1.单击退出
2.双击放大/缩小
3.手势缩放
4.按imageView原来frame动画打开/退出
1.源码
ImageBrowserController.h
#import <UIKit/UIKit.h>
typedef void (^ImageBrowserCompletion)();
@interface ImageBrowserController : UIViewController
-(instancetype)initWithPlaceImageView: (UIImageView*)imageView;
// 占位图
-(instancetype)initWithPlaceImageView: (UIImageView*)imageView
showCompletion: (ImageBrowserCompletion)show
dismissCompletion: (ImageBrowserCompletion)dismiss;
// 显示
-(void)showWithAnimation;
@end
ImageBrowserController.m
#import "ImageBrowserController.h"
@interface ImageBrowserController ()<UIScrollViewDelegate>
@property(nonatomic,copy)UIScrollView *scrollView;
@property(nonatomic,copy)UIImageView *imageView;
@property(nonatomic)CGRect fromFrame;
@property(nonatomic)CGRect toFrame;
@end
@implementation ImageBrowserController
{
UIImageView *_placeImageView;
UIImage *_image;
ImageBrowserCompletion _showCompletion;
ImageBrowserCompletion _dismissCompletion;
}
-(instancetype)initWithPlaceImageView:(UIImageView *)imageView
showCompletion:(ImageBrowserCompletion)show
dismissCompletion:(ImageBrowserCompletion)dismiss{
self = [[ImageBrowserController alloc] initWithPlaceImageView:imageView];
_showCompletion = show;
_dismissCompletion = dismiss;
return self;
}
-(instancetype)initWithPlaceImageView:(UIImageView *)imageView{
if (self = [super init]) {
_placeImageView = imageView;
_image = imageView.image;
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.view addSubview:self.scrollView];
}
-(void)showWithAnimation{
_placeImageView.image = nil;
_imageView.hidden = false;
_imageView.frame = self.fromFrame;
[UIView animateWithDuration:0.5 animations:^{
_imageView.frame = self.toFrame;
self.view.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.8];
} completion:^(BOOL finished) {
_showCompletion ? _showCompletion() : nil;
}];
}
-(void)closeWithAnimation{
_scrollView.contentOffset = CGPointZero;
_imageView.center = self.view.center;
[UIView animateWithDuration:0.5 animations:^{
_imageView.frame = self.fromFrame;
self.view.backgroundColor = [UIColor clearColor];
} completion:^(BOOL finished) {
_placeImageView.image = _image;
[self dismissViewControllerAnimated:false completion:^{
_dismissCompletion ? _dismissCompletion() : nil;
}];
}];
}
#pragma mark - getters & setters
-(UIScrollView *)scrollView{
if (!_scrollView) {
UIScrollView *sc = [[UIScrollView alloc] initWithFrame:self.view.bounds];
sc.minimumZoomScale = 0.5;
sc.maximumZoomScale = 3.0;
sc.delegate = self;
sc.showsVerticalScrollIndicator = false;
sc.showsHorizontalScrollIndicator = false;
[sc addSubview:self.imageView];
_scrollView = sc;
}
return _scrollView;
}
-(UIImageView *)imageView{
if (!_imageView) {
UIImageView *iv = [[UIImageView alloc] initWithImage:_placeImageView.image];
iv.hidden = true;
iv.userInteractionEnabled = true;
UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap:)];
tap.numberOfTapsRequired=1;//单击
tap.numberOfTouchesRequired=1;//单点触碰
[iv addGestureRecognizer:tap];
UITapGestureRecognizer *doubleTap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(doubleTap:)];
doubleTap.numberOfTapsRequired=2;
[tap requireGestureRecognizerToFail:doubleTap];//避免单击与双击冲突
[iv addGestureRecognizer:doubleTap];
_imageView = iv;
}
return _imageView;
}
-(CGRect)fromFrame{
if (_fromFrame.size.width == 0) {
// 坐标转换
CGPoint org = [self.view convertPoint:_placeImageView.frame.origin fromView:_placeImageView.superview];
_fromFrame = CGRectMake(org.x, org.y, _placeImageView.frame.size.width, _placeImageView.frame.size.height);
}
return _fromFrame;
}
-(CGRect)toFrame{
if (_toFrame.size.width == 0)
{
CGFloat ratio = _image.size.height / _image.size.width;
CGFloat h = ratio * [self screenW];
_toFrame = CGRectMake(0, 0, [self screenW], h);
// 居中显示
if (h > [self screenH]) {
_scrollView.contentSize = _imageView.bounds.size;
}
else{
CGFloat y = ([self screenH] - h) * 0.5;
_scrollView.contentInset = UIEdgeInsetsMake(y, 0, 0, y);
}
}
return _toFrame;
}
-(CGFloat)screenW{
return CGRectGetWidth([UIScreen mainScreen].bounds);
}
-(CGFloat)screenH{
return CGRectGetHeight([UIScreen mainScreen].bounds); // 状态栏
}
#pragma mark - UIScrollViewDelegate
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
return self.imageView;
}
-(void)scrollViewDidZoom:(UIScrollView *)scrollView{
// 注意: scrollview缩放内部的实现原理其实是利用transform实现的,
// 如果是利用transform缩放控件, 那么bounds不会改变, 只有frame会改变
// 重新调整图片的位置
CGFloat offsetY = ([self screenH] - _imageView.frame.size.height) * 0.5;
// 注意: 如果offsetY是负数, 会导致高度显示不完整
offsetY = offsetY < 0 ? 0 : offsetY;
CGFloat offsetX = ([self screenW] - _imageView.frame.size.width) * 0.5;
// 注意: 如果offsetX负数, 会导致高度显示不完整
offsetX = offsetX < 0 ? 0 : offsetX;
scrollView.contentInset = UIEdgeInsetsMake(offsetY, offsetX, offsetY, offsetX);
}
-(void)tap: (UITapGestureRecognizer*)gesture{
[self closeWithAnimation];
}
-(void)doubleTap: (UITapGestureRecognizer*)tap{
if (_scrollView.zoomScale < _scrollView.maximumZoomScale) {
[UIView animateWithDuration:0.5 animations:^{
_scrollView.zoomScale = _scrollView.maximumZoomScale;
}];
}
else{
[UIView animateWithDuration:0.5 animations:^{
_scrollView.zoomScale = 1.0;
}];
}
}
-(UIInterfaceOrientationMask)supportedInterfaceOrientations{
return UIInterfaceOrientationMaskPortrait;
}
-(BOOL)prefersStatusBarHidden{
return false;
}
@end