项目使用了Cocoapods，又设置了忽略文件，所以下载的时候请自行 pod install 一下
项目主要利用CATransform3DRotate改变view的perspective来实现骰子的3D旋转功能，再进行随机数来达到摇骰子的功能
因为使用了毛玻璃，所以在模拟器的情况下会崩溃，建议真机运行，或者将毛玻璃效果(全局搜索maoboli)屏蔽即可
先附上效果图(使用liceape制作的gif，gif效果没有实际的好):
首先，一个骰子为一个View，分别set 6张图片，然后分别设置对应的的CATransform3D
eg:
- (UIView *)view1
{
if (!_view1) {
_view1 = [[UIView alloc]init];
UIImageView *img = [[UIImageView alloc]init];
[img setImage:[UIImage imageNamed:@"one"]];
img.layer.allowsEdgeAntialiasing = true;
[_view1 addSubview:img];
[img mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.left.mas_equalTo(0.3);
make.bottom.right.mas_equalTo(-0.3);
}];
_view1.layer.borderWidth = 1;
_view1.layer.borderColor = [UIColor lightGrayColor].CGColor;
_view1.layer.cornerRadius = 3;
}
return _view1;
}
[self addSubview:self.view1];
[self.view1 mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.right.top.bottom.mas_equalTo(0);
}];
CATransform3D viewTrans = CATransform3DIdentity;
viewTrans = CATransform3DRotate(view2Trans, M_PI_2, 0, 1, 0);
viewTrans = CATransform3DTranslate(view2Trans, theWidth/2, 0, -theWidth/2);
self.view1.layer.transform = viewTrans;
最重要的，记得吧骰子所在的view的M34属性设置一下，才能看到3D效果
CATransform3D perspective = CATransform3DIdentity;
perspective.m34 = -1.0/500.0;
self.layer.sublayerTransform = perspective;
在controller初始化骰子所在的view（diceview）的时候，记得设置一下3d角度，便于观察
CATransform3D perspective1 = CATransform3DIdentity;
perspective1.m34 = -1/500;
perspective1 = CATransform3DRotate(perspective1, -M_PI_4 + M_PI_2, 1, 0, 0);
perspective1 = CATransform3DRotate(perspective1, -M_PI_4, 0, 0, 1);
perspective1 = CATransform3DTranslate(perspective1, 0, 0, 25);
self.diceView.layer.sublayerTransform = perspective1;
然后点击的时候，创建了一个timer，让CATransform3DRotate改变，从而达到骰子3D翻转的效果
- (void)timerAction
{
self.theNum += 0.35;
CATransform3D perspective = CATransform3DIdentity;
perspective.m34 = -1.0/500.0;
perspective = CATransform3DRotate(perspective, self.theNum, 1, 0, 0);
perspective = CATransform3DRotate(perspective, self.theNum, 0, 1, 0);
perspective = CATransform3DRotate(perspective, self.theNum, 0, 0, 1);
perspective = CATransform3DTranslate(perspective, 0, 0, 25);
self.diceView.layer.sublayerTransform = perspective;
}
再次点击的时候创建先停止之前的timer，然后做另外一个timer的Action，一开始脑子没转过来，总是想着让骰子摇到特定的角度，后来思路一通，先是用随机数随机出一个数，然后再让骰子做动画听到那个点数
- (void)timer2Action
{
self.Num1 = self.Num1 - 0.025;
if (self.Num1 > 0) {
CATransform3D perspective = CATransform3DIdentity;
perspective.m34 = -1.0/500.0;
switch (self.onPoint) {
case 0:
{
// 1 的情况
perspective = CATransform3DRotate(perspective, -M_PI_4 + M_PI_2 - self.Num1, 1, 0, 0);
perspective = CATransform3DRotate(perspective, -self.Num1 , 0, 1, 0);
perspective = CATransform3DRotate(perspective, M_PI_4 + M_PI_2 * self.roundPoint -self.Num1, 0, 0, 1);
}
break;
case 1:
{
// 2 的情况
perspective = CATransform3DRotate(perspective, -M_PI_4 - self.Num1, 1, 0, 0);
perspective = CATransform3DRotate(perspective, -M_PI_4 + M_PI_2 * self.roundPoint - self.Num1, 0, 1, 0);
perspective = CATransform3DRotate(perspective, M_PI_2 - self.Num1, 0, 0, 1);
}
break;
case 2:
{
// 3 的情况
perspective = CATransform3DRotate(perspective, -M_PI_4 + M_PI_2 * 2 - self.Num1, 1, 0, 0);
perspective = CATransform3DRotate(perspective, -M_PI_4 - self.Num1 + M_PI_2 * self.roundPoint, 0, 1, 0);
perspective = CATransform3DRotate(perspective, - self.Num1, 0, 0, 1);
}
break;
case 3:
{
// 4 的情况
perspective = CATransform3DRotate(perspective, -M_PI_4 - self.Num1, 1, 0, 0);
perspective = CATransform3DRotate(perspective, -M_PI_4 - self.Num1 + M_PI_2 * self.roundPoint, 0, 1, 0);
perspective = CATransform3DRotate(perspective, - self.Num1, 0, 0, 1);
}
break;
case 4:
{
// 5 的情况
perspective = CATransform3DRotate(perspective, -M_PI_4 - self.Num1, 1, 0, 0);
perspective = CATransform3DRotate(perspective, -M_PI_4 + M_PI_2 * self.roundPoint - self.Num1, 0, 1, 0);
perspective = CATransform3DRotate(perspective, -M_PI_2 - self.Num1, 0, 0, 1);
}
break;
case 5:
{
// 6 的情况
perspective = CATransform3DRotate(perspective, -M_PI_4 - M_PI_2 - self.Num1, 1, 0, 0);
perspective = CATransform3DRotate(perspective, -self.Num1 , 0, 1, 0);
perspective = CATransform3DRotate(perspective, M_PI_4 + M_PI_2 * self.roundPoint -self.Num1, 0, 0, 1);
}
break;
default:
break;
}
perspective = CATransform3DTranslate(perspective, 0, 0, 25 );
self.diceView.layer.sublayerTransform = perspective;
}else{
[self.timer2 setFireDate:[NSDate distantFuture]];
self.thetag = 0;
}
}
最后有多个骰子存在的情况下，加了动画改进，让5个骰子做旋转动画，一开始想到的是用贝塞尔曲线实现，后来尝试 了一下利用CATransform3DRotate只改变Z的数值，发现这种方法也可行，然后再加上一个坐标往center的动画，效果出来就很炫酷了
- (void)timerAction
{
self.zTrans += M_PI_2*8/125;
self.theNum += 0.35;
CATransform3D perspective = CATransform3DIdentity;
perspective.m34 = -1.0/500.0;
perspective = CATransform3DRotate(perspective, self.theNum, 1, 0, 0);
perspective = CATransform3DRotate(perspective, self.theNum, 0, 1, 0);
perspective = CATransform3DRotate(perspective, self.theNum, 0, 0, 1);
perspective = CATransform3DTranslate(perspective, 0, 0, 25);
self.diceView.layer.sublayerTransform = perspective;
self.diceView1.layer.sublayerTransform = perspective;
self.diceView2.layer.sublayerTransform = perspective;
self.diceView3.layer.sublayerTransform = perspective;
self.diceView4.layer.sublayerTransform = perspective;
CATransform3D perspective1 = CATransform3DIdentity;
perspective1 = CATransform3DRotate(perspective1, self.zTrans, 0, 0, 1);
self.layer.sublayerTransform = perspective1;
}
具体的知识点可以参考 《核心动画高级技巧》
附上网址：https://www.gitbook.com/book/zsisme/ios-/details