CSSwiftExtension是我个人开源的一个非常有用的Swift extension集合。支持CocoadPods和Carthage。
目前主要包含Foundation和UIKit的两类extension，基本使用如下：

Foundation

String extension

let string = " hello 17, this is my city "
let a = string.cs_trimmed
let b = string.cs_length
aNonUTF8String.cs_utf8String

let regExp_email = "^[a-zA-Z0-9]{1,}@[a-zA-Z0-9]{1,}\\.[a-zA-Z]{2,}$"
cs_validateWithRegExp(regExp: regExp_email)

Array extension

[1, 5, 10].cs_sum
["a", "b", "c", "a", "c"].cs_removeDuplicates()

UIKit

UIApplication extension

UIApplication.shared.cs.appVersion
UIApplication.shared.cs.currentViewController

UIColor extension

imageView.backgroundColor = UIColor(hexString: 0x123456, alpha: 0.5)
imageView.backgroundColor = UIColor.cs.random

UIImage extension

guard let image = UIImage(named: "Model.jpg") else { return }
let a = image.cs.imageMirrored
let b = image.cs.imageCropped(bounds: CGRect(x: 0, y: 0, width: 200, height: 200))
let c = image.cs.imageWithNormalOrientation
let d = image.cs.imageRotatedByDegrees(degrees: 90)
let e = image.cs.imageWithCornerRadius(cornerRadius: 100)
let f = image.cs.imageScaledToSize(targetSize: CGSize(width: 300, height: 300), withOriginalRatio: true)
let g = image.cs.wechatShareThumbnail
let h = image.cs.grayScale

// Thanks to https://github.com/bahlo/SwiftGif for gif support
aImageView.loadGif(name: "Railway")
aImageView.image = UIImage.gif(name: "Railway")

UIView extension

imageView.cs.snapShot()
let aView = AView.cs.loadFromNib("AView") as? AView
aView.setCornerRadius(radius: 20)
aView.setCornerRadius(corners: [.bottomLeft, .bottomRight], radius: 20)

UIImageView extension

let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 300, height: 500), blurEffectStyle: .light)

UITableView extension

aTableView.cs.removeEmptyFooter()
aTableView.cs.scrollToTop(animated: true)

tableView.cs_register(MyTableViewCell.self)
let cell = tableView.cs_dequeueReusableCell(forIndexPath: indexPath) as MyTableViewCell

UIButton extension

btnTest.cs_acceptEventInterval = 2 // to avoid UIButton's multiple click operation
btnTest.cs.setBackgroundColor(UIColor.blue, for: .normal) // set backgroundColor
btnTest.cs.setBackgroundColor(UIColor.red, for: .highlighted)

CGPoint extension

aPoint.cs_distance(toPoint: bPoint)
CGPoint.cs_distance(fromPoint: aPoint, toPoint: bPoint)

DispatchQueue extension

DispatchQueue.cs.delay(2) {
    print("delay action")
}
DispatchQueue.cs.global {
    print("global action")
    DispatchQueue.cs.main {
        print("main action")
    }
}