ios - 添加CAGradient图层但无法获得渐变效果

Question

这里我使用这段代码来提供渐变效果，但根本没有得到效果。

 CAGradientLayer *layer2 = [CAGradientLayer layer];

 NSArray *gradientColors = [NSArray arrayWithObjects:(id)[self colorWithHexString:@"3eb79d"].CGColor,(id)[self colorWithHexString:@"3fb65c"].CGColor,(id)[self colorWithHexString:@"3cb7da"].CGColor, nil];

  [layer2 setColors:gradientColors];
  [layer2 setFrame:cell.userBackgroundView.layer.frame];
  [cell.userBackgroundView.layer insertSublayer:layer2 atIndex:0];
  cell.userBackgroundView.clipsToBounds = YES;

Answer 1

试试这个

CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame =cell.userBackgroundView.frame;
gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor clearColor] CGColor], (id)[[UIColor blackColor] CGColor], nil];
[cell.userBackgroundView.layer insertSublayer:gradient atIndex:0];