//分享按鈕
- (void)createRightBtnsAtNavBar{
    self.shareBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    self.shareBtn.frame = CGRectMake(0, 0, 44.0f, 44.0f);
    [self.shareBtn setImage:[UIImage imageNamed:@"share_btn"] forState:UIControlStateNormal];
    [self.shareBtn addTarget:self action:@selector(onShareBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *shareItem = [[UIBarButtonItem alloc] initWithCustomView:self.shareBtn];
    
    self.ruleBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    self.ruleBtn.frame = CGRectMake(0, 0, 44, 44);
    [self.ruleBtn setTitle:@"規(guī)則" forState:UIControlStateNormal];
    [self.ruleBtn setTintColor:[UIColor redColor]];
    [self.ruleBtn addTarget:self action:@selector(onRuleBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *ruleItem = [[UIBarButtonItem alloc] initWithCustomView:self.ruleBtn];
    self.navigationItem.rightBarButtonItems = @[shareItem, ruleItem];
}

這樣寫的話，規(guī)則的按鈕能加上去，事件也能響應(yīng)，但是規(guī)則兩個(gè)字死活顯示不出來(lái)，所以要改變添加方式如下：

//分享按鈕
- (void)createRightBtnsAtNavBar{
    self.shareBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    self.shareBtn.frame = CGRectMake(0, 0, 44.0f, 44.0f);
    [self.shareBtn setImage:[UIImage imageNamed:@"share_btn"] forState:UIControlStateNormal];
    [self.shareBtn addTarget:self action:@selector(onShareBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *shareItem = [[UIBarButtonItem alloc] initWithCustomView:self.shareBtn];
    
    UIBarButtonItem *ruleItem = [[UIBarButtonItem alloc] initWithTitle:@"規(guī)則" style:UIBarButtonItemStylePlain target:self action:@selector(onRuleBtnClicked:)];
    ruleItem.tintColor = [UIColor blackColor];
    self.navigationItem.rightBarButtonItems = @[shareItem, ruleItem];
}

這樣2句代碼代替了上邊6句代碼，而且毫無(wú)問(wèn)題，bingo