NSString *starsPath = [[NSBundle mainBundle] pathForResource:@"star" ofType:@"png"];

        UIImage *theImage = [[UIImage alloc] initWithContentsOfFile:starsPath];

        theImage= [theImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

        stars.tintColor = [UIColor orangeColor];

        stars.image = theImage;

通过路径获取图片及改变图片颜色