在iPhone中裁剪图像

Question

我喜欢在UIImageView中裁剪图像。你能否给我提供对我有用的完整源代码。

Answer 1

我用来裁剪在相同的UIImageView

图像

1）存储图像uiimageview

2）采取相同的UIImageView并将其存储为UIImage的

3）裁剪图像，并恢复它

下面的代码将有助于

- （IBAction为）setCropItem：（ID）发送者 {

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 2

它可以帮助你

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]; 

和下面的链接更加有用

how to crop image in to pieces programmatically

好运

Answer 3

若y你需要一个UI控件来裁剪图像尝试SSPhotoCropperViewController。这是一个自定义视图控制器，它提供了一个简单，可配置且易于使用的用户界面，用于在iPhone应用程序中裁剪和缩放照片。

这里是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u能在ImageView的裁剪和裁剪图像将在ImageViewNew在显示