颜色从上到下渐变的View

@class CALayer;

@class CAGradientLayer;

@interface GradientView : UIView

@property(nonatomic, strong, readonly) CAGradientLayer *gradientLayer;

- (void)setColors:(NSArray *)colors;//自己用的时候传一个装有UIColor对象的数组

@end

@implementation GradientView

- (id)init {

    return [selfinitWithFrame:CGRectZero];

}

+ (Class)layerClass {

    return [CAGradientLayerclass];

}

- (CAGradientLayer *)gradientLayer {

    return (CAGradientLayer *)self.layer;

}

- (void)setColors:(NSArray *)colors {

    NSMutableArray *cgColors = [NSMutableArrayarray];

    for (UIColor *colorin colors) {

        [cgColors addObject:(__bridgeid)color.CGColor];

    }

    self.gradientLayer.colors = cgColors;

}

@end