【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