Creating image with in the frame of a rectangle pl

问题:

How to create a new image with specified frame in a UIView, the view contains imageviews and buttons also.I also need to get the image in the specified frame as a new image. I've tried this but it not correct.

I need to crop from UIView and make it as a new UIImage.

回答1:

You need to import this framework in your project.

#import <QuartzCore/QuartzCore.h>

And use following code

[imageView.layer setBorderColor: [[UIColor blackColor] CGColor]];
[imageView.layer setBorderWidth: 2.0]; // set border width as per your requirement.

EDITED:

Use any one which you need.

For Get Crop Image:

UIImage *croppedImg = nil;
CGRect cropRect = CGRectMake(AS YOu Need);
croppedImg = [self croppIngimageByImageName:self.imageView.image toRect:cropRect];

Use following method that return UIImage (as You want size of image)

- (UIImage *)croppIngimageByImageName:(UIImage *)imageToCrop toRect:(CGRect)rect
    {
        //CGRect CropRect = CGRectMake(rect.origin.x, rect.origin.y, rect.size.width, rect.size.height+15);

        CGImageRef imageRef = CGImageCreateWithImageInRect([imageToCrop CGImage], rect);
        UIImage *cropped = [UIImage imageWithCGImage:imageRef];
        CGImageRelease(imageRef);

        return cropped;
    }

Here you get Croped Image that return by above method;

OR RESIZING

And also Use following method for specific hight and width with image for Resizing UIImage:

+ (UIImage*)resizeImage:(UIImage*)image withWidth:(int)width withHeight:(int)height
{
    CGSize newSize = CGSizeMake(width, height);
    float widthRatio = newSize.width/image.size.width;
    float heightRatio = newSize.height/image.size.height;

    if(widthRatio > heightRatio)
    {
        newSize=CGSizeMake(image.size.width*heightRatio,image.size.height*heightRatio);
    }
    else
    {
        newSize=CGSizeMake(image.size.width*widthRatio,image.size.height*widthRatio);
    }


    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return newImage;
}

This method return NewImage, with specific size that you want.