IOS pictures of chat bubbles show objective-c and Swift, how to implement a chat software picture showing the cropped bubbles after it!!!

How to realize the clipping of the image of the chat software?

Objective-c:

<pre name= "code" class= "OBJC" >-(void) viewdidload {
    [super viewdidload];
    
    Uiimageview *imageview01 = [[Uiimageview alloc] init];
    [ImageView01 Setframe:cgrectmake (190, 180)];
    [ImageView01 setimage:[uiimage imagenamed:@ "style.jpg"]];
    [Self.view addsubview:imageview01];
    
    UIImage *bubble = [uiimage imagenamed:@ "ICON_CHAT_RIGHT_BG"];
    Uiimageview *imageview = [[Uiimageview alloc] init];
    [ImageView SetFrame:ImageView01.frame];
    [ImageView setimage:[bubble stretchableimagewithleftcapwidth:15 topcapheight:15]];
    
    Calayer *layer              = imageview.layer;
    Layer.frame                 = (cgrect) {{0,0},imageview.layer.frame.size};
    ImageView01.layer.mask = layer;
    [ImageView01 Setneedsdisplay];
}

Swift:

Override Func Viewdidload () {
        super.viewdidload ()
        //Do no additional setup after loading the view, typically fro M a nib.
        var imageview01 = Uiimageview (Frame:cgrectmake (190, 180))
        Imageview01.image = UIImage (named: "Style.jpg") C4/>self.view.addsubview (imageview01)
        
        var imageview02 = Uiimageview (frame:imageview01.frame)
        Imageview02.image = UIImage (named: "Icon_chat_right_bg")? Stretchableimagewithleftcapwidth (topcapheight:15)
        
        var layer = Imageview02.layer
        layer.frame = CGRect ( origin:cgpointzero,size:imageview02.layer.frame.size)
        imageview01.layer.mask = Layer
        
    }

Style.jpg:

:

ICON_CHAT_RIGHT_BG: