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AdvancedGraphics/AdvancedGraphics/Assets.xcassets/snowflake.imageset/Contents.json
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,21 @@ | ||
| { | ||
| "images" : [ | ||
| { | ||
| "idiom" : "universal", | ||
| "scale" : "1x" | ||
| }, | ||
| { | ||
| "idiom" : "universal", | ||
| "filename" : "snowflake.png", | ||
| "scale" : "2x" | ||
| }, | ||
| { | ||
| "idiom" : "universal", | ||
| "scale" : "3x" | ||
| } | ||
| ], | ||
| "info" : { | ||
| "version" : 1, | ||
| "author" : "xcode" | ||
| } | ||
| } |
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AdvancedGraphics/AdvancedGraphics/Assets.xcassets/snowflake.imageset/snowflake.png
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| @@ -0,0 +1,16 @@ | ||
| // | ||
| // SnowViewController.h | ||
| // AdvancedGraphics | ||
| // | ||
| // Created by Benjamin Sandofsky on 8/7/15. | ||
| // Copyright © 2015 Chroma Noir LLC. All rights reserved. | ||
| // | ||
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| #import <UIKit/UIKit.h> | ||
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| @interface SnowViewController : UIViewController | ||
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| @end | ||
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| @interface SnowLayer : CALayer | ||
| @end |
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| // | ||
| // SnowViewController.m | ||
| // AdvancedGraphics | ||
| // | ||
| // Created by Benjamin Sandofsky on 8/7/15. | ||
| // Copyright © 2015 Chroma Noir LLC. All rights reserved. | ||
| // | ||
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| #import "SnowViewController.h" | ||
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| #define SNOW_COUNT 20 | ||
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| @interface SnowViewController () | ||
| @property (nonatomic, strong) NSMutableArray<SnowLayer *> *snowQueue; | ||
| @end | ||
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| @implementation SnowViewController | ||
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| - (void)viewDidLoad | ||
| { | ||
| [super viewDidLoad]; | ||
| NSMutableArray<SnowLayer *> *array = [NSMutableArray array]; | ||
| UIImage *snowFlakeImage = [UIImage imageNamed:@"snowflake"]; | ||
| for (int i = 0; i < SNOW_COUNT; i++){ | ||
| SnowLayer *snow = [[SnowLayer alloc] init]; | ||
| snow.contents = (id)snowFlakeImage.CGImage; | ||
| snow.frame = CGRectMake(0, -40, 40, 40); | ||
| [self.view.layer addSublayer:snow]; | ||
| [array addObject:snow]; | ||
| } | ||
| self.snowQueue = array; | ||
| } | ||
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| - (IBAction)didTapStart:(UIBarButtonItem *)sender { | ||
| [CATransaction begin]; | ||
| [CATransaction setAnimationDuration:2.0]; | ||
| CGFloat offset = 0.0; | ||
| for (SnowLayer *snow in self.snowQueue) { | ||
| CABasicAnimation *animation = [CABasicAnimation animation]; | ||
| CGFloat x = (CGFloat)arc4random() / (CGFloat)UINT32_MAX * self.view.layer.bounds.size.width; | ||
| CGPoint p = CGPointMake(x, -20.0); | ||
| animation.fromValue = [NSValue valueWithCGPoint:p]; | ||
| animation.keyPath = @"position"; | ||
| p.y = self.view.frame.size.height + 20.0; | ||
| animation.toValue = [NSValue valueWithCGPoint:p]; | ||
| CGFloat randomOffset = (CGFloat)arc4random() / (CGFloat)UINT32_MAX; | ||
| offset += 0.5 + randomOffset / 2.0; | ||
| animation.beginTime = CACurrentMediaTime() + offset; | ||
| animation.repeatCount = 1000; | ||
| [snow addAnimation:animation forKey:@"snowFall"]; | ||
| NSLog(@"Snowed: %f", x); | ||
| } | ||
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| [CATransaction commit]; | ||
| } | ||
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| @end | ||
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| @implementation SnowLayer | ||
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| @end |