iOS-各种动画特效

超、凢脫俗 2022-05-31 09:53 355阅读 0赞

# 概述 #

广播跑马灯/弹幕/直播点赞/烟花/雪花等动画特效, 后续增加~

# 详细 #

#### 代码下载：[http://www.demodashi.com/demo/10674.html][http_www.demodashi.com_demo_10674.html] ####

![661F567F-3399-4227-ACCD-3C0FB6EB966D.png][]

#### 一、实现功能 ####

*  1. 广播跑马灯
 *  2. 弹幕动画
 *  3. 直播点赞动画
 *  4. 直播点赞图片动画
 *  5. 烟花动画
 *  6. 雪花动画

#### 二、程序实现 ####

1. 广播动画特效:

思路:

1. 初始化广播视图

2. 设置广播公告广告内容

3. 添加动画效果

初始化广播视图, 广播活动标题按钮 与 广播活动标题标签 控件大小一样

/**
     * 设置广播视图
     */
    - (void)setupBroadcastingView {
        // 设置广播活动标题按钮
        UIButton *activityBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        activityBtn.frame = CGRectMake(0, 64, [UIScreen mainScreen].bounds.size.width, 30);
        activityBtn.backgroundColor = [UIColor clearColor];
        [activityBtn addTarget:self action:@selector(activityDetail) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:activityBtn];
        self.activityBtn = activityBtn;
        
        // 设置广播活动标题文字
        UILabel *activityLb = [[UILabel alloc] init];
        activityLb.frame = activityBtn.bounds;
        [activityLb setFont:[UIFont boldSystemFontOfSize:14]];
        [activityLb setTextColor:[UIColor colorWithRed:115/255.0 green:125/255.0 blue:134/255.0 alpha:1.0]];
        [activityLb setBackgroundColor:[UIColor clearColor]];
        [activityBtn addSubview:activityLb];
        self.activityLb = activityLb;
        
        // 设置广播logo
        UIImageView *speaker = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[NSString stringWithFormat:@"broadcasting"]]];
        speaker.frame = CGRectMake(0, 5, 20, 20);
        speaker.backgroundColor = self.view.backgroundColor;
        [activityBtn addSubview:speaker];
        
        // 设置广播公告广告内容
        [self setActivityButtonTitle];
    }

设置广播公告广告内容, 这里是以假数据填充,一般需求会是后台请求得来的活动内容.

添加动画效果: 当文字内容超过显示区域就滚动展示,未超过则居中展示.

/**
     * 设置广播公告广告内容
     */
    - (void)setActivityButtonTitle {
        
        // 广播公告广告内容(假数据)
        NSString *title = @"广播公告广告内容(ZL测试内容)广播公告广告内容(测试内容)\r\n广播公告广告内容(测试内容)广播公告广告内容(测试内容)广播公告广告内容(测试内容)";
        
        title = [title stringByReplacingOccurrencesOfString:@"\r\n" withString:@" "];
        
        [self.activityLb setText:title];
        
        [self.activityLb sizeToFit];
        
        if (self.activityLb.frame.size.width <= self.activityBtn.frame.size.width) {
            
            [self.activityLb setCenter:CGPointMake(self.activityBtn.frame.size.width/2, self.activityBtn.frame.size.height/2)];
            
        } else { // 当文字内容超过显示区域就滚动展示
            
            CGRect frame = self.activityLb.frame;
            frame.origin.x = self.activityBtn.frame.size.width;
            frame.origin.y = self.activityBtn.frame.size.height * 0.5 - self.activityLb.bounds.size.height * 0.5;
            self.activityLb.frame = frame;
            
            [UIView beginAnimations:@"testAnimation" context:NULL];
            [UIView setAnimationDuration:frame.size.width/55.f];
            [UIView setAnimationCurve:UIViewAnimationCurveLinear];
            [UIView setAnimationRepeatAutoreverses:NO];
            [UIView setAnimationRepeatCount:INT_MAX];
            
            frame = self.activityLb.frame;
            frame.origin.x = - frame.size.width;
            self.activityLb.frame = frame;
            [UIView commitAnimations];
        }
    }

当有活动链接时,需要添加点击效果; 如果没则不需要创建按钮及点击效果.

// 展示活动详情
    - (void)activityDetail {
        
        NSLog(@"点击了广播活动公告详情");
    }

![广播跑马灯.gif][.gif]

2. 弹幕动画特效:

先自定义弹幕标签ZLScrollLabelView:

.h 文件露出开始/停止/暂停/恢复弹幕动画

@interface ZLScrollLabelView : UIView
    // 代理协议
    @property (nonatomic, weak) id <ZLScrollLabelViewDelegate> delegate;
    // 速度
    @property (nonatomic) CGFloat speed;
    // 方向
    @property (nonatomic) ScrollDirectionType barrageDirection;
    // 容器
    - (void)addContentView:(UIView *)view;
    // 开始
    - (void)startAnimation;
    // 停止
    - (void)stopAnimation;
    // 暂停
    - (void)pauseAnimation;
    // 恢复
    - (void)resumeAnimation;
    @end

.m 文件初始化:

- (instancetype)initWithFrame:(CGRect)frame {
        
        if (self = [super initWithFrame:frame]) {
            
            _width = frame.size.width;
            _height = frame.size.height;
            
            self.speed = 1.f;
            self.barrageDirection = FromLeftType;
            self.layer.masksToBounds = YES;
            self.animationView = [[UIView alloc] initWithFrame:CGRectMake(_width, 0, _width, _height)];
            [self addSubview:self.animationView];
        }
        
        return self;
    }
    - (void)addContentView:(UIView *)view {
        
        [_contentView removeFromSuperview];
        
        view.frame = view.bounds;
        _contentView = view;
        self.animationView.frame = view.bounds;
        [self.animationView addSubview:_contentView];
        
        _animationViewWidth = self.animationView.frame.size.width;
        _animationViewHeight = self.animationView.frame.size.height;
    }

开始弹幕动画:

- (void)startAnimation {
        
        [self.animationView.layer removeAnimationForKey:@"animationViewPosition"];
        _stoped = NO;
        
        CGPoint pointRightCenter = CGPointMake(_width + _animationViewWidth / 2.f, _animationViewHeight / 2.f);
        CGPoint pointLeftCenter  = CGPointMake(-_animationViewWidth / 2, _animationViewHeight / 2.f);
        CGPoint fromPoint = self.barrageDirection == FromLeftType ? pointRightCenter : pointLeftCenter;
        CGPoint toPoint = self.barrageDirection == FromLeftType ? pointLeftCenter  : pointRightCenter;
        
        self.animationView.center = fromPoint;
        UIBezierPath *movePath = [UIBezierPath bezierPath];
        [movePath moveToPoint:fromPoint];
        [movePath addLineToPoint:toPoint];
        
        CAKeyframeAnimation *moveAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
        moveAnimation.path = movePath.CGPath;
        moveAnimation.removedOnCompletion = YES;
        moveAnimation.duration = _animationViewWidth / 30.f * (1 / self.speed);
        moveAnimation.delegate = self;
        [self.animationView.layer addAnimation:moveAnimation forKey:@"animationViewPosition"];
    }

停止弹幕动画:

- (void)stopAnimation {
        
        _stoped = YES;
        [self.animationView.layer removeAnimationForKey:@"animationViewPosition"];
    }
    
    - (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
        
        if (self.delegate && [self.delegate respondsToSelector:@selector(barrageView:animationDidStopFinished:)]) {
            
            [self.delegate barrageView:self animationDidStopFinished:flag];
        }
        
        if (flag && !_stoped) {
            
            [self startAnimation];
        }
    }

暂停弹幕动画:

- (void)pauseAnimation {
        
        [self pauseLayer:self.animationView.layer];
    }
    
    - (void)pauseLayer:(CALayer*)layer {
        
        CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];
        layer.speed = 0.0;
        layer.timeOffset = pausedTime;
    }

恢复弹幕动画:

- (void)resumeAnimation {
        
        [self resumeLayer:self.animationView.layer];
    }
    
    - (void)resumeLayer:(CALayer*)layer {
        
        CFTimeInterval pausedTime = layer.timeOffset;
        layer.speed = 1.0;
        layer.timeOffset = 0.0;
        layer.beginTime = 0.0;
        CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;
        layer.beginTime = timeSincePause;
    }

在所需控制器里, 添加代理ZLScrollLabelViewDelegate实现开始动画方法

- (void)viewDidLoad {
        [super viewDidLoad];
        self.navigationItem.title = @"弹幕动画";
        self.view.backgroundColor = [UIColor grayColor];
        
        ZLScrollLabelView *barrageView0 = [[ZLScrollLabelView alloc] initWithFrame:CGRectMake(0, 104, self.view.frame.size.width, 20)];
        barrageView0.delegate = self;
        // add
        [self.view addSubview:barrageView0];
        // text
        [barrageView0 addContentView:[self createLabelWithText:@"超喜欢赵丽颖,只因她的踏实!"
                                                         textColor:[self randomColor]]];
        // start
        [barrageView0 startAnimation];
    }

代理ZLScrollLabelViewDelegate:

- (UILabel *)createLabelWithText:(NSString *)text textColor:(UIColor *)textColor {
        
        NSString *string = [NSString stringWithFormat:@" %@ ", text];
        CGFloat width = [string widthWithStringAttribute:@{NSFontAttributeName : [UIFont systemFontOfSize:14.f]}];
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, width, 20)];
        label.font = [UIFont systemFontOfSize:14.f];
        label.text = string;
        label.textColor = textColor;
        return label;
    }
    
    #pragma mark - ZLScrollLabelViewDelegate
    
    - (void)barrageView:(ZLScrollLabelView *)barrageView animationDidStopFinished:(BOOL)finished {
        
        [barrageView stopAnimation];
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [barrageView addContentView:[self createLabelWithText:[self randomString]
                                                            textColor:[self randomColor]]];
            [barrageView startAnimation];
        });
    }
    
    - (NSString *)randomString {
        
        NSArray *array = @[@"猜猜我是谁?",
                           @"哈哈",
                           @"猜不着吧",
                           @"我是程序媛",
                           @"噜啦啦啦啦~"];
        return array[arc4random() % array.count];
    }

![弹幕动画.gif][.gif 1]

3. 直播点赞效果

先自定义ZLLiveHeartView,露出liveHeartAnimateInView方法:

- (void)liveHeartAnimateInView:(UIView *)view {
        
        NSTimeInterval totalAnimationDuration = 8;
        CGFloat heartSize = CGRectGetWidth(self.bounds);
        CGFloat heartCenterX = self.center.x;
        CGFloat viewHeight = CGRectGetHeight(view.bounds);
        
        // Pre-Animation setup
        self.transform = CGAffineTransformMakeScale(0, 0);
        self.alpha = 0;
        
        // Bloom
        [UIView animateWithDuration:0.5 delay:0.0 usingSpringWithDamping:0.6 initialSpringVelocity:0.8 options:UIViewAnimationOptionCurveEaseOut animations:^{
            self.transform = CGAffineTransformIdentity;
            self.alpha = 0.9;
        } completion:NULL];
        
        NSInteger i = arc4random_uniform(2);
        // -1 OR 1
        NSInteger rotationDirection = 1 - (2 * i);
        NSInteger rotationFraction = arc4random_uniform(10);
        [UIView animateWithDuration:totalAnimationDuration animations:^{
            self.transform = CGAffineTransformMakeRotation(rotationDirection * M_PI / (16 + rotationFraction * 0.2));
        } completion:NULL];
        
        UIBezierPath *heartTravelPath = [UIBezierPath bezierPath];
        [heartTravelPath moveToPoint:self.center];
        
        // random end point
        CGPoint endPoint = CGPointMake(heartCenterX + (rotationDirection) * arc4random_uniform(2 * heartSize), viewHeight/6.0 + arc4random_uniform(viewHeight / 4.0));
        
        // random Control Points
        NSInteger j = arc4random_uniform(2);
        NSInteger travelDirection = 1- (2*j);
        
        // randomize x and y for control points
        CGFloat xDelta = (heartSize/2.0 + arc4random_uniform(2*heartSize)) * travelDirection;
        CGFloat yDelta = MAX(endPoint.y ,MAX(arc4random_uniform(8*heartSize), heartSize));
        CGPoint controlPoint1 = CGPointMake(heartCenterX + xDelta, viewHeight - yDelta);
        CGPoint controlPoint2 = CGPointMake(heartCenterX - 2*xDelta, yDelta);
        
        [heartTravelPath addCurveToPoint:endPoint controlPoint1:controlPoint1 controlPoint2:controlPoint2];
        
        CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
        keyFrameAnimation.path = heartTravelPath.CGPath;
        keyFrameAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
        keyFrameAnimation.duration = totalAnimationDuration + endPoint.y/viewHeight;
        [self.layer addAnimation:keyFrameAnimation forKey:@"positionOnPath"];
        
        // Alpha & remove from superview
        [UIView animateWithDuration:totalAnimationDuration animations:^{
            self.alpha = 0.0;
        } completion:^(BOOL finished) {
            [self removeFromSuperview];
        }];
        
    }

- (void)drawRect:(CGRect)rect {
        
        [_strokeColor setStroke];
        [_fillColor setFill];
        
        CGFloat drawingPadding = 4.0;
        CGFloat curveRadius = floor((CGRectGetWidth(rect) - 2*drawingPadding) / 4.0);
        
        // Creat path
        UIBezierPath *heartPath = [UIBezierPath bezierPath];
        
        // Start at bottom heart tip
        CGPoint tipLocation = CGPointMake(floor(CGRectGetWidth(rect) / 2.0), CGRectGetHeight(rect) - drawingPadding);
        [heartPath moveToPoint:tipLocation];
        
        // Move to top left start of curve
        CGPoint topLeftCurveStart = CGPointMake(drawingPadding, floor(CGRectGetHeight(rect) / 2.4));
        
        [heartPath addQuadCurveToPoint:topLeftCurveStart controlPoint:CGPointMake(topLeftCurveStart.x, topLeftCurveStart.y + curveRadius)];
        
        // Create top left curve
        [heartPath addArcWithCenter:CGPointMake(topLeftCurveStart.x + curveRadius, topLeftCurveStart.y) radius:curveRadius startAngle:M_PI endAngle:0 clockwise:YES];
        
        // Create top right curve
        CGPoint topRightCurveStart = CGPointMake(topLeftCurveStart.x + 2*curveRadius, topLeftCurveStart.y);
        [heartPath addArcWithCenter:CGPointMake(topRightCurveStart.x + curveRadius, topRightCurveStart.y) radius:curveRadius startAngle:M_PI endAngle:0 clockwise:YES];
        
        // Final curve to bottom heart tip
        CGPoint topRightCurveEnd = CGPointMake(topLeftCurveStart.x + 4*curveRadius, topRightCurveStart.y);
        [heartPath addQuadCurveToPoint:tipLocation controlPoint:CGPointMake(topRightCurveEnd.x, topRightCurveEnd.y + curveRadius)];
        
        [heartPath fill];
        heartPath.lineWidth = 1;
        heartPath.lineCapStyle = kCGLineCapRound;
        heartPath.lineJoinStyle = kCGLineCapRound;
        [heartPath stroke];
    }

再在所需控制器里添加ZLLiveHeartView.

- (void)showLiveHeartView {
        
        ZLLiveHeartView *heart = [[ZLLiveHeartView alloc]initWithFrame:CGRectMake(0, 0, 40, 40)];
        [self.view addSubview:heart];
        CGPoint fountainSource = CGPointMake(self.view.frame.size.width - 80, self.view.bounds.size.height - 30 / 2.0 - 10);
        heart.center = fountainSource;
        [heart liveHeartAnimateInView:self.view];
    }

![直播点赞动画.gif][.gif 2]

4. 直播图片点赞动画

先自定义ZLLikeAnimation,animatePictureInView方法:

- (void)animatePictureInView:(UIView *)view Image:(UIImage *)image {
        
        self.imageView.image = image;
        NSTimeInterval totalAnimationDuration = 8;
        CGFloat heartSize = CGRectGetWidth(self.bounds);
        CGFloat heartCenterX = self.center.x;
        CGFloat viewHeight = CGRectGetHeight(view.bounds);
        
        // Pre-Animation setup
        self.transform = CGAffineTransformMakeScale(0, 0);
        self.alpha = 0;
        
        // Bloom
        [UIView animateWithDuration:0.5 delay:0.0 usingSpringWithDamping:0.6 initialSpringVelocity:0.8 options:UIViewAnimationOptionCurveEaseOut animations:^{
            self.transform = CGAffineTransformIdentity;
            self.alpha = 0.9;
        } completion:NULL];
        
        NSInteger i = arc4random_uniform(2);
        // -1 OR 1
        NSInteger rotationDirection = 1 - (2 * i);
        NSInteger rotationFraction = arc4random_uniform(10);
        [UIView animateWithDuration:totalAnimationDuration animations:^{
            self.transform = CGAffineTransformMakeRotation(rotationDirection * M_PI / (16 + rotationFraction * 0.2));
        } completion:NULL];
        
        UIBezierPath *heartTravelPath = [UIBezierPath bezierPath];
        [heartTravelPath moveToPoint:self.center];
        
        // random end point
        CGPoint endPoint = CGPointMake(heartCenterX + (rotationDirection) * arc4random_uniform(2 * heartSize), viewHeight/6.0 + arc4random_uniform(viewHeight / 4.0));
        
        // random Control Points
        NSInteger j = arc4random_uniform(2);
        NSInteger travelDirection = 1 - (2 * j);
        
        // randomize x and y for control points
        CGFloat xDelta = (heartSize / 2.0 + arc4random_uniform(2 * heartSize)) * travelDirection;
        CGFloat yDelta = MAX(endPoint.y ,MAX(arc4random_uniform(8 * heartSize), heartSize));
        CGPoint controlPoint1 = CGPointMake(heartCenterX + xDelta, viewHeight - yDelta);
        CGPoint controlPoint2 = CGPointMake(heartCenterX - 2 * xDelta, yDelta);
        
        [heartTravelPath addCurveToPoint:endPoint controlPoint1:controlPoint1 controlPoint2:controlPoint2];
        
        CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
        keyFrameAnimation.path = heartTravelPath.CGPath;
        keyFrameAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
        keyFrameAnimation.duration = totalAnimationDuration + endPoint.y / viewHeight;
        [self.layer addAnimation:keyFrameAnimation forKey:@"positionOnPath"];
        
        // Alpha & remove from superview
        [UIView animateWithDuration:totalAnimationDuration animations:^{
            self.alpha = 0.0;
        } completion:^(BOOL finished) {
            [self removeFromSuperview];
        }];
        
    }

再在所需控制器里添加ZLLikeAnimation.

- (void)showLikePictureView {
        
        ZLLikeAnimation *heart = [[ZLLikeAnimation alloc]initWithFrame:CGRectMake(0, 0, 40, 40)];
        [self.view addSubview:heart];
        CGPoint fountainSource = CGPointMake(self.view.frame.size.width - 80, self.view.bounds.size.height - 30 / 2.0 - 10);
        heart.center = fountainSource;
        int count = round(random() % 12);
        [heart animatePictureInView:self.view Image:[UIImage imageNamed:[NSString stringWithFormat:@"resource.bundle/heart%d.png",count]]];
    }

![直播点赞图片动画.gif][.gif 3]

5. 烟花特效:

设置烟花

- (void)setupFireworks {
        
        self.caELayer = [CAEmitterLayer layer];
        
        // 发射源
        self.caELayer.emitterPosition = CGPointMake(self.view.frame.size.width / 2, self.view.frame.size.height - 50);
        // 发射源尺寸大小
        self.caELayer.emitterSize = CGSizeMake(50, 0);
        // 发射源模式
        self.caELayer.emitterMode = kCAEmitterLayerOutline;
        // 发射源的形状
        self.caELayer.emitterShape = kCAEmitterLayerLine;
        // 渲染模式
        self.caELayer.renderMode = kCAEmitterLayerAdditive;
        // 发射方向
        self.caELayer.velocity = 1;
        // 随机产生粒子
        self.caELayer.seed = (arc4random() % 100) + 1;
        
        // cell
        CAEmitterCell *cell = [CAEmitterCell emitterCell];
        // 速率
        cell.birthRate = 1.0;
        // 发射的角度
        cell.emissionRange = 0.11 * M_PI;
        // 速度
        cell.velocity = 300;
        // 范围
        cell.velocityRange = 150;
        // Y轴 加速度分量
        cell.yAcceleration = 75;
        // 声明周期
        cell.lifetime  = 2.04;
        // 是个CGImageRef的对象,既粒子要展现的图片
        cell.contents = (id)[[UIImage imageNamed:@"ring"] CGImage];
        // 缩放比例
        cell.scale = 0.2;
        // 粒子的颜色
        cell.color = [[UIColor colorWithRed:0.6 green:0.6 blue:0.6 alpha:1.0] CGColor];
        // 一个粒子的颜色green 能改变的范围
        cell.greenRange = 1.0;
        // 一个粒子的颜色red 能改变的范围
        cell.redRange = 1.0;
        // 一个粒子的颜色blue 能改变的范围
        cell.blueRange = 1.0;
        // 子旋转角度范围
        cell.spinRange = M_PI;
        
        // 爆炸
        CAEmitterCell *burst = [CAEmitterCell emitterCell];
        // 粒子产生系数
        burst.birthRate = 1.0;
        // 速度
        burst.velocity = 0;
        // 缩放比例
        burst.scale = 2.5;
        // shifting粒子red在生命周期内的改变速度
        burst.redSpeed = -1.5;
        // shifting粒子blue在生命周期内的改变速度
        burst.blueSpeed= +1.5;
        // shifting粒子green在生命周期内的改变速度
        burst.greenSpeed = +1.0;
        // 生命周期
        burst.lifetime = 0.35;
        
        
        // 火花 and finally, the sparks
        CAEmitterCell *spark = [CAEmitterCell emitterCell];
        // 粒子产生系数，默认为1.0
        spark.birthRate = 400;
        // 速度
        spark.velocity = 125;
        // 360 deg //周围发射角度
        spark.emissionRange = 2 * M_PI;
        // gravity //y方向上的加速度分量
        spark.yAcceleration = 75;
        // 粒子生命周期
        spark.lifetime = 3;
        // 是个CGImageRef的对象,既粒子要展现的图片
        spark.contents = (id)
        [[UIImage imageNamed:@"fireworks"] CGImage];
        // 缩放比例速度
        spark.scaleSpeed = -0.2;
        // 粒子green在生命周期内的改变速度
        spark.greenSpeed = -0.1;
        // 粒子red在生命周期内的改变速度
        spark.redSpeed = 0.4;
        // 粒子blue在生命周期内的改变速度
        spark.blueSpeed = -0.1;
        // 粒子透明度在生命周期内的改变速度
        spark.alphaSpeed = -0.25;
        // 子旋转角度
        spark.spin = 2 * M_PI;
        // 子旋转角度范围
        spark.spinRange = 2 * M_PI;
        
        self.caELayer.emitterCells = [NSArray arrayWithObject:cell];
        cell.emitterCells = [NSArray arrayWithObjects:burst, nil];
        burst.emitterCells = [NSArray arrayWithObject:spark];
        [self.view.layer addSublayer:self.caELayer];
    }

![烟花效果.gif][.gif 4]

6. 雪花特效:

设置雪花

- (void)setupSnowflake {
        
        // 创建粒子Layer
        CAEmitterLayer *snowEmitter = [CAEmitterLayer layer];
        
        // 粒子发射位置
        snowEmitter.emitterPosition = CGPointMake(120,0);
        
        // 发射源的尺寸大小
        snowEmitter.emitterSize = self.view.bounds.size;
        
        // 发射模式
        snowEmitter.emitterMode = kCAEmitterLayerSurface;
        
        // 发射源的形状
        snowEmitter.emitterShape = kCAEmitterLayerLine;
        
        // 创建雪花类型的粒子
        CAEmitterCell *snowflake = [CAEmitterCell emitterCell];
        
        // 粒子的名字
        snowflake.name = @"snow";
        
        // 粒子参数的速度乘数因子
        snowflake.birthRate = 20.0;
        snowflake.lifetime = 120.0;
        
        // 粒子速度
        snowflake.velocity = 10.0;
        
        // 粒子的速度范围
        snowflake.velocityRange = 10;
        
        // 粒子y方向的加速度分量
        snowflake.yAcceleration = 2;
        
        // 周围发射角度
        snowflake.emissionRange = 0.5 * M_PI;
        
        // 子旋转角度范围
        snowflake.spinRange = 0.25 * M_PI;
        snowflake.contents  = (id)[[UIImage imageNamed:@"snow"] CGImage];
        
        // 设置雪花形状的粒子的颜色
        snowflake.color = [[UIColor whiteColor] CGColor];
        snowflake.redRange = 1.5f;
        snowflake.greenRange = 2.2f;
        snowflake.blueRange = 2.2f;
        
        snowflake.scaleRange = 0.6f;
        snowflake.scale = 0.7f;
        
        snowEmitter.shadowOpacity = 1.0;
        snowEmitter.shadowRadius = 0.0;
        snowEmitter.shadowOffset = CGSizeMake(0.0, 0.0);
        
        // 粒子边缘的颜色
        snowEmitter.shadowColor = [[UIColor whiteColor] CGColor];
        
        // 添加粒子
        snowEmitter.emitterCells = @[snowflake];
        
        // 将粒子Layer添加进图层中
        [self.view.layer addSublayer:snowEmitter];
        
        // 形成遮罩
        UIImage *image = [UIImage imageNamed:@"alpha"];
        _layer = [CALayer layer];
        _layer.frame = (CGRect){CGPointZero, self.view.bounds.size};
        _layer.contents = (__bridge id)(image.CGImage);
        _layer.position = self.view.center;
        snowEmitter.mask = _layer;
    }

![雪花效果.gif][.gif 5]

#### 三、压缩文件截图 ####

1、压缩文件截图

![C13A68F1-C6FC-492B-A7DC-B0D28285B032.png][]

2.项目截图:

![0E1F6A16-FEC9-4B57-9D09-C1F268860182.png][]

#### 四、其他补充 ####

持续更新添加动画特效~

界面性问题可以根据自己项目需求调整即可, 具体可参考代码, 项目能够直接运行!

#### 注：本文著作权归作者，由demo大师（[http://www.demodashi.com][http_www.demodashi.com]）宣传，拒绝转载，转载需要作者授权 ####

[http_www.demodashi.com_demo_10674.html]: http://www.demodashi.com/demo/10674.html
[661F567F-3399-4227-ACCD-3C0FB6EB966D.png]: /images/20220531/9cc944b2c3b743169bf5b7ec99344dbd.png
[.gif]: /images/20220531/e5ef41fbf2564074b92915f6f3e38951.png
[.gif 1]: /images/20220531/581c200b3aa4490881015679eb402a89.png
[.gif 2]: /images/20220531/a003ace038204d75b0480074307fc370.png
[.gif 3]: /images/20220531/706a8271930e476da2a1960cdeb3588c.png
[.gif 4]: /images/20220531/14c3d5c16cda46a4847578ff2756dd8e.png
[.gif 5]: /images/20220531/dbcf0d8aa8e9465ea99ce2082547d795.png
[C13A68F1-C6FC-492B-A7DC-B0D28285B032.png]: /images/20220531/20fec71d4526455cbcfffc19215e13f1.png
[0E1F6A16-FEC9-4B57-9D09-C1F268860182.png]: /images/20220531/c298d31d250e4f4fb3e6e78e407f8ca6.png
[http_www.demodashi.com]: http://www.demodashi.com/