UIBarButtonItem的创建

1. rightBarButtonItem的创建

-(void)initRightBar{
    UIBarButtonItem *done =[UIBarButtonItem rightItemWithText:@"新建优惠" withTextColor:[UIColor nvColorWithf63] target:self action:@selector(gotoCreateCoupon)];
    self.navigationItem.rightBarButtonItem = done;
}

2. 使用UIButton创建UIBarButtonItem

- (UIBarButtonItem *)creatCouponButtonItem {
    UIButton *creatCouponButton = [[UIButton alloc] initWithFrame:CGRectMake(, , , )];
    [creatCouponButton setTitle:@"新建优惠" forState:UIControlStateNormal];
    [creatCouponButton setTitleColor:[UIColor nvColorWithf63] forState:UIControlStateNormal];
    creatCouponButton.titleLabel.font = [UIFont nvFontWithSize14];
    [creatCouponButton addTarget:self action:@selector(gotoCreateCoupon) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc] initWithCustomView:creatCouponButton];
    return buttonItem;
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