mysql -u root -p

(1).进入/usr/local/mysql/bin,查看此目录下是否有mysql，见pic6。
(2).执行vim ~/.bash_profile
    在该文件中添加mysql/bin的目录，见pic7：
    PATH=$PATH:/usr/local/mysql/bin
添加完成后，按esc，然后输入wq保存。
最后在命令行输入source ~/.bash_profile

SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass')

django-admin.py startproject project-name

python manage.py startapp app-name
或 django-admin.py startapp app-name

python manage.py syncdb
 
注意：Django 1.7.1及以上的版本需要用以下命令
python manage.py makemigrations
python manage.py migrate

python manage.py runserver
 
# 当提示端口被占用的时候，可以用其它端口：
python manage.py runserver 8001
python manage.py runserver 9999
（当然也可以kill掉占用端口的进程）
 
# 监听所有可用 ip （电脑可能有一个或多个内网ip，一个或多个外网ip，即有多个ip地址）
python manage.py runserver 0.0.0.0:8000
# 如果是外网或者局域网电脑上可以用其它电脑查看开发服务器
# 访问对应的 ip加端口，比如 http://172.16.20.2:8000

python manage.py flush

python manage.py createsuperuser
 
# 按照提示输入用户名和对应的密码就好了邮箱可以留空，用户名和密码必填
 
# 修改 用户密码可以用：
python manage.py changepassword username

import Kingfisher
imageView.kf_setImageWithURL(NSURL(string: "http//www.baidu.com.png")!)

在info.plist里加上下面这段
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>
</plist>
去配置一个Dictionary类型的NSAppTransportSecurity 子item是Boolean类型NSAllowsArbitraryLoads value是YES

testImag.kf_setImageWithURL(NSURL(string: "http://your.png")!, placeholderImage: UIImage(named: "mrt"))

let URL = NSURL(string: "http://your.png")!
let resource = Resource(downloadURL: URL, cacheKey: "your_customized_key")
imageView.kf_setImageWithResource(resource)

imageView.kf_setImageWithURL(NSURL(string: "your_image_url")!, placeholderImage: nil, optionsInfo: [.Options: KingfisherOptions.ForceRefresh])

let downloader = KingfisherManager.sharedManager.downloader

// 修改超时时间
downloader.downloadTimeout = 5

let cache = KingfisherManager.sharedManager.cache

// 设置硬盘最大缓存50M ，默认无限
cache.maxDiskCacheSize = 50 * 1024 * 1024
// 设置硬盘最大保存3天 ， 默认1周
cache.maxCachePeriodInSecond = 60 * 60 * 24 * 3

// 获取硬盘缓存的大小
cache.cache.calculateDiskCacheSizeWithCompletionHandler { (size) -> () in      
    println("disk size in bytes: \(size)")
}

//清理内存缓存
cache.clearMemoryCache()

// 清理硬盘缓存，这是一个异步的操作
cache.clearDiskCache()

// 清理过期或大小超过磁盘限制缓存。这是一个异步的操作
cache.cleanExpiredDiskCache()

imageView.kf_setImageWithURL(NSURL(string: "your_image_url")!, 
  placeholderImage: nil, 
  optionsInfo: nil, 
  progressBlock: { (receivedSize, totalSize) -> () in 
  println("Download Progress: \(receivedSize)/\(totalSize)") }, 
  completionHandler: { (image, error, imageURL) -> () in 
  println("Downloaded and set!") 
})

self.navigationController?.navigationBar.hidden = false

//backgroundColor 是最底下的color 
self.navigationController?.navigationBar.backgroundColor = UIColor.redColor()

//barTintColor 是表层颜色
self.navigationController?.navigationBar.barTintColor = UIColor.grayColor()

self.navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName:UIColor.blueColor(),NSFontAttributeName:UIFont(name: "Heiti SC", size: 24.0)!]

//完全隐藏backItem//
self.navigationItem.setHidesBackButton(true, animated: true)

swiftself.navigationController?.navigationBar.tintColor = UIColor.whiteColor()

self.navigationItem.leftBarButtonItem?.setTitleTextAttributes([NSForegroundColorAttributeName:UIColor.blueColor(),NSFontAttributeName: UIFont(name: "Chalkduster", size: 13)!], forState: UIControlState.Normal)

//重新定义backItem，将覆盖原来的BackItem.与storyboard中拖入一个item，效果一样。都是覆盖原来的backitem。

//第一种代码定义方式
self.navigationItem.setLeftBarButtonItem(UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Add, target: self, action: "function"), animated: true)

//第二种代码定义方式 
self.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Add, target: self, action: "function")

//第三种代码定义的方式
self.navigationItem.setLeftBarButtonItem(UIBarButtonItem(title: "<Grandre", style: UIBarButtonItemStyle.Plain, target: self, action: "function"), animated: true)

//将导航栏设置成透明
self.navigationController?.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: UIBarMetrics.Default)
self.navigationController!.navigationBar.shadowImage = UIImage()
self.navigationController?.navigationBar.translucent = true

 	//状态栏高度
 	let statusHeight = UIApplication.shared.statusBarFrame.height
//导航栏高度
  	let navigationHeight = self.navigationController?.navigationBar.frame.size.height

<key>UIViewControllerBasedStatusBarAppearance</key>
<false/>

import UIKit
 
class ViewController: UIViewController {
     
    //隐藏状态栏
    override var prefersStatusBarHidden: Bool {
        return true
    }
  
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

import UIKit

class ViewController: UIViewController,ChangeValueDelegate{
    
    var btn = UIButton()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = UIColor.whiteColor()
        
        btn.setTitle("Change", forState:.Normal)
        btn.backgroundColor = UIColor.blueColor()
        btn.frame = CGRect(x: 100, y: 100, width: 100, height: 50)
        btn.addTarget(self, action: #selector(change), forControlEvents: .TouchUpInside)
        self.view.addSubview(btn)
        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    //    delegate 代理方法
    func changeValue(value: String) {
        
        btn.setTitle(value, forState: .Normal)
        print("value:\(value)")
        
    }
    //  传值
    func change(){
        
        let vc = ChangeValueViewController()
        vc.delegate = self
        self.navigationController?.pushViewController(vc, animated: true)
        
    }
    
}

protocol ChangeValueDelegate {
    
    func changeValue(value:String)
    
}

class ChangeValueViewController: UIViewController {
    
    var delegate:ChangeValueDelegate?
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        self.view.backgroundColor = UIColor.whiteColor()
        
        self.delegate?.changeValue("ok")
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

//获取屏幕大小
var screenBounds:CGRect = UIScreen.mainScreen().bounds
println(screenBounds) //iPhone6输出：（0.0,0.0,375.0,667.0）

frame：相对父视图的坐标和大小（x,y,w,h）
bounds：相对自身的坐标和大小，所以bounds的x和y永远为0（0,0,w,h）
center：相对父视图的中点坐标
transform：控制视图的放大缩小和旋转
superview：获取父视图
subviews：获取所有子视图
alpha：视图的透明度（0.0-1.0）
tag：视图的标志（Int类型，默认等于0），设置后，可以通过viewWithTag方法拿到这个视图
`

func removeFromSuperview()：将视图从父视图中移除
func insertSubview(view:UIView, atIndex index:Int)：指定一个位置插入一个视图，index越小，视图越往下
func exchangeSubviewAtIndex(index1:Int, withSubviewAtIndex index2:Int)：将index1和index2位置的两个视图互换位置
func addSubview(view:UIView)：添加视图到父视图
func insertSubview(view:UIView,belowSubview siblingSubview:UIView)：在指定视图的下面插入视图
func insertSubview(view:UIVIew,aboveSubview siblingSubview:UIView)：在指定视图上面插入视图
func bringSubviewToFront(view:UIView)：把视图移到最顶层
func sendSubviewToBack(view:UIView)：把视图移到最底层
func viewWithTag(tag:Int)->UIView?：根据tag值获取视图