UITableViewCell 背景色 渐变

In -tableView:cellForRowAtIndexPath:

cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"postCellBackground.png"]];
cell.selectedBackgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"postCellBackgroundSelected.png"]];

Pretty simple, really: PNG images in a UIImageView as the cell's background views.

The two images are 1x61 vertical gradients that UIKit automatically stretches horizontally to fit the width of the cell.