iOS核心动画实现仿支付宝咻咻、雷达效果

今天闲余时间写了一个类似支付宝咻咻或者说雷达效果。望大神勿笑、写的粗糙。

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更新了下文章，贴出Demo地址（已更新一波）
github

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先上效果图吧：

ps:gif图有点抖~~~

雷达效果图

说下主要思路吧：

主要用到了CAShapeLayer和UIBezierPath的经典结合画出自己想要的图再结合CAAnimation将动画添加到layer上实现效果。

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timingFunction:动画的运动轨迹，用于变化起点和终点之间的插值计算，即它决定了动画运行的节奏，比如是均 匀变化（相同时间变化量相同）还是先快后慢，先慢后快还是先慢再快再慢。
动画的开始与结束的快慢，有五个预置分别为:
kCAMediaTimingFunctionLinear
线性，即匀速
kCAMediaTimingFunctionEaseIn 先慢后快
kCAMediaTimingFunctionEaseOut 先快后慢
kCAMediaTimingFunctionEaseInEaseOut 先慢后快再慢
kCAMediaTimingFunctionDefault 中间快

代码部分 （ 基本全部代码）

自定义一个view-- RadarAnimationView.h：

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这里提供了一些属性、可以在外部进行设置。

 //定义Block的目的是为了点击雷达中间按钮时调用，此处定义，方便以后使用。
  typedef void(^RaderBtnBlock)(); 
  typedef void(^RaderBtnSelectBlock)();

  #import 

 //雷达效果
 @interface RadarAnimationView : UIView

 /**
 *  按钮图片  
 */
 @property (nonatomic ,strong) UIImage *image;
 /**
  *  按钮选中图片
 */
 @property (nonatomic ,strong) UIImage *selectImage;
 /**
 *  波纹颜色
 */
  @property (nonatomic,strong) UIColor *raderColor;

 /**
  *  按钮block  未选择状态
 */
 @property (nonatomic,copy) RaderBtnBlock block;
 /**
 *  按钮block  选择状态
 */
    @property (nonatomic,copy) RaderBtnSelectBlock selectBlock;

 @end

RadarAnimationView.m实现部分

static const float timeinterval = 0.5;

#import 
#import "RadarAnimationView.h"

@interface RadarAnimationView ()
//按钮图片
@property (nonatomic,strong)UIButton *iamgeBtn;

@end

@implementation RadarAnimationView

- (void)drawRect:(CGRect)rect {

    self.alpha = 0.5;
     for (int i = 0; i < 20; i++) {
        [self addAnimationDelay:i];
      }
}

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
   
        _iamgeBtn = [[UIButton alloc]    initWithFrame:self.bounds];
        [_iamgeBtn addTarget:self action:@selector(imageBtnClick:)     forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:_iamgeBtn];
   
        //设置默认波纹颜色
        self.raderColor = [UIColor blueColor];
    }
    return self;
}

//按钮点击事件
-(void)imageBtnClick:(UIButton *)btn
{
    if (btn.selected) {
  
        NSLog(@"1");
        //调用block
        self.block(@"1");
   
    }else
    {
        NSLog(@"2");
        //调用block
        self.selectBlock(@"2");
    }

    btn.selected = !btn.selected;
}

//重写setter方法
-(void)setImage:(UIImage *)image
{
    _image = image;
    [self.iamgeBtn setImage:image forState:0];
}

-(void)setSelectImage:(UIImage *)selectImage
{
    _selectImage = selectImage;
    [self.iamgeBtn setImage:selectImage forState:1];
}

-(void)setRaderColor:(UIColor *)raderColor
{
    _raderColor = raderColor;
}





-(void)addAnimationDelay:(int)time
       {
            CGPoint centerPoint = CGPointMake(self.bounds.size.height / 2, self.bounds.size.width / 2);

        //使用贝塞尔画圆
        UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:centerPoint radius:10 startAngle:0 endAngle:2 * M_PI clockwise:YES];

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.frame = self.bounds;
    shapeLayer.fillColor = self.raderColor.CGColor;
    shapeLayer.opacity = 0.2;
    shapeLayer.path = path.CGPath;


    [self.layer insertSublayer:shapeLayer below:self.iamgeBtn.layer];

    //雷达圈圈大小的动画
    CABasicAnimation *basicAnimation = [CABasicAnimation animation];
    basicAnimation.keyPath = @"path";
    CGPoint center = CGPointMake(self.bounds.size.height / 2, self.bounds.size.width / 2);
    UIBezierPath *path1 = [UIBezierPath bezierPathWithArcCenter:center radius:10 startAngle:0 endAngle:2 * M_PI clockwise:YES];
    UIBezierPath *path2 = [UIBezierPath bezierPathWithArcCenter:center radius:[UIScreen mainScreen].bounds.size.height startAngle:0 endAngle:2 * M_PI clockwise:YES];
    basicAnimation.fromValue = (__bridge id _Nullable)(path1.CGPath);
    basicAnimation.toValue = (__bridge id _Nullable)(path2.CGPath);
    basicAnimation.fillMode = kCAFillModeForwards;


    //雷达圈圈的透明度
    CABasicAnimation *opacityAnimation = [CABasicAnimation animation];
    opacityAnimation.keyPath = @"opacity";

    opacityAnimation.fromValue = @(0.2);
    opacityAnimation.toValue = @(0);
    opacityAnimation.fillMode = kCAFillModeForwards;

    CAAnimationGroup *group = [CAAnimationGroup animation];
    group.animations = @[basicAnimation,opacityAnimation];

    //动画间隔时间  这里的值和创建的动画个数需要计算好，避免最后一轮动画结束了，第一个动画好没有结束，出现效果差
    group.duration = 10;
    //动画开始时间
    group.beginTime = CACurrentMediaTime() + (double)time/2;

    //循环次数最大（无尽）  HUGE
    group.repeatCount = HUGE;

    group.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    group.delegate = self;
    //指定的时间段完成后,动画就自动的从层上移除
    group.removedOnCompletion = YES;
    //添加动画到layer
    [shapeLayer addAnimation:group forKey:nil];

}
@end

在VC中调用

//

#import "ViewController.h"
#import "RadarAnimationView.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor colorWithRed:23/255.0 green:26/255.0 blue:40/255.0 alpha:1];

    RadarAnimationView *rader = [[RadarAnimationView alloc]initWithFrame:CGRectMake(100, 100, 50, 50)];
    rader.center = self.view.center;

    rader.backgroundColor = [UIColor lightGrayColor];
    rader.image = [UIImage imageNamed:@"IMG_1314.JPG"];
     
    //点击按钮时两种状态调用的两种block
    rader.block = ^{

        NSLog(@"1");
    };

    rader.selectBlock = ^{
    
        NSLog(@"2");
    };

    [self.view addSubview:rader];
}



@end

好了基本实现了。