6. 使用动画放大展示ImageView
//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)];
//重要！ 将视图显示出来
[backgroundView setAlpha:1];
} completion:^(BOOL finished) {
}];
7. 添加恢复ImageView原始尺寸的tap点击事件
//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];
/**
* 恢复imageView原始尺寸
*/
+(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) {
[backgroundView removeFromSuperview];
}];
}
8. 完成之后将背景视图删掉
//完成后操作->将背景视图删掉
[backgroundView removeFromSuperview];
四：项目实际使用
1. 引入封装类FBYImageZoom
#import "FBYImageZoom.h"
2. 给UIImageView添加手势
//添加点击事件
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(scanBigImageClick:)];
3. 调用封装类函数
//浏览大图点击事件
-(void)scanBigImageClick:(UITapGestureRecognizer *)tap{
NSLog(@"点击图片");
UIImageView *clickedImageView = (UIImageView *)tap.view;
[FBYImageZoom ImageZoomWithImageView:clickedImageView];
}
好了，到这里点击图片放大到全屏就完成了
4. 长按保存图片
另外就是实现长按保存图片的功能，这个功能很简单
首先增加长按手势
//创建长按手势
UILongPressGestureRecognizer *longTap = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(imglongTapClick:)];
//添加手势
[_myImageView addGestureRecognizer:longTap];
然后长按手势弹出警告视图确认
-(void)imglongTapClick:(UILongPressGestureRecognizer*)gesture
{
if(gesture.state==UIGestureRecognizerStateBegan)
{
UIAlertController *alertControl = [UIAlertController alertControllerWithTitle:@"保存图片" message:nil preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"取消保存图片");
}];
UIAlertAction *confirm = [UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"确认保存图片");
// 保存图片到相册
UIImageWriteToSavedPhotosAlbum(self.myImageView.image,self,@selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:),nil);
}];
[alertControl addAction:cancel];
[alertControl addAction:confirm];
[self presentViewController:alertControl animated:YES completion:nil];
}
}
