Implementation of the IOS dialing Function

// Define the operation when the dial button is clicked [CPP]View
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1. -(Void) callaction {
2. Nsstring * number = @ ""; // enter the phone number here
3. // Nsstring * num = [[nsstring alloc] initwithformat: @ "Tel: // % @", number]; // number is the number string. If this method is used to end the call, the contact list is displayed.
5. Nsstring * num = [[nsstring alloc] initwithformat: @ "telprompt: // % @", number]; // This method is used to check whether or not the method is valid and then return to the program online.
6. [[Uiapplication sharedapplication] Openurl: [nsurlurlwithstring: num]; // dial
7. }

 // The following Code adds a call button in the application and click it to call the phone number. It is useful for iPhone developers. // Add the phone icon button[CPP]View
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1. Uibutton * btnphone = [[uibuttonbuttonwithtype: uibuttontyperoundedrect] retain];
2. Btnphone. Frame = cgrectmake (280,10, 30,30 );
3. [Btnphone setbackgroundcolor: [uicolor redcolor];
4. // Click the dialing button to directly dial
5. [Btnphone addtarget: Self action: @ selector (callaction) forcontrolevents: uicontroleventtouchupinside];
6. [Self. Window addsubview: btnphone];

//Method 3 call[CPP]View
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1. -(Void) callphone {
2. Nsstring * phonenum = @ ""; // phone number
3. Nsurl * phoneurl = [nsurl urlwithstring: [nsstringstringwithformat: @ "Tel: % @", phonenum];
4. If (! Phonecallwebview ){
5. Phonecallwebview = [[uiwebview alloc] initwithframe: cgrectzero]; // This webview is only a background and easy to add to the page. The effect is the same as method 2, but this method is legal.
6. }
7. [Phonecallwebview loadrequest: [nsurlrequestrequestwithurl: phoneurl];
8. }