截取图片

来源：互联网发布：db2 命令行执行sql 编辑：程序博客网时间：2024/05/20 22:04
//截取self.view全图    //    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, self.view.opaque,0.0);    //    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];    //    UIImage * img = UIGraphicsGetImageFromCurrentImageContext();    //    UIGraphicsEndImageContext();            UIImage* image = nil;        //    UIGraphicsBeginImageContext(_myScrollView.contentSize);//这个方法不清晰        //函数原型为：    //void UIGraphicsBeginImageContextWithOptions(CGSize size, BOOL opaque, CGFloat scale);    //size——同UIGraphicsBeginImageContext    //opaque—透明开关，如果图形完全不用透明，设置为YES以优化位图的存储。    //scale—–缩放因子    UIGraphicsBeginImageContextWithOptions(_myScrollView.contentSize, NO,0.0);//开始截图    {        CGPoint savedContentOffset = _myScrollView.contentOffset;        CGRect savedFrame = _myScrollView.frame;                _myScrollView.contentOffset = CGPointZero;        _myScrollView.frame = CGRectMake(0, 0, _myScrollView.contentSize.width, _myScrollView.contentSize.height -40.5);                [_myScrollView.layer renderInContext:UIGraphicsGetCurrentContext()];        image = UIGraphicsGetImageFromCurrentImageContext();                _myScrollView.contentOffset = savedContentOffset;        _myScrollView.frame = savedFrame;    }        UIGraphicsEndImageContext(); //结束截图
最后的image就是图片
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