?通過(guò)QuartzCore框架下的CAEmitterLayer可以輕松實(shí)現(xiàn)玫瑰花漫天飛舞的動(dòng)畫(huà)

?實(shí)現(xiàn)代碼如下：

- (void)viewDidLoad {

? ? [super viewDidLoad];

?? ?

? ? CAEmitterLayer *snowEmitter = [CAEmitterLayer layer];

?

snowEmitter.emitterPosition = CGPointMake(self.view.bounds.size.width / 2.0, -30);

snowEmitter.emitterSize? = CGSizeMake(self.view.bounds.size.width * 2.0, 0.0);

snowEmitter.emitterShape = kCAEmitterLayerLine;

snowEmitter.emitterMode? = kCAEmitterLayerOutline;

?

CAEmitterCell *snowflake = [CAEmitterCell emitterCell];

?? ?

? ? snowflake.birthRate = 10.0;

? ? snowflake.lifetime = 120;

? ? snowflake.velocity = 20;

? ? snowflake.velocityRange = 10;

? ? snowflake.yAcceleration = 10;

? ? snowflake.emissionRange = 0.5 * M_PI;

? ? snowflake.spinRange = 0.25 * M_PI;

? ? snowflake.contents? = (id) [[UIImage imageNamed:@"rose"] CGImage];

//? ? snowflake.color = [[UIColor colorWithRed:0.600 green:0.658 blue:0.743 alpha:1.000] CGColor];

? ? snowEmitter.shadowOpacity = 1.0;

? ? snowEmitter.shadowRadius? = 0.0;

? ? snowEmitter.shadowOffset? = CGSizeMake(0.0, 1.0);

? ? snowEmitter.shadowColor ? = [[UIColor whiteColor] CGColor];

? ? snowEmitter.emitterCells = [NSArray arrayWithObject:snowflake];

? ? [self.view.layer insertSublayer:snowEmitter atIndex:0];

}

轉(zhuǎn)載于:https://www.cnblogs.com/adwardWang/p/5996762.html

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