iOS development calls phone cameras and albums

How to click the button
-(void) Catchimage {Uialertcontroller *alert = [Uialertcontroller alertcontrollerwithtitle:@ "Select message:@ to select Photos" pref        Erredstyle:uialertcontrollerstylealert]; Uialertaction *action1 = [uialertaction actionwithtitle:@ "Camera" Style:uialertactionstyledefault handler:^ ( Uialertaction * _nonnull action) {if ([Uiimagepickercontroller issourcetypeavailable:uiimagepickercontroll            Ersourcetypecamera]) {Uiimagepickercontroller *picker = [[Uiimagepickercontroller alloc] init];            Picker.sourcetype = Uiimagepickercontrollersourcetypecamera;            Picker.delegate = self;            picker.allowsediting = YES;                    [Self presentviewcontroller:self animated:yes completion:nil]; } else {Uialertcontroller *controller = [Uialertcontroller alertcontrollerwithtitle:@ "No webcam" Messa            Ge:nil Preferredstyle:uialertcontrollerstyleactionsheet]; Uialertaction *action = [Uialertaction actionwithtitle: @ "OK" style:uialertactionstyledestructive Handler:nil];            [Controller addaction:action];        [Self Presentviewcontroller:controller animated:yes completion:nil];    }    }];    [Alert Addaction:action1]; Uialertaction *action2 = [uialertaction actionwithtitle:@ "album" Style:uialertactionstyledefault handler:^ ( Uialertaction * _nonnull action) {Uiimagepickercontroller *picker = [[Uiimagepickercontroller alloc] init]        ;        Picker.sourcetype = uiimagepickercontrollersourcetypephotolibrary;        Picker.delegate = self;        picker.allowsediting = YES;    [Self Presentviewcontroller:picker animated:yes completion:nil];    }];    [Alert Addaction:action2]; [Self Presentviewcontroller:alert animated:yes completion:nil];} method to execute after selecting the picture-(void) Imagepickercontroller: (Uiimagepickercontroller *) Picker Didfinishpickingmediawithinfo: ( Nsdictionary<nsstring *,id> *) Info {UIImage *image = [info objectforkey:uiimagepickercontrolleroriginalimage];    Self.imageView.image = image; [Picker Dismissviewcontrolleranimated:yes completion:nil];}        -(void) viewdidload {[Super viewdidload];    _button = [UIButton buttonwithtype:uibuttontyperoundedrect];    [_button settitle:@ "select Avatar" Forstate:uicontrolstatenormal];    _button.frame = CGRectMake (100, 100, 100, 30);    [_button addtarget:self Action: @selector (Catchimage) forcontrolevents:uicontroleventtouchupinside];        [Self.view Addsubview:_button];    _imageview = [[Uiimageview alloc] Initwithframe:cgrectmake (100, 250, 150, 150)];    _imageview.backgroundcolor = [Uicolor Yellowcolor];                [Self.view Addsubview:_imageview]; Do any additional setup after loading the view.}

　　

iOS development calls phone cameras and albums