Code

    UIImage *img = [UIImage imageNamed:@"chat_bg"];

    // 正确拉伸图片方法1
    self.right1ImgV.image = [img resizableImageWithCapInsets:UIEdgeInsetsMake(15, 15, 15, 15)];
    
    // 正确拉伸图片方法2
    self.right2ImgV.image = [img resizableImageWithCapInsets:UIEdgeInsetsMake(15, 15, 15, 15)
                                                resizingMode:UIImageResizingModeStretch];
    
    // 正确拉伸图片方法3
    self.right3ImgV.image = [img stretchableImageWithLeftCapWidth:img.size.width * 0.5
                                                     topCapHeight:img.size.height * 0.5];
    
    // 正确拉伸图片方法4  在 Assets.xcassets 中操作
    UIImage *img1 = [UIImage imageNamed:@"chat_bg_1"];
    self.right4ImgV.image = img1;

Sketch

Simulator Screen Shot.png

GitHub

• StretchImageDemo

Articles

• iOS 图片拉伸技巧
• iOS 中拉伸图片的几种方式