好久没有更新，年龄越大人越懒罢，不废话，上代码
.h文件
//// ZJImageMagnification.h//// Created by apple on 2017/5/8.// Copyright © 2017年 apple. All rights reserved.//#import@interface ImageMagnification : NSObject/**
* 浏览大图
*
* @param currentImageview 当前图片
* @param alpha 背景透明度
*/
+(void)scanBigImageWithImageView:(UIImageView *)currentImageview alpha:(CGFloat)alpha;
@end
.m文件
//// ZJImageMagnification.m//// Created by apple on 2017/5/8.// Copyright © 2017年 apple. All rights reserved./*图片放大*/#import "ImageMagnification.h"@implementation ImageMagnification//原始尺寸static CGRect oldframe;static CGRect newbounds;UIImageView *Imageview;float scale;/** * 浏览大图 * * @param currentImageview 当前图片 * @param alpha 背景透明度 */+(void)scanBigImageWithImageView:(UIImageView *)currentImageview alpha:(CGFloat)alpha { // 当前imageview的图片 UIImage *image = currentImageview.image; Imageview = currentImageview; Imageview.hidden=YES;; // 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 colorWithRed:0/255.0 green:0/255.0 blue:0/255.0 alpha:alpha]]; // 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:oldframe]; [imageView setImage:image]; imageView.contentMode =UIViewContentModeScaleAspectFit; [imageView setTag:1024]; [backgroundView addSubview:imageView]; // 将原始视图添加到背景视图中 [window addSubview:backgroundView]; // 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:)]; [backgroundView addGestureRecognizer:tapGestureRecognizer]; // 添加拖动手势 UIPanGestureRecognizer*PanGestureRecognizer = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panImageView:)]; [backgroundView addGestureRecognizer:PanGestureRecognizer]; //缩放手势 UIPinchGestureRecognizer*PinchGestureRecognizer = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchImageView:)]; [backgroundView addGestureRecognizer:PinchGestureRecognizer]; scale=1; // 动画放大所展示的ImageView [UIView animateWithDuration:0.4 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, y, width, height)]; newbounds=imageView.bounds; //重要！ 将视图显示出来 [backgroundView setAlpha:1]; } completion:^(BOOL finished) { }]; }/** * 缩放imageView * * @param pinch 缩放事件 */+ (void)pinchImageView:(UIPinchGestureRecognizer *)pinch{ UIView *backgroundView = pinch.view; // 原始imageview UIImageView *imageView = [backgroundView viewWithTag:1024]; if (pinch.state==UIGestureRecognizerStateEnded) { if (imageView.bounds.size.width!=newbounds.size.width) { [UIView animateWithDuration:.4 animations:^{ imageView.center=CGPointMake(SCREEN_WIDTH/2, SCREENH_HEIGHT/2); imageView.bounds=newbounds; }]; } return; } if (pinch.state == UIGestureRecognizerStateBegan || pinch.state == UIGestureRecognizerStateChanged) { if (imageView.bounds.size.width*pinch.scale将背景视图删掉
Imageview.hidden=NO;
[UIView transitionWithView:Imageview duration:.5 options:UIViewAnimationOptionTransitionCrossDissolve animations:nil completion:nil];
[backgroundView removeFromSuperview];
}];
}
return;
}
//返回在横坐标上、纵坐标上拖动了多少像素
CGPoint point=[pan translationInView:backgroundView];
[UIView animateWithDuration:.1 animations:^{
imageView.center=CGPointMake(imageView.center.x+point.x, imageView.center.y+point.y);
if (imageView.center.y>SCREENH_HEIGHT/2) {
float alpha=(SCREENH_HEIGHT-imageView.center.y)/SCREENH_HEIGHT*2;
[backgroundView setAlpha:alpha];
imageView.bounds=CGRectMake(0, 0, oldframe.size.width+(newbounds.size.width-oldframe.size.width)*alpha, oldframe.size.height+(newbounds.size.height-oldframe.size.height)*alpha);
}else{
backgroundView.alpha=1;
imageView.bounds=newbounds;
}
}];
//拖动完之后，每次都要用setTranslation:方法制0这样才不至于不受控制般滑动出视图
[pan setTranslation:CGPointMake(0, 0) inView:backgroundView];
}
/**
* 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:1024];
// 恢复
[UIView animateWithDuration:0.4 animations:^{
[imageView setFrame:oldframe];
[backgroundView setAlpha:0];
} completion:^(BOOL finished) {
//完成后操作->将背景视图删掉
Imageview.hidden=NO;
[UIView transitionWithView:Imageview duration:.5 options:UIViewAnimationOptionTransitionCrossDissolve animations:nil completion:nil];
[backgroundView removeFromSuperview];
}];
}
@end
从入门到想放弃iOS，话说做这一行已经4年，从当初的实在没办法找工作学oc到现在一天不碰代码就失眠，从没有系统的学过iOS，感觉好可惜，自己一点点摸索虽然成长的蛮快，但是真的很艰苦，希望能够在简书找到志同道合的朋友，让我们一起越走越远。
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