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一.
1.@interface LMStoreTableViewCell ()
{
CAGradientLayer *_gradientLayer;
}
2.
//1.设置渐变色
_gradientLayer = [CAGradientLayer layer]; // 设置渐变效果
_gradientLayer.frame = self.bottomBgView.bounds;//注意等视图渲染之后再设置frame - (void) layoutSubviews
_gradientLayer.colors = [NSArray arrayWithObjects:
(id)[[UIColor clearColor] CGColor],
(id)[[UIColor blackColor] CGColor], nil];
_gradientLayer.startPoint = CGPointMake(0.0, 0.0);
_gradientLayer.endPoint = CGPointMake(0.0, 1.0);
[self.bottomBgView.layer insertSublayer:_gradientLayer atIndex:0];
二.
主要用到了Layer上的渐变层，核心代码如下，关于CALayer的使用可参考
- - (void) insertTransparentGradient {
- UIColor *colorOne = [UIColor colorWithRed:(33/255.0) green:(33/255.0) blue:(33/255.0) alpha:0.0];
- UIColor *colorTwo = [UIColor colorWithRed:(33/255.0) green:(33/255.0) blue:(33/255.0) alpha:1.0];
- NSArray *colors = [NSArray arrayWithObjects:(id)colorOne.CGColor, colorTwo.CGColor, nil nil];
- NSNumber *stopOne = [NSNumber numberWithFloat:0.0];
- NSNumber *stopTwo = [NSNumber numberWithFloat:1.0];
- NSArray *locations = [NSArray arrayWithObjects:stopOne, stopTwo, nil nil];
-
-
- CAGradientLayer *headerLayer = [CAGradientLayer layer];
-
- headerLayer.colors = colors;
- headerLayer.locations = locations;
- headerLayer.frame = self.bounds;
-
- [self.layer insertSublayer:headerLayer atIndex:0];
- }
-
-
- - (void) insertColorGradient {
-
- UIColor *colorOne = [UIColor colorWithRed:(255/255.0) green:(255/255.0) blue:(255/255.0) alpha:1.0];
- UIColor *colorTwo = [UIColor colorWithRed:(33/255.0) green:(33/255.0) blue:(33/255.0) alpha:1.0];
-
- NSArray *colors = [NSArray arrayWithObjects:(id)colorOne.CGColor, colorTwo.CGColor, nil nil];
- NSNumber *stopOne = [NSNumber numberWithFloat:0.0];
- NSNumber *stopTwo = [NSNumber numberWithFloat:1.0];
-
- NSArray *locations = [NSArray arrayWithObjects:stopOne, stopTwo, nil nil];
- CAGradientLayer *headerLayer = [CAGradientLayer layer];
- headerLayer.colors = colors;
- headerLayer.locations = locations;
- headerLayer.frame = self.bounds;
-
- [self.layer insertSublayer:headerLayer above:0];
-
- }
给view添加渐变色
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原文地址：http://www.cnblogs.com/junhuawang/p/4763722.html
