为View绘制阴影

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关键代码预览:

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   UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 300.0, 225.0)];view.center = self.view.center;view.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin |     UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleBottomMargin;view.layer.contents = (id)[UIImage imageNamed:@"photo.jpeg"].CGImage;view.layer.borderColor = [UIColor colorWithWhite:1.0 alpha:1.0].CGColor;view.layer.borderWidth = 5.0;view.layer.shadowOffset = CGSizeMake(0, 3);view.layer.shadowOpacity = 0.7;view.layer.shouldRasterize = YES;        // shadow    UIBezierPath *path = [UIBezierPath bezierPath];CGPoint topLeft = view.bounds.origin;CGPoint bottomLeft = CGPointMake(0.0, CGRectGetHeight(view.bounds) + 10);CGPoint bottomMiddle = CGPointMake(CGRectGetWidth(view.bounds) / 2, CGRectGetHeight(view.bounds) - 5);CGPoint bottomRight = CGPointMake(CGRectGetWidth(view.bounds), CGRectGetHeight(view.bounds) + 10);CGPoint topRight = CGPointMake(CGRectGetWidth(view.bounds), 0.0);[path moveToPoint:topLeft];[path addLineToPoint:bottomLeft];[path addQuadCurveToPoint:bottomRight controlPoint:bottomMiddle];[path addLineToPoint:topRight];[path addLineToPoint:topLeft];[path closePath];view.layer.shadowPath = path.CGPath;[self.view addSubview:view];