cellWidth.m

- (CGFloat)cellWidthForStyle:(UITableViewStyle)style accessoryType:(UITableViewCellAccessoryType)accessoryType {
    CGFloat width = self.view.frame.size.width;
    CGFloat accessoryWidth;
    CGFloat margin;
    if (IOS7) {
        if (accessoryType == UITableViewCellAccessoryDisclosureIndicator) {
            accessoryWidth = 33;
        }
    } else {
        if (accessoryType == UITableViewCellAccessoryDisclosureIndicator) {
            accessoryWidth = 20;
        }
        if (width > 20) {
            if (width < 400) {
                margin = 10;
            } else {
                margin = MAX(31, MIN(45, width*0.06));
            }
        } else {
            margin = width - 10;
        }
    }
    return width - (style == UITableViewStyleGrouped ? margin * 2 : 0) - accessoryWidth;
}