iOS开发：获取矩形渐变色的UIImage

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/** *  获取矩形的渐变色的UIImage(此函数还不够完善) * *  @param bounds       UIImage的bounds *  @param colors       渐变色数组，可以设置两种颜色 *  @param gradientType 渐变的方式：0--->从上到下   1--->从左到右 * *  @return 渐变色的UIImage */- (UIImage*)gradientImageWithBounds:(CGRect)bounds andColors:(NSArray*)colors andGradientType:(int)gradientType{    NSMutableArray *ar = [NSMutableArray array];        for(UIColor *c in colors) {        [ar addObject:(id)c.CGColor];    }    UIGraphicsBeginImageContextWithOptions(bounds.size, YES, 1);    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextSaveGState(context);    CGColorSpaceRef colorSpace = CGColorGetColorSpace([[colors lastObject] CGColor]);    CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (CFArrayRef)ar, NULL);    CGPoint start;    CGPoint end;        switch (gradientType) {        case 0:            start = CGPointMake(0.0, 0.0);            end = CGPointMake(0.0, bounds.size.height);            break;        case 1:            start = CGPointMake(0.0, 0.0);            end = CGPointMake(bounds.size.width, 0.0);            break;    }    CGContextDrawLinearGradient(context, gradient, start, end, kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    CGGradientRelease(gradient);    CGContextRestoreGState(context);    CGColorSpaceRelease(colorSpace);    UIGraphicsEndImageContext();    return image;}
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