//改变图片颜色
- (UIImage *)imageWithColor:(UIColor *)color
{
UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);
CGContextRefcontext = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(context, 0, self.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);
CGContextSetBlendMode(context, kCGBlendModeNormal);
    CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
    CGContextClipToMask(context, rect, self.CGImage);
    [color setFill];
    CGContextFillRect(context, rect);
UIImage*newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
    return newImage;
}