Question

我喜欢在UIImageView中裁剪图像。你能否提供对我有用的完整源代码。

Answer 1

它可以帮到你

 UIImage* whole = [UIImage imageNamed:@"whole.jpg"]; //I know this image is 300x300


 CGImageRef cgImg = CGImageCreateWithImageInRect(whole.CGImage, CGRectMake(x, y, 100, 100));
  UIImage* part = [UIImage imageWithCGImage:cgImg];
  UIImageView* Croppedimage = [[UIImageView alloc] initWithImage:part];

以下是更有用的链接

how to crop image in to pieces programmatically

祝你好运

Answer 2

我曾经在同一个UIImageview中裁剪图像

1）存储图像uiimageview

2）使用相同的uiimageview并将其存储为Uiimage

3）裁剪图像并将其恢复

以下代码将有所帮助

- （IBAction为）setCropItem：（ID）发送方 {

UIGraphicsBeginImageContext(self.view.bounds.size); [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *finishedPicForCrop = UIGraphicsGetImageFromCurrentImageContext();
CGImageRef imageRef = CGImageCreateWithImageInRect([finishedPicForCrop CGImage], CGRectMake(0, 45, 320, 420));
UIImage *img = [UIImage imageWithCGImage:imageRef]; 
CGImageRelease(imageRef);
[firstImageView removeFromSuperview];
secondImageView = [[UIImageView alloc] initWithImage:img];
[secondImageView setFrame:CGRectMake(0, 0, 320, 460)];
scrollView.contentSize = secondImageView.bounds.size;
[scrollView addSubview:secondImageView];

}

Answer 3

如果您需要UI控件来裁剪图片，请尝试SSPhotoCropperViewController。它是一个自定义视图控制器，提供简单，可配置且易于使用的UI，用于在iPhone应用程序中裁剪和缩放照片。

以下是tutorial和source code on GitHub。

Answer 4

-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event{
// get touch event
UITouch *touch = [[event allTouches] anyObject];
StartPoint = [touch locationInView:touch.view];
if (Img_Screen!=nil) {
    [Img_Screen removeFromSuperview];
    Img_Screen=nil;

}

}

 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
// get touch event
UITouch *touch = [[event allTouches] anyObject];
EndPoint = [touch locationInView:touch.view];
[self finishedTouchInside];

}

 -(void)finishedTouchInside{

CGFloat width=EndPoint.x-StartPoint.x;
CGFloat hieght=EndPoint.y-StartPoint.y;
CGRect myImageRect = CGRectMake(StartPoint.x, StartPoint.y, width, hieght);
Img_Screen= [[UIImageView alloc] initWithFrame:myImageRect];

CGImageRef imageRef = CGImageCreateWithImageInRect([imgView.image CGImage], myImageRect);
// or use the UIImage wherever you like
[Img_Screen setImage:[UIImage imageWithCGImage:imageRef]];
CGImageRelease(imageRef);
[self.view addSubview:Img_Screen];
imageViewNew.image=[UIImage imageWithCGImage:imageRef];

}

这里你可以在imageView中裁剪，裁剪的图像将显示在ImageViewNew

中

在iPhone中裁剪图像

4 个答案: