- (void)setBackgroundColorWithButton:(UIButton *)button  firstColor:(UIColor *)firstColor lastColor:(UIColor *)lastColor{CAGradientLayer *gradientLayer = [[CAGradientLayer alloc] init];gradientLayer.colors = @[(__bridge id)firstColor.CGColor,(__bridge id)lastColor.CGColor];gradientLayer.startPoint = CGPointMake(0, 0);gradientLayer.endPoint = CGPointMake(0, 1);gradientLayer.frame = CGRectMake(0, 0, CGRectGetWidth(button.frame), CGRectGetHeight(button.frame));[button.layer addSublayer:gradientLayer];
}

UIColor *firstColor = [UIColor colorWithRed:(128/256.0) green:(215/256.0) blue:(4/256.0) alpha:1];UIColor *lastColor = [UIColor colorWithRed:(41/256.0) green:(129/256.0) blue:(1/256.0) alpha:1];[self setBackgroundColorWithButton:_myButton1 firstColor:firstColor lastColor:lastColor];

-(UIImage*) circleImage:(UIImage*) image withParam:(CGFloat) inset {//UIGraphicsBeginImageContext(image.size);//解决失真 模糊的问题
    UIGraphicsBeginImageContextWithOptions(image.size, NO, [[UIScreen mainScreen] scale]);CGContextRef context =UIGraphicsGetCurrentContext();//圆的边框宽度为2，颜色为红色
    CGContextSetLineWidth(context,2);CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);CGRect rect = CGRectMake(inset, inset, image.size.width - inset *2.0f, image.size.height - inset *2.0f);CGContextAddEllipseInRect(context, rect);CGContextClip(context);//在圆区域内画出image原图
    [image drawInRect:rect];CGContextAddEllipseInRect(context, rect);CGContextStrokePath(context);//生成新的image
    UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return newimg;}