怎么在NavigationBar加left，这些控件本身只能在固定位置上
写入代码
UIImage* backImage = [UIImage imageNamed:@"nav_order_more"];
CGRect backframe = CGRectMake(0,0,30,8);
UIButton* backButton= [[UIButton alloc] initWithFrame:backframe];
[backButton setBackgroundImage:backImage forState:UIControlStateNormal];
backButton.titleLabel.font=[UIFont systemFontOfSize:13];
[backButton addTarget:self action:@selector(doClickBackAction) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem* setRightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.rightBarButtonItem = setRightBarButtonItem;
-
UIImage -> UIButton -> UIBarButtonItem -> self.navigationItem(逻辑)
- UIBarButtonItem 是一个类
- 通过
initWithCustomView方法，实现UIButton -> UIBarButtonItem
怎么在navigationBar加个 Center,这些控件本身只能在固定位置上
JRSegmentControl *segment = [[JRSegmentControl alloc] initWithFrame:CGRectMake(0, 0, self.itemWidth * self.viewControllers.count, self.itemHeight) titles:self.titles];
segment.backgroundColor = self.segmentBgColor;
segment.indicatorViewColor = self.indicatorViewColor;
segment.delegate = self;
self.navigationItem.titleView = segment;
-
JRSegmentControl -> self.navigationItem.titleView
- 通过赋值的方式 self.navigationItem.titleView = segment;
如何在navigationBar在任意位置加控件
UISegmentedControl * contorl = [[UISegmentedControl alloc] initWithItems:@[@"全部",@"待收货",@"待评价"]];
contorl.frame = CGRectMake([UIScreen mainScreen].bounds.size.width/2-150/2, 2, 150, 40);
[contorl addTarget:self action:@selector(clickSegment:) forControlEvents:UIControlEventValueChanged];
//默认选择为第一个
contorl.selectedSegmentIndex = 0;
[self.navigationController.navigationBar addSubview:contorl];
UISegmentedControl -> self.navigationController.navigationBar
-
通过addSubView的方式
- [self.navigationController.navigationBar addSubview:contorl];
总结：导航栏上只能加UIBarButtonItem，不能直接加控件
