IOS 照片编辑的view封装的实例详解

ImageCopperView.m

#import "ImageCropperView.h"
#import <QuartzCore/QuartzCore.h>
#include <math.h>
#import "UIImage+Rotation.h"

@interface ImageCropperView()
{
  @private
  CGSize _originalImageViewSize;
}

@property (nonatomic, retain) UIImageView *imageView;
@end

@implementation ImageCropperView

@synthesize imageView, image = _image, delegate, croppedImage;

- (void)setup
{
  _enable = YES;
  self.clipsToBounds = YES;
  self.backgroundColor = [UIColor clearColor];
  
  self.imageView = [[[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, self.frame.size.width, self.frame.size.height)] autorelease];
  imageView.userInteractionEnabled = YES;
  [self addSubview:imageView];
  
  UIRotationGestureRecognizer *rotateGes = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateImage:)];
  [imageView addGestureRecognizer:rotateGes];
  [rotateGes release];
  
  UIPinchGestureRecognizer *scaleGes = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scaleImage:)];
  [imageView addGestureRecognizer:scaleGes];
  [scaleGes release];
  
  UIPanGestureRecognizer *moveGes = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(moveImage:)];
  [moveGes setMinimumNumberOfTouches:1];
  [moveGes setMaximumNumberOfTouches:1];
  [imageView addGestureRecognizer:moveGes];
  [moveGes release];
}

- (id)initWithFrame:(CGRect)frame {
  self = [super initWithFrame:frame];
  
  if (self) {
    self.frame = frame;
    [self setup];
  }
  
  return self;
}

float _lastTransX = 0.0, _lastTransY = 0.0;
- (void)moveImage:(UIPanGestureRecognizer *)sender
{
  _isPaning = YES;
  if (delegate&&[delegate respondsToSelector:@selector(changeMoveStateWithCropper:Crop:)]) {
    [delegate changeMoveStateWithCropper:sender Crop:self];
  }else{
    return;
  }
  if (sender.numberOfTouches != 1||_enable == NO) {
    return;
  }
  //获取在视图中手势的触点位置
  CGPoint translatedPoint = [sender translationInView:self];

  if([sender state] == UIGestureRecognizerStateBegan) {
    _lastTransX = 0.0;
    _lastTransY = 0.0;
  }
  
  CGAffineTransform trans = CGAffineTransformMakeTranslation(translatedPoint.x - _lastTransX, translatedPoint.y - _lastTransY);
  //CGAffineTransformConcat将imageView.transform和trans两个动画连续起来
  CGAffineTransform newTransform = CGAffineTransformConcat(imageView.transform, trans);
  _lastTransX = translatedPoint.x;
  _lastTransY = translatedPoint.y;
  NSLog(@"_lastTransX==%f,_lastTransY==%f",_lastTransX,_lastTransY);
  imageView.transform = newTransform;
}

float _lastScale = 1.0;
- (void)scaleImage:(UIPinchGestureRecognizer *)sender
{
  _isPaning = NO;
  if (sender.numberOfTouches != 2||_enable == NO) {
    return;
  }
  
  if([sender state] == UIGestureRecognizerStateBegan) {
    
    _lastScale = 1.0;
    return;
  }
  
  CGFloat scale = [sender scale]/_lastScale;
  
  CGAffineTransform currentTransform = imageView.transform;
  CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);
  [imageView setTransform:newTransform];
  
  _lastScale = [sender scale];
}

float _lastRotation = 0.0;
- (void)rotateImage:(UIRotationGestureRecognizer *)sender
{
  _isPaning = NO;
  if (sender.numberOfTouches != 2||_enable == NO) {
    return;
  }
  
  if([sender state] == UIGestureRecognizerStateEnded) {
    
    _lastRotation = 0.0;
    return;
  }
  
  CGFloat rotation = -_lastRotation + [sender rotation];
  
  CGAffineTransform currentTransform = imageView.transform;
  CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform,rotation);
  [imageView setTransform:newTransform];
  
  _lastRotation = [sender rotation];
  
}

- (void)setImage:(UIImage *)image
{
  if (_image != image) {
    _image = [image retain];
  }
  
  float _imageScale = self.frame.size.width / image.size.width;
  self.imageView.frame = CGRectMake(0, 0, image.size.width*_imageScale, image.size.height*_imageScale);
  _originalImageViewSize = CGSizeMake(image.size.width*_imageScale, image.size.height*_imageScale);
  imageView.image = image;
  imageView.center = CGPointMake(self.frame.size.width/2.0, self.frame.size.height/2.0);
}

- (void)finishCropping {
  float zoomScale = [[self.imageView.layer valueForKeyPath:@"transform.scale.x"] floatValue];
  float rotate = [[self.imageView.layer valueForKeyPath:@"transform.rotation.z"] floatValue];
  
  float _imageScale = _image.size.width/_originalImageViewSize.width;
  CGSize cropSize = CGSizeMake(self.frame.size.width/zoomScale, self.frame.size.height/zoomScale);
  CGPoint cropperViewOrigin = CGPointMake((0.0 - self.imageView.frame.origin.x)/zoomScale,
                      (0.0 - self.imageView.frame.origin.y)/zoomScale);
  
  if((NSInteger)cropSize.width % 2 == 1)
  {
    cropSize.width = ceil(cropSize.width);
  }
  if((NSInteger)cropSize.height % 2 == 1)
  {
    cropSize.height = ceil(cropSize.height);
  }
  
  CGRect CropRectinImage = CGRectMake((NSInteger)(cropperViewOrigin.x*_imageScale) ,(NSInteger)( cropperViewOrigin.y*_imageScale), (NSInteger)(cropSize.width*_imageScale),(NSInteger)(cropSize.height*_imageScale));
  
  UIImage *rotInputImage = [self.image imageRotatedByRadians:rotate];
  CGImageRef tmp = CGImageCreateWithImageInRect([rotInputImage CGImage], CropRectinImage);
  self.croppedImage = [UIImage imageWithCGImage:tmp scale:self.image.scale orientation:self.image.imageOrientation];
  CGImageRelease(tmp);
}

- (void)reset
{
  self.imageView.transform = CGAffineTransformIdentity;
}

- (void)dealloc {
  self.image = nil;
  self.croppedImage = nil;
  self.imageView = nil;
  
  [super dealloc];
}

@end

								 
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