Swift

A type definition in Swift is called an optional value, plus one after the variable type. You can define a variable of type optional value and use a forced unpacking when using a variable!.If there is an optional box on the page to enter the age,

reprint Please declare source: http://blog.csdn.net/jinnchang/article/details/44802019------------------------------------------------------------------------------------------Overview------------------------------------------------------------------

Switch structure in 11.swiftDifference One:Switch condition in OC can only put integersThe switch condition in Swift can put almost any data typeDifference Two:There should be a break in each case in OC, and if there is no break, it will continue

reprint Please declare source: http://blog.csdn.net/jinnchang/article/details/444071931. UIButton Overviewinheritance: Uiswitch, Uicontrol, UIView2. Control style3. Examples of Usevar Mybutton:uibutton?var myswitch:uiswitch?override func viewdidload

Array CollectionBasic operations:Array Collection definition: A collection of elements of the same type that are ordered by a sequenceBasic declaration of an array:1, var strudentlist:array; Declares a strudentlist array, the type of the array

1, the concept of function overloadingOverloading of functions means that multiple functions have different parameters or return value types that have the same name, and they become overloaded relationships with each other.2. Different from other

1. New XX.PCH2. Add xx.pch in Prefix Header in Build Settings3. Add the required. h file or other declaration in xx.pchFor example#import #import #import － －！ There's a pit .... pch location Problem: Right-xx.pch show File insepector, view right

For a project on hand, I need to use the HMAC function in the Commoncrypto library. Although Apple has provided many system libraries in Swift, Commoncrypto is not in it. Fortunately, it's not much of a bother to use this library, just a little

Sometimes our page is very large need to scroll only with scroll bar scrolling can be less precise, this need to use page Control, as we usually operate the iphone, each page has some apps, the number of pages is marked with small dots, each time a

Since the June WWDC Congress by Apple's great God Chris Lattner to us for the first time to show that Swift has been more than half a year, although the vast majority of software companies in the code is still not seen the slightest shadow of swift,

In the tutorial before learning a two-dimensional array, the original inside a lot of knowledge points are not very understanding, and then after some information to find, basically understand thoroughly, do a summary of it.The usual, the first code:

Original blog, reproduced please indicate the sourceBlog.csdn.net/hello_hwcDefinition of a generic typeSimilar to C + +, generics define a kind of reusable code for any type that implements code in an abstract way. Both the array and the dictionary

When you understand the meaning of @UIApplicationMain, you find something magical. Func application (application:uiapplication, didfinishlaunchingwithoptions launchoptions: [Nsobject:anyobject]?)- > Bool { //Override point for

Original blog, reproduced please indicate the sourceHttp://blog.csdn.net/hello_hwcThe steps are relatively simple:1, in Objective C project, create a new file (command+n), select the Swift file2, choose Create Bridge-header, will generate two files,

Arrays are common data types in Objective-c, as is the case in Swift, where there are Nsarray and Nsmutablearray in OC, but only let and Var are used in Swift to differentiate whether an array is mutable, Arrays in Swift are type-safe, so the type

1.swift Why don't you need mainThere is a main function in the C + + and other languages, with the program starting from main and executing the program as follows:int main (int argc, const char * argv[]) { printf ("Hello, world!\n"); return 0;}

//Playground-noun:a Place where people can playQuick understanding of Swift's common knowledge through code requires a certain object-c baseImport UIKit//declaring constantsLet Maximumnumberofattemps =Ten//declaring Variablesvar currentloginattempt =

//Playground-noun:a Place where people can playImport UIKit//Array Dictionary//The set of variables assigned to the Var set is a mutable mutable, and the set assigned to let is immutable immutable//array array equivalent to [SomeType]var

Swift is more than Objective-c, and with objective-c seamless integration, is a sharp weapon. In Swift, you can see the different programming language of the Shadow, the world language a big copy, so good, reduce the learning cost of different

The main things to see today are the basic operators in Swift. Record it.Null-value merge operator (Nil coalescing Operator)a ?? bIn the??is a null-value merge operator thataBe judged, if not fornilThe package is unpacked, otherwise it returnsb。The