小编给大家分享一下IOS中如何实现照片编辑的view封装，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！

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IOS 照片编辑的view封装

该控件有旋转，缩放，拖动，剪裁的功能，封装成了一个ImageCropperView类

需要导入的库：QuartzCore.framework

ImageCopperView.h

#import 

@protocol ImageCropperDelegate;

@interface ImageCropperView : UIView {
  UIImageView *imageView;
  
  id  delegate;
}

@property (nonatomic, retain) UIImage *image;
@property (nonatomic, retain) UIImage *croppedImage;

@property (nonatomic, assign) id  delegate;

@property (nonatomic, assign) BOOL enable;
@property (nonatomic, assign) BOOL isPaning;

- (void)setup;
- (void)finishCropping;
- (void)reset;

@end

@protocol ImageCropperDelegate 
- (void)changeMoveStateWithCropper:(UIPanGestureRecognizer*)gesture Crop:(ImageCropperView*)imageCrop;
@end

ImageCopperView.m

#import "ImageCropperView.h"
#import 
#include 
#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

对UIImage添加了一个category

UIImage+Rotation.h

#import 

@interface UIImage (Rotation)

- (UIImage *)imageRotatedByRadians:(CGFloat)radians;
- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees;

@end

UIImage+Rotation.m

#import "UIImage+Rotation.h"

/************
 角度=弧度/Pi*180
 弧度=角度/180*Pi
 *************/

CGFloat DegreesToRadians(CGFloat degrees) {return degrees * M_PI / 180;};
CGFloat RadiansToDegrees(CGFloat radians) {return radians * 180/M_PI;};

@implementation UIImage (Rotation)

- (UIImage *)imageRotatedByRadians:(CGFloat)radians
{
  return [self imageRotatedByDegrees:RadiansToDegrees(radians)];
}

- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees
{
  /*****
   CGAffineTransformMakeRotation
   通过指定角度来创建一个旋转矩阵
   CGAffineTransformRotate
   在已存在的矩阵中使用旋转
   *****/
  UIView *rotatedViewBox = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.size.width, self.size.height)];
  CGAffineTransform t = CGAffineTransformMakeRotation(DegreesToRadians(degrees));
  //给view旋转角度
  rotatedViewBox.transform = t;
  CGSize rotatedSize = rotatedViewBox.frame.size;
  [rotatedViewBox release];
  //开始编辑图形上下文
  UIGraphicsBeginImageContext(rotatedSize);
  //定义一个图形上下文
  CGContextRef bitmap = UIGraphicsGetCurrentContext();
  //沿x轴移动rotatedSize.width/2，y轴移动rotatedSize.height
  CGContextTranslateCTM(bitmap, rotatedSize.width/2, rotatedSize.height/2);
  //以原点(左下角)为中心旋转DegreesToRadians(degrees)弧度,正角度逆时针，负角度顺时针
  CGContextRotateCTM(bitmap, DegreesToRadians(degrees));
  //缩放x轴，y轴方向
  CGContextScaleCTM(bitmap, 1.0, -1.0);
  //绘制位图
  CGContextDrawImage(bitmap, CGRectMake(-self.size.width / 2, -self.size.height / 2, self.size.width, self.size.height), [self CGImage]);
  //赋值给UIImage
  UIImage *resImage = UIGraphicsGetImageFromCurrentImageContext();
  //结束绘制
  UIGraphicsEndImageContext();
  return resImage; 
}

@end;

ViewController.m

#import "ViewController.h"
#import 
#import "ImagecropperView.h"

@interface ViewController (){
}

@property (nonatomic, retain) IBOutlet ImageCropperView *cropper;
@property (nonatomic, retain) IBOutlet UIImageView *result;
@property (retain, nonatomic) IBOutlet UIImageView *resultSecond;
@property (nonatomic, retain) IBOutlet UIButton *btn;
@property (retain, nonatomic) IBOutlet ImageCropperView *cropperSecond;
@property (retain, nonatomic) IBOutlet UIButton *cropButton;

@end

@implementation ViewController
//@synthesize cropper, result, btn;

- (void)viewDidLoad
{
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
  _cropper.layer.borderWidth = 1.0;
  _cropper.layer.borderColor = [UIColor blueColor].CGColor;
  _cropper.delegate = self;
  [_cropper setup];
  _cropper.image = [UIImage imageNamed:@"2.jpg"];
  [_btn addTarget:self action:@selector(buttonClicked) forControlEvents:UIControlEventTouchUpInside];
  
  _cropperSecond.layer.borderColor = [UIColor blackColor].CGColor;
  _cropperSecond.layer.borderWidth = 2.0;
  _cropperSecond.delegate = self;
  [_cropperSecond setup];
  _cropperSecond.image = [UIImage imageNamed:@"1.jpg"];
  [_cropButton addTarget:self action:@selector(tapCropButton) forControlEvents:UIControlEventTouchUpInside];
}

- (void)buttonClicked
{
  if ([_btn.currentTitle isEqualToString:@"Crop1"]) {
    [_cropper finishCropping];//保存
    _result.image = _cropper.croppedImage;
    _cropper.hidden = YES;
    [_btn setTitle:@"Back" forState:UIControlStateNormal];
    [_btn setTitle:@"Back" forState:UIControlStateHighlighted];
  }else
  {
    [_cropper reset];
    _cropper.hidden = NO;
    [_btn setTitle:@"Crop1" forState:UIControlStateNormal];
    [_btn setTitle:@"Crop1" forState:UIControlStateHighlighted];
    _result.image = nil;
  }
  _cropperSecond.enable = YES;
  _cropper.enable = YES;
}

- (void)tapCropButton{
  if ([_cropButton.currentTitle isEqualToString:@"Crop2"]) {
    [_cropperSecond finishCropping];
    _cropperSecond.enable = NO;
    _resultSecond.image = _cropperSecond.croppedImage;
    _cropperSecond.hidden = YES;
    [_cropButton setTitle:@"Back" forState:UIControlStateNormal];
    [_cropButton setTitle:@"Back" forState:UIControlStateHighlighted];
  }else
  {
    [_cropperSecond reset];
    
    _cropperSecond.hidden = NO;
    [_cropButton setTitle:@"Crop2" forState:UIControlStateNormal];
    [_cropButton setTitle:@"Crop2" forState:UIControlStateHighlighted];
    _resultSecond.image = nil;
  }
  _cropperSecond.enable = YES;
  _cropper.enable = YES;
}

#pragma mark - ImageCropperDelegate
- (void)changeMoveStateWithCropper:(UIPanGestureRecognizer*)gesture Crop:(ImageCropperView*)imageCrop{
  if (gesture.state == UIGestureRecognizerStateEnded) {    
    NSLog(@"点击编辑器结束,两个_cropper都可以进行编辑");
    _cropperSecond.enable = YES;
    _cropper.enable = YES;
  }
}


- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event;
{
//判断点击在控件上
  UITouch *touch = [touches anyObject];
  if ([_cropper pointInside:[touch locationInView:_cropper] withEvent:nil]) {
    NSLog(@"_cropper1 被触摸，禁用_cropper2");
    _cropperSecond.enable = NO;
  }else if ([_cropperSecond pointInside:[touch locationInView:_cropperSecond] withEvent:nil]){
    NSLog(@"_cropper2 被触摸,禁用_cropper1");
    _cropper.enable = NO;
  }
}

- (void)dealloc {
  [_cropperSecond release];
  [_cropButton release];
  [_resultSecond release];
  [super dealloc];
}
- (void)viewDidUnload {
  [self setCropperSecond:nil];
  [self setCropButton:nil];
  [self setResultSecond:nil];
  [super viewDidUnload];
}
@end

截图：

最后要注意，因为我是用xib做的，拖上去的UIView要将其Class改成ImageCropperView

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