iOS

Question

'daki bir resmi nasıl kırpırsınız Bir bölümde çıkartma yapabileceğiniz bir fotoğraf uygulamasına sahibim. İşiniz bittiğinde, görüntüyü kaydetmek istiyorum. İşte bunu yapmam gereken kod.

if(UIGraphicsBeginImageContextWithOptions != NULL) 
{ 
    UIGraphicsBeginImageContextWithOptions(self.view.frame.size, YES, 2.5); 
} else { 
    UIGraphicsBeginImageContext(self.view.frame.size); 
} 
CGContextRef contextNew=UIGraphicsGetCurrentContext(); 

[self.view.layer renderInContext:contextNew]; 

UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); 

UIGraphicsEndImageContext(); 

Şimdi kaydedilmesini görüntü gayet görüntünün, tam ekran, ama şimdi resmi kırpmak gerekiyor ve nasıl bilmiyorum. Aşağıdaki bağlantıdan görüntüyü görebilirsiniz: http://dl.dropbox.com/u/19130454/Photo%202012-04-09%201%2036%2018%20PM.png

Ben kırpmak gerekiyor: soldan 91px ve sağ 220px Herhangi bir yardım büyük takdir alt

dan. Eğer işleri açık bir şekilde açıklamadıysam, lütfen bana bildirin ve tekrar açıklamak için elimden gelenin en iyisini yapacağım.

Answer 1

Bu nasıl

CGRect clippedRect = CGRectMake(self.view.frame.origin.x+91, self.view.frame.origin.y, self.view.frame.size.width-91*2, self.view.frame.size.height-220); 
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], clippedRect); 
UIImage *newImage = [UIImage imageWithCGImage:imageRef]; 
CGImageRelease(imageRef); 

Answer 2

- (UIImage*)imageByCropping:(CGRect)rect 
{ 
    //create a context to do our clipping in 
    UIGraphicsBeginImageContext(rect.size); 
    CGContextRef currentContext = UIGraphicsGetCurrentContext(); 

    //create a rect with the size we want to crop the image to 
    //the X and Y here are zero so we start at the beginning of our 
    //newly created context 
    CGRect clippedRect = CGRectMake(0, 0, rect.size.width, rect.size.height); 
    CGContextClipToRect(currentContext, clippedRect); 

    //create a rect equivalent to the full size of the image 
    //offset the rect by the X and Y we want to start the crop 
    //from in order to cut off anything before them 
    CGRect drawRect = CGRectMake(rect.origin.x * -1, 
           rect.origin.y * -1, 
           self.size.width, 
           self.size.height); 

    //draw the image to our clipped context using our offset rect 
    // CGContextDrawImage(currentContext, drawRect, self.CGImage); 
    [self drawInRect:drawRect]; // This will fix getting inverted image from context. 

    //pull the image from our cropped context 
    UIImage *cropped = UIGraphicsGetImageFromCurrentImageContext(); 

    //pop the context to get back to the default 
    UIGraphicsEndImageContext(); 

    //Note: this is autoreleased 
    return cropped; 
} 

Answer 3

böyle bir şey size yardımcı olabilecek kod takiben Resmi kırpmak

https://github.com/myang-git/iOS-Image-Crop-View

** How to Use ** 

Very easy! It is created to be a drop-in component, so no static library, no extra dependencies. Just copy ImageCropView.h and ImageCropView.m to your project, and implement ImageCropViewControllerDelegate protocol. 
Use it like UIImagePicker: 
- (void)cropImage:(UIImage *)image{ 
    ImageCropViewController *controller = [[ImageCropViewController alloc] initWithImage:image]; 
    controller.delegate = self; 
    [[self navigationController] pushViewController:controller animated:YES]; 
} 
- (void)ImageCropViewController:(ImageCropViewController *)controller didFinishCroppingImage:(UIImage *)croppedImage{ 
    image = croppedImage; 
    imageView.image = croppedImage; 
    [[self navigationController] popViewControllerAnimated:YES]; 
} 
- (void)ImageCropViewControllerDidCancel:(ImageCropViewController *)controller{ 
    imageView.image = image; 
    [[self navigationController] popViewControllerAnimated:YES]; 
} 

Answer 4

için aşağıdaki bağlantıya bakınız. [Açık Kaynak:

aşağıdaki yöntemle doğru cropFrame yumruk almalısınız

-(CGRect)cropRectForFrame:(CGRect)frame 
{ 
    // NSAssert(self.contentMode == UIViewContentModeScaleAspectFit, @"content mode must be aspect fit"); 

    CGFloat widthScale = imageview.superview.bounds.size.width/imageview.image.size.width; 
    CGFloat heightScale = imageview.superview.bounds.size.height/imageview.image.size.height; 

    float x, y, w, h, offset; 
    if (widthScale<heightScale) { 
     offset = (imageview.superview.bounds.size.height - (imageview.image.size.height*widthScale))/2; 
     x = frame.origin.x/widthScale; 
     y = (frame.origin.y-offset)/widthScale; 
     w = frame.size.width/widthScale; 
     h = frame.size.height/widthScale; 
    } else { 
     offset = (imageview.superview.bounds.size.width - (imageview.image.size.width*heightScale))/2; 
     x = (frame.origin.x-offset)/heightScale; 
     y = frame.origin.y/heightScale; 
     w = frame.size.width/heightScale; 
     h = frame.size.height/heightScale; 
    } 
    return CGRectMake(x, y, w, h); 
} 

Sonra bu sizin için iyi bir kaynak olabilir kırpılmış imajını

- (UIImage *)imageByCropping:(UIImage *)image toRect:(CGRect)rect 
{ 
    // you need to update scaling factor value if deice is not retina display 
    UIGraphicsBeginImageContextWithOptions(rect.size, 
              /* your view opaque */ NO, 
              /* scaling factor */ 2.0); 

    // stick to methods on UIImage so that orientation etc. are automatically 
    // dealt with for us 
    [image drawAtPoint:CGPointMake(-rect.origin.x, -rect.origin.y)]; 

    UIImage *result = UIGraphicsGetImageFromCurrentImageContext(); 
    UIGraphicsEndImageContext(); 

    return result; 
}