OC 添加导航栏item

 

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/**  * 设定右侧按钮方法  */ - (void)createMakeBtn{     UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 70, 40)];     button.backgroundColor = UIColor.systemGreenColor;     self.makeBtn = button;     button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;     [button.titleLabel setFont:[UIFont systemFontOfSize:14 weight:(UIFontWeightRegular)]];     [button addTarget:self action:@selector(clickMakeBtn) forControlEvents:UIControlEventTouchUpInside];     button.userInteractionEnabled = NO;     button.showsTouchWhenHighlighted = NO;     ///显示的item     UIBarButtonItem * item = [[UIBarButtonItem alloc] initWithCustomView:button];     ///间距     UIBarButtonItem *fixItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];     self.navigationItem.rightBarButtonItems = @[fixItem, item];           [self updateCreateBtnStatus]; }   /// 更新制作按钮的显示状态 - (void)updateCreateBtnStatus{     if (self.selectedAssetArr.count > 0) {         self.makeBtn.backgroundColor = UIColor.blueColor;         self.makeBtn.userInteractionEnabled = YES;     }else{         self.makeBtn.backgroundColor = UIColor.grayColor;         self.makeBtn.userInteractionEnabled = NO;     }     NSString *selectedStr = [NSString stringWithFormat:@"制作(%lu/%d)", (unsigned long)self.selectedAssetArr.count, self.maxSelectedPic];     [self.makeBtn setTitle:selectedStr forState:(UIControlStateNormal)]; }