IOS将UIView转化为UIImage

Posted 2020-09-25 mfmdaoyou

+(UIImage*)createImageFromView:(UIView*)view

{

//obtain scale

    CGFloat scale = [UIScreen mainScreen].scale;

開始画图，以下方法。第一个參数表示区域大小。第二个參数表示是否是非透明的。假设须要显示半透明效果。须要传NO，否则传YES。第三个參数就是屏幕密度了

    UIGraphicsBeginImageContextWithOptions(CGSizeMake(view.frame.size.width,
                                                      view.frame.size.height),
                                           NO,
                                           scale);
   将view上的子view加进来
    [view.layer renderInContext:context];
    CGContextRestoreGState(context);
    //開始生成图片
    UIImage* image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}