1.playground 1.1 IntroductionAt the WWDC conference in 2014, Apple officially unveiled swift--'s new programming language for Apple's mobile device software development effort. To match the birth of the new language, Xcode 6 adds a new feature called playgrounds-a set of interactive workspaces where developers can write swift code and get real-time performance feedback without having to run it in a device or simulator. This is undoubtedly a good addition to Xcode, and now you can quickly and easily master real-time performance in an experimental way before you formally add your own code to the main code base.1.2 Hints
- Some of the official learning resources are provided in theplaygroundform of
- Create a file of your ownplaygoundand be able to discover grammar changes the first time each version is upgraded
Enter the Welcome interface interface 2left : code area Right : run result display area I call it: what you see is what you getInterface 3 directly See development effects without compilingfunction : Convenient for beginners to drill quickly, easy to test code 2. First experience, different from OC
| /*syntax : InitializeOC alloc/initwithxxx alloc/initSwift class name (XXX:) () method call Point syntax call method OC: [Uicolor redcolor];Swift:UIColor.redColor enumeration : Oc:uibuttontypecontactadd Swfit:. separate Span style= "font:12.0px ' Heiti SC light '; Font-variant-ligatures:no-common-ligatures; Color: #008400; " > Quick and practical Check the enumeration -> Enter- > Right-click ->. Span style= "font:12.0px ' Heiti SC light '; Font-variant-ligatures:no-common-ligatures; Color: #008400; " > select enum Enumeration . The first half of the section can be omitted Note omitting the first half of the enumeration may not only prompt Swift Language is more concise */ import UIKit var str = "Hello, Playground" Letv =UIView(Frame:cgrectmake (0, 0, 100, 100 v. BackgroundColor = uicolor. Redcolor() let BTN = uibutton< Span style= "font:12.0px Menlo; Font-variant-ligatures:no-common-ligatures; " > (type:. contactadd) btn. center = v. center v. Addsubview(btn) //let image = UIImage (named: "xxxx") |
3. Summary
-
- Not in Swiftmain.m,@UIApplicationMainIt's a program entry.
-
- Only files in Swift.swift, no.h/.mdistinction 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 distinguish between different statements.
- In Swift, it's usually a line of code, so you don't use semicolons
-
-
A quick comparison with OC syntax
- corresponding in OCalloc / init()
- corresponding in OCalloc / initWithXXX(XXX: )
- class function calls in OC, in Swift, directly using the.
- In Swift, the vast majority can be omittedself., the recommendation is generally not written, can improve the understanding of the context (closures will be realized)
- Enumeration types in OC are usedUIButtonTypeContactAdd, while Swift separates, Operation Hotkeys:回车 -> 向右 -> .
- In Swift, the prefix of an enumeration type can be omitted, such as:.ContactAdd, but: many times no smart hints
- Listener method, directly using string to cause
- In Swift, useprint()an alternative in OCNSLog
Comparison of playground and OC syntax in 2.Swift
