讓自己的UIView有shadow

加一個有shadow的sub view, 只需要在你自訂UIView裡加幾行代碼。

加一個有shadow的sub view, 只需要在你自訂UIView裡加幾行代碼。<br />view plaincopy to clipboardprint?<br /> //turning off bounds clipping allows the shadow to extend beyond the rect of the view<br /> [self setClipsToBounds:NO];<br /> //the colors for the gradient. highColor is at the top, lowColor as at the bottom<br /> UIColor * highColor = [UIColor colorWithWhite:1.000 alpha:1.000];<br /> UIColor * lowColor = [UIColor colorWithRed:0.851 green:0.859 blue:0.867 alpha:1.000];<br /> //The gradient, simply enough. It is a rectangle<br /> CAGradientLayer * gradient = [CAGradientLayer layer];<br /> [gradient setFrame:[self bounds]];<br /> [gradient setColors:[NSArray arrayWithObjects:(id)[highColor CGColor], (id)[lowColor CGColor], nil]];<br /> //the rounded rect, with a corner radius of 6 points.<br /> //this *does* maskToBounds so that any sublayers are masked<br /> //this allows the gradient to appear to have rounded corners<br /> CALayer * roundRect = [CALayer layer];<br /> [roundRect setFrame:[self bounds]];<br /> [roundRect setCornerRadius:6.0f];<br /> [roundRect setMasksToBounds:YES];<br /> [roundRect addSublayer:gradient];<br /> //add the rounded rect layer underneath all other layers of the view<br /> [[self layer] insertSublayer:roundRect atIndex:0];<br /> //set the shadow on the view's layer<br /> [[self layer] setShadowColor:[[UIColor blackColor] CGColor]];<br /> [[self layer] setShadowOffset:CGSizeMake(0, 6)];<br /> [[self layer] setShadowOpacity:1.0];<br /> [[self layer] setShadowRadius:10.0];