UINavigationController一些知识点

一.控制器进栈、出栈生命周期

---

rootViewController 导航控制器的根控制器#import "RootController.h"

  - (void)viewDidLoad {
[super viewDidLoad];  
  YMLogFunc; 
}

-(void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];
YMLogFunc;
}

-(void)viewDidAppear:(BOOL)animated{

[super viewDidAppear:animated];
YMLogFunc;
}

-(void)viewWillDisappear:(BOOL)animated{

[super viewWillDisappear:animated];
YMLogFunc;
}

-(void)viewDidDisappear:(BOOL)animated{

[super viewDidDisappear:animated];
YMLogFunc;
}

---

第二次进栈的控制器#import "SecondController.h"

- (void)viewDidLoad {
[super viewDidLoad];
YMLogFunc;

}

-(void)viewWillAppear:(BOOL)animated{

[super viewWillAppear:animated];
YMLogFunc;
}

-(void)viewDidAppear:(BOOL)animated{

[super viewDidAppear:animated];
YMLogFunc;
}

-(void)viewWillDisappear:(BOOL)animated{

[super viewWillDisappear:animated];
YMLogFunc;
}

-(void)viewDidDisappear:(BOOL)animated{

[super viewDidDisappear:animated];
YMLogFunc;
}

---

首先看看当SecondController进栈后各种方法打印的顺序

2016-08-04 13:58:09.726 导航栏颜色[1521:104741] -[RootController viewDidLoad]
2016-08-04 13:58:09.726 导航栏颜色[1521:104741] -[RootController viewWillAppear:]
2016-08-04 13:58:09.735 导航栏颜色[1521:104741] -[RootController viewDidAppear:]
##2016-08-04 13:58:11.915 导航栏颜色[1521:104741] -[RootController viewWillDisappear:]
2016-08-04 13:58:11.971 导航栏颜色[1521:104741] -[SecondController viewDidLoad]
2016-08-04 13:58:11.971 导航栏颜色[1521:104741] -[SecondController viewWillAppear:]
## 2016-08-04 13:58:12.489 导航栏颜色[1521:104741] -[RootController viewDidDisappear:]
##2016-08-04 13:58:12.490 导航栏颜色[1521:104741] -[SecondController viewDidAppear:]

看看做标记的红色部分，在看看上一条和下一条。

再来看看当SecondController出栈各种方法打印的顺序

2016-08-04 14:04:02.922 导航栏颜色[1521:104741] -[SecondController viewWillDisappear:]
2016-08-04 14:04:02.922 导航栏颜色[1521:104741] -[RootController viewWillAppear:]
2016-08-04 14:04:03.424 导航栏颜色[1521:104741] -[SecondController viewDidDisappear:]
2016-08-04 14:04:03.424 导航栏颜色[1521:104741] -[RootController viewDidAppear:]

这里我就不多说了，RootController已经在栈里面，所以不会有viewDidLoad

---

二.常用的知识点总结

---

1.常用知识点

---

//设置导航栏颜色

self.navigationController.navigationBar.barTintColor = [UIColor greenColor];

//设置中间显示的标题

self.navigationItem.title = @"导航栏";

//self.title = @"导航栏"; 大家可以试试这个，结果怎么样自己试试，多动手，记得看看tabbaritem

//设置标题的属性，包括颜色，字体大小

NSMutableDictionary *attr = [NSMutableDictionary dictionary];


attr[NSFontAttributeName] = [UIFont systemFontOfSize:20];

attr[NSForegroundColorAttributeName] = [UIColor redColor];

self.navigationController.navigationBar.titleTextAttributes = attire;

526C2301-FA78-466A-890A-126FCD8DBFDD.png

  //标题上面的图片

self.navigationItem.titleView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"图片名字"]];

//背景图片

[self.navigationController.navigationBar setBackgroundImage: forBarMetrics:];


//注意点：按照设置的顺序从左边开始设置
self.navigationItem.leftBarButtonItem;

self.navigationItem.leftBarButtonItems;

//注意点：按照设置的顺序从右边开始设置
self.navigationItem.rightBarButtonItem;
self.navigationItem.rightBarButtonItems;

2.容易被忽视，但是很重要的知识点

---

    //当tableView和scrollerView从导航栏下方开始设置时，用这句话。取消系统的自动设置，改为自己动手设置

    self.automaticallyAdjustsScrollViewInsets = NO;

    //向上滑动视图，导航栏将会隐藏，向下将会出现。这个方法大家可以自己有scrollerView代理方法写，我曾经就写过。当然最好用系统的，知道原理就好

    self.navigationController.hidesBarsOnSwipe = YES;

    //去掉导航栏下方的划线，大家可以试试
    [self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];

    [self.navigationController.navigationBar setShadowImage:[UIImage new]];

这个方法不得不提，谁用谁知道，可以截取push controller从中可以干很多的事情

-(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{

if (self.viewControllers.count > 0) {
    
    viewController.hidesBottomBarWhenPushed = YES;在push的时候隐藏tabbar
    
}

[super pushViewController:viewController animated:animated];

}

自定义导航栏左右两边的点击按钮

  UIButton*back = [UIButton buttonWithType:UIButtonTypeCustom];
    
    back.size = CGSizeMake(70, 30);
    
    [back setTitle:@"返回" forState:UIControlStateNormal];
    
    [back setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    
    [back setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
    
    [back setImage:[UIImage imageNamed:@"图片名"] forState:UIControlStateNormal];
    
    [back setImage:[UIImage imageNamed:@"图片名"] forState:UIControlStateHighlighted];
    
    [back addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
    
    back.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;

    back.contentEdgeInsets  = UIEdgeInsetsMake(0, -10, 0, 0);
    //自定义的view作为buttonItem
    viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:back];

引用

http://www.jianshu.com/p/d0f354aa4d0d
http://www.jianshu.com/p/fff775bed8d9
http://www.jianshu.com/p/55ca07d7e543