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("onclickwithextsender:forevent:") } for the purposes of data encapsulation, we will add the above method to Private to make it a private method, as shown in the code below. Private func OnClick (sender:anyobject) {NSLog ("OnClick:")}However, the following error occurs when the method is called:Unrecognized selector Sentto instance 0X7F7F81499B10 'This error means that the method specified by the selector is not found, that is, no OnClick: method. It is a good practice to add @objc attribute co

framework type. These data types areFoundationthere are corresponding data types in the framework, and these data types also have someSwiftThe native data type has a corresponding relationship. Watermark/2/text/ahr0cdovl2jsb2cuy3nkbi5uzxqv/font/5a6l5l2t/fontsize/400/fill/i0jbqkfcma==/dissolve/70/gravity /center "/>SeeSwiftnative type and Core FoundationExamples of conversions between types:Import Corefoundationimport Foundation var cfstr1:cfstring = "Hello,world" //Create cfstring string va

expected initial state, and finally returns the value of the temporary variable as the default value for the property.Class SomeClass {Let list: [string:double] = { var scorelist = ["ASK": 103.5, "Alice": 115.8, "Alisa" : 118.5] return scorelist } () //Note closing the curly brace at the end of the closure is followed by a pair of empty parentheses. This is used to tell Swift to e

scenes "of the stringUnicodeRepresentation (Unicode representations of Strings)When a Unicode string is written into a text file or other storage, the Unicode scalar in the string is encoded in several encoding formats defined by Unicode. The small block encoding in each string is called a code unit. The encoding format includes the UTF-8 encoding format (a code unit with an encoded string of 8 bits), a UTF-16 encoding format (a code unit with an encoded string of 16 bits), and a UTF-32 encodin

=" Wkiol1bfvvhtcfq9aaev0cml2rc039.jpg "/>2 . Space aspectsThe touch point object also includes the current position information in the View or window, as well as the previous location information, if any. The following method is where you can get the position of the touch point in the window or view. Func Locationinview (_ View:uiview?), CgpointGet location information in the window or view where the previous touch point is located:Func Previouslocationinview (_view:uiview?), CgpointWelcome to

slider.maximumvalue=1//Maximum Value slider.value=0.5 //Current default value slider.continuous=falsenbsp///slide stops before triggering valuechanged events //Add response Event slider.addtarget (self,action: " Sliderdidchanged: ", forcontrolevents:uicontrolevents.valuechanged) //set the color of the side slots slider.minimumtracktintcolor=uicolor.redcolor () //left slot color, default is blue slider.maximumtracktintcolor=uicolor.browncolor () //right slot color, default is gray self.vi

Create a single view appIn the View window stall a navigation controller, the default navigation controller is automatically associated with the table view, if not required, you can delete the automatically added table view, create a new view Controller can be associated with navigation controller. (Right-drag from Nav to view, select Rootview)650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/6D/A5/wKiom1VoIRrTVOsaAABIDe5-hKE437.jpg "style=" float: none; "title=" Nav.png "alt=" Wkiom1vo

' final ' class methodUse Final can control our classes are limited inheritance, especially in the development of some commercial software, when appropriate to add Final restrictions are necessary. Welcome to follow Dongsheng Sina Weibo@tony_Dongsheng. Learn about the latest technical articles, books, tutorials and information on the public platform of the smart Jie classroom650) this.width=650; "title=" 00.png "src=" http://s4.51cto.com/wyfs02/M00/7