Swift

1. StabilityWhen the Swift2.0 came out, 1.0 of the code was basically changed over.2. NecessityAt present, there are about 100w on the App Store is OC written, if it is a simple hobby, you can learn swift, if engaged in professional development,

func stringmid (wholestring:string, front:string, behind:string),string {if wholestring. IsEmpty {return("") //wholestring cannot be nil }Else { var whole:nsstring=wholestring let frontindex = whole. Rangeofstring(front) if frontindex.

This method in the Baidu map demo bus Search a class of files;The parameter is a polyline that is connected to all the callout points, which can change the extent of the map display, and show the optimal display scale (pro-test in your own project)

The content of this article is referenced from portal. the original was written in OC, and I changed it to Swift. Let's start by looking at:The first picture is that we drew an image of "IOS", the second picture is that we clicked save successfully,

/* Note: 1,return aneed && acanusesum, only the front is true to calculate the back, as in other languages ~ 2, when the return value of the function as an argument, is definitely called, such as Form 1, 3, when the body of the function as the

A. closure expression syntax (Closure expressionsSyntax)The closure expression syntax has the following general form:{(parameters)-ReturnType inStatements}The closure expression syntax can use constants, variables, and inout types as arguments, and

Swift provides a number of convenient functions for manipulating arrays, such as filter,map,reduce,flatmap . Today we'll look at filter , as the name implies , is used for filtering, which is A new weapon provided by Swift for each array,filter

Import FoundationSingle-line CommentMultiline comments (support nesting, OC is not supported)Constant let, which cannot be changed after initialization.The specific type of the constant can be automatically identified, what type is followed by the

The SWIFT team announced in its blog that the first developer preview of Swift's 3.0 language will be released on May 12, and the official version will be available in 4-6 weeks. The developer Preview phase has no definite update cycles and plans,

/* variable and constant definition: variable: var constant: Let format: Modifier (var|let) variable | constant name: Data type = value */var Numbera:int = 10//define variable and initialize Numbera = 20//Variable value can be modified to allow

------------------------///* Note: 1: Static function can not inherit 2: The protocol is not the same as OC, although there are optional and required keywords, but not good to make a ~ The static function (+) inside the 3:OC protocol can override

Swift development uses closure pass valueDevelopment, from one page to another page, sometimes need to jump to the page to return the value back to the previous page, here to introduce the swift development using the closure valueFirst we create two

: Playground-noun:a place where people can playimport uikit/*swift The nil representation is another type, and unlike OC, any object can be assigned a value of nil in Nil,swift is null , what does not mean, when a variable may exist null value, must

Outputs float a = 1.234567 with a decimal number of 2in OC, you can use nslog Format OutputNSLog(@ "float:%.2f", a); Output:double:1.23In Swift, the formatted initial method of string helps us to take advantage of the formatted string:Let format =

Passing references to parametersA class is a reference type, and other data types such as Integer, float, Boolean, character, string, tuple, collection, enumeration, and struct are all value types.Sometimes it is possible to pass a value type

An arrayis a series of ordered sets of elements of the same type. The collection elements in the array are ordered and can recur. You can use one of the following statements when declaring an array type. var studentlist1:arrayvar studentList2:

The corresponding mutable string can be inserted, deleted, and replaced, andstring provides several ways to help implement these operations. These methods are as follows:Splice (_:atindex:). Inserts a string at the index position.Insert (_:atindex:).

1.Swift1> Swift Initial impact Swift is the next-generation App development programming language for IOS, OS X, and WatchOS and TvOS. The Chinese name "Swift" implies agility, dexterity and simplicity. Swift is similar to syntax for

Because of the time, I do not intend to chat again, directly into the matter.In OC, the anonymous function is block, also known as the code block, then in Swift, the anonymous function we call " closure ". function is actually a special kind of

1, TextView placed in a nsscrollview, as documentview exist.@IBOutlet weak var txtscrollview:nsscrollview!2. Writing a string in TextViewSelf.txtScrollView.documentView?. SetString ("write the first sentence. ")3. Adding a string in