ios开发图片点击放大

图片点击放大,再次点击返回原视图.完美封装,一个类一句代码即可调用.IOS完美实现

创建了一个专门用于放大图片的类,以下为.h文件

1. #import <Foundation/Foundation.h>
2. @interface SJAvatarBrowser : NSObject
3. /**
4. *  @brief  浏览头像
5. *
6. *  @param  oldImageView    头像所在的imageView
7. */
8. +(void)showImage:(UIImageView*)avatarImageView;
9. @end

以下为.m文件

1. #import "SJAvatarBrowser.h"
2. static CGRect oldframe;
3. @implementation SJAvatarBrowser
4. +(void)showImage:(UIImageView *)avatarImageView{
5. UIImage *image=avatarImageView.image;
6. UIWindow *window=[UIApplication sharedApplication].keyWindow;
7. UIView *backgroundView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
8. oldframe=[avatarImageView convertRect:avatarImageView.bounds toView:window];
9. backgroundView.backgroundColor=[UIColor blackColor];
10. backgroundView.alpha=0;
11. UIImageView *imageView=[[UIImageView alloc]initWithFrame:oldframe];
12. imageView.image=image;
13. imageView.tag=1;
14. [backgroundView addSubview:imageView];
15. [window addSubview:backgroundView];
16. UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(hideImage:)];
17. [backgroundView addGestureRecognizer: tap];
18. [UIView animateWithDuration:0.3 animations:^{
19. imageView.frame=CGRectMake(0,([UIScreen mainScreen].bounds.size.height-image.size.height*[UIScreen mainScreen].bounds.size.width/image.size.width)/2, [UIScreen mainScreen].bounds.size.width, image.size.height*[UIScreen mainScreen].bounds.size.width/image.size.width);
20. backgroundView.alpha=1;
21. } completion:^(BOOL finished) {
22. }];
23. }
24. +(void)hideImage:(UITapGestureRecognizer*)tap{
25. UIView *backgroundView=tap.view;
26. UIImageView *imageView=(UIImageView*)[tap.view viewWithTag:1];
27. [UIView animateWithDuration:0.3 animations:^{
28. imageView.frame=oldframe;
29. backgroundView.alpha=0;
30. } completion:^(BOOL finished) {
31. [backgroundView removeFromSuperview];
32. }];
33. }
34. @end

引入此类之后,为自己需要放大的imageView添加tap手势

1. UITapGestureRecognizer *tap  = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(magnifyImage)];
2. [self.imageView addGestureRecognizer:tap];

1. - (void)magnifyImage
2. {
3. NSLog(@"局部放大");
4. [SJAvatarBrowser showImage:self.imageView];//调用方法
5. }

转载请声明源地址http://blog.csdn.net/u013082522/article/details/18445901