需要帮助在 iOS4 中的 uiview 中向图像添加阴影吗？
我正在尝试为图像创建阴影。我在视图之间也有一个动画，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);
I am trying to create a drop shadow for an image. I also have an animation between views and this is the backdrop. However, when I use the following code, the image is not drawn. Anyone have any ideas?
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);
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您是否考虑过使用 CALayer 的影子属性？例如，您可以执行以下操作：
在此处查看更多信息： http://developer.apple.com/iphone/library/documentation/GraphicsImaging/Reference/CALayer_class/Introduction/Introduction.html#//apple_ref/occ/instp /CALayer/shadowColor
Have you thought about using CALayer's shadow properties? For example you could do the following:
Check out more here: http://developer.apple.com/iphone/library/documentation/GraphicsImaging/Reference/CALayer_class/Introduction/Introduction.html#//apple_ref/occ/instp/CALayer/shadowColor