添加渐变色

• (UIImageView)smallBackgroundImageView {
  if(!_smallBackgroundImageView)
  {
  _smallBackgroundImageView = [[UIImageView alloc] initWithFrame:CGRectMake(12,FULL_WIDTH207/375+5+147.5+10, FULL_WIDTH-12*2, (FULL_WIDTH-24)*90/351)];
  [_smallBackgroundImageView addCornerWithCornerRadius:20.0/2];
  _smallBackgroundImageView.backgroundColor = [UIColor clearColor];

  CAGradientLayer *gradientLayer = [CAGradientLayer layer];
  gradientLayer.colors = @[(__bridge id)((BGColorHex(F7391F)).CGColor), (__bridge id)((BGColorHex(FE6B56)).CGColor)];
  gradientLayer.startPoint = CGPointMake(0.5, 0);
  gradientLayer.endPoint = CGPointMake(0.5, 1);
  gradientLayer.frame = CGRectMake(0, 0, FULL_WIDTH-12*2, (FULL_WIDTH-24)*90/351);
  
  [_smallBackgroundImageView.layer addSublayer:gradientLayer];

}
return _smallBackgroundImageView;
}