做项目是经常会遇见需要对图片进行剪裁的情况，下面来点干货
#import <UIKit/UIKit.h>
@protocol PassImageDelegate <NSObject>
-(void)passImage:(UIImage *)image;
@end
@interface CutImgageVC : UIViewController
@property(nonatomic,strong) id<PassImageDelegate> delegate;
@property(nonatomic,strong) UIImage *image;
@property(nonatomic,assign) float ratioWidth;//宽
@property(nonatomic,assign) float ratioHeight;//高
@property(nonatomic,assign) float minWidth;//最小宽
@end
#import "CutImgageVC.h"
#define imgViewWigth 30
@interface CutImgageVC ()<UIGestureRecognizerDelegate>{
float imageX;
float imageY;
float imageW;
float imageH;
}
@property(nonatomic,strong) UIImageView *bgImgView;
@property(nonatomic,strong) UIView *cutView;
@property(nonatomic,strong) UIImageView *topLeftImgView;
@property(nonatomic,strong) UIImageView *topRigthImgView;
@property(nonatomic,strong) UIImageView *bottomLeftImgView;
@property(nonatomic,strong) UIImageView *bottomRigthImgView;
@end
@implementation CutImgageVC
- (void)viewDidLoad {
[super viewDidLoad];
//添加导航栏和完成按钮
UINavigationBar *naviBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0,ScreenWidth, 64)];
[self.view addSubview:naviBar];
UINavigationItem *naviItem = [[UINavigationItem alloc] initWithTitle:@"图片裁剪"];
[naviBar pushNavigationItem:naviItem animated:YES];
//保存按钮
UIBarButtonItem *doneItem = [[UIBarButtonItem alloc] initWithTitle:@"完成" style:UIBarButtonItemStylePlain target:self action:@selector(saveButton)];
naviItem.rightBarButtonItem = doneItem;
[self createImageView];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)saveButton{
[self clipWithRect];
[self dismissModalViewControllerAnimated:YES];
}
-(void)clipWithRect{
CGRect cropFrame = self.cutView.frame;
CGFloat orgX = (cropFrame.origin.x-imageX) * (self.image.size.width / imageW);
CGFloat orgY = (cropFrame.origin.y-imageY) * (self.image.size.height /imageH);
CGFloat width = cropFrame.size.width * (self.image.size.width / imageW);
CGFloat height = width*_ratioHeight/_ratioWidth;
CGRect cropRect = CGRectMake(orgX, orgY, width, height);
CGImageRef imgRef = CGImageCreateWithImageInRect(self.bgImgView.image.CGImage, cropRect);
CGFloat deviceScale = [UIScreen mainScreen].scale;
UIGraphicsBeginImageContextWithOptions(cropRect.size, 0, deviceScale);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(context, 0, cropRect.size.height);
CGContextScaleCTM(context, 1, -1);
CGContextDrawImage(context, CGRectMake(0, 0, cropRect.size.width, cropRect.size.height), imgRef);
UIImage *newImg = UIGraphicsGetImageFromCurrentImageContext();
CGImageRelease(imgRef);
UIGraphicsEndImageContext();
[self.delegate passImage:newImg];
}
-(void)createImageView{
[self.view addSubview:self.bgImgView];
[self.view addSubview:self.cutView];
[self.view addSubview:self.topLeftImgView];
[self.view addSubview:self.topRigthImgView];
[self.view addSubview:self.bottomLeftImgView];
[self.view addSubview:self.bottomRigthImgView];
//设置默认值
[self setDefaultInfo];
self.cutView.origin=self.topLeftImgView.center;
}
-(void)setDefaultInfo{
if (self.cutView.width<_minWidth) {
self.cutView.width=_minWidth;
self.cutView.height=self.cutView.width *_ratioHeight/_ratioWidth;
}
if (self.cutView.height<_minWidth *_ratioHeight/_ratioWidth) {
self.cutView.height=_minWidth*_ratioHeight/_ratioWidth;
self.cutView.width=_minWidth;
}
if (self.cutView.x<imageX) {
self.cutView.x=imageX;
}
if (self.cutView.y<imageY){
self.cutView.y=imageY;
}
if (self.cutView.x+self.cutView.width>imageW+imageX) {
self.cutView.x=imageW+imageX-self.cutView.width;
if (self.cutView.x<imageX) {
self.cutView.x=imageX;
}
if (self.cutView.width>imageW) {
self.cutView.width=imageW;
self.cutView.height=self.cutView.width *_ratioHeight/_ratioWidth;
}
}
if (self.cutView.y+self.cutView.height>imageH+imageY) {
self.cutView.y=imageH+imageY-self.cutView.height;
if (self.cutView.y<imageY){
self.cutView.y=imageY;
}
if (self.cutView.height>imageH) {
self.cutView.height=imageH;
self.cutView.width=self.cutView.height *_ratioWidth/_ratioHeight;
}
}
//更新4个imgView 的位置
self.topLeftImgView.origin=CGPointMake(self.cutView.origin.x-imgViewWigth/2, self.cutView.origin.y-imgViewWigth/2);
self.topRigthImgView.x=self.topLeftImgView.x+self.cutView.width;
self.topRigthImgView.y=self.topLeftImgView.y;
self.bottomLeftImgView.x=self.topLeftImgView.x;
self.bottomLeftImgView.y=self.topLeftImgView.y+self.cutView.height;
self.bottomRigthImgView.x= self.topRigthImgView.x;
self.bottomRigthImgView.y= self.bottomLeftImgView.y;
}
-(void)updateFrameWithImgView{
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
// 拿到UITouch就能获取当前点
UITouch *touch = [touches anyObject];
if (touch.view ==self.cutView) {
// 获取当前点
CGPoint curP = [touch locationInView:self.cutView];
// 获取上一个点
CGPoint preP = [touch previousLocationInView:self.cutView];
// 获取手指x轴偏移量
CGFloat offsetX = curP.x - preP.x;
// 获取手指y轴偏移量
CGFloat offsetY = curP.y - preP.y;
// 移动当前view
self.cutView.transform = CGAffineTransformTranslate(self.cutView.transform, offsetX, offsetY);
[self setDefaultInfo];
}
}
- (void)handleTDTap:(UIPanGestureRecognizer *)theTDTap{
if (theTDTap.state==UIGestureRecognizerStateChanged) {
UIImageView *imgView=(UIImageView *)[theTDTap view];
CGPoint point = [theTDTap locationInView:self.view];
CGPoint translation = [theTDTap translationInView:theTDTap.view];
CGFloat absX = fabs(translation.x);
CGFloat absY = fabs(translation.y);
// 设置滑动有效距离
if (MAX(absX, absY) < 10)
return;
//根据拖动点的Origin和比例更新当前框的大小
if (absX>absY) {
//横滑
NSLog(@"123");
[self slideWithHorizontally:imgView andPoint:point];
}else if (absX<absY){
//竖滑
NSLog(@"1234");
[self slideWithVerticaly:imgView andPoint:point];
}else{
NSLog(@"12345");
}
[self setDefaultInfo];
}
}
//横滑判断
-(void)slideWithHorizontally:(UIImageView *)imgView andPoint:(CGPoint)point{
if (imgView ==self.topLeftImgView) {
//如果为第一个点
imgView.origin=point;//更新当前imgView 的位置
//改变第二个点的Y
self.topRigthImgView.y= imgView.y;
//更新self.cutView frame
self.cutView.origin=self.topLeftImgView.center;
self.cutView.width=self.topRigthImgView.x-self.topLeftImgView.x;
self.cutView.height=self.cutView.width *_ratioHeight/_ratioWidth;
//改变第三个点的X
self.bottomLeftImgView.x=imgView.x;
self.bottomLeftImgView.y= imgView.y+self.cutView.height;
//第4个点的位置
// self.bottomRigthImgView.x= self.topRigthImgView.x;
self.bottomRigthImgView.y= self.bottomLeftImgView.y;
}else if (imgView ==self.topRigthImgView){
//如果为第二个点
imgView.origin=point;//更新当前imgView 的位置
//改变第一个点的Y
self.topLeftImgView.y=imgView.y;
//更新self.cutView frame
self.cutView.origin=self.topLeftImgView.center;
self.cutView.width=self.topRigthImgView.x-self.topLeftImgView.x;
self.cutView.height=self.cutView.width *_ratioHeight/_ratioWidth;
//第3个点的位置
// self.bottomLeftImgView.x=self.topLeftImgView.x;
self.bottomLeftImgView.y= imgView.y+self.cutView.height;
//第4个点的位置
self.bottomRigthImgView.x=imgView.x;
self.bottomRigthImgView.y= self.bottomLeftImgView.y;
}else if (imgView ==self.bottomLeftImgView){
//如果为第3个点
imgView.origin=point;//更新当前imgView 的位置
//更新self.cutView frame
//第4个点的位置
self.bottomRigthImgView.y= imgView.y;
self.cutView.width=self.bottomRigthImgView.x-self.bottomLeftImgView.x;
self.cutView.height=self.cutView.width *_ratioHeight/_ratioWidth;
//第1个点的位置
self.topLeftImgView.x=imgView.x;
self.topLeftImgView.y= imgView.y-self.cutView.height;;
//第2个点的位置
self.topRigthImgView.y= self.topLeftImgView.y;
self.cutView.origin=self.topLeftImgView.center;
}else if (imgView ==self.bottomRigthImgView){
//如果为第4个点
imgView.origin=point;//更新当前imgView 的位置
//第3个点的位置
self.bottomLeftImgView.y= imgView.y;
//更新self.cutView frame
self.cutView.width=self.bottomRigthImgView.x-self.bottomLeftImgView.x;
self.cutView.height=self.cutView.width *_ratioHeight/_ratioWidth;
//第1个点的位置
self.topLeftImgView.y= imgView.y-self.cutView.height;
//第2个点的位置
self.topRigthImgView.x=imgView.x;
self.topRigthImgView.y= self.topLeftImgView.y;
self.cutView.origin=self.topLeftImgView.center;
}else{
return;
}
// [self setDefaultInfo];
}
-(void)slideWithVerticaly:(UIImageView *)imgView andPoint:(CGPoint)point{
if (imgView ==self.topLeftImgView) {
//如果为第一个点
imgView.origin=point;//更新当前imgView 的位置
//更新self.cutView frame
self.cutView.origin=self.topLeftImgView.center;
self.cutView.height=self.bottomLeftImgView.y-self.topLeftImgView.y;
self.cutView.width=self.cutView.height *_ratioWidth/_ratioHeight;
//改变第3个点
self.bottomLeftImgView.x=imgView.x;
//改变第二个点的Y
self.topRigthImgView.x=imgView.x+self.cutView.width;
self.topRigthImgView.y= imgView.y;
//第4个点的位置
self.bottomRigthImgView.x= self.topRigthImgView.x;
self.bottomRigthImgView.y= self.bottomLeftImgView.y;
}else if (imgView ==self.topRigthImgView){
//如果为第二个点
imgView.origin=point;//更新当前imgView 的位置
//更新self.cutView frame
self.cutView.height=self.bottomLeftImgView.y-self.topLeftImgView.y;
self.cutView.width=self.cutView.height *_ratioWidth/_ratioHeight;
//改变第4个点的X
self.bottomRigthImgView.x=imgView.x;
//改变第1个点的X
self.topLeftImgView.x=imgView.x-self.cutView.width;
self.topLeftImgView.y=imgView.y;
self.cutView.origin=self.topLeftImgView.center;
//第3个点的位置
self.bottomLeftImgView.x=self.topLeftImgView.x;
self.bottomLeftImgView.y= self.bottomRigthImgView.y;
}else if (imgView ==self.bottomLeftImgView){
//如果为第3个点
imgView.origin=point;//更新当前imgView 的位置
//更新self.cutView frame
self.cutView.height=self.bottomLeftImgView.y-self.topLeftImgView.y;
self.cutView.width=self.cutView.height *_ratioWidth/_ratioHeight;
//第4个点的位置
self.bottomRigthImgView.x= imgView.x+self.cutView.width;
self.bottomRigthImgView.y=imgView.y;
//第1个点的位置
self.topLeftImgView.x=imgView.x;
//第2个点的位置
self.topRigthImgView.x=self.bottomRigthImgView.x;
self.topRigthImgView.y= self.topLeftImgView.y;
self.cutView.origin=self.topLeftImgView.center;
}else if (imgView ==self.bottomRigthImgView){
//如果为第4个点
imgView.origin=point;//更新当前imgView 的位置
//更新self.cutView frame
self.cutView.height=imgView.y-self.topLeftImgView.y;
self.cutView.width=self.cutView.height *_ratioWidth/_ratioHeight;
//第3个点的位置
self.bottomLeftImgView.x= imgView.x-self.cutView.width;
self.bottomLeftImgView.y= imgView.y;
//第1个点的位置
self.topLeftImgView.x= self.bottomLeftImgView.x;
//第2个点的位置
self.topRigthImgView.x=imgView.x;
self.topRigthImgView.y= self.topLeftImgView.y;
self.cutView.origin=self.topLeftImgView.center;
}else{
return;
}
}
-(UIImageView *)bgImgView{
if (!_bgImgView) {
_bgImgView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 64, ScreenWidth, ScreenHeight-64)];
_bgImgView.image=_image;
_bgImgView.contentMode=UIViewContentModeScaleAspectFit;
if (_bgImgView.image.size.width>=_bgImgView.image.size.height) {
imageW=ScreenWidth;
imageH=ScreenWidth *_bgImgView.image.size.height/_bgImgView.image.size.width;
}else{
imageH=ScreenHeight-64;
imageW=imageH *_bgImgView.image.size.width/_bgImgView.image.size.height;
}
//计算图片X,Y
imageX=(ScreenWidth-imageW)/2;
imageY=(ScreenHeight-64-imageH)/2 +64;
}
return _bgImgView;
}
-(UIView *)cutView{
if (!_cutView) {
_cutView=[[UIView alloc]initWithFrame:CGRectMake((ScreenWidth-_minWidth)/2, 0, _minWidth, _minWidth*_ratioHeight/_ratioWidth)];
_cutView.centerY= self.bgImgView.centerY;
_cutView.backgroundColor=[UIColor clearColor];
[Methods setBorder:_cutView andFloat:1.0 andColor:RGB(35, 198, 167)];
}
return _cutView;
}
-(UIImageView *)topLeftImgView{
if (!_topLeftImgView) {
_topLeftImgView=[[UIImageView alloc]initWithFrame:CGRectMake(55, 80, imgViewWigth, imgViewWigth)];
// _topLeftImgView.backgroundColor=RGB(35, 198, 167);
_topLeftImgView.image= [Methods ImageFromColor:RGB(35, 198, 167) andCGRect:CGRectMake(0, 0, 10, 10)];
_topLeftImgView.userInteractionEnabled=YES;
_topLeftImgView.contentMode=UIViewContentModeCenter;
UIPanGestureRecognizer *tap=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleTDTap:)];
tap.delegate = self;
tap.cancelsTouchesInView = NO;
tap.delaysTouchesEnded = NO;
[self.topLeftImgView addGestureRecognizer:tap];
}
return _topLeftImgView;
}
-(UIImageView *)topRigthImgView{
if (!_topRigthImgView) {
_topRigthImgView=[[UIImageView alloc]initWithFrame:CGRectMake(55, 100, imgViewWigth, imgViewWigth)];
// _topRigthImgView.backgroundColor=RGB(35, 198, 167);
_topRigthImgView.image= [Methods ImageFromColor:RGB(35, 198, 167) andCGRect:CGRectMake(0, 0, 10, 10)];
_topRigthImgView.contentMode=UIViewContentModeCenter;
_topRigthImgView.userInteractionEnabled=YES;
UIPanGestureRecognizer *tap=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleTDTap:)];
tap.delegate = self;
tap.cancelsTouchesInView = NO;
tap.delaysTouchesEnded = NO;
[self.topRigthImgView addGestureRecognizer:tap];
}
return _topRigthImgView;
}
-(UIImageView *)bottomLeftImgView{
if (!_bottomLeftImgView) {
_bottomLeftImgView=[[UIImageView alloc]initWithFrame:CGRectMake(55, 120, imgViewWigth, imgViewWigth)];
// _bottomLeftImgView.backgroundColor=RGB(35, 198, 167);
_bottomLeftImgView.image= [Methods ImageFromColor:RGB(35, 198, 167) andCGRect:CGRectMake(0, 0, 10, 10)];
_bottomLeftImgView.contentMode=UIViewContentModeCenter;
_bottomLeftImgView.userInteractionEnabled=YES;
UIPanGestureRecognizer *tap=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleTDTap:)];
tap.delegate = self;
tap.cancelsTouchesInView = NO;
tap.delaysTouchesEnded = NO;
[self.bottomLeftImgView addGestureRecognizer:tap];
}
return _bottomLeftImgView;
}
-(UIImageView *)bottomRigthImgView{
if (!_bottomRigthImgView) {
_bottomRigthImgView=[[UIImageView alloc]initWithFrame:CGRectMake(55, 140, imgViewWigth, imgViewWigth)];
// _bottomRigthImgView.backgroundColor=RGB(35, 198, 167);
_bottomRigthImgView.image= [Methods ImageFromColor:RGB(35, 198, 167) andCGRect:CGRectMake(0, 0, 10, 10)];
_bottomRigthImgView.contentMode=UIViewContentModeCenter;
_bottomRigthImgView.userInteractionEnabled=YES;
UIPanGestureRecognizer *tap=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleTDTap:)];
tap.delegate = self;
tap.cancelsTouchesInView = NO;
tap.delaysTouchesEnded = NO;
[self.bottomRigthImgView addGestureRecognizer:tap];
}
return _bottomRigthImgView;
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
// 禁用 iOS7 返回手势
if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}
}
-(void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
// self.navigationController.navigationBar.hidden=NO;
// 开启
if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
self.navigationController.interactivePopGestureRecognizer.enabled = YES;
}
}
@end
、、、
创建一个类，copy 你懂的，使用的时候需要添加PassImageDelegate这个代理方法，
然后在
、、、
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
//在这个代理方法里面我们做这样的处理
CutImgageVC *vc = [[CutImgageVC alloc] init];
vc.delegate = self;
vc.image = _picImage;//你获取到的图片
vc.ratioWidth = 1.0;
vc.ratioHeight = 1.0;
vc.minWidth = 80.0;
vc.view.backgroundColor = [UIColor whiteColor];
picker.navigationBar.hidden = YES;
[picker pushViewController:vc animated:YES];
}
//剪裁后回调的image
- (void)passImage:(UIImage *)image {
_headImage.image = image;
[self uploadimage];//这个是上传图片的方法，看你们怎么处理了
}
是不是很简单啊,end。。。。
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