需要幫助才能在iOS4的uiview中將圖像添加到圖像中？

Question

我正在嘗試爲圖像創建投影。我也有意見之間的動畫，這是背景。但是，當我使用下面的代碼時，圖像不繪製。有人有主意嗎？

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

您是否想過使用CALayer的陰影屬性？例如，你可以做到以下幾點：

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

簽出更多的位置：http://developer.apple.com/iphone/library/documentation/GraphicsImaging/Reference/CALayer_class/Introduction/Introduction.html#//apple_ref/occ/instp/CALayer/shadowColor