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ios 图片裁剪

IOS 额外说明

收录于:43天前

1. 在此演示中,您选择一个相册和拍摄的照片,裁剪它们,然后显示它们。

主要通过LJPhotoCutViewController类用于裁剪照片,然后通过block返回裁剪后的照片。具体用法如下:

LJPhotoCutViewController *_cutVC = [[LJPhotoCutViewController alloc] initWithImage:image cropFrame:CGRectMake(0, (kDEVICEHEIGHT-kDEVICEWIDTH*_scale)/2, kDEVICEWIDTH, kDEVICEWIDTH*_scale) limitScaleRatio:1];
    __weak typeof(self) weakself = self;
    [_cutVC setSubmitblock:^(UIViewController *viewController , UIImage *image) {
        weakself.LJImageView.image = image;
        NSLog(@"裁剪图片完毕");
    }];
    _cutVC.cancelblock = ^(UIViewController *viewController){
        NSLog(@"取消了裁剪图片");
    };
    [self.navigationController pushViewController:_cutVC animated:YES];
2.   LJPhotoCutViewController源代码(.m和.h文件)

#import "LJPhotoCutViewController.h"
#import "UIView+RGSize.h"

#define SCALE_FRAME_Y 100.0f
#define BOUNDCE_DURATION 0.3f

@interface LJPhotoCutViewController ()

@property (nonatomic, strong) UIImage *originalImage;
@property (nonatomic, strong) UIImage *editedImage;

@property (nonatomic, strong) UIImageView *showImgView;
@property (nonatomic, strong) UIView *overlayView;
@property (nonatomic, strong) UIView *ratioView;

@property (nonatomic, assign) CGRect oldFrame;
@property (nonatomic, assign) CGRect largeFrame;
@property (nonatomic, assign) CGFloat limitRatio;

@property (nonatomic, assign) CGRect latestFrame;

@end

@implementation LJPhotoCutViewController

#pragma mark -- dealloc
- (void)dealloc
{
    self.originalImage = nil;
    self.showImgView = nil;
    self.editedImage = nil;
    self.overlayView = nil;
    self.ratioView = nil;
}

#pragma mark - LifeCycle
- (void)viewDidLoad
{
    [super viewDidLoad];
    [self initNav];
    [self initSubView];
    [self initControlBtn];
    [self addGestureRecognizers];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:YES];
    [[UIApplication sharedApplication] setStatusBarHidden:YES];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:YES];
    [[UIApplication sharedApplication] setStatusBarHidden:NO];
}

- (id)initWithImage:(UIImage *)originalImage
          cropFrame:(CGRect)cropFrame
    limitScaleRatio:(NSInteger)limitRatio
{
    if (self = [super init])
    {
        self.cropFrame = cropFrame;
        self.limitRatio = limitRatio;
        self.originalImage = originalImage;
    }
    return self;
}

- (void)initNav
{
    //顶部透明条
    UIView *_topBar = [[UIView alloc]initWithFrame:CGRectMake(0,0,kDEVICEWIDTH,64)];
    _topBar.backgroundColor = [UIColor blackColor];
    _topBar.alpha = 0.5;
    [self.view addSubview:_topBar];
    [self.view bringSubviewToFront:_topBar];
    
    UILabel *_currentPhotoLabel = UILabel.new;
    _currentPhotoLabel.frame = CGRectMake(0, 22 + 5, kDEVICEWIDTH, 20);
    _currentPhotoLabel.textColor = [UIColor whiteColor];
    _currentPhotoLabel.font = loadFont(20);
    _currentPhotoLabel.text = @"图片裁剪";
    _currentPhotoLabel.textAlignment = NSTextAlignmentCenter;
    [_topBar addSubview:_currentPhotoLabel];
}

#pragma mark - Private
- (void)initSubView
{
    self.showImgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 240)];
    [self.showImgView setMultipleTouchEnabled:YES];
    [self.showImgView setUserInteractionEnabled:YES];
    [self.showImgView setImage:self.originalImage];
    
    // scale to fit the screen
    CGFloat oriWidth = self.cropFrame.size.width;
    CGFloat oriHeight = self.originalImage.size.height * (oriWidth / self.originalImage.size.width);
    CGFloat oriX = self.cropFrame.origin.x + (self.cropFrame.size.width - oriWidth) / 2;
    CGFloat oriY = self.cropFrame.origin.y + (self.cropFrame.size.height - oriHeight) / 2;
    self.oldFrame = CGRectMake(oriX, oriY, oriWidth, oriHeight);
    self.latestFrame = self.oldFrame;
    self.showImgView.frame = self.oldFrame;
    self.largeFrame = CGRectMake(0, 0, self.limitRatio * self.oldFrame.size.width, self.limitRatio * self.oldFrame.size.height);
    
    [self.view addSubview:self.showImgView];
    
    self.overlayView = [[UIView alloc] initWithFrame:self.view.bounds];
    self.overlayView.alpha = .5f;
    self.overlayView.backgroundColor = [UIColor blackColor];
    self.overlayView.userInteractionEnabled = NO;
    self.overlayView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
    [self.view addSubview:self.overlayView];
    
    self.ratioView = [[UIView alloc] initWithFrame:self.cropFrame];
    self.ratioView.layer.borderColor = [UIColor whiteColor].CGColor;
    self.ratioView.layer.borderWidth = 1.0f;
    self.ratioView.autoresizingMask = UIViewAutoresizingNone;
    [self.view addSubview:self.ratioView];
    [self overlayClipping];
    [self.view setBackgroundColor:[UIColor blackColor]];
}

- (void)overlayClipping
{
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    CGMutablePathRef path = CGPathCreateMutable();
    // Left side of the ratio view
    CGPathAddRect(path, nil, CGRectMake(0, 0,self.cropFrame.origin.x,self.overlayView.frame.size.height));
    // Right side of the ratio view
    CGPathAddRect(path, nil, CGRectMake(self.cropFrame.origin.x + self.ratioView.frame.size.width,
                                        0,
                                        self.overlayView.frame.size.width - self.ratioView.frame.origin.x - self.cropFrame.size.width,
                                        self.overlayView.frame.size.height));
    // Top side of the ratio view
    CGPathAddRect(path, nil, CGRectMake(0, 0,
                                        self.overlayView.frame.size.width,
                                        self.cropFrame.origin.y));
    // Bottom side of the ratio view
    CGPathAddRect(path, nil, CGRectMake(0,
                                        self.cropFrame.origin.y + self.ratioView.frame.size.height,
                                        self.overlayView.frame.size.width,
                                        self.overlayView.frame.size.height - self.ratioView.frame.origin.y + self.cropFrame.size.height));
    maskLayer.path = path;
    self.overlayView.layer.mask = maskLayer;
    CGPathRelease(path);
}

- (void)initControlBtn
{
    UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height - 70.0f, self.view.frame.size.width, 70)];
    backView.backgroundColor = [UIColor colorWithRed:40/255.f green:40/255.f blue:40/255.f alpha:0.8];
    
    UIButton *cancelBtn = [self buttonWithTitle:@"取消"];
    cancelBtn.frame = CGRectMake(0, 10, 100, 50);
    [cancelBtn addTarget:self action:@selector(cancel:) forControlEvents:UIControlEventTouchUpInside];
    [backView addSubview:cancelBtn];
    
    UIButton *confirmBtn = [self buttonWithTitle:@"确定"];
    confirmBtn.frame = CGRectMake(self.view.frame.size.width - 100.0f, 10, 100, 50);
    [confirmBtn addTarget:self action:@selector(confirm:) forControlEvents:UIControlEventTouchUpInside];
    [backView addSubview:confirmBtn];
    [self.view addSubview:backView];
}

- (UIButton *)buttonWithTitle:(NSString *)title
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.backgroundColor = [UIColor clearColor];
    [button setTitle:title forState:UIControlStateNormal];
    [button.titleLabel setFont:[UIFont boldSystemFontOfSize:18.0f]];
    [button.titleLabel setTextAlignment:NSTextAlignmentCenter];
    [button.titleLabel setLineBreakMode:NSLineBreakByWordWrapping];
    [button.titleLabel setNumberOfLines:0];
    [button setTitleEdgeInsets:UIEdgeInsetsMake(5.0f, 5.0f, 5.0f, 5.0f)];
    return button;
}

#pragma mark - Action
- (void)confirm:(id)sender
{
    if (self.submitblock){
        self.submitblock(self, [self getSubImage]);
    }
    [self backButtonClick];
}

- (void)cancel:(id)sender
{
    if (self.cancelblock) {
         self.cancelblock(self);
    }
    [self backButtonClick];
}

#pragma mark - Gestures
// register all gestures
- (void) addGestureRecognizers
{
    // add pinch gesture
    UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)];
    [self.view addGestureRecognizer:pinchGestureRecognizer];
    
    // add pan gesture
    UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)];
    [self.view addGestureRecognizer:panGestureRecognizer];
}

// pinch gesture handler
- (void) pinchView:(UIPinchGestureRecognizer *)pinchGestureRecognizer
{
    UIView *view = self.showImgView;
    if (pinchGestureRecognizer.state == UIGestureRecognizerStateBegan || pinchGestureRecognizer.state == UIGestureRecognizerStateChanged)
    {
        view.transform = CGAffineTransformScale(view.transform, pinchGestureRecognizer.scale, pinchGestureRecognizer.scale);
        pinchGestureRecognizer.scale = 1;
    }
    else if (pinchGestureRecognizer.state == UIGestureRecognizerStateEnded)
    {
        CGRect newFrame = self.showImgView.frame;
        newFrame = [self handleScaleOverflow:newFrame];
        newFrame = [self handleBorderOverflow:newFrame];
        [UIView animateWithDuration:BOUNDCE_DURATION animations:^{
            self.showImgView.frame = newFrame;
            self.latestFrame = newFrame;
        }];
    }
}

// pan gesture handler
- (void) panView:(UIPanGestureRecognizer *)panGestureRecognizer
{
    UIView *view = self.showImgView;
    if (panGestureRecognizer.state == UIGestureRecognizerStateBegan || panGestureRecognizer.state == UIGestureRecognizerStateChanged) {
        // calculate accelerator
        CGFloat absCenterX = self.cropFrame.origin.x + self.cropFrame.size.width / 2;
        CGFloat absCenterY = self.cropFrame.origin.y + self.cropFrame.size.height / 2;
        CGFloat scaleRatio = self.showImgView.frame.size.width / self.cropFrame.size.width;
        CGFloat acceleratorX = 1 - ABS(absCenterX - view.center.x) / (scaleRatio * absCenterX);
        CGFloat acceleratorY = 1 - ABS(absCenterY - view.center.y) / (scaleRatio * absCenterY);
        CGPoint translation = [panGestureRecognizer translationInView:view.superview];
        [view setCenter:(CGPoint){view.center.x + translation.x * acceleratorX, view.center.y + translation.y * acceleratorY}];
        [panGestureRecognizer setTranslation:CGPointZero inView:view.superview];
    }
    else if (panGestureRecognizer.state == UIGestureRecognizerStateEnded) {
        // bounce to original frame
        CGRect newFrame = self.showImgView.frame;
        newFrame = [self handleBorderOverflow:newFrame];
        [UIView animateWithDuration:BOUNDCE_DURATION animations:^{
            self.showImgView.frame = newFrame;
            self.latestFrame = newFrame;
        }];
    }
}

#pragma mark - Handle
- (CGRect)handleScaleOverflow:(CGRect)newFrame
{
    // bounce to original frame
    CGPoint oriCenter = CGPointMake(newFrame.origin.x + newFrame.size.width/2, newFrame.origin.y + newFrame.size.height/2);
    if (newFrame.size.width < self.oldFrame.size.width) {
        newFrame = self.oldFrame;
    }
    if (newFrame.size.width > self.largeFrame.size.width) {
        newFrame = self.largeFrame;
    }
    newFrame.origin.x = oriCenter.x - newFrame.size.width/2;
    newFrame.origin.y = oriCenter.y - newFrame.size.height/2;
    return newFrame;
}

- (CGRect)handleBorderOverflow:(CGRect)newFrame
{
    // horizontally
    if (newFrame.origin.x > self.cropFrame.origin.x) newFrame.origin.x = self.cropFrame.origin.x;
    if (CGRectGetMaxX(newFrame) < self.cropFrame.size.width) newFrame.origin.x = self.cropFrame.size.width - newFrame.size.width;
    // vertically
    if (newFrame.origin.y > self.cropFrame.origin.y) newFrame.origin.y = self.cropFrame.origin.y;
    if (CGRectGetMaxY(newFrame) < self.cropFrame.origin.y + self.cropFrame.size.height) {
        newFrame.origin.y = self.cropFrame.origin.y + self.cropFrame.size.height - newFrame.size.height;
    }
    // adapt horizontally rectangle
    if (self.showImgView.frame.size.width > self.showImgView.frame.size.height && newFrame.size.height <= self.cropFrame.size.height) {
        newFrame.origin.y = self.cropFrame.origin.y + (self.cropFrame.size.height - newFrame.size.height) / 2;
    }
    return newFrame;
}

- (UIImage *)getSubImage
{
    CGRect squareFrame = self.cropFrame;
    CGFloat scaleRatio = self.latestFrame.size.width / self.originalImage.size.width;
    CGFloat x = (squareFrame.origin.x - self.latestFrame.origin.x) / scaleRatio;
    CGFloat y = (squareFrame.origin.y - self.latestFrame.origin.y) / scaleRatio;
    CGFloat w = squareFrame.size.width / scaleRatio;
    CGFloat h = squareFrame.size.height / scaleRatio;
    if (self.latestFrame.size.width < self.cropFrame.size.width) {
        CGFloat newW = self.originalImage.size.width;
        CGFloat newH = newW * (self.cropFrame.size.height / self.cropFrame.size.width);
        x = 0; y = y + (h - newH) / 2;
        w = newH; h = newH;
    }
    if (self.latestFrame.size.height < self.cropFrame.size.height) {
        CGFloat newH = self.originalImage.size.height;
        CGFloat newW = newH * (self.cropFrame.size.width / self.cropFrame.size.height);
        x = x + (w - newW) / 2; y = 0;
        w = newH; h = newH;
    }
    CGRect myImageRect = CGRectMake(x, y, w, h);
    CGImageRef imageRef = self.originalImage.CGImage;
    CGImageRef subImageRef = CGImageCreateWithImageInRect(imageRef, myImageRect);
    CGSize size;
    size.width = myImageRect.size.width;
    size.height = myImageRect.size.height;
    UIGraphicsBeginImageContext(size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextDrawImage(context, myImageRect, subImageRef);
    UIImage* smallImage = [UIImage imageWithCGImage:subImageRef];
    UIGraphicsEndImageContext();
    CGImageRelease(subImageRef);
    return smallImage;
}

@end
#import <UIKit/UIKit.h>

typedef void(^submitBlock)(UIViewController *viewController , UIImage *image);
typedef void(^cancelBlock)(UIViewController *viewController);

@interface LJPhotoCutViewController : CHBaseViewController

@property (nonatomic, copy) submitBlock submitblock;
@property (nonatomic, copy) cancelBlock cancelblock;
@property (nonatomic, assign) CGRect cropFrame;

- (id)initWithImage:(UIImage *)originalImage
          cropFrame:(CGRect)cropFrame
    limitScaleRatio:(NSInteger)limitRatio;

@end

3、本demo的UI界面(包括相册和拍照图片的获取)

#import "LJPhotoViewController.h"
#import "LJPhotoCutViewController.h"

// 经典16:9裁剪
double deafaultScale = 9.0/16.0;

@interface LJPhotoViewController ()<UINavigationControllerDelegate, UIImagePickerControllerDelegate>
{
    UIImageView *_LJImageView;
}
@property (nonatomic, strong) UIImagePickerController *imagePickerController;

@end

@implementation LJPhotoViewController

#pragma mark -- life cycle
- (void)viewDidLoad
{
    [super viewDidLoad];
    
    [self setTopNavBackButton];
    [self setTopNavBarTitle:@"图片裁剪"];
    [self.view addSubview:self.LJImageView];
    [self createTestButton];
    //[self requestNetData:newImageUrl];
}

- (UIImagePickerController *)imagePickerController
{
    if (!_imagePickerController)
    {
        _imagePickerController = [[UIImagePickerController alloc] init];
        _imagePickerController.delegate = self;
        _imagePickerController.allowsEditing = YES;
    }
    return _imagePickerController;
}

- (void)createTestButton
{
    UIButton *_cameraBtn = [[UIButton alloc]initWithFrame:CGRectMake(15, kDEVICEHEIGHT - 64 - 64, kDEVICEWIDTH-30, 44)];
    _cameraBtn.backgroundColor = [UIColor grayColor];
    [_cameraBtn addTarget:self action:@selector(cameraSysClick) forControlEvents:UIControlEventTouchUpInside];
    [_cameraBtn setTitle:@"拍照裁剪" forState:UIControlStateNormal];
    _cameraBtn.titleLabel.textColor = [UIColor whiteColor];
    _cameraBtn.layer.cornerRadius = 4;
    [self.view addSubview:_cameraBtn];
    
    UIButton *_photoLibraryBtn = [[UIButton alloc]initWithFrame:CGRectMake(15, kDEVICEHEIGHT - 64, kDEVICEWIDTH-30, 44)];
    _photoLibraryBtn.backgroundColor = [UIColor grayColor];
    [_photoLibraryBtn addTarget:self action:@selector(photoLibraryClick) forControlEvents:UIControlEventTouchUpInside];
    [_photoLibraryBtn setTitle:@"相册裁剪" forState:UIControlStateNormal];
    _photoLibraryBtn.titleLabel.textColor = [UIColor whiteColor];
    _photoLibraryBtn.layer.cornerRadius = 4;
    [self.view addSubview:_photoLibraryBtn];
}

- (void)showImagePickerWithType:(UIImagePickerControllerSourceType)type
               targetController:(UIViewController *)viewController
                          scale:(double)scale
{
    if (type == UIImagePickerControllerSourceTypeCamera)
    {
#if TARGET_IPHONE_SIMULATOR //模拟器
        NSLog(@"请使用真机测试");
        return;
#elif TARGET_OS_IPHONE //真机
        self.imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
#endif
    }
    else if(type == UIImagePickerControllerSourceTypePhotoLibrary)
    {
        self.imagePickerController.sourceType =  UIImagePickerControllerSourceTypePhotoLibrary;
    }
    self.imagePickerController.allowsEditing = YES;
    [viewController presentViewController:self.imagePickerController animated:YES completion:nil];
}

#pragma mark -- 图片裁剪
- (UIImageView*)LJImageView
{
    if (!_LJImageView) {
        _LJImageView = [[UIImageView alloc]init];
        //等比例缩放
        _LJImageView.contentMode = UIViewContentModeScaleAspectFit;
        _LJImageView.frame = CGRectMake((kDEVICEWIDTH - 200)/2.0, 90, 200, 200);
    }
    return _LJImageView;
}

#pragma mark -- 从相册获取的照片拿过来裁剪
- (void)getEditImage:(UIImage*)image targetVC:(UIViewController*)VC
{
    float _scale = 1;//默认
    if(deafaultScale > 0 && deafaultScale <= 1.5){
        _scale = deafaultScale;
    }
    
   LJPhotoCutViewController *_cutVC = [[LJPhotoCutViewController alloc] initWithImage:image cropFrame:CGRectMake(0, (kDEVICEHEIGHT-kDEVICEWIDTH*_scale)/2, kDEVICEWIDTH, kDEVICEWIDTH*_scale) limitScaleRatio:1];
    __weak typeof(self) weakself = self;
    [_cutVC setSubmitblock:^(UIViewController *viewController , UIImage *image) {
        weakself.LJImageView.image = image;
        NSLog(@"裁剪图片完毕");
    }];
    _cutVC.cancelblock = ^(UIViewController *viewController){
        NSLog(@"取消了裁剪图片");
    };
    [self.navigationController pushViewController:_cutVC animated:YES];
}

#pragma mark -- 拍照图片裁剪
- (void)cameraSysClick
{
    [self showImagePickerWithType:UIImagePickerControllerSourceTypeCamera targetController:self scale:deafaultScale];
}

#pragma mark -- 系统相册图片裁剪
- (void)photoLibraryClick
{
   [self showImagePickerWithType:UIImagePickerControllerSourceTypePhotoLibrary targetController:self scale:deafaultScale];
}

#pragma mark -- UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
    UIImage * image = [info objectForKey:UIImagePickerControllerOriginalImage];
    UIImageOrientation imageOrientation=image.imageOrientation;
    
    if(imageOrientation != UIImageOrientationUp)
    {
        UIGraphicsBeginImageContext(image.size);
        [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
        image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    }

    //Creating an image format with an unknown type is an error
    // 方法一:异步赋值
//    dispatch_async(dispatch_get_main_queue(), ^{
//        self.LJImageView.image = image;
//    });
    
    __weak typeof(self) weakself = self;
    [picker dismissViewControllerAnimated:YES completion:^{
        // 方法二:等UIImagePickerController消失后再去调用image
        //weakself.LJImageView.image = image;
        
        //从相册获取的照片拿过来裁剪
        [weakself getEditImage:image targetVC:picker];
    }];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
   [picker dismissViewControllerAnimated:YES completion:^{}];
}

4. 图片裁剪界面


5. 裁剪后渲染



. . .

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