iOS-各种动画特效

发布时间:2017-07-21
技术:Animation

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

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



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


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


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


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


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

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!



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