UITableViewCell的backgroundColor和backgroundView

// 设置普通背景
UIView *bg = [[UIView alloc] init];
bg.backgroundColor = [UIColor whiteColor];
self.backgroundView = bg;

// 设置选中时的背景
UIView *selectedBg = [[UIView alloc] init];
selectedBg.backgroundColor = MJColor(237, 233, 218);
self.selectedBackgroundView = selectedBg;

cell的backgroundView优先级>backgroundColor

//backgroundView 的优先级 >  backgroundColor
self.tableView.backgroundView = nil;
self.tableView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"bg"]];