ios - Creating multiple views programmatically -

hello ask how create multiple views programmatically , show them on screen, have tried there missing.

int x,y;  x= 0; y=50;  (int i=0; i<4; i++) {     uiview *view = [[uiview alloc] initwithframe:cgrectmake(x, y, 300, 100)];  view.backgroundcolor = [uicolor redcolor];   [self.view addsubview: view];      y+=40; }  

int x,y; x= 0; y=50;  (int i=0; i<4; i++) {     uiview *view = [[uiview alloc] initwithframe:cgrectmake(x, y, 300, 100)];      view.backgroundcolor = [uicolor redcolor];     view.layer.cornerradius = 5.0f;     [self.view addsubview: view];     y+=140; //y next view should height of previous view , margin between view  }