Monotouch-ios use Uiimagepickercontroller to open Picture Library and camera Select picture to modify Avatar

Application tried to present modally an active controller <UIImagePickerController:0x7b6ff400>

1,addgesturerecognizer adding an event to a picture view

Fillet avatar _avatarview = new Uiimageview (new RectangleF (_blockspace, _blockspace, 2 * _avatarradius, 2 * _avatarradius)); UIImage img = uiimage.fromfile ("profile-pic.jpg"); _avatarview.layer.contents = img. Cgimage;_avatarview.layer.maskstobounds = true;//If the maskstobounds is not set to true, the picture rounded corners are not valid _avatarview.layer.cornerradius = _avatarradius; _avatarview.userinteractionenabled = true;//User interaction attribute () _avatarview.addgesturerecognizer (New UITapGestureRecognizer ( Onclickimage));

void Onclickimage () {            try            {                //uiactionsheet is a dialog box that pops up the Select button item in iOS, you can add multiple items and add a click event for each item.                //changepictureactionsheetdelegate: Gets the current click                by overriding the clicked method of the Uiactionsheetdelegate Uiactionsheet _actionsheet = new Uiactionsheet ("Select Picture",                new Changepictureactionsheetdelegate (This,_avatarview), " Cancel ",                null," from Photo Gallery "," take photos ");                                _actionsheet.showinview (this. View);            }            catch (Exception e)            {                Console.WriteLine ("Error:" + e.message);}            }

Uiactionsheet is a dialog box for selecting button items that pops up in iOS, you can add multiple items and add click events for each item.

2, get Uiactionsheet selection

  key class: Uiactionsheetdelegate. By overriding the clicked method of the Uiactionsheetdelegate, get the Uiactionsheet current click item  

Class Changepictureactionsheetdelegate:uiactionsheetdelegate {Uiviewcontroller _controller;        Uiimageview _img;        Uiimagepickercontroller Picker; Public changepictureactionsheetdelegate (Uiviewcontroller controller,uiimageview img) {_controller = con            Troller;        _img = img; } public override void Clicked (Uiactionsheet actionsheet, int buttonindex) {Console.WriteLine ("You            Selected: "+ Buttonindex);                Switch (buttonindex) {case 1:callphoto (Uiimagepickercontrollersourcetype.camera); Case 0:callphoto (uiimagepickercontrollersourcetype.photolibrary);                Break            Default:break; }} private void Callphoto (Uiimagepickercontrollersourcetype type) {Conso Le.            WriteLine ("Begin ...");             if (uiimagepickercontroller.issourcetypeavailable (type)) {try   {picker = new Uiimagepickercontroller (); Picker.                    SourceType = type; Allows editing of picture picker.                    Allowsediting = true; if (_controller. Presentedviewcontroller = = null) {_controller.                    Presentmodalviewcontroller (picker, false); }//picker. Finishedpickingimage + = Picker_finishedpickingimage; (invalid)//avatarpickerdelegate: by overriding Uiimagepickercontro Llerdelegate's Finishedpickingimage method gets the selected picture picker.                    Delegate =new avatarpickerdelegate (_img);                Console.WriteLine ("Finished");                } catch (Exception e) {Console.WriteLine ("Error:" + e.message);            }} else {Console.WriteLine ("The device does not support this operation"); }        }    }

3. Get the selected picture

Key class: Uiimagepickercontrollerdelegate. Get the selected picture by overriding the Uiimagepickercontrollerdelegate Finishedpickingimage method

Class Avatarpickerdelegate:uiimagepickercontrollerdelegate {        Uiimageview _avatar;        Public avatarpickerdelegate (Uiimageview _imgview) {            _avatar = _imgview;        }                public override void Finishedpickingimage (Uiimagepickercontroller picker, UIImage image, Nsdictionary editinginfo)        {            Console.WriteLine ("Image selected");            if (image = = null)            {                Console.WriteLine ("null");            }           Update the display picture            _avatar. Layer.contents = image. Cgimage;            Close the Uiimagepicker            picker. Dismissmodalviewcontrolleranimated (true);            Console.WriteLine ("Finish Selection");                    }    }

　　

Monotouch-ios use Uiimagepickercontroller to open Picture Library and camera Select picture to modify Avatar