Swift

It feels like a basic grammar and JS.But the biggest difference is that Swift is a strong type of language, and I personally agree with the strong type, because if the type is prone to hidden bugs that are hard to spot, it is very much in favor of

Use CoreData to save local data in swift and select the ' Use Core data ' option when creating a projectAfter the project is established, click on the file with the suffix. Xcdatamodeld, click the "Add Entity" in the lower right corner to add an

@IBAction func Buttonclick_labelctrl (sender: anyobject) { Define CGRect to initialize Uilablevar frame: cgrect = cgrect(x: , y: , Width: $ , Height: ) var label: UILabel = UILabel(frame:frame) Get and set Font size adaptive

0000_0000_0000_0101 Pnchart-swift appeared crash solution Optional Swift Blog officially opened, team members: Pmst, Starry Night Twilight, Jim, ICE. Address: optionalswift.cn. The foreign visit is slow, you understand. These days have

function function definition, parameter, return valuefunc sayHello(personName: String) -> String { let"Hello, ""!" return greeting}Parameters and return values can be omittedsayGoodbye(personName: String) { println("Goodbye, \(personName)!")

The optional value (Optional value) has two states 1. It has a value of 2. It has no valueOptional type is a new concept in SwiftThe above serverresponsecode is an int? type, the above code represents two different states of ServerresponsecodeIt is

Declaration of an arrayWith Initailizer initialization, note here that [Double] is simply the abbreviation of array:Two ways to add elements to an arrayadding elementsremove elementWhen the element is removed, the following elements automatically

The code in the global scope in 1,swift is automatically used as the entry point for the program, so the main function is not required. Also do not need to be in eachWrite a semicolon at the end of the statement.2, simple valueUse let to declare

12. The difference between conditional statements, where only the difference is written here, does not point out the difference in other respects OC is basically consistent with Swift12.1For if switch statement body in OC If there is only one line

Playground-noun:a place where people can playImport Cocoavar str = "Hello, playground"var dic:dictionary=[1: "Name", 2: "Age"]for (Id,name) in dic{println ("Id:\ (ID) name:\ (name)")}Generic typeFunc isequals (a:t,b:t)->bool{if (a = = b) {return

Variables and constants for Swift's development baseToday I learned a bit about Swift language feeling iOS has taken its own step code to simplify a lot, and can use playground a real-time preview of the effectNote: Constants can be used directly

First, the concept of computational propertiesThe computed property itself does not store the data, but instead computes the data from other storage properties, and the class, struct, and enumeration can define computed properties, unlike stored

There are many features of the Swift language, one of which is the type method, compared to other popular programming languages (C #, Java), the most important feature of the type method in Swift is its inheritance, let's give an example:As the

We have been using swift as the new programming language for Apple for some time. One of the great advantages is what Apple calls "optional types". Almost all objective-c programmers know that using nil to represent an object of a reference type has

A reference type is the passing of its own data when assigning or passing a parameter pair to a function, so that during the invocation of the function, the original data is affected and the class belongs to the reference type1. Integral type:Int8:

In swift, expressions have many forms1. Do not specify a data typevar a1=10var a2=20var a=a1>a2? " A1 ":" A2 "In the above expression, the variable or constant is assigned directly, and no data type is specified because Swift can automatically

Here's an explanation from Apple that when setting a new value for a property, you can do some processing before and after setting it, and these two keywords are like monitoring the property changes.If you don ' t need to compute the property but

This tutorial is a summary of the author's self-taught ios/swift knowledge, which applies to the application of objictive C programming and the need to understand the iOS program-based iphone and ipad programmer. Be a bigger ' siege lion ', work

Numeric type conversionsFloating-point type: If no explicitly specified type is float,swift, it is inferred as DoubleInteger ConversionsLet twothousand:uint16 = 2_000Let One:uint8 = 1Let twothousandandone:uint16 = Twothousand + UInt16

today or repeat yesterday do things--knock code, but the only difference is that the knowledge is different, we further to the deep level of learning, feeling more and more interesting, although near the end of watching everyone's enthusiasm is