Swift

You can use the optional option when the value may have a default condition. This means: There is a value that can be equal to the specific value of an X, or it may not have a value.Note: There is no such concept as an optional value in C or

The function of the Swtableviewcell is to add the Tableviewcell slide button (including the left and right slide buttons) Project address: Https://github.com/CEWendel/SWTableViewCell It was written in OC, Can be installed with pod or directly into

One, the tuple type is N any type of data composition (n>=0), the data that make up the tuple type can be called "element"Two, the definition of the tuplesuch as: let position = (X:10.5,Y:20)//Two elements of a tupleLet person = (name:

1. File suffix nameThe file suffix of OC is named: header file. h principal file. mThe swift file suffix is named:. Swift2. Code SeparatorsUse semicolons in OC; as code separatorsThere is no need to use code separators in swift, separated by lines

Object Type Instance Store property static Storage Property Instance calculation property static Computed propertySupport support is not supported for class support      Structure                        Support                           Support     

Object-oriented is a modern popular program design method, is the mainstream program design codeBasic object-oriented features include: encapsulation, inheritance, and polymorphism:Encapsulation: As much as possible to hide the internal details of

ImageView is a component we often use, but we find that there is no design for picture borders in the property editor of storyboard. Add a normal picture to the view, the effect is this:Can see, the white background of the dark picture, the effect

[Uiimageview Setimagewithurl:]: Unrecognized selector sent to instance solutionThe first time configuration, because Baidu took the tutorial, so one-time successResults The second time did not go to Baidu, the result is tragic, and then find the

1, characterIn the C # object language, characters are placed between single quotation marks ('), but in the swift language, characters must be placed between double quotation marks;(1) Unicode encodingUnicode encodings can have single-byte

Today in the use of Swift found that the write Func always required to write out the second parameter of the external variable name, do not understand, feel and the book said the function is not the same, checked, and finally found the reason:

1. New Small QQ Project2. Add the required picture resources (Resource) folder to the project. and create a new login page: Loginviewcontroller.swift3. Modify the Loginviewcontroller.swift code toImport Uikitclass

Use enum -to-create an enumeration. Like classes and all other named types, enumerations can has methods associated with them.The enum in swift changes a lot, and the enumeration looks similar to the class because it can have its own method, and the

With the slider corresponding to the stepper micro-control, sometimes we need to precisely change, then we can not use the slider to do, stepper each time with a fixed value to increase or decrease, its setting is more similar to the slider

Sometimes we need a frame to confirm or return when we do the operation, which is alertview. In the previous project, when we clicked the Stop button, the pop-up window was confirmed. Pop-up window This action occurs when we click the Stop button,

In the case of a certain swift foundation, let us do some small programs to practice practiced hand, today to try to do a simple weather forecast. Create a new project, named Weather, and then go online to find a weather forecast API, Baidu search

Ccaction Class Reference Inherits from NSObject Conforms to Nscopying Declared in CCAction.h OverviewCcaction is a abstract base class for all actions. Actions animate nodes by

A third-party class library written in objective-c language can be called in Swift.Before calling, need a bridge file, this file in the first import OC Library when the project will be prompted to create, this time as long as the answer is "yes" can

As we all know, the system automatically generates a swift.h file when Swift and objective-c are mixed. Not the bridge file, which was used to import the Objective-c class into Swift, said to be used to guide Swift in Objective-c. At that time on my

The string and int in Swfit are defined by the struct, and unlike NSString and NSNumber, if you want to include both string and int in an array, then the array is declared as [any] instead of [Anyobject], Because they're not class!.In addition,

Xcode6 creating a new project with Swift to create codeCreate a Viewcontroller inheritance UitableviewcontrollerInvolves the model, the controllerModel: Zlplace.swiftClass Zlplace:nsobject { var place = "" var visited =