的，可以去了解一下代理方法
self.colision.collisiondelegate = self;
// 设置碰撞边界
[self.colision addboundarywithidentifier:@"boundaryline" frompoint:cgpointmake(0, 600) topoint:cgpointmake(screenwith, 600)];
// 设置动态行为参数
uidynamicitembehavior *itembehavior = [[uidynamicitembehavior alloc] initwithitems:animatorobjects];
// 设置弹性
[itembehavior setelasticity:0.5];
// 创建了行为需要animator添加
[self.animator addbehavior:self.gravitybehav];
[self.animator addbehavior:self.colision];
[self.animator addbehavior:itembehavior];
}
-(void)collisionbehavior:(uicollisionbehavior *)behavior endedcontactforitem:(id)item withboundaryidentifier:(id)identifier {
nslog(@"collisionbehavior=%@", item);
nsstring *identifierstr = [nsstring stringwithformat:@"%@", identifier];
nslog(@"s=%@", identifier);
if ( [identifierstr isequaltostring:@"boundaryline"] ) {
[self.imagev2 setbackgroundcolor:[uicolor graycolor]];
[uiview animatewithduration:2 animations:^(void){
[self.imagev2 setbackgroundcolor:[uicolor graycolor]];
}];
}
}
-(void)jjcreateball {
_imagev1 = [[uiimageview alloc] initwithimage:[uiimage imagenamed:@"basketball"]];
_imagev1.frame = cgrectmake(100, 100, 60, 60);
[self.view addsubview:_imagev1];
}
- (void)jjcreatefloor {
_imagev2 = [[uiimageview alloc] init];
[_imagev2 setbackgroundcolor:[uicolor graycolor]];
_imagev2.frame = cgrectmake(0, 600, screenwith, screenheight - 400);
[self.view addsubview:_imagev2];
}
-(void)didreceivememorywarning {
[super didreceivememorywarning];
// dispose of any resources that can be recreated.
}
@end
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