4. Hat, stretching the image API (see effect chart)

UIImage *img=[uiimage imagenamed:@ "Bubbleself.png"];    Img=[img stretchableimagewithleftcapwidth:15 Topcapheight:12];    Uiimageview *imgview=[[uiimageview alloc]initwithimage:img];    [Imgview Setframe:cgrectmake (10, 10, 200, 200)]; [Self. View Addsubview:imgview];

(Nsinteger) Topcapheight This function is an instance function of UIImage, its function is to create a content can be stretched, and the corner does not stretch the picture, need two parameters, the first is the left not stretch the width of the area, the second parameter is not stretched above the height.

The meaning of the parameter is if the parameter specifies 10, 5. So, the picture on the left 10 pixels, the top 5 pixels. Will not be stretched, the X coordinate is 11 and one pixel will be copied horizontally, and a pixel with a Y coordinate of 6 will be copied vertically.

Note: Only one pixel is copied to a certain width. The remaining pixels behind the image are not stretched.

4. Hat, stretching the image API (see)