突然心血来潮, 整理一些动画特效! 其实是今天一个朋友问我们之前项目里写过的跑马灯还有 Demo 没, 由于比较懒, 不想在项目里再找我就重新写了 Demo. 嘿嘿~
动画特效
- 广播跑马灯
- 弹幕动画
- 直播点赞动画
- 直播点赞图片动画
- 烟花动画
- 雪花动画
一. 广播动画特效:
广播跑马灯.gif
- 初始化广播视图
- 设置广播公告广告内容
- 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");
}
二. 弹幕动画特效:
弹幕动画.gif
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
#import
@class ZLScrollLabelView;
typedef NS_ENUM(NSInteger, ScrollDirectionType) {
FromLeftType = 0,
FromRightType = 1
};
@protocol ZLScrollLabelViewDelegate
// 可选择的
@optional
- (void)barrageView:(ZLScrollLabelView *)barrageView animationDidStopFinished:(BOOL)finished;
@end
@interface ZLScrollLabelView : UIView
// 代理协议
@property (nonatomic, weak) id 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
#import "ZLScrollLabelView.h"
@interface ZLScrollLabelView () {
CGFloat _width;
CGFloat _height;
CGFloat _animationViewWidth;
CGFloat _animationViewHeight;
BOOL _stoped;
UIView *_contentView;
}
@property (nonatomic, strong) UIView *animationView;
@end
- (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
- (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
- (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
- (void)pauseAnimation {
[self pauseLayer:self.animationView.layer];
}
// 恢复
- (void)resumeAnimation {
[self resumeLayer:self.animationView.layer];
}
- (void)pauseLayer:(CALayer*)layer {
CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];
layer.speed = 0.0;
layer.timeOffset = pausedTime;
}
- (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;
}
@end
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];
}
#pragma mark -
- (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];
}
#pragma mark - 产生随机色
- (UIColor *)randomColor {
return [UIColor colorWithRed:arc4random() % 256 / 255.f green:arc4random() % 256 / 255.f blue:arc4random() % 256 / 255.f alpha:1];
}
三. 直播点赞效果:
直播点赞动画.gif
先自定义ZLLiveHeartView,露出liveHeartAnimateInView方法:
@interface ZLLiveHeartView ()
@property (nonatomic, strong) UIColor *strokeColor;
@property (nonatomic, strong) UIColor *fillColor;
@end
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
_strokeColor = [UIColor whiteColor];
_fillColor = [UIColor colorWithRed:(arc4random_uniform(255))/255.0 green:(arc4random_uniform(255))/255.0 blue:(arc4random_uniform(255))/255.0 alpha:1];
self.backgroundColor = [UIColor clearColor];
self.layer.anchorPoint = CGPointMake(0.5, 1);
}
return self;
}
- (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];
}
四.直播图片点赞动画
直播点赞图片动画.gif
先自定义ZLLikeAnimation,露出animatePictureInView方法:
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.imageView = [[UIImageView alloc] initWithFrame:frame];
[self addSubview:self.imageView];
}
return self;
}
- (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]]];
}
五. 烟花特效:
烟花效果.gif
/**
* 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];
}
六. 雪花特效:
雪花效果.gif
/**
* 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;
}
持续更新添加动画特效~
贴上 Demo , 如果需要直接这里下载就可以喽~