Float snowflake animation, float snowflake

Float snowflake animation, float snowflake

The implementation of the snow float Animation:

1. Snowflake images.

2. The snow action is implemented by the view layer, and a falling action is implemented by the view layer.

3. Apply the algorithm to implement the random time, and then create the corresponding snowflake to implement the descent.

 

Some code:

-(Void) ontime {

UIImageView * view;

View = [[UIImageView alloc] initWithImage: [UIImage imageNamed: @ "xuehua.jpg"];

View. alpha = 0.5;

Int x = round (random () % 320 );

Int y = round (random () % 320 );

Int s = round (random () % 15) + 10;

Int sp = 1/round (random () % 100) + 1;

View. frame = CGRectMake (x, y-250, s, s );

[Self. view addSubview: view];

[UIView beginAnimations: nil context: nil];

[UIView setAnimationCurve: UIViewAnimationCurveEaseOut];

[UIView setAnimationDuration: 10 * sp];

View. frame = CGRectMake (x, 500, s, s );

[UIView setAnimationDelegate: self];

[UIView commitAnimations];

}

Address: https://github.com/ChangYulong/SnowDemo