如何保存和加载绘图线iphone SDK

Question

我想永久保存绘图线并加载从项目资源保存的绘图线......！

现在我在触摸移动事件上获得x和y位置。我想在项目的本地资源中保存x和y位置，但我不知道在ios中不知道......！

从项目本地资源保存文件中加载已保存的x和y位置..！

我想在下面保存绘图线：

请任何人帮助我，非常感谢......！

谢谢...！

Answer 1

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

    if(!mouseSwiped) {
        CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeClear);
        UIGraphicsBeginImageContext(ivBack.frame.size);
        [drawImage.image drawInRect:CGRectMake(0,0, self.ivBack.frame.size.width,self.ivBack.frame.size.height)];
        CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
        CGContextSetLineWidth(UIGraphicsGetCurrentContext(), line);
        CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [pickColor CGColor]);
        CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
        CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
        CGContextStrokePath(UIGraphicsGetCurrentContext());
        CGContextFlush(UIGraphicsGetCurrentContext());

 NSData *dataImage=UIImagePNGRepresentation(UIGraphicsGetImageFromCurrentImageContext());
        [dataImage writeToFile:[self SavedImage:(@"1.png")] atomically:YES];
        drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    }
}

肯定能解决你的问题

Answer 2

如果要存储x和y位置，可以存储数组，然后使用writeToFile将其保存到磁盘。这将以plist格式将数据写入磁盘。

NSMutableArray *points = ...
[points writeToFile:someFileInTheBundle atomically:YES];

您还可以将图形存储为图像并将其写入磁盘。我写的这个类别应该通过为您的绘图代码提供图像来帮助您：https://github.com/kgn/BBlock/blob/master/UIImage%2BBBlock.m