Swift Development Quick Experience

Goal

• Playground Quick experience & learning resources sharing
• Project development quick Experience, understanding Swift BASIC Program Structure

Learning Resources

• Apple Official Blog https://developer.apple.com/swift/blog/
• Apple official Swift 2.0 ebook https://itunes.apple.com/us/book/id1002622538
• 2.0 Chinese Version http://wiki.jikexueyuan.com/project/swift/
• 100 Essential tips for swift, author Wang Wei, suggest buying an e-book http://onevcat.com

One, Playground

• Playground is a new feature introduced by XCDE 6
• Create a project to write and run programs that are designed to compile and publish programs
• The purpose of using Playground is to:
  • Learning Code
  • Experiment Code
  • Test code
• and can visually see the results of the operation
• In addition, using Playground requires only one file, without the need to create a complex project

Quick Experience

let btn = UIButton(type: UIButtonType.ContactAdd)let view = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))view.backgroundColor = UIColor.lightGrayColor()btn.center = view.centerview.addSubview(btn)print(view)print(view.subviews)

Tips

• Some of the official learning resources are provided in the playground form of
• Create a file of your own playgound and be able to discover grammar changes the first time each version is upgraded

Second, the project development experience objectives

• Familiar with Swift's basic development environment
• Make a simple comparison with OC development

Code implementation

ClassViewcontroller:Uiviewcontroller {OverrideFuncViewdidload() {Super.viewdidload ()In Swift () instead of alloc/init in OCLet V =UIView (frame:CGRect (x:0, y: 20, Width: 100, Height: 100)) //[Uicolor redcolor]; v.backgroundcolor = uicolor.redcolor () //button let btn = Span class= "Hljs-type" >uibutton (type:.  Contactadd) V.addsubview (BTN) //monitoring method Btn.addtarget (self, Action:  "click:", forControlEvents:.  Touchupinside) View.addsubview (v)} func click (Btn:uibutton) {print ( "point me up \ (BTN)")}}         

Summary

• Not in Swift main.m , @UIApplicationMain It's a program entry.
• Only files in Swift .swift , no .h/.m distinction between files
• In Swift, a class is enclosed in a pair {} , with no @implementation@end

• There is no semicolon at the end of each statement, and in other languages, semicolons are used to differentiate between statements, in Swift, which is usually a line of code, so you do not use semicolons

• A quick comparison with OC syntax

  • corresponding in OC alloc / init()
  • corresponding in OC alloc / initWithXXX(XXX: )
  • class function calls in OC, in Swift, directly using the.
  • In Swift, the vast majority can be omitted self. , the recommendation is generally not written, can improve the understanding of the context (closures will be realized)
  • Enumeration types in OC are used UIButtonTypeContactAdd , while Swift separates, Operation Hotkeys: 回车 -> 向右 -> . in Swift, the prefixes of enum types can be omitted, such as: .ContactAdd , but: many times no smart hints
  • Listener method, directly using string to cause
  • In Swift, use print() an alternative in OCNSLog

Swift Development Quick Experience