ios渐变圆环旋转动画cashapelayer cagradientlayer
shape.gif
demo.png
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- (void)viewdidload {
[super viewdidload];
// do any additional setup after loading the view, typically from a nib.
calayer *layer = [calayer layer];
layer.backgroundcolor = [uicolor redcolor].cgcolor; //圆环底色
layer.frame = cgrectmake(100, 100, 110, 110);
//创建一个圆环
uibezierpath *bezierpath = [uibezierpath bezierpathwitharccenter:cgpointmake(55, 55) radius:50 startangle:0 endangle:m_pi*2 clockwise:yes];
//圆环遮罩
cashapelayer *shapelayer = [cashapelayer layer];
shapelayer.fillcolor = [uicolor clearcolor].cgcolor;
shapelayer.strokecolor = [uicolor redcolor].cgcolor;
shapelayer.linewidth = 5;
shapelayer.strokestart = 0;
shapelayer.strokeend = 0.8;
shapelayer.linecap = @"round";
shapelayer.linedashphase = 0.8;
shapelayer.path = bezierpath.cgpath;
//颜色渐变
nsmutablearray *colors = [nsmutablearray arraywithobjects:(id)[uicolor redcolor].cgcolor,(id)[uicolor whitecolor].cgcolor, nil];
cagradientlayer *gradientlayer = [cagradientlayer layer];
gradientlayer.shadowpath = bezierpath.cgpath;
gradientlayer.frame = cgrectmake(50, 50, 60, 60);
gradientlayer.startpoint = cgpointmake(0, 1);
gradientlayer.endpoint = cgpointmake(1, 0);
[gradientlayer setcolors:[nsarray arraywitharray:colors]];
[layer addsublayer:gradientlayer]; //设置颜色渐变
[layer setmask:shapelayer]; //设置圆环遮罩
[self.view.layer addsublayer:layer];
//动画
cabasicanimation *scaleanimation1 = [cabasicanimation animationwithkeypath:@"transform.scale"];
scaleanimation1.fromvalue = [nsnumber numberwithfloat:1.0];
scaleanimation1.tovalue = [nsnumber numberwithfloat:1.5];
scaleanimation1.autoreverses = yes;
// scaleanimation1.fillmode = kcafillmodeforwards;
scaleanimation1.duration = 0.8;
cabasicanimation *rotationanimation2 = [cabasicanimation animationwithkeypath:@"transform.rotation.z"];
rotationanimation2.fromvalue = [nsnumber numberwithfloat:0];
rotationanimation2.tovalue = [nsnumber numberwithfloat:6.0*m_pi];
rotationanimation2.autoreverses = yes;
// scaleanimation.fillmode = kcafillmodeforwards;
rotationanimation2.repeatcount = maxfloat;
rotationanimation2.begintime = 0.8; //延时执行，注释掉动画会同时进行
rotationanimation2.duration = 2;
//组合动画
caanimationgroup *groupannimation = [caanimationgroup animation];
groupannimation.duration = 4;
groupannimation.autoreverses = yes;
groupannimation.animations = @[scaleanimation1, rotationanimation2];
groupannimation.repeatcount = maxfloat;
[layer addanimation:groupannimation forkey:@"groupannimation"];
}
- (void)didreceivememorywarning {
[super didreceivememorywarning];
// dispose of any resources that can be recreated.
}
@end
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关键的地方在于cabasicanimation对象的初始化方式中keypath的设定。在ios中有以下几种不同的keypath，代表着不同的效果：
以上就是ios渐变圆环旋转动画 的资料整理，后续继续补充相关资料，谢谢大家对本站的支持！
原文链接：http://www.jianshu.com/p/0887aa418a7d
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