Question

ios image的放大有哪些方法

Answer 1

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

#import

<foundation foundation.h="">

@interface

SJAvatarBrowser : NSObject
/**
*
@brief 浏览头像
*
*
@param oldImageView 头像所在的imageView
*/
+(void)showImage:(UIImageView*)avatarImageView;

@end</foundation>

以下为.m文件

#import

"SJAvatarBrowser.h"
static

CGRect oldframe;
@implementation

SJAvatarBrowser
+(void)showImage:(UIImageView
*)avatarImageView{
UIImage
*image=avatarImageView.image;
UIWindow
*window=[UIApplication sharedApplication].keyWindow;
UIView
*backgroundView=[[UIView alloc]initWithFrame:CGRectMake(0,
0,
[UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
oldframe=[avatarImageView
convertRect:avatarImageView.bounds toView:window];
backgroundView.backgroundColor=[UIColor
blackColor];
backgroundView.alpha=0;
UIImageView
*imageView=[[UIImageView alloc]initWithFrame:oldframe];
imageView.image=image;
imageView.tag=1;
[backgroundView
addSubview:imageView];
[window
addSubview:backgroundView];

UITapGestureRecognizer
*tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(hideImage:)];
[backgroundView
addGestureRecognizer: tap];

[UIView
animateWithDuration:0.3

animations:^{
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);
backgroundView.alpha=1;
}
completion:^(BOOL finished) {

}];
}

+(void)hideImage:(UITapGestureRecognizer*)tap{
UIView
*backgroundView=tap.view;
UIImageView
*imageView=(UIImageView*)[tap.view viewWithTag:1];
[UIView
animateWithDuration:0.3

animations:^{
imageView.frame=oldframe;
backgroundView.alpha=0;
}
completion:^(BOOL finished) {
[backgroundView
removeFromSuperview];
}];
}
@end

引入此类之后,为自己需要放大的imageView添加tap手势

UITapGestureRecognizer
*tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(magnifyImage)];

[self.imageView
addGestureRecognizer:tap];

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