【IOS】扩展UIImageViewEx实现：手势移动,旋转,缩放（附带一个收缩的文字标签功能）

#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>

typedef enum{
UIImageExNormal = 0,
UIImageExFull
}UIImageExState;

@interface UIImageViewEx : UIImageView<UIGestureRecognizerDelegate>
{
UIView *parentview;         //父窗口，即用将UIImageEx所加到的UIView

BOOL isPanEnable;           //是否可以移动
BOOL isPinchEnable;         //是否可以放大缩小
BOOL isRotateEnable;        //是否可以旋转
BOOL isTap;                 //是否可以点击触摸

UIImageExState imageState;  //图片当前状态

CGFloat imageScale;        //最大缩放的倍数
CGFloat imageSize;         //记录图片的累计缩放
CGFloat imageRotation;     //记录图片的原始角度
CGPoint imagePoint;        //记录图片的原始位置

UITextView *textView;      //动态弹出的文本

}

@property (nonatomic,retain) UIView *parentview;
@property (nonatomic) CGFloat imageSize;
@property (nonatomic) CGFloat imageRotation;
@property (nonatomic) CGPoint imagePoint;

@property  BOOL isPanEnable;
@property  BOOL isRotateEnable;
@property  BOOL isPinchEnable;
@property  BOOL isTap;

- (void)handlePan:(UIPanGestureRecognizer *)recognizer;
- (void)handlePinch:(UIPinchGestureRecognizer *)recognizer;
- (void)handleRotate:(UIRotationGestureRecognizer *)recognizer;
- (void)handleTap:(UITapGestureRecognizer *)recognizer;

//必须设置的
- (void)setScaleAndRotation:(UIView*)imageView;
- (void)setInfoText:(NSString *)string;
- (void)setShadow:(BOOL)isShadow;
@end

#import "UIImageViewEx.h"

@implementation UIImageViewEx
@synthesize parentview;
@synthesize isRotateEnable,isPanEnable,isPinchEnable,isTap;
@synthesize imageSize,imageRotation,imagePoint;

/*
* SetScaleAndRotation 实现 ImageView的 手势旋转，缩放，和移动
* @parent UIView 父窗口
*/
- (void)setScaleAndRotation:(UIView*) parent
{
parentview=parent;
parentview.userInteractionEnabled=YES;

isPanEnable=YES;
isPinchEnable=YES;
isRotateEnable=YES;
isTap = YES;

imageSize=1;
imageRotation=0;

imageScale= self.parentview.frame.size.width/self.frame.size.width;
imagePoint=self.frame.origin;
self.userInteractionEnabled=YES;

UIPanGestureRecognizer *panRcognize=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
panRcognize.delegate=self;
[panRcognize setEnabled:YES];
[panRcognize delaysTouchesEnded];
[panRcognize cancelsTouchesInView];

UIPinchGestureRecognizer *pinchRcognize=[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)];
[pinchRcognize setEnabled:YES];
[pinchRcognize delaysTouchesEnded];
[pinchRcognize cancelsTouchesInView];

UIRotationGestureRecognizer *rotationRecognize=[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(handleRotate:)];
[rotationRecognize setEnabled:YES];
[rotationRecognize delaysTouchesEnded];
[rotationRecognize cancelsTouchesInView];
rotationRecognize.delegate=self;
pinchRcognize.delegate=self;

UITapGestureRecognizer *tapRecognize = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTap:)];
tapRecognize.numberOfTapsRequired = 1;
tapRecognize.delegate = self;
[tapRecognize setEnabled :YES];
[tapRecognize delaysTouchesBegan];
[tapRecognize cancelsTouchesInView];

[self addGestureRecognizer:rotationRecognize];
[self addGestureRecognizer:panRcognize];
[self addGestureRecognizer:pinchRcognize];
[self addGestureRecognizer:tapRecognize];

}
/*
* setInfoText 设置介绍文字
* @string NSString 显示的文字
*/
- (void)setInfoText:(NSString *)string
{
if (textView!=nil) {
[textView removeFromSuperview];
textView = nil;
}

textView = [[UITextView alloc]initWithFrame:CGRectMake(0, 0, 0, 30)];
textView.text = string;
textView.hidden = YES;
textView.backgroundColor = [UIColor blueColor];
textView.textColor =[UIColor whiteColor];
[self addSubview:textView];
}
/*
*  SetShadow 设置是否开启阴影效果
*  @isShadow BOOL  YES 开启，NO 关闭
*/
- (void)setShadow:(BOOL)isShadow
{
if (!isShadow) {
[[self layer] setShadowOffset:CGSizeMake(0, 0)];
[[self layer] setShadowRadius:0];
[[self layer] setShadowOpacity:1];
[[self layer] setShadowColor:[UIColor whiteColor].CGColor];
return;
}
[[self layer] setShadowOffset:CGSizeMake(3, 3)];
[[self layer] setShadowRadius:3];
[[self layer] setShadowOpacity:0.5];
[[self layer] setShadowColor:[UIColor blackColor].CGColor];
}

#pragma UIGestureRecognizer Handles
/*
*  移动图片处理的函数
*  @recognizer 移动手势
*/
- (void)handlePan:(UIPanGestureRecognizer *)recognizer {

if (!isPanEnable) {
return;
}
[self setShadow:YES];
CGPoint translation = [recognizer translationInView:parentview];
recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,
recognizer.view.center.y + translation.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:parentview];

if (recognizer.state == UIGestureRecognizerStateEnded) {
[UIView animateWithDuration:0.75 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
recognizer.view.center=CGPointMake(imagePoint.x+self.frame.size.width/2, imagePoint.y+self.frame.size.height/2);
} completion:nil];

[self setShadow:NO];

}

}
/*
* handPinch 缩放的函数
* @recognizer UIPinchGestureRecognizer 手势识别器
*/
- (void)handlePinch:(UIPinchGestureRecognizer *)recognizer{
if (!isPinchEnable) {
return;
}
imageSize*=recognizer.scale;
recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
if (recognizer.state==UIGestureRecognizerStateEnded) {

[UIView animateWithDuration:.35 animations:^{
if (imageSize >=1 && imageState == UIImageExNormal) {
recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform,imageScale/imageSize, imageScale/imageSize);
imageState = UIImageExFull;
}
else if(imageSize<1 && imageState == UIImageExFull)
{
recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, 1/(imageScale*imageSize), 1/(imageScale*imageSize));
imageState = UIImageExNormal;
}else {
recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, 1/imageSize,1/imageSize);
}

[UIView animateWithDuration:0.35 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
recognizer.view.center=CGPointMake(imagePoint.x+self.frame.size.width/2, imagePoint.y+self.frame.size.height/2);
} completion:nil];
recognizer.scale = 1;
imageSize = 1;
}];

}
recognizer.scale = 1;

}

/*
* handleRotate 旋转的函数
* recognizer UIRotationGestureRecognizer 手势识别器
*/
- (void)handleRotate:(UIRotationGestureRecognizer *)recognizer{
if (!isRotateEnable) {
return;
}
imageRotation+=recognizer.rotation;
recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
if (recognizer.state==UIGestureRecognizerStateEnded) {
[UIView animateWithDuration:.35 animations:^{
recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, -imageRotation);
recognizer.view.center=CGPointMake(imagePoint.x+self.frame.size.width/2, imagePoint.y+self.frame.size.height/2);
}];

imageRotation=0;
}
recognizer.rotation = 0;
}

/*
*  handleTap 触摸函数
*  @recognizer  UITapGestureRecognizer 触摸识别器
*/
-(void) handleTap:(UITapGestureRecognizer *)recognizer
{
if (!isTap) {
return;
}
if (textView.hidden) {
[UIView animateWithDuration:0.35 delay:0.15 options:UIViewAnimationOptionTransitionCurlUp animations:^{
textView.hidden = NO;
textView.frame = CGRectMake(0, 0, 120, 30);
} completion:nil];
}else {
[UIView animateWithDuration:0.35 delay:0.15 options:UIViewAnimationOptionTransitionCurlUp animations:^{

textView.frame = CGRectMake(0, 0, 0, 30);
} completion:^(BOOL finished){
if (finished){
textView.hidden = YES;
}
}];
}

}

#pragma UIGestureRecognizerDelegate
/*
*  gestureRecognizer 实现了委托，从而实现可以同时接受多个手势
*  @return  YES 则可以接受多个手势，NO 则同时只能接受一个手势
*/
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}

@end