图片中间拉伸，周围保持原状

图片中间拉伸，周围保持原状

- (UIImage *)getChangeImage {
    // 加载图片
    UIImage *image = [UIImage imageNamed:@"课程表-phone-阴影下"];
    // 设置端盖的值
    CGFloat top = image.size.height * 0.5;
    CGFloat left = image.size.width * 0.5;
    CGFloat bottom = image.size.height * 0.5;
    CGFloat right = image.size.width * 0.5;
    // 设置端盖的值
    UIEdgeInsets edgeInsets = UIEdgeInsetsMake(top, left, bottom, right);
    // 设置拉伸的模式
    UIImageResizingMode mode = UIImageResizingModeStretch;
    // 拉伸图片
    UIImage *newImage = [image resizableImageWithCapInsets:edgeInsets resizingMode:mode];
    return newImage;
}