uiimage 视图和矩形答案

【问题标题】：uiimage view and rectangleuiimage 视图和矩形
【发布时间】：2011-06-04 13:08:26
【问题描述】：

我想在一张图片上画一个矩形该怎么做？

【问题讨论】：

你的意思是在图像上方画一些东西吗？
是的，我想在图像上画画。我可以在该图像上放置另一个图像或视图，这对我来说不是问题，但如何绘制？

标签： iphone ipad uiimageview

【解决方案1】：

从阅读 Quartz 2D Programming Guide 开始，然后转到路径部分。

【讨论】：

【解决方案2】：

如果您只想为图像添加一个简单的彩色矩形，您可以这样做：

    UIImage *imageFile = [[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"myImageFile" ofType:@"jpg"]];
    UIImageView *myImageFileView = [[UIImageView alloc] initWithImage:imageFile];
    myImageFileView.frame = CGRectMake(0, 0, 320, 480); //size of image view
    [self.view addsubview:myImageFileView]; //I assume this is within a view controller .m
 UIView *rectangle = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)]; //A rectangle at point (0, 0) 50x50 in size.
 rectangle.backgroundColor = [UIColor redColor]; //color the rectangle
 [myImage addSubview:rectangle]; //add the rectangle to your image
 [rectangle release]; 
 [imageFile release];
 [myImageFileView release];

【讨论】：

实际上我在视图上有一张图片。现在我想在该图像上绘制一个透明矩形。

【解决方案3】：

-(IBAction)Handeltap:(UIGestureRecognizer *)sender
{


    if(sender.state==UIGestureRecognizerStateBegan)
    {
        tapPoint1 = [sender locationInView:sender.view];
        NSLog(@"UIGestureRecognizerStateBegan and x=%d and y=%d",(int)tapPoint1.x,(int)tapPoint1.y);
        img1=[[UIImageView alloc]initWithImage:nil];
        [img1 setBackgroundColor:[UIColor lightTextColor]];
        CGRect rect1=CGRectMake((float)tapPoint1.x,(float)tapPoint1.y,50,20);
        NSLog(@"rect=%f and %f and %f and %f",rect1.origin.x,rect1.origin.y,rect1.size.width,rect1.size.height);
        [img1 setFrame:rect1];
        [self.view addSubview:img1];
        [self.view bringSubviewToFront:img1];

    }
    if(sender.state==UIGestureRecognizerStateChanged)
    {tapPoint2 = [sender locationInView:sender.view];
//      NSLog(@"UIGestureRecognizerStateChanged and x=%d and y=%d",(int)tapPoint.x,(int)tapPoint.y);    
        [img1 setFrame:CGRectMake(img1.frame.origin.x,img1.frame.origin.y,(float)tapPoint2.x-img1.frame.origin.x,(float)tapPoint2.y-img1.frame.origin.y)];
}
    if(sender.state==UIGestureRecognizerStateEnded)
    {
        tapPoint2 = [sender locationInView:sender.view];
        NSLog(@"UIGestureRecognizerStateEnded and x=%d and y=%d",(int)tapPoint2.x,(int)tapPoint2.y);



        [img1 setFrame:CGRectMake(img1.frame.origin.x,img1.frame.origin.y,(float)tapPoint2.x-img1.frame.origin.x,(float)tapPoint2.y-img1.frame.origin.y)];

    }

}

添加点击手势并粘贴

UILongPressGestureRecognizer *ges11=[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(Handeltap:)];

    [self.view addGestureRecognizer:ges11];

坦克帮我..

【讨论】：