Example of using BJImageCropper

Example.m

- (void)displayCrop {
    ImageCropViewController *crop = [[ImageCropViewController alloc] init];
    
    NSMutableDictionary *imageInfo = [self getImageInfo:currentImage];
    crop.image = [UIImage imageWithContentsOfFile:[imageInfo getStringSetting:@"Location" withDefault:@""]];
    
    crop.cropSet = ^(CGRect newCrop, ImageCropViewController* imageCropView) {
        NSMutableDictionary *imageInfo = [self getImageInfo:currentImage];
        [imageInfo saveRectSetting:@"Crop" withValue:newCrop];
        
        if (self.isViewLoaded) {
            [self addImageWithInfo:imageInfo andIndex:currentImage];
        }
    
        [self hideModalViewControllerAnimated:YES];
    };
    
    crop.cropCancel = ^(ImageCropViewController* imageCropView) {
        [self hideModalViewControllerAnimated:YES];       
    };
    
    if ([[imageInfo allKeys] containsObject:@"Crop"]) {
        crop.defaultCrop = [imageInfo getRectSetting:@"Crop"];
    }
    

    crop.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    [self showModalViewController:crop animated:YES];
}

ImageCropViewController.m

//
//  ImageCropViewController.m
//
//  Created by Barrett Jacobsen on 6/23/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "ImageCropViewController.h"
#import <QuartzCore/QuartzCore.h>


@implementation ImageCropViewController
@synthesize image;
@synthesize cropSet;
@synthesize cropCancel;
@dynamic defaultCrop;

#pragma mark - View lifecycle
- (CGRect)defaultCrop {
    return defaultCrop;
}

- (void)setDefaultCrop:(CGRect)newCrop {
    hasSetDefaultCrop = YES;
    defaultCrop = newCrop;
}

- (void)viewDidLoad {
    [super viewDidLoad];
        
    self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"tactile_noise.png"]];
    
    imageCropper = [[BJImageCropper alloc] initWithImage:image andMaxSize:CGSizeMake(1024, 625)];
    [self.view addSubview:imageCropper];
    if (hasSetDefaultCrop) imageCropper.crop = self.defaultCrop;
    imageCropper.center = self.view.center;
    imageCropper.imageView.layer.shadowColor = [[UIColor blackColor] CGColor];
    imageCropper.imageView.layer.shadowRadius = 3.0f;
    imageCropper.imageView.layer.shadowOpacity = 0.8f;
    imageCropper.imageView.layer.shadowOffset = CGSizeMake(1, 1);
    
}

- (void)viewDidUnload {
    [super viewDidUnload];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
	return UIInterfaceOrientationIsLandscape(interfaceOrientation);
}

- (IBAction)didPressDone:(id)sender {
    if (self.cropSet != nil) {
        self.cropSet(imageCropper.crop, self);
    }
}

- (IBAction)didPressCancel:(id)sender {
    if (self.cropCancel != nil) {
        self.cropCancel(self);
    }
}


+ (UIImage*) getImage:(UIImage*)image croppedToRect:(CGRect)rect {
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    // translated rectangle for drawing sub image 
    CGRect drawRect = CGRectMake(-rect.origin.x, -rect.origin.y, image.size.width, image.size.height);
    
    // clip to the bounds of the image context
    // not strictly necessary as it will get clipped anyway?
    CGContextClipToRect(context, CGRectMake(0, 0, rect.size.width, rect.size.height));
    
    // draw image
    [image drawInRect:drawRect];
    
    // grab image
    UIImage* croppedImage = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    
    return croppedImage;
}

@end