iOS 雪花动画与跑马灯

这篇是接着上一篇, 关于动画效果的收集篇, 这篇介绍了跑马灯动画以及下落雪花动画, 请看, 话说最近怎么不在状态呢, 好伤感(囧~).
上一篇 - iOS 仿YY直播心形动画 & 烟花动画

跑马灯效果演示

这里贴出使用代码, 详细请下载Demo查看

下载即用~ 快餐 - -Star鼓励

演示

下载后, 在VC中这样使用, 当然Demo中也有体现

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor blackColor];

XTScrollLabelView *drawMarqueeView  = [[XTScrollLabelView alloc] initWithFrame:CGRectMake(0, 0, 250.f, 20)];
drawMarqueeView.delegate          = self;
drawMarqueeView.marqueeDirection  = FromLeftType;
drawMarqueeView.center            = self.view.center;
[self.view addSubview:drawMarqueeView];
[drawMarqueeView addContentView:[self createLabelWithText:@"夏天是个很好的季节, 而夏天然后是简书的推荐作者, 喜欢分享!"
textColor:[self randomColor]]];
[drawMarqueeView startAnimation];

}

- (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;
}
- (UIColor *)randomColor {

return [UIColor colorWithRed:[self randomValue] green:[self randomValue] blue:[self randomValue] alpha:1];
}
- (CGFloat)randomValue {

return arc4random() % 256 / 255.f;
}
- (void)drawMarqueeView:(XTScrollLabelView *)drawMarqueeView animationDidStopFinished:(BOOL)finished
{
[drawMarqueeView stopAnimation];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[drawMarqueeView addContentView:[self createLabelWithText:[self randomString]
textColor:[self randomColor]]];
[drawMarqueeView startAnimation];
});
}
- (NSString *)randomString {

NSArray *array = @[@"人帅",
@"勤劳",
@"年轻",
@"刻苦",
@"开玩笑",
@"都是我编的, 前面的别跑"];
return array[arc4random() % array.count];
}

演示

</div>

雪花动画代码演示

-- 在ViewDidLoad中这样写, 注释已经很详细

// 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;

pic