iOS几个效果动画-------------------(实例详讲)qq粘性效果

这几天做了一些简单iOS的效果图，感觉苹果官方已经帮我们做了很多了，我们只是站在巨人的肩膀上编程，这些也没什么难的，最难的也就是用到了初中的三角函数，先让大家看看这几个动画吧。 先列这几个把，由上而下分别是 数据缓冲效果 ，粒子动画，HUD指示效果，QQ未读消息的粘性效果，图一把一半遮住就是一种音乐播放器的播放效果，好了图一,图二, 图三都好简单就好似黄子华讲过，我只要一张嘴，两只手就可以把她搞得好嗨皮，而图一 图二，图三就是只要一个Animation，两个Layer就搞定了，而图四也不难，下面详细说一下图四

粒子图

思路

- 添加控件

- 添加手势画线

- 重写drawRect方法

- 添加Layer

- 添加动画

HUD指示器

- 添加layer

- 添加动画

- 添加复制图层

缓冲跳动

- 添加控件

- 添加layer

- 添加动画

- 添加复制层

QQ粘性效果

--思路

新建自定义UIButton

添加拖动手势

计算圆的变化

计算圆之间矩形并且填充

回弹

爆炸

--步骤

先完成空间布局以及手势添加

然后计算圆的变化，计算圆之间的矩形面积

效果微调

预览代码结构图

详细步骤

- 在一个storyBoard里面拖一个UIButton进去，然后新建一个自定义UIBUtton类 如：ETBUtton类与之对应，好了，一切新建工作完毕，下面，我们只需要在自定义的UIButton类里面做功夫就好了，简单的代码直接上好

#import "ETStickBtn.h" @interface ETStickBtn () @property (nonatomic, strong) UIView *smalCirView; @property (nonatomic, assign) NSInteger oriRadius; @property (nonatomic, strong) CAShapeLayer *shapeLayer; @end @implementation ETStickBtn #pragma mark - 懒加载数据 - (UIView *)smalCirView{  if (!_smalCirView) {   // 新建一个圆   UIView *smalCirView = [[UIView alloc] init]; //  smalCirView.frame = self.frame;   smalCirView.backgroundColor = self.backgroundColor;   [self.superview insertSubview:smalCirView belowSubview:self];   _smalCirView = smalCirView;  }  return _smalCirView; } - (CAShapeLayer *)shapeLayer{  if (!_shapeLayer) {   CAShapeLayer *shapeLayer = [CAShapeLayer layer];   shapeLayer.fillColor = self.backgroundColor.CGColor;   [self.superview.layer insertSublayer:shapeLayer below:self.layer];   _shapeLayer = shapeLayer;  }  return _shapeLayer; } #pragma mark - 系统初始化 - (id)initWithFrame:(CGRect)frame{  self = [super initWithFrame:frame];  if (self) {   [self setUp];  }  return self; } - (void)awakeFromNib{   [self setUp]; } #pragma mark - 初始化视图 - (void)setUp{  CGFloat w = self.bounds.size.width;  self.layer.cornerRadius = w / 2;  self.smalCirView.layer.cornerRadius = w/2; // 记录半径  _oriRadius = w/2;  _smalCirView.frame = self.frame;  UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];  [self addGestureRecognizer:pan]; } 

• 在添加完Pan手势后当然我们要在自定义的Pan方法里面做功夫，先看看已经实现了拖动效果的Pan代码块吧。

  - (void)pan:(UIPanGestureRecognizer *)pan{ //  移动  CGPoint transPoint = [pan translationInView:self];  CGPoint center = self.center;  center.x += transPoint.x;  center.y += transPoint.y;  self.center = center;  [pan setTranslation:CGPointZero inView:self];  } 

• 就这样，可以拖动啦，接下来你想做什么呢？我就想你不断拖动大圆的过程中，小圆的半径一直减少直到为0， 具体思路是圆心距越大，小圆半径越小 ，这是奉上此时的Pan代码。

  - (void)pan:(UIPanGestureRecognizer *)pan{ //  移动  CGPoint transPoint = [pan translationInView:self];  CGPoint center = self.center;  center.x += transPoint.x;  center.y += transPoint.y;  self.center = center;  [pan setTranslation:CGPointZero inView:self]; //  设置小圆变化的值  CGFloat cirDistance = [self distanceWithPointA:self.center andPointB:self.smalCirView.center];  CGFloat smallCirRadius = _oriRadius - cirDistance/10.0;  if(smallCirRadius<0) smallCirRadius = 0;  _smalCirView.bounds = CGRectMake(0, 0, smallCirRadius * 2, smallCirRadius * 2);  self.smalCirView.layer.cornerRadius = smallCirRadius;  } #pragma mark - 获取圆心距离 - (CGFloat)distanceWithPointA:(CGPoint)pointA  andPointB:(CGPoint)pointB{  CGFloat offSetX = pointA.x - pointB.x;  CGFloat offSetY = pointA.y - pointB.y;  return sqrt(offSetX*offSetX + offSetY*offSetY); } 

• 好了，现在小圆终于可以随着两圆心距的变大而变小了，之后重头戏来了，获取贝塞尔曲线路径，也就是绘制两圆之间的曲线部分
• 这个也不难，只是用到初中的知识，先上个原型图(手绘)
• 
• 咳咳，由于用铅笔画的，有点模糊，那就奉上一个根据原型图用电脑绘制的图吧!
• 至此，重要的点都已经计算出来的，也不难吧，把算式换成代码如下

  - (UIBezierPath *)getBezierPathWithSmallCir:(UIView *)smallCir andBigCir:(UIView *)bigCir{ // 获取最小的圆  if (bigCir.frame.size.width < smallCir.frame.size.width) {   UIView *view = bigCir;   bigCir = smallCir;   smallCir = view;  } // 获取小圆的信息  CGFloat d = [self distanceWithPointA:smallCir.center andPointB:bigCir.center];  CGFloat x1 = smallCir.center.x;  CGFloat y1 = smallCir.center.y;  CGFloat r1 = smallCir.bounds.size.width/2; // 获取大圆的信息  CGFloat x2 = bigCir.center.x;  CGFloat y2 = bigCir.center.y;  CGFloat r2 = bigCir.bounds.size.width/2; // 获取三角函数  CGFloat sinA = (y2 - y1)/d;  CGFloat cosA = (x2 - x1)/d; // 获取矩形四个点  CGPoint pointA = CGPointMake(x1 - sinA*r1, y1 + cosA * r1);  CGPoint pointB = CGPointMake(x1 + sinA*r1, y1 - cosA * r1);  CGPoint pointC = CGPointMake(x2 + sinA*r2, y2 - cosA * r2);  CGPoint pointD = CGPointMake(x2 - sinA*r2, y2 + cosA * r2); // 获取控制点，以便画出曲线  CGPoint pointO = CGPointMake(pointA.x + d / 2 * cosA , pointA.y + d / 2 * sinA);  CGPoint pointP =  CGPointMake(pointB.x + d / 2 * cosA , pointB.y + d / 2 * sinA); // 创建路径  UIBezierPath *path =[UIBezierPath bezierPath];  [path moveToPoint:pointA];  [path addLineToPoint:pointB];  [path addQuadCurveToPoint:pointC controlPoint:pointP];  [path addLineToPoint:pointD];  [path addQuadCurveToPoint:pointA controlPoint:pointO];  return path; }
  
  
   

  //    获取最小的圆     if (bigCir.frame.size.width < smallCir.frame.size.width) {         UIView *view = bigCir;         bigCir = smallCir;         smallCir = view;     }

• 以上这段代码，由于我作图是小圆的圆心为x1 y1,所以如果把大圆小圆的位置调过来会导致曲线面积的中间鼓起来，所以为了防止别人传错值，也不用他们那么纠结了，我代码里面自己找出最小的圆就好了，所以一定要加上这一句，然后奉上此时的pan代码。

  - (void)pan:(UIPanGestureRecognizer *)pan{ //  移动  CGPoint transPoint = [pan translationInView:self];  CGPoint center = self.center;  center.x += transPoint.x;  center.y += transPoint.y;  self.center = center;  [pan setTranslation:CGPointZero inView:self]; //  设置小圆变化的值  CGFloat cirDistance = [self distanceWithPointA:self.center andPointB:self.smalCirView.center];  CGFloat smallCirRadius = _oriRadius - cirDistance/10.0;  if(smallCirRadius<0) smallCirRadius = 0;  _smalCirView.bounds = CGRectMake(0, 0, smallCirRadius * 2, smallCirRadius * 2);  self.smalCirView.layer.cornerRadius = smallCirRadius;    self.shapeLayer.path = [self getBezierPathWithSmallCir:self andBigCir:self.smalCirView].CGPath;    } 

• 好了接下来就是收尾部分了，只是我想做在超过一定距离后，按钮就完全被拖走了 依依不舍的走了。

  #pragma mark - 自定义方法 #pragma mark - 手势触发方法 #define MaxDistance 90 - (void)pan:(UIPanGestureRecognizer *)pan{ //  移动  CGPoint transPoint = [pan translationInView:self];  CGPoint center = self.center;  center.x += transPoint.x;  center.y += transPoint.y;  self.center = center;  [pan setTranslation:CGPointZero inView:self]; //  设置小圆变化的值  CGFloat cirDistance = [self distanceWithPointA:self.center andPointB:self.smalCirView.center];  CGFloat smallCirRadius = _oriRadius - cirDistance/10.0;  if(smallCirRadius<0) smallCirRadius = 0;  _smalCirView.bounds = CGRectMake(0, 0, smallCirRadius * 2, smallCirRadius * 2);  self.smalCirView.layer.cornerRadius = smallCirRadius;  // 画图  if (cirDistance > MaxDistance) {   self.smalCirView.hidden = YES;   [self.shapeLayer removeFromSuperlayer]; //  self.smalCirView  = nil;   self.shapeLayer = nil;  }else if(self.smalCirView.hidden == NO && cirDistance > 0){    self.shapeLayer.path = [self getBezierPathWithSmallCir:self andBigCir:self.smalCirView].CGPath;     } 

• 最后，我们判断在限定范围内放手就回弹，超过就爆炸消失

  #pragma mark - 自定义方法 #pragma mark - 手势触发方法 #define MaxDistance 90 - (void)pan:(UIPanGestureRecognizer *)pan{ //  移动  CGPoint transPoint = [pan translationInView:self];  CGPoint center = self.center;  center.x += transPoint.x;  center.y += transPoint.y;  self.center = center;  [pan setTranslation:CGPointZero inView:self]; //  设置小圆变化的值  CGFloat cirDistance = [self distanceWithPointA:self.center andPointB:self.smalCirView.center];  CGFloat smallCirRadius = _oriRadius - cirDistance/10.0;  if(smallCirRadius<0) smallCirRadius = 0;  _smalCirView.bounds = CGRectMake(0, 0, smallCirRadius * 2, smallCirRadius * 2);  self.smalCirView.layer.cornerRadius = smallCirRadius;  // 画图  if (cirDistance > MaxDistance) {   self.smalCirView.hidden = YES;   [self.shapeLayer removeFromSuperlayer]; //  self.smalCirView  = nil;   self.shapeLayer = nil;  }else if(self.smalCirView.hidden == NO && cirDistance > 0){    self.shapeLayer.path = [self getBezierPathWithSmallCir:self andBigCir:self.smalCirView].CGPath;  } // 爆炸或还原  if(pan.state == UIGestureRecognizerStateBegan){   NSLog(@"%@",NSStringFromCGRect(self.frame));  }  if (pan.state == UIGestureRecognizerStateEnded) {   if (cirDistance > MaxDistance){ //   这是动画的爆炸效果    UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.bounds];    NSLog(@"%@",NSStringFromCGRect(self.frame));    NSMutableArray *imageArr = [NSMutableArray array];    for (int i = 1 ; i < 9; i++) {     UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%d",i]];     [imageArr addObject:image];    }    imageView.animationImages = imageArr;    imageView.animationDuration = 0.5;    imageView.animationRepeatCount = 1;    [imageView startAnimating];    [self addSubview:imageView];    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.4 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ //    移除控件     [self removeFromSuperview];    });   }else{ //   回弹    [self.shapeLayer removeFromSuperlayer];    self.shapeLayer = nil;    [UIView animateWithDuration:0.5 delay:0 usingSpringWithDamping:0.2 initialSpringVelocity:0 options:UIViewAnimationOptionCurveLinear animations:^{     self.center = self.smalCirView.center;    } completion:^(BOOL finished) {     self.smalCirView.hidden = NO;    }];   }  } } 

• 这时基本上已经可以宣告完成的了，但是在爆炸效果释放的时候你会发现，爆炸效果不在我们当前的位置爆炸，而是在初始位置爆炸，这是因为苹果官方自动给StoryBoard添加了自动布局约束，这是只需要把约束渲染设为NO就好了，就是在ViewController里面加上一句代码

  - (void)viewDidLoad {     [super viewDidLoad];     self.view.translatesAutoresizingMaskIntoConstraints = NO; }

• 最后奉上整个类的代码

  #import "ETStickBtn.h" @interface ETStickBtn () @property (nonatomic, strong) UIView *smalCirView; @property (nonatomic, assign) NSInteger oriRadius; @property (nonatomic, strong) CAShapeLayer *shapeLayer; @end @implementation ETStickBtn #pragma mark - 懒加载数据 - (UIView *)smalCirView{  if (!_smalCirView) {   // 新建一个圆   UIView *smalCirView = [[UIView alloc] init]; //  smalCirView.frame = self.frame;   smalCirView.backgroundColor = self.backgroundColor;   [self.superview insertSubview:smalCirView belowSubview:self];   _smalCirView = smalCirView;  }  return _smalCirView; } - (CAShapeLayer *)shapeLayer{  if (!_shapeLayer) {   CAShapeLayer *shapeLayer = [CAShapeLayer layer];   shapeLayer.fillColor = self.backgroundColor.CGColor;   [self.superview.layer insertSublayer:shapeLayer below:self.layer];   _shapeLayer = shapeLayer;  }  return _shapeLayer; } #pragma mark - 系统初始化 - (id)initWithFrame:(CGRect)frame{  self = [super initWithFrame:frame];  if (self) {   [self setUp];  }  return self; } - (void)awakeFromNib{   [self setUp]; } #pragma mark - 初始化视图 - (void)setUp{  CGFloat w = self.bounds.size.width;  self.layer.cornerRadius = w / 2;  self.smalCirView.layer.cornerRadius = w/2; // 记录半径  _oriRadius = w/2;  _smalCirView.frame = self.frame;  UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];  [self addGestureRecognizer:pan]; } #pragma mark - 自定义方法 #pragma mark - 手势触发方法 #define MaxDistance 90 - (void)pan:(UIPanGestureRecognizer *)pan{ //  移动  CGPoint transPoint = [pan translationInView:self];  CGPoint center = self.center;  center.x += transPoint.x;  center.y += transPoint.y;  self.center = center;  [pan setTranslation:CGPointZero inView:self]; //  设置小圆变化的值  CGFloat cirDistance = [self distanceWithPointA:self.center andPointB:self.smalCirView.center];  CGFloat smallCirRadius = _oriRadius - cirDistance/10.0;  if(smallCirRadius<0) smallCirRadius = 0;  _smalCirView.bounds = CGRectMake(0, 0, smallCirRadius * 2, smallCirRadius * 2);  self.smalCirView.layer.cornerRadius = smallCirRadius;  // 画图  if (cirDistance > MaxDistance) {   self.smalCirView.hidden = YES;   [self.shapeLayer removeFromSuperlayer]; //  self.smalCirView  = nil;   self.shapeLayer = nil;  }else if(self.smalCirView.hidden == NO && cirDistance > 0){    self.shapeLayer.path = [self getBezierPathWithSmallCir:self andBigCir:self.smalCirView].CGPath;  } // 爆炸或还原  if(pan.state == UIGestureRecognizerStateBegan){   NSLog(@"%@",NSStringFromCGRect(self.frame));  }  if (pan.state == UIGestureRecognizerStateEnded) {   if (cirDistance > MaxDistance){ //   这是动画的爆炸效果    UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.bounds];    NSLog(@"%@",NSStringFromCGRect(self.frame));    NSMutableArray *imageArr = [NSMutableArray array];    for (int i = 1 ; i < 9; i++) {     UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"%d",i]];     [imageArr addObject:image];    }    imageView.animationImages = imageArr;    imageView.animationDuration = 0.5;    imageView.animationRepeatCount = 1;    [imageView startAnimating];    [self addSubview:imageView];    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.4 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ //    移除控件     [self removeFromSuperview];    });   }else{ //   回弹    [self.shapeLayer removeFromSuperlayer];    self.shapeLayer = nil;    [UIView animateWithDuration:0.5 delay:0 usingSpringWithDamping:0.2 initialSpringVelocity:0 options:UIViewAnimationOptionCurveLinear animations:^{     self.center = self.smalCirView.center;    } completion:^(BOOL finished) {     self.smalCirView.hidden = NO;    }];   }  } } #pragma mark - 获取圆心距离 - (CGFloat)distanceWithPointA:(CGPoint)pointA  andPointB:(CGPoint)pointB{  CGFloat offSetX = pointA.x - pointB.x;  CGFloat offSetY = pointA.y - pointB.y;  return sqrt(offSetX*offSetX + offSetY*offSetY); } #pragma mark - 获取贝塞尔曲线 - (UIBezierPath *)getBezierPathWithSmallCir:(UIView *)smallCir andBigCir:(UIView *)bigCir{ // 获取最小的圆  if (bigCir.frame.size.width < smallCir.frame.size.width) {   UIView *view = bigCir;   bigCir = smallCir;   smallCir = view;  } // 获取小圆的信息  CGFloat d = [self distanceWithPointA:smallCir.center andPointB:bigCir.center];  CGFloat x1 = smallCir.center.x;  CGFloat y1 = smallCir.center.y;  CGFloat r1 = smallCir.bounds.size.width/2; // 获取大圆的信息  CGFloat x2 = bigCir.center.x;  CGFloat y2 = bigCir.center.y;  CGFloat r2 = bigCir.bounds.size.width/2; // 获取三角函数  CGFloat sinA = (y2 - y1)/d;  CGFloat cosA = (x2 - x1)/d; // 获取矩形四个点  CGPoint pointA = CGPointMake(x1 - sinA*r1, y1 + cosA * r1);  CGPoint pointB = CGPointMake(x1 + sinA*r1, y1 - cosA * r1);  CGPoint pointC = CGPointMake(x2 + sinA*r2, y2 - cosA * r2);  CGPoint pointD = CGPointMake(x2 - sinA*r2, y2 + cosA * r2); // 获取控制点，以便画出曲线  CGPoint pointO = CGPointMake(pointA.x + d / 2 * cosA , pointA.y + d / 2 * sinA);  CGPoint pointP =  CGPointMake(pointB.x + d / 2 * cosA , pointB.y + d / 2 * sinA); // 创建路径  UIBezierPath *path =[UIBezierPath bezierPath];  [path moveToPoint:pointA];  [path addLineToPoint:pointB];  [path addQuadCurveToPoint:pointC controlPoint:pointP];  [path addLineToPoint:pointD];  [path addQuadCurveToPoint:pointA controlPoint:pointO];  return path; } @end 

  好了，一个简单的粘性效果完成了