自定义CALayer阴影

最新推荐文章于 2020-04-17 10:26:42 发布

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最新推荐文章于 2020-04-17 10:26:42 发布

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原文链接：http://www.cnblogs.com/sell/archive/2013/02/08/2909411.html

本文介绍了一种在iOS应用中实现带有曲线效果的阴影视图的方法。通过使用UIBezierPath自定义路径，并结合CALayer的shadowPath属性，可以为视图创建平滑过渡的阴影效果。这种方法适用于希望提升用户体验和视觉吸引力的iOS开发者。

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1 CALayer *layer = [[self.view.layer sublayers] objectAtIndex:0];
    layer.shadowPath = (layer.shadowPath) ? nil : [self bezierPathWithCurvedShadowForRect:layer.bounds2 ].CGPath;

 1    static const CGFloat offset = 10.0;
 2    static const CGFloat curve = 5.0;
 3 - (UIBezierPath*)bezierPathWithCurvedShadowForRect:(CGRect)rect {
 4     
 5     UIBezierPath *path = [UIBezierPath bezierPath];    
 6     
 7     CGPoint topLeft         = rect.origin;
 8     CGPoint bottomLeft     = CGPointMake(0.0, CGRectGetHeight(rect) + offset);
 9     CGPoint bottomMiddle = CGPointMake(CGRectGetWidth(rect)/2, CGRectGetHeight(rect) - curve);    
10     CGPoint bottomRight     = CGPointMake(CGRectGetWidth(rect), CGRectGetHeight(rect) + offset);
11     CGPoint topRight     = CGPointMake(CGRectGetWidth(rect), 0.0);
12     
13     [path moveToPoint:topLeft];    
14     [path addLineToPoint:bottomLeft];
15     [path addQuadCurveToPoint:bottomRight controlPoint:bottomMiddle];
16     [path addLineToPoint:topRight];
17     [path addLineToPoint:topLeft];
18     [path closePath];
19     
20     return path;
21 }