时间:2021-06-11 08:11:13 | 栏目:iOS代码 | 点击:次
先看下最后基本要实现的效果
总结一下自己的实现思路与所用到的类
1.这个肯定是要自定义的View类,起名为XDColorCircle吧,最后用的时候达到这样的效果
//创建XDColorCircle的实例化对象 XDColorCircle *circle=[[XDColorCircle alloc]initWithFrame:CGRectMake(0 ,100,self.view.frame.size.width,200)]; //添加到视图上展示 [self.view addSubview:circle];
2.然后就是在XDColorCircle里面代码思路
3.思路捋顺代码就很方便
//先都写在这个构造方法里面吧 - (instancetype)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { } return self; }
创建圈圈所在的View
self.backgroundColor=[UIColor clearColor]; UIView *circleView=[[UIView alloc]init]; circleView.frame=CGRectMake(0, 0,frame.size.width,frame.size.height); circleView.backgroundColor=[UIColor blueColor]; [self addSubview: circleView];
创建渐变图层并添加到圈圈视图
CAGradientLayer * gradientLayer = [CAGradientLayer layer]; gradientLayer.colors = @[(__bridge id)[UIColor whiteColor].CGColor,(__bridge id)[UIColor cyanColor].CGColor]; gradientLayer.locations = @[@0.2,@1.0]; gradientLayer.startPoint = CGPointMake(0, 0); gradientLayer.endPoint = CGPointMake(1.0, 0); gradientLayer.frame =CGRectMake(0, 0, self.frame.size.width, self.frame.size.height); [circleView.layer insertSublayer:_gradientLayer atIndex:0];
添加mask属性只让图层只显示一个圈圈
CAShapeLayer *layer=[[CAShapeLayer alloc]init]; CGMutablePathRef pathRef=CGPathCreateMutable(); CGPathAddRelativeArc(pathRef, nil,frame.size.width/2.0,frame.size.height/2.0,frame.size.width<frame.size.height?frame.size.width/2.0-5:frame.size.height/2.0-5,0, 2*M_PI); layer.path=pathRef; layer.lineWidth=5; layer.fillColor=[UIColor clearColor].CGColor; layer.strokeColor=[UIColor blackColor].CGColor; CGPathRelease(pathRef); circleView.layer.mask=layer;
让圈圈转起来添加动画
CABasicAnimation *animation=[CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; ; // 设定动画选项 animation.duration = 1; animation.removedOnCompletion = NO; animation.fillMode = kCAFillModeForwards; animation.repeatCount =HUGE_VALF; // 设定旋转角度 animation.fromValue = [NSNumber numberWithFloat:0.0]; // 起始角度 animation.toValue = [NSNumber numberWithFloat:2 * M_PI]; // 终止角度 [circleView.layer addAnimation:animation forKey:@"rotate-layer"];
添加中间的大文字Label
UILabel *label=[[UILabel alloc]init]; label.text=@"测试中"; label.font=[UIFont systemFontOfSize:32]; label.textAlignment=NSTextAlignmentCenter; label.frame=CGRectMake(0, 0,frame.size.width,frame.size.height); label.backgroundColor=[UIColor clearColor]; [self addSubview:label];
4.然后在controller里面使用
//创建XDColorCircle的实例化对象 XDColorCircle *circle=[[XDColorCircle alloc]initWithFrame:CGRectMake(0 ,100,self.view.frame.size.width,200)]; //添加到视图上展示 [self.view addSubview:circle];
只是个简单的动画实现小例子,可以看出活用CAShapeLayer和CABasicAnimation可以做出更炫的动画效果