IOS

1. Define a static global variable static settings * sharedsettings = nil; 2. Create a class method to return the class instance + (settings *) sharedinstance {@ synchronized (Self) {If (sharedsettings = nil) {sharedsettings = [[self alloc] init]; //

Reproduced from: http://blog.csdn.net/sirchenhua/article/details/7286312? Reload The key to implementing resumable data transfer through nsurlconnection is to customize the range field attribute of the HTTP request header. Range HeaderThe

  Uiscrollview principle post: http://www.cocoachina.com/bbs/read.php? Tid = 40965 // Author: strong iPhone development license ****: 79190809 mailbox: zhuolaiqiang@gmail.com post please keep in the rolling process, in fact, is modifying the origin

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Http://www.cnblogs.com/love-lie/archive/2012/07/11/2585804.htmlThe array created using an array object is very powerful. The array defined in Java or C must be of the same type as each element in the array. The objective-C language can put any type

Reproduced http://blog.163.com/wangy_0223/blog/static/45014661201222694654895/ You need to add quartzcore in frameworks. framework adds the header file # import /* many animation effects */catransition * transition = [catransition animation];

1. Use uiscrollview settings to move the whole up Place the controls on the scrollview, and then set cgpointmake (scroll. contentoffset. X, Y + 100) of scrollview when the user clicks to achieve the effect-(void)

When we develop IOS applications, especially e-commerce applications, we often encounter bar code scanning business needs. Fortunately, we already have open-source sdks for us-bar code sdks for iOS, the following describes how to use this

Original post address: http://hi.baidu.com/jwq359699768/blog/item/5df305c893413d0a7e3e6f7b.html The core text package does not exist by default. You must manually add it.In iOS, the key points of Text Formatting using core text are as

Required Conditions for iOS airprint:DeviceA. Mobile DevicesIPad (all models)IPhone (3gs or later)IPod Touch (version 3rd or later)B. printing devicesA printer that supports airprint, And the printer should have the same WiFi network as IOS Mobile

1. Create01. uitextfield * mytextfield = [[uitextfield alloc] initwithframe: cgrectmake (50,100,200, 50)]; 2. Set Delegation01. mytextfield. Delegate = self; // The delegate class must comply with the uitextfielddelegate protocol. 3. Setting the

1. Apple developer guide, very authoritative and essential Http://www.apple.com.cn/developer/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/Introduction/Introduction.html#//apple_ref/doc/uid/TP40007072-CH1-SW1 2.

Common attributes and methods of uilabel: // Create a uilabel object Uilabel * label = [[uilabel alloc] initwithframe: Self. View. bounds]; // Set the display text Label. Text = @ "This Is A uilabel demo ,"; // Set the text font Label. font =

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1. File Creation   -(Ibaction) createfile{// For error messagesNserror * error;// Create a file managerNsfilemanager * filemgr = [nsfilemanager defaultmanager];// Point to the file directoryNsstring * documentsdirectory = [nshomedirectory ()

/* Verify the mobile phone number modified by helensong */bool validatemobile (nsstring * Mobile) {// the mobile phone number starts with 13, 15, and 18, eight \ D numeric characters nsstring * phoneregex = @ "^ (13 [0-9]) | (15 [^ 4, \ D]) | (18 [0,

// Create uilabel * label1 = [[uilabel alloc] initwithframe: cgrectmake (20, 40,280, 80)]; // set the background color label1.backgroundcolor = [uicolor graycolor]; // set tag label1.tag = 91; // set tag text label1.text = @ "Hello world! "; // Set

1. Get the path of the database file self. path = nshomedirectory (); self. path = [path stringbyappendingpathcomponent: @ "Documents/data. DB "]; 2. Get the database object and open the database. If the database does not exist, the fmdatabase * DB =