Day12 TableViewCell 辅助功能

typedef NS_ENUM(NSInteger, UITableViewCellAccessoryType) {
    UITableViewCellAccessoryNone,                   // don‘t show any accessory view
    UITableViewCellAccessoryDisclosureIndicator,    // regular chevron. doesn‘t track
    UITableViewCellAccessoryDetailDisclosureButton, // info button w/ chevron. tracks
    UITableViewCellAccessoryCheckmark,              // checkmark. doesn‘t track
    UITableViewCellAccessoryDetailButton NS_ENUM_AVAILABLE_IOS(7_0) // info button. tracks
};

//cell.accessoryView = [[UISwitch alloc]init];
    cell.accessoryView = [UIButton buttonWithType:UIButtonTypeContactAdd];

 UIView *iv = [[UIView alloc]init];
    iv.backgroundColor = [UIColor redColor];
    cell.selectedBackgroundView =iv;