两个类
QDHimageView.h
#import <UIKit/UIKit.h>
@interface QDHimageView : UIImageView
@property(nonatomic,assign) BOOL ifCheckBigImage;
- (instancetype)initWithFrame:(CGRect)frame imageName:(NSString*)imageName contentMode:(UIViewContentMode)contentMode ifCheckBigImage:(BOOL)ifCheckBigImage;
@end
QDHimageView.m
#import "QDHimageView.h"
#import "QDHScanImage.h"
@implementation QDHimageView
- (instancetype)initWithFrame:(CGRect)frame imageName:(NSString*)imageName contentMode:(UIViewContentMode)contentMode ifCheckBigImage:(BOOL)ifCheckBigImage {
self = [super init];
if (self) {
self.frame = frame;
self.image = [UIImage imageNamed:imageName];
self.contentMode = contentMode;
self.userInteractionEnabled = ifCheckBigImage;
}
return self;
}
- (void)layoutSubviews {
[super layoutSubviews];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(scanBigImgClick:)];
[self addGestureRecognizer:tap];
}
- (void) scanBigImgClick:(UITapGestureRecognizer *)tap {
UIImageView *clickedImageView = (UIImageView *)tap.view;
[QDHScanImage scanBigImageWithImageView:clickedImageView];
}
@end
QDHScanImage.h
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface QDHScanImage : NSObject
+(void)scanBigImageWithImageView:(UIImageView *)currentImageview;
@end
QDHScanImage.m
#import "QDHScanImage.h"
@implementation QDHScanImage
//原始尺寸
static CGRect oldframe; //图片原有尺寸
static CGRect bigImgFrame; //图片最大程度
/**
* 浏览大图
*
* @param currentImageview 图片所在的imageView
*/
+(void)scanBigImageWithImageView:(UIImageView *)currentImageview{
//当前imageview的图片
UIImage *image = currentImageview.image;
//当前视图
UIWindow *window = [UIApplication sharedApplication].keyWindow;
//背景
UIView *backgroundView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
//当前imageview的原始尺寸->将像素currentImageview.bounds由currentImageview.bounds所在视图转换到目标视图window中，返回在目标视图window中的像素值
oldframe = [currentImageview convertRect:currentImageview.bounds toView:window];
[backgroundView setBackgroundColor:[UIColor blackColor]];//colorWithRed:107/255.0 green:107/255.0 blue:99/255.0 alpha:0.6
//此时视图不会显示
[backgroundView setAlpha:0];
//将所展示的imageView重新绘制在Window中
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
[imageView setImage:image];
[imageView setTag:0];
imageView.backgroundColor = [UIColor blackColor];
//[backgroundView addSubview:imageView];
imageView.contentMode = UIViewContentModeScaleAspectFit;
[imageView setUserInteractionEnabled:YES];
[imageView setMultipleTouchEnabled:YES];
//将原始视图添加到背景视图中
[backgroundView addSubview:imageView];
[window addSubview:backgroundView];
//动画放大所展示的ImageView
[UIView animateWithDuration:0.15 animations:^{
CGFloat y,width,height;
y = ([UIScreen mainScreen].bounds.size.height - image.size.height * [UIScreen mainScreen].bounds.size.width / image.size.width) * 0.5;
//宽度为屏幕宽度
width = [UIScreen mainScreen].bounds.size.width;
//高度 根据图片宽高比设置
height = image.size.height * [UIScreen mainScreen].bounds.size.width / image.size.width;
[imageView setFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
//重要！ 将视图显示出来
[backgroundView setAlpha:1];
NSLog(@"y ===== %lf\nwidth ====== %lf\nheight ====== %lf",y,width,height);
} completion:^(BOOL finished) {
}];
#pragma - mark 添加手势
//添加点击事件同样是类方法 -> 作用是再次点击回到初始大小
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideImageView:)];
tapGestureRecognizer.numberOfTapsRequired = 1;
[backgroundView addGestureRecognizer:tapGestureRecognizer];
//添加捏合事件
UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchGestureRecognizer:)];
[imageView addGestureRecognizer:pinchGestureRecognizer];
// 移动手势
UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)];
[imageView addGestureRecognizer:panGestureRecognizer];
}
+ (void)downloadImgClick: (UIButton *)btn {
NSLog(@"点击了下载按钮");
}
/** 捏合手势 */
+(void)pinchGestureRecognizer:(UIPinchGestureRecognizer *)pin{
//NSLog(@"捏合数据:%@",pin);
UIView *imageView = pin.view;
if (pin.state == UIGestureRecognizerStateBegan || pin.state == UIGestureRecognizerStateChanged) {
//图片缩放
imageView.transform = CGAffineTransformScale(imageView.transform, pin.scale, pin.scale);
CGFloat y,width,height;
y = ([UIScreen mainScreen].bounds.size.height - imageView.frame.size.height * [UIScreen mainScreen].bounds.size.width / imageView.frame.size.width) * 0.5;
//宽度为屏幕宽度
width = [UIScreen mainScreen].bounds.size.width;
//高度 根据图片宽高比设置
height = imageView.frame.size.height * [UIScreen mainScreen].bounds.size.width / imageView.frame.size.width;
bigImgFrame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height);
if (imageView.frame.size.width < bigImgFrame.size.width) {
[imageView setFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
//让图片无法缩得比原图小
}
if (imageView.frame.size.width > 3 * bigImgFrame.size.width) {
NSLog(@"大于三倍了");
imageView.frame = CGRectMake(0, 0, 3 * bigImgFrame.size.width, 3 * bigImgFrame.size.height);
CGPoint point = CGPointMake([UIScreen mainScreen].bounds.size.width * 0.5, [UIScreen mainScreen].bounds.size.height * 0.5);
imageView.center = point;
if (imageView.frame.origin.x < -2 * bigImgFrame.size.width) { //左
imageView.frame = CGRectMake(-2 * bigImgFrame.size.width, imageView.frame.origin.y, imageView.frame.size.width, imageView.frame.size.height);
}
if (imageView.frame.origin.y < -2 * bigImgFrame.size.height){ //上
imageView.frame = CGRectMake(imageView.frame.origin.x,-2 * bigImgFrame.size.height, imageView.frame.size.width, imageView.frame.size.height);
}
if (imageView.frame.origin.x + 2 * bigImgFrame.size.width > 2 * [UIScreen mainScreen].bounds.size.width){ //右
imageView.frame = CGRectMake(0, imageView.frame.origin.y, imageView.frame.size.width, imageView.frame.size.height);
}
if (imageView.frame.origin.y + 2 * bigImgFrame.size.height > 2 * [UIScreen mainScreen].bounds.size.height){ //下
imageView.frame = CGRectMake(imageView.frame.origin.x,0, imageView.frame.size.width, imageView.frame.size.height);
}
}
/**
捏合手势的上下左右约束
*/
if (imageView.frame.origin.x > 0) { //左
imageView.frame = CGRectMake(0, imageView.frame.origin.y, imageView.frame.size.width, imageView.frame.size.height);
}
if (imageView.frame.origin.y > 0){ //上
imageView.frame = CGRectMake(imageView.frame.origin.x,0, imageView.frame.size.width, imageView.frame.size.height);
}
if (imageView.frame.origin.x + imageView.frame.size.width < [UIScreen mainScreen].bounds.size.width){ //右
imageView.frame = CGRectMake([UIScreen mainScreen].bounds.size.width - imageView.frame.size.width, imageView.frame.origin.y, imageView.frame.size.width, imageView.frame.size.height);
}
if (imageView.frame.origin.y + imageView.frame.size.height < [UIScreen mainScreen].bounds.size.height){ //下
imageView.frame = CGRectMake(imageView.frame.origin.x,[UIScreen mainScreen].bounds.size.height - imageView.frame.size.height, imageView.frame.size.width, imageView.frame.size.height);
}
pin.scale = 1;
}
}
/**
* 恢复imageView原始尺寸
*
* @param tap 点击事件
*/
+(void)hideImageView:(UITapGestureRecognizer *)tap{
UIView *backgroundView = tap.view;
//原始imageview
UIImageView *imageView = [tap.view viewWithTag:0];
//恢复
[UIView animateWithDuration:0.1 animations:^{
[imageView setFrame:oldframe];
[backgroundView setAlpha:0];
} completion:^(BOOL finished) {
//完成后操作->将背景视图删掉
[backgroundView removeFromSuperview];
}];
}
//拖拽手势
+(void) panView:(UIPanGestureRecognizer *)pan {
UIView *view = pan.view;
//判断拖拽到边界的判断
if (view.frame.size.width == [UIScreen mainScreen].bounds.size.width) {
}
if (view.frame.origin.x > 0){ //左
view.frame = CGRectMake(0,view.frame.origin.y, view.frame.size.width, view.frame.size.height);
}
if (view.frame.origin.y > 0){ //上
view.frame = CGRectMake(view.frame.origin.x,0, view.frame.size.width, view.frame.size.height);
}
if (view.frame.origin.x + view.frame.size.width < [UIScreen mainScreen].bounds.size.width){ //右
view.frame = CGRectMake([UIScreen mainScreen].bounds.size.width - view.frame.size.width, view.frame.origin.y, view.frame.size.width, view.frame.size.height);
}
if (view.frame.origin.y + view.frame.size.height < [UIScreen mainScreen].bounds.size.height){ //下
view.frame = CGRectMake(view.frame.origin.x,[UIScreen mainScreen].bounds.size.height - view.frame.size.height, view.frame.size.width, view.frame.size.height);
}
if (pan.state == UIGestureRecognizerStateBegan || pan.state == UIGestureRecognizerStateChanged) {
CGPoint translation = [pan translationInView:view.superview];
[view setCenter:(CGPoint){view.center.x + translation.x, view.center.y + translation.y}];
[pan setTranslation:CGPointZero inView:view.superview];
}
}
@end
使用时建立一个目录
image.png
在图片位置使用QDHimageView即可
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