iOS渐变圆环旋转动画CAShapeLayer CAGradientLayer

ios渐变圆环旋转动画cashapelayer cagradientlayer

shape.gif

demo.png

- (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

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！