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
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#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
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imagecopperview.m
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#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
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对uiimage添加了一个category
uiimage+rotation.h
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#import <uikit/uikit.h>
@interface uiimage (rotation)
- (uiimage *)imagerotatedbyradians:(cgfloat)radians;
- (uiimage *)imagerotatedbydegrees:(cgfloat)degrees;
@end
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uiimage+rotation.m
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#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;
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viewcontroller.m
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#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
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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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原文链接：http://www.cnblogs.com/xiaobaizhu/archive/2013/07/03/3170101.html