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 <UIKit/UIKit.h>@protocol ImageCropperDelegate;@interface ImageCropperView : UIView { UIImageView *imageView; id <ImageCropperDelegate> delegate;}@property (nonatomic, retain) UIImage *image;@property (nonatomic, retain) UIImage *croppedImage;@property (nonatomic, assign) id <ImageCropperDelegate> delegate;@property (nonatomic, assign) BOOL enable;@property (nonatomic, assign) BOOL isPaning;- (void)setup;- (void)finishCropping;- (void)reset;@end@protocol ImageCropperDelegate <NSObject>- (void)changeMoveStateWithCropper:(UIPanGestureRecognizer*)gesture Crop:(ImageCropperView*)imageCrop;@end

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

对UIImage添加了一个category

UIImage+Rotation.h

#import <UIKit/UIKit.h>@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 <QuartzCore/QuartzCore.h>#import "ImagecropperView.h"@interface ViewController ()<ImageCropperDelegate>{}@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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