Question

我正在尝试为图像创建投影。我还在视图之间有动画，这是背景。但是，当我使用以下代码时，不会绘制图像。有人有什么想法吗？

self.frontViewBackground = [[[UIView alloc] initWithFrame:frame] autorelease];
//self.frontViewBackground.image = [UIImage imageNamed:@"whitepaper3.png"];
self.frontViewBackground.multipleTouchEnabled = YES;
[self.photoView addSubview:self.frontViewBackground];

UIImage *image = [UIImage imageNamed:@"whitepaper3.png"]; 

CGContextRef ctx = UIGraphicsGetCurrentContext();

CGContextSetShadow(ctx, CGSizeMake(1, -2), 3.0);
[image drawInRect:self.frontViewBackground.frame blendMode:kCGBlendModeNormal alpha:1.0];
CGContextRestoreGState(ctx);

Answer 1

您是否考虑过使用CALayer的阴影属性？例如，您可以执行以下操作：

UIView *view = [[UIView alloc] initWithFrame:frame];
view.layer.shadowColor = [[UIColor blackColor] CGColor];
view.layer.shadowRadius = 5.0

点击此处了解更多信息：http://developer.apple.com/iphone/library/documentation/GraphicsImaging/Reference/CALayer_class/Introduction/Introduction.html#//apple_ref/occ/instp/CALayer/shadowColor

需要帮助在iOS 4的uiview中为图像添加阴影？

1 个答案: