Moots

everything is the best arrangement

1、常用代码

银行金额验证

extension String {
    func enteredCorrectly() -> Bool {
        if length == 0 {
            return false
        }
        let scan = NSScanner(string: self)
        let isNotZero = Double(self) > 0
        if isNotZero {
            if containsString(".") {
                if let rangeOfZero = rangeOfString(".", options: .BackwardsSearch) {
                    let suffix = String(characters.suffixFrom(rangeOfZero.endIndex))
                    if suffix.length > 2 {
                        showAlert(controller, message: "您输入的金额有误")
                        return false
                    }
                }
                var float: Float = 0
                guard !(scan.scanFloat(&float) && scan.atEnd) else { return true }
            } else {
                var int: Int64 = 0
                guard !(scan.scanLongLong(&int) && scan.atEnd) else { return true }
            }
        }
        return false
    }
}

多标志符字符串分割

let text = "abc,vfr.yyuu"
let set = CharacterSet(charactersIn: ",.")
print(text.components(separatedBy: set)) // ["abc", "vfr", "yyuu"]

匹配模式

let age = 19
if 18...25 ~= age {
print("条件满足")
}
同
if age >= 18 && age <= 25 {
print("条件满足")
}
同
if case 18...25 = age {
    print("条件满足")
}

单行代码

let arr = (1...1024).map{ $0 * 2 }


let n = (1...1024).reduce(0,combine: +)


let words = ["Swift","iOS","cocoa","OSX","tvOS"]
let tweet = "This is an example tweet larking about Swift"
let valid = !words.filter({ tweet.containsString($0) }).isEmpty
valid //true
let valid2 = words.contains(tweet.containsString)
valid2 //true


// 埃拉托斯特尼筛法
var n = 102
var primes = Set(2...n)
var sameprimes = Set(2...n)
let aa = sameprimes.subtract(Set(2...Int(sqrt(Double(n))))
    .flatMap{(2 * $0).stride(through: n, by:$0)})
let bb = aa.sort()
// bb [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101]


let arr = [82, 58, 76, 49, 88, 90]
let retulst = data.reduce(([], [])) {
    $1 < 60 ? ($0.0 + [$1], $0.1) : ($0.0, $0.1 + [$1])
}
// retulst ([58, 49], [82, 76, 88, 90])

GCD map函数

extension Array {
    public func pmap(transform: (Element -> Element)) -> [Element] {
        guard !self.isEmpty else {
            return []
        }

        var result: [(Int, [Element])] = []

        let group = dispatch_group_create()
        let lock = dispatch_queue_create("pmap queue for result", DISPATCH_QUEUE_SERIAL)

        let step: Int = max(1, self.count / NSProcessInfo.processInfo().activeProcessorCount) // step can never be 0

        for var stepIndex = 0; stepIndex * step < self.count; stepIndex += 1 {
            let capturedStepIndex = stepIndex

            var stepResult: [Element] = []
            dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
                for i in (capturedStepIndex * step)..<((capturedStepIndex + 1) * step) {
                    if i < self.count {
                        let mappedElement = transform(self[i])
                        stepResult += [mappedElement]
                    }
                }

                dispatch_group_async(group, lock) {
                    result += [(capturedStepIndex, stepResult)]
                }
            }
        }

        dispatch_group_wait(group, DISPATCH_TIME_FOREVER)

        return result.sort { $0.0 < $1.0 }.flatMap { $0.1 }
    }
}

extension Array {
    public func pfilter(includeElement: Element -> Bool) -> [Element] {
        guard !self.isEmpty else {
            return []
        }

        var result: [(Int, [Element])] = []

        let group = dispatch_group_create()
        let lock = dispatch_queue_create("pmap queue for result", DISPATCH_QUEUE_SERIAL)

        let step: Int = max(1, self.count / NSProcessInfo.processInfo().activeProcessorCount) // step can never be 0

        for var stepIndex = 0; stepIndex * step < self.count; stepIndex += 1 {
            let capturedStepIndex = stepIndex

            var stepResult: [Element] = []
            dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
                for i in (capturedStepIndex * step)..<((capturedStepIndex + 1) * step) {
                    if i < self.count && includeElement(self[i]) {
                        stepResult += [self[i]]
                    }
                }

                dispatch_group_async(group, lock) {
                    result += [(capturedStepIndex, stepResult)]
                }
            }
        }

        dispatch_group_wait(group, DISPATCH_TIME_FOREVER)

        return result.sort { $0.0 < $1.0 }.flatMap { $0.1 }
    }
}

导航栏标题设置

// 需要tabBarItem的title与导航栏title不一致,如下设置navigationbar的titile
navigationItem.title = "示例"
注意: 直接 title = "示例" 在tabbar切换时tabBarItem的title会变成设置

tabbar隐藏动画

func setTabBarVisible(visible: Bool, animated: Bool) {

//* This cannot be called before viewDidLayoutSubviews(), because the frame is not set before this time

// bail if the current state matches the desired state
if tabBarIsVisible == visible { return }

// get a frame calculation ready
let frame = tabBarController?.tabBar.frame
let height = frame?.size.height
let offsetY = (visible ? -height! : height)

// zero duration means no animation
let duration: NSTimeInterval = (animated ? 0.3 : 0.0)

//  animate the tabBar
if let rect = frame {
UIView.animateWithDuration(duration) {
self.tabBarController?.tabBar.frame = CGRectOffset(rect, 0, offsetY!)
return
}
}
}

var tabBarIsVisible: Bool {
return tabBarController?.tabBar.frame.minY < view.frame.maxY
}

导航栏标返回图片

navigationBar.backIndicatorTransitionMaskImage = R.image.ic_nav_back()
navigationBar.backIndicatorImage = R.image.ic_nav_back()

tableView分割线左边到头(_UITableViewCellSeparatorView)

//写在viewDidLoad
if tableView.respondsToSelector(Selector("setSeparatorInset:")) {
    tableView.separatorInset = UIEdgeInsetsZero
}
if tableView.respondsToSelector(Selector("setLayoutMargins:")) {
    tableView.layoutMargins = UIEdgeInsetsZero
}

//写在 willDisplayCell
if cell.respondsToSelector(Selector("setSeparatorInset:")) {
    cell.separatorInset = UIEdgeInsetsZero
}
if cell.respondsToSelector(Selector("setLayoutMargins:")) {
    cell.layoutMargins = UIEdgeInsetsZero
}

override func layoutSubviews() {
super.layoutSubviews()
separatorInset = UIEdgeInsetsZero
preservesSuperviewLayoutMargins = false
layoutMargins = UIEdgeInsetsZero
}

虚线

func drawDottedLine(lineView: UIView, offset: CGPoint) {
    let shapeLayer = CAShapeLayer()
    shapeLayer.bounds = lineView.bounds
    shapeLayer.position = lineView.layer.position
    shapeLayer.fillColor = nil
    shapeLayer.strokeColor = MOOTS_LINE_GRAY.CGColor
    shapeLayer.lineWidth = 0.5
    shapeLayer.lineJoin = kCALineJoinRound
    // 4=线的宽度 1=每条线的间距
    shapeLayer.lineDashPattern = [NSNumber(int: 4), NSNumber(int: 1)]
    let path = CGPathCreateMutable()
    CGPathMoveToPoint(path, nil, offset.x, offset.y)
    CGPathAddLineToPoint(path, nil, CGRectGetWidth(lineView.frame) - offset.x, offset.y)
    shapeLayer.path = path
    lineView.layer.addSublayer(shapeLayer)
}

部分圆角图片

func cornerImage(frame: CGRect, image: UIImage, Radii: CGSize) -> UIImageView {
    let imageView = UIImageView(image: image)
    imageView.frame = frame
    let bezierPath = UIBezierPath(roundedRect: imageView.bounds, byRoundingCorners: [.TopLeft, .TopRight], cornerRadii: Radii)
    let shapeLayer = CAShapeLayer()
    shapeLayer.path = bezierPath.CGPath
    imageView.layer.mask = shapeLayer
    return imageView
}

圆角图片

extension UIImageView {

    func kt_addCorner(radius radius: CGFloat) {
        self.image = self.image?.kt_drawRectWithRoundedCorner(radius: radius, self.bounds.size)
    }
}

extension UIImage {
    func kt_drawRectWithRoundedCorner(radius radius: CGFloat, _ sizetoFit: CGSize) -> UIImage {
        let rect = CGRect(origin: CGPoint(x: 0, y: 0), size: sizetoFit)

        UIGraphicsBeginImageContextWithOptions(rect.size, false, UIScreen.mainScreen().scale)
        CGContextAddPath(UIGraphicsGetCurrentContext(),
            UIBezierPath(roundedRect: rect, byRoundingCorners: UIRectCorner.AllCorners,
                cornerRadii: CGSize(width: radius, height: radius)).CGPath)
        CGContextClip(UIGraphicsGetCurrentContext())

        self.drawInRect(rect)
        CGContextDrawPath(UIGraphicsGetCurrentContext(), .FillStroke)
        let output = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return output
    }
}

通过字符串构建类

extension String {
    func fromClassName() -> NSObject {
        let className = NSBundle.mainBundle().infoDictionary!["CFBundleName"] as! String + "." + self
        let aClass = NSClassFromString(className) as! UIViewController.Type
        return aClass.init()
    }
}

extension NSObject {
    class func fromClassName(className: String) -> NSObject {
        let className = NSBundle.mainBundle().infoDictionary!["CFBundleName"] as! String + "." + className
        let aClass = NSClassFromString(className) as! UIViewController.Type
        return aClass.init()
    }
}

修改状态栏背景颜色

func setStatusBarBackgroundColor(color: UIColor) {
    guard  let statusBar = UIApplication.sharedApplication().valueForKey("statusBarWindow")?.valueForKey("statusBar") as? UIView else {
        return
    }
    statusBar.backgroundColor = color
}
swift3.0
    func setStatusBarBackgroundColor(color: UIColor) {
        let statusBarWindow = UIApplication.shared.value(forKey: "statusBarWindow") as? UIView
        guard  let statusBar = statusBarWindow?.value(forKey: "statusBar") as? UIView else {
            return
        }
        statusBar.backgroundColor = color
    }

裁剪图片

extension UIImage {
    func cutOutImageWithRect(rect: CGRect) -> UIImage {

        guard let subImageRef = CGImageCreateWithImageInRect(CGImage, rect) else {
            return self
        }
        let smallBounds = CGRect(x: 0, y: 0, width: CGImageGetWidth(subImageRef), height: CGImageGetHeight(subImageRef))
        UIGraphicsBeginImageContext(smallBounds.size)
        let context = UIGraphicsGetCurrentContext()
        CGContextDrawImage(context, smallBounds, subImageRef)
        let smallImage = UIImage(CGImage: subImageRef)
        UIGraphicsEndImageContext()
        return smallImage
    }
}

响应区域太小

extension UIButton {
    //处理button太小
    public override func hitTest(point: CGPoint, withEvent event: UIEvent?) -> UIView? {
        // if the button is hidden/disabled/transparent it can't be hit
        if self.hidden || !self.userInteractionEnabled || self.alpha < 0.01 { return nil }

        // increase the hit frame to be at least as big as `minimumHitArea`
        let buttonSize = bounds.size
        let widthToAdd = max(44 - buttonSize.width, 0)
        let heightToAdd = max(44 - buttonSize.height, 0)
        let method = CGRect.insetBy(bounds)
        let largerFrame = method(dx: -widthToAdd / 2, dy: -heightToAdd / 2)
        // perform hit test on larger frame
        return largerFrame.contains(point) ? self : nil
    }
}

2、笔记

Class

1. UITableView

在UITableViewCell实例上添加子视图，有两种方式：[cell  addSubview:view]或[cell.contentView addSubview:view],一般情况下，两种方式没有区别。但是在多选编辑状态，直接添加到cell上的子视图将不会移动，而添加在contentView上的子视图会随着整体右移。所以，推荐使用[cell.contentView addSubview:view]方式添加子视图。

cell.backgroundColor = [UIColor grayColor];或cell.contentView.backgroudColor = [UIColor grayColor];一般情况下，两种方式效果一样。但是在多选编辑状态，直接设置cell的背景色可以保证左侧多选框部分的背景色与cell背景色一致，而设置contentView背景色，左侧多选框的背景色会是UITableView的背景色或UITableView父视图背景色，如果需要保证颜色一致，必须设置cell的背景色而不是cell.contentView的。

2. iOS事件响应链中Hit-Test View的应用

3.UIButton setImage setBackgroundImage

首先setBackgroundImage，image会随着button的大小而改变，图片自动会拉伸来适应button的大小，这个时候任然可以设置button的title，image不会挡住title；相反的的setImage，图片不会进行拉伸，原比例的显示在button上，此时再设置title，title将无法显示，因此可以根据需求选中方法

4. NSLayoutConstraint Leading left

NSLayoutAttributeLeading/NSLayoutAttributeTrailing的区别是left/right永远是指左右， leading/trailing在某些从右至左习惯的地区（希伯来语等）会变成，leading是右边，trailing是左边

Protocol

delegate一般得用weak标识符，这样当delegate指向的controller被销毁时，delegate会跟着被置为nil，可以有效防止这种问题。 若是使用assign标识的delegate，则注意在delegate指向的对象被销毁时，将delegate 置为nil。 也有不将delegate置为nil，没有问题的情况。如常见的tableView，其delegate和datasource，一般不会在其他controller中使用该tableView，所以不会有这种问题。

Struct

实例方法中修改值类型 结构体和枚举是值类型。默认情况下，值类型的属性不可以在他的实例方法中修改 可以用mutating（变异行为） 注意：不能在结构体类型常量上调用变异方法，因为常量的属性不能被改变，即使想改变的是常量的变量属性也不行

优化

UIKit性能调优实战讲解

UITableView

AsyncDisplayKit教程

使用 ASDK 性能调优 - 提升 iOS 界面的渲染性能

杂

Self 表示引用当前实例的类型

AnyObject可以代表任何class类型的实例

Any可以表示任何类型。除了方法类型（function types）

对于生命周期中会变为nil的实例使用弱引用。相反地，对于初始化赋值后再也不会被赋值为nil的实例，使用无主引用。

3、常用配置

cocoapods

卸载当前版本
sudo gem uninstall cocoapods

下载旧版本
sudo gem install cocoapods -v 0.25.0

修改Xcode自动生成的文件注释来导出API文档

http://www.jianshu.com/p/d0c7d9040c93
open /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/Templates/File\ Templates/Source

删除多余模拟器

open /Library/Developer/CoreSimulator/Profiles/Runtimes
open /Users/你电脑的名字/Library/Developer/Xcode/iOS\ DeviceSupport

修改swift文件

open /Applications/Xcode.app/Contents/Developer/Library/Xcode/Templates/File\ Templates/Source/Swift\ File.xctemplate

open /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/Templates/File\ Templates/Source/Cocoa\ Touch\ Class.xctemplate/UIViewControllerSwift

4、错误处理

1.The certificate used to sign "XXX" has either expired or has been revoked

解决方法

然后

2.解决cocoapods diff: /../Podfile.lock: No such file or directory

解决方法1

解决方法2

5、其他

markdown语法

public podspec

private podspec

podfile 锁定版本

Swift runtime

Xcode快捷键

理解UIView的绘制

切换淘宝源

卸载cocoapods

UI

库名	描述	语言
FontAwesomeKit	各种icon	OC
GSMessages	navigationbar下面出来的提示框	Swift
MobilePlayer	播放器	Swift

数据库

库名	描述	语言
SQLite.swift	数据库	Swift