Swift

Lazy Loading Lazy loading is ubiquitous in IOS development Lazy loading format is as follows: var person: Person = { print("懒加载") return Person()}() Lazy loading is essentially a closed package The

String In the vast majority of cases in Swift, it is recommended to use String type String is a struct with higher performance String currently features most of the NSString String supports direct traversal

The Swift array is used to store a sequential list of values of the same type. Swift is strictly checked to not allow different types of values to be in the same arrayDeclares an arrayvar Somearray ==30)// Declare an array of three capacities with

Optional Optional Types Optionalis a major feature of Swift and the most confusing problem for swift beginners When a variable is defined, the variable is represented if it is specified 可选的可以有一个指定类型的值，也可以是 nil When defining a

Panda Pig • Patty original or translated works. Welcome reprint, Reprint please indicate the source.If you feel that the writing is not good please more advice, if you feel good please support a lot of praise. Thank you! Hopy;) Disclaimer:

3.30 See the video to learn the two-dimensional code simple implementation and some of the implementation of the animation to record the simple implementation of QR code scanning today is not very good to remember the basis of the study is to

I. struct (struct)struct, plainly, is a set of variables that have a uniform name. In swift, not only can we declare variables in a struct and set default values for variables, but we can add corresponding functions in a struct. Next we will create

Log for later lookup. Thank you1 Swift User Guide. PDF Downloadhttp://download.csdn.net/detail/swifttrain/74429212 The Swift programming Language. PDF official manual download PDF versionhttp://download.csdn.net/detail/swifttrain/74428993 The

The contents of this page include: Enumeration syntax (enumeration Syntax) Match an enumeration value with a switch statement (Matching enumeration values with a Switch Statement) Association value (associated values) Original

original articles, welcome reprint. Reprint Please specify: Dongsheng's blog if the necessary header files are introduced, theobjective-clanguage can be used inCThe data type. And inSwiftcannot be used directly in a languageCdata type, Apple

In the previous blog, code refactoring (i): function refactoring rules (Swift version), the refactoring rules for functions are described in detail, including:Extract method, inline method, inline Temp, Replace temp with Query, introduce explaining

original articles, welcome reprint. Reprint Please specify: Dongsheng's blog Swift the properties in are divided into storage properties and computed properties, and the stored properties are objective-c the calculated property does not store data

Get the namespace before you use the classUsing JSON to get the class name of the character type and then create the class object, it is necessary to use the character to turn classGets the namespace from the info dictionary to the character typeLet

original articles, welcome reprint. Reprint Please specify: Dongsheng's blog Use var or is Let ? in the course of our development, when did you define the keyword as var , or is defined as Let it? Actually AH all can satisfy our demand, then how

LanguageUse American English spelling to match Apple's APIPreferred: var color = "Red" is not recommended: var colour = "Red"Interval Use 2 spaces to indent and not tab so you can save space and prevent line breaks. Make sure the settings

Add content to TextContainerOpen Main.storyboard , drag and drop two Label components from the component library (Object Library) into TextContainer, where they can be placed:Select the top label, then click the Align button at the bottom, add a

Import Uikit@uiapplicationmainclassAppdelegate:uiresponder, uiapplicationdelegate {var window:uiwindow?func Application (application:uiapplication, didfinishlaunchingwithoptions launchoptions: [nsobject:anyobject]?) -Bool {Self.window=UIWindow

Import Uikit@uiapplicationmainclassAppdelegate:uiresponder, uiapplicationdelegate {var window:uiwindow?func Application (application:uiapplication, didfinishlaunchingwithoptions launchoptions: [nsobject:anyobject]?) -Bool {Self.window=UIWindow

University, there is a "modern algebra" Professor, he never read textbooks in class, and do not follow the textbook to explain the course, but he speaks more than the book Deep image (humor, eloquence), there is a level of sense, in addition to

Import foundation/* could fail the propagation of the constructor (call) 1. A constructor that might fail can call a generic constructor in the same Class 2. A generic constructor cannot call a possible failure in the same class constructor 3. In a