Core Animation之CATransform3D学习篇

来源：互联网发布：c语言问号表达式编辑：程序博客网时间：2024/06/02 02:03

3D,顾名思义就是可以在z轴上动作，这里列举三个用例

//用例1 scale

CABasicAnimation *theAnimation = [CABasicAnimation animationWithKeyPath:@"transform"];

CATransform3D transform = CATransform3DMakeScale(0.5, 0.5, 1.0); //x,y,z放大缩小倍数

NSValue *value = [NSValue valueWithCATransform3D:transform];

[theAnimation setToValue:value];

transform = CATransform3DMakeScale(1.0, 1.0, 1.0);

value = [NSValue valueWithCATransform3D:transform];

[theAnimation setFromValue:value];

[theAnimation setAutoreverses:YES]; //原路返回的动画一遍

[theAnimation setDuration:1.0];

[theAnimation setRepeatCount:2];

[layer addAnimation:theAnimation forKey:nil];

//用例2 rotate

......

CATransform3D transform = CATransform3DMakeRotation(1.57, 1, 1, 0); //1.57表示所转角度的弧度 = 90Pi/180 = 90*3.14/180

NSValue *value = [NSValue valueWithCATransform3D:transform];

[theAnimation setToValue:value];

transform = CATransform3DMakeRotation(0, 1, 1, 0);

value = [NSValue valueWithCATransform3D:transform];

[theAnimation setFromValue:value];

......

//用例3 scale+rotate+position

CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform"];

CATransform3D rotateTransform = CATransform3DMakeRotation(1.57, 0, 0, -1);

CATransform3D scaleTransform = CATransform3DMakeScale(5, 5, 5);

CATransform3D positionTransform = CATransform3DMakeTranslation(0, 0, 0);//位置移动

CATransform3D combinedTransform = CATransform3DConcat(rotateTransform, scaleTransform); //Concat就是combine的意思

combinedTransform = CATransform3DConcat(combinedTransform, positionTransform);//再combine一次把三个动作连起来

[anim setFromValue:[NSValue valueWithCATransform3D:CATransform3DIdentity]]; //放在3D坐标系中最正的位置

[anim setToValue:[NSValue valueWithCATransform3D:combinedTransform]];

[anim setDuration:5.0f];

[layer addAnimation:anim forKey:nil];

[layer setTransform:combinedTransform]; //如果没有这句，layer执行完动画又会返回最初的state

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