[英]iOS: Draw shadow within UIView
我找到了一些很棒的代碼,它是UIView
的子類,它用陰影繪制該視圖。 然后,我可以在要放置陰影的任何地方使用該視圖:
-(void) layoutSubviews {
CGFloat coloredBoxMargin = 40;
CGFloat coloredBoxHeight = self.frame.size.height;
_coloredBoxRect = CGRectMake(coloredBoxMargin, 0, 40, coloredBoxHeight);
}
-(void) drawRect:(CGRect)rect {
CGColorRef lightColor = [UIColor colorWithRed:105.0f/255.0f green:179.0f/255.0f blue:216.0f/255.0f alpha:0.8].CGColor;
CGColorRef shadowColor = [UIColor colorWithRed:0.2 green:0.2 blue:0.2 alpha:0.4].CGColor;
CGContextRef context = UIGraphicsGetCurrentContext();
// Draw shadow
CGContextSaveGState(context);
CGContextSetFillColorWithColor(context, lightColor);
CGContextSetShadowWithColor(context, CGSizeMake(-13, 0), 10, shadowColor);
CGContextFillRect(context, _coloredBoxRect);
CGContextRestoreGState(context);
}
使用以下內容創建:
UIViewWithShadowRight* verticalLineView2 = [[[UIViewWithShadowRight alloc] initWithFrame:CGRectMake(60, 0, 40 , self.view.frame.size.height)] autorelease];
[verticalLineView2 setBackgroundColor:[UIColor clearColor]];
[verticalLineView2 setAutoresizingMask:UIViewAutoresizingFlexibleHeight];
[verticalLineView2 setClipsToBounds:NO];
[self.view addSubview:verticalLineView2];
[self.view bringSubviewToFront:verticalLineView2];
問題是,陰影是從右向左繪制的,我該如何反轉並從左向右繪制呢?
使13
正而不是負。 這是繪制陰影的x偏移,負值在原始圖形的左側,正值在右側。
嘗試更改此CGContextSetShadowWithColor(context,CGSizeMake(-13,0),10,shadowColor); 將當前的x值(-13)替換為右側的值。
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