iOS UIImage 图片裁剪 , 旋转裁剪 , 缩放裁剪 , 平移裁剪 有demo下载

这里是全部代码，可以直接拷贝使用：
先看功能，如下图，裁剪前：

裁剪后：

代码：
CameraCutView.h

//
//  CameraCutView.h
//  ImageCut
//
//  Created by huizai on 2018/7/3.
//  Copyright © 2018年 huizai. All rights reserved.
//

#import 

@interface CameraCutView : UIView
@property (nonatomic)  UIImage * mTargetImage;
@property (nonatomic)  UIImage * mResultImage;
@property (nonatomic,assign) CGFloat ImgCutHeight;
@property (nonatomic,assign) CGSize originalImageViewSize;

-(void) showCoverViewWithTargetImg;
//frame 相对于当前屏幕坐标 当前屏幕当中的裁剪范围
-(UIImage*) cutImageWithSpecificRect:(CGRect)frame;
@end

CameraCutView.m

//
//  CameraCutView.m
//  ImageCut
//
//  Created by huizai on 2018/7/3.
//  Copyright © 2018年 huizai. All rights reserved.
//

#import "CameraCutView.h"
#import "UIImage+Util.h"

@implementation CameraCutView{
    UIView  *_mCameraBgView;
}

- (id)init{
    if (self = [super init]) {
        [self initUI];
        return self;
    }
    return nil;
}

- (void)initUI{
    self.backgroundColor = [UIColor blackColor];
}

-(void) showCoverViewWithTargetImg
{
    [_mCameraBgView setBackgroundColor:[UIColor clearColor]];
    float scaleValue = [self getScaleNum:_mTargetImage];
    _mTargetImage = [self scaleImage:_mTargetImage toScale:scaleValue];
    if (_mTargetImage != nil)
    {
        _mCameraBgView = [[UIImageView alloc] initWithImage:_mTargetImage];
    }
    float _imageScale = self.frame.size.width / _mTargetImage.size.width;
    _mCameraBgView.frame = CGRectMake(0, 0, _mTargetImage.size.width*_imageScale, _mTargetImage.size.height*_imageScale);
    _originalImageViewSize = CGSizeMake(_mTargetImage.size.width*_imageScale, _mTargetImage.size.height*_imageScale);
    _mCameraBgView.center = CGPointMake(self.frame.size.width/2.0, self.frame.size.height/2.0);
    [self addSubview:_mCameraBgView];
    [self addCoverView];
    [self setUserGesture];
}

- (void)addCoverView{
    UIImageView * coverImage = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, JYScreen_width, RATIO(JYScreen_height))];
    UIImage * image = [UIImage imageNamed:@"zhezhao"];
    image = [image resizeImageWithTop:0.9 andLeft:0 andBottom:0.95 andRight:0];
    coverImage.image = image;
    [self addSubview:coverImage];
}

-(void) setUserGesture
{
    [_mCameraBgView setUserInteractionEnabled:YES];
    //添加移动手势
    UIPanGestureRecognizer *moveGes = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(moveImage:)];
    [moveGes setMinimumNumberOfTouches:1];
    [moveGes setMaximumNumberOfTouches:1];
    [_mCameraBgView addGestureRecognizer:moveGes];
    //添加缩放手势
    UIPinchGestureRecognizer *scaleGes = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scaleImage:)];
    [_mCameraBgView addGestureRecognizer:scaleGes];
    //    //添加旋转手势
    UIRotationGestureRecognizer *rotateGes = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateImage:)];
    [_mCameraBgView addGestureRecognizer:rotateGes];
}

float _lastTransX = 0.0, _lastTransY = 0.0;
- (void)moveImage:(UIPanGestureRecognizer *)sender
{
    CGPoint translatedPoint = [sender translationInView:self];

    if([sender state] == UIGestureRecognizerStateBegan) {
        _lastTransX = 0.0;
        _lastTransY = 0.0;
    }

    CGAffineTransform trans = CGAffineTransformMakeTranslation(translatedPoint.x - _lastTransX, translatedPoint.y - _lastTransY);
    CGAffineTransform newTransform = CGAffineTransformConcat(_mCameraBgView.transform, trans);
    _lastTransX = translatedPoint.x;
    _lastTransY = translatedPoint.y;

    if ([self isCanMove:newTransform])
    {
        _mCameraBgView.transform = newTransform;
    }

}
float _lastScale = 1.0;
- (void)scaleImage:(UIPinchGestureRecognizer *)sender
{
    if([sender state] == UIGestureRecognizerStateBegan) {

        _lastScale = 1.0;
        return;
    }

    CGFloat scale = [sender scale]/_lastScale;

    CGAffineTransform currentTransform = _mCameraBgView.transform;
    CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);
    [_mCameraBgView setTransform:newTransform];

    _lastScale = [sender scale];
}

float _lastRotation = 0.0;
- (void)rotateImage:(UIRotationGestureRecognizer *)sender
{
    if([sender state] == UIGestureRecognizerStateEnded) {

        _lastRotation = 0.0;
        return;
    }

    CGFloat rotation = -_lastRotation + [sender rotation];

    CGAffineTransform currentTransform = _mCameraBgView.transform;
    CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform,rotation);
    [_mCameraBgView setTransform:newTransform];

    _lastRotation = [sender rotation];

}


/***
 方法名称：cutImageWithSpecificRect
 方法用途：根据特定的区域对图片进行裁剪
 方法说明：核心裁剪方法CGImageCreateWithImageInRect(CGImageRef image,CGRect rect)
 ***/
-(UIImage*) cutImageWithSpecificRect:(CGRect)frame;
{
    float zoomScale = [[_mCameraBgView.layer valueForKeyPath:@"transform.scale.x"] floatValue];
    float rotate = [[_mCameraBgView.layer valueForKeyPath:@"transform.rotation.z"] floatValue];

    float _imageScale = _mTargetImage.size.width/_originalImageViewSize.width;
    //裁剪区域的Size
    // CGSize cropSize = CGSizeMake(320.0/zoomScale, 120.0/zoomScale);
    CGSize cropSize = CGSizeMake(frame.size.width/zoomScale, frame.size.height/zoomScale);
    //裁剪区域的Origin
    // CGPoint cropperViewOrigin = CGPointMake((0.0 - _mCameraBgView.frame.origin.x)/zoomScale,
    //                                         ((JYScreen_height - _ImgCutHeight)/2 - _mCameraBgView.frame.origin.y)/zoomScale);
    CGPoint cropperViewOrigin = CGPointMake((0.0 - _mCameraBgView.frame.origin.x + frame.origin.x)/zoomScale,
                                            (-_mCameraBgView.frame.origin.y)/zoomScale + 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 = [_mTargetImage imageRotatedByRadians:rotate];
    CGImageRef tmp = CGImageCreateWithImageInRect([rotInputImage CGImage], CropRectinImage);
    self.mResultImage = [UIImage imageWithCGImage:tmp scale:_mTargetImage.scale orientation:_mTargetImage.imageOrientation];
    CGImageRelease(tmp);
    return self.mResultImage;
}

-(BOOL) isCanMove:(CGAffineTransform ) newTransform
{
    if (_mCameraBgView.frame.size.height/2  - fabs(newTransform.ty)<=0 ||
        _mCameraBgView.frame.size.width/2 - fabs(newTransform.tx)  <=0)
    {
        return NO;

    } else
    {
        return YES;
    }

}

/***
 方法名称：scaleImage:toScale:
 方法用途：图片的伸缩处理
 方法说明：scaleSize:放大或缩小的倍数
 ***/
- (UIImage *)scaleImage:(UIImage *)image toScale:(float)scaleSize
{
    UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize));

    [image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)];

    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return scaledImage;
}
/***
 方法名称：getScaleNum:
 方法用途：根据图片的宽度为基准，来获取图片伸缩放大的倍数
 方法说明：
 ***/
-(float) getScaleNum:(UIImage *) targetImg
{
    CGRect r = [UIScreen mainScreen].bounds;
    float preWidth = targetImg.size.width;
    float scaleValue = 1;

    scaleValue = r.size.width/preWidth;

    return scaleValue;
}
//图片复原
- (void)reset
{
    _mCameraBgView.transform = CGAffineTransformIdentity;
}

@end

UIImage+Util.h

//
//  UIImage+Util.h
//  ImageCut
//
//  Created by huizai on 2018/7/3.
//  Copyright © 2018年 huizai. All rights reserved.
//

#import 

@interface UIImage (Util)
//设置的外围不变形内部平铺拉伸
- (UIImage*)resizeImageWithTop:(CGFloat)top andLeft:(CGFloat)left andBottom:(CGFloat)bottom andRight:(CGFloat)right;
- (UIImage *)imageRotatedByRadians:(CGFloat)radians;
- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees;

@end

UIImage+Util.m

//
//  UIImage+Util.m
//  ImageCut
//
//  Created by huizai on 2018/7/3.
//  Copyright © 2018年 huizai. All rights reserved.
//

#import "UIImage+Util.h"

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

@implementation UIImage (Util)
//设置的外围不变形内部平铺拉伸
- (UIImage*)resizeImageWithTop:(CGFloat)top andLeft:(CGFloat)left andBottom:(CGFloat)bottom andRight:(CGFloat)right{
    UIImage *image = self;
    // 设置端盖的值
    CGFloat _top = image.size.height * top;
    CGFloat _left = image.size.width * left;
    CGFloat _bottom = image.size.height * bottom;
    CGFloat _right = image.size.width * right;
    // 设置端盖的值
    UIEdgeInsets edgeInsets = UIEdgeInsetsMake(_top, _left, _bottom, _right);
    // 设置拉伸的模式
    UIImageResizingMode mode = UIImageResizingModeStretch;
    // 拉伸图片
    UIImage *newImage = [image resizableImageWithCapInsets:edgeInsets resizingMode:mode];
    return newImage;
}
- (UIImage *)imageRotatedByRadians:(CGFloat)radians
{
    return [self imageRotatedByDegrees:RadiansToDegrees(radians)];
}
- (UIImage *)imageRotatedByDegrees:(CGFloat)degrees
{
    // calculate the size of the rotated view's containing box for our drawing space
    UIView *rotatedViewBox = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.size.width, self.size.height)];
    CGAffineTransform t = CGAffineTransformMakeRotation(DegreesToRadians(degrees));
    rotatedViewBox.transform = t;
    CGSize rotatedSize = rotatedViewBox.frame.size;


    // Create the bitmap context
    UIGraphicsBeginImageContext(rotatedSize);
    CGContextRef bitmap = UIGraphicsGetCurrentContext();

    // Move the origin to the middle of the image so we will rotate and scale around the center.
    CGContextTranslateCTM(bitmap, rotatedSize.width/2, rotatedSize.height/2);

    //   // Rotate the image context
    CGContextRotateCTM(bitmap, DegreesToRadians(degrees));

    // Now, draw the rotated/scaled image into the context
    CGContextScaleCTM(bitmap, 1.0, -1.0);
    CGContextDrawImage(bitmap, CGRectMake(-self.size.width / 2, -self.size.height / 2, self.size.width, self.size.height), [self CGImage]);

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;

}

@end