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小编给大家分享一下IOS中如何实现照片编辑的view封装，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
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;
@endImageCopperView.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
看完了这篇文章，相信你对“IOS中如何实现照片编辑的view封装”有了一定的了解，如果想了解更多相关知识，欢迎关注亿速云行业资讯频道，感谢各位的阅读！
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