相册的实现

#import <UIKit/UIKit.h>

@class AblumView;
@protocol AblumViewDelegate <NSObject>

@optional
- (void)hiddenOrShow:(AblumView *)ablumView;

@end

@interface AblumView :
UIView <UIScrollViewDelegate>
{
   
UIScrollView *_scrollView;
   
UIImageView  *_imgView;
}

@property (nonatomic,
assign) id <AblumViewDelegate> delegate;

@property (nonatomic,
copy) NSString *url;

@property (nonatomic,
readonly) UIScrollView *scrollView;

- (void)downloadImage;

@end

#import "AblumView.h"

#import "common.h"

@implementation AblumView

-(instancetype)initWithFrame:(CGRect)frame
{
   
self=[super
initWithFrame:frame];
   
if (self) {

        

        _scrollView = [[UIScrollView
alloc] initWithFrame:CGRectMake(0, 0,
self.width,
self.height)];

        _scrollView.minimumZoomScale = 1;

        _scrollView.maximumZoomScale = 2.5;

        _scrollView.showsHorizontalScrollIndicator =
NO;

        _scrollView.showsVerticalScrollIndicator =
NO;

        _scrollView.scrollsToTop =
NO;

        _scrollView.delegate =
self;

        _scrollView.backgroundColor = [UIColor
blackColor];

        [self
addSubview:_scrollView];

        

        _imgView = [[UIImageView
alloc] initWithFrame:_scrollView.frame];

        _imgView.userInteractionEnabled =
YES;

        _imgView.contentMode =
UIViewContentModeScaleAspectFit;

        [_scrollView
addSubvi
1928e
ew:_imgView];

        

        UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer
alloc] initWithTarget:self
action:@selector(zoomOutOrIn:)];
        doubleTap.numberOfTapsRequired = 2;
        [self
addGestureRecognizer:doubleTap];

        

        UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer
alloc] initWithTarget:self
action:@selector(hiddenOrShow:)];
        [self
addGestureRecognizer:singleTap];

        

        //
双击时忽略掉单击事件
        [singleTap
requireGestureRecognizerToFail:doubleTap];
    }

    

    return
self;
}

#pragma mark - Public Method
- (void)downloadImage
{
   
if (_imgView.image ==
nil) {

        //
把图片异步请求下来

        [_imgView
setImageWithURL:[NSURL
URLWithString:_url]];
    }
}

#pragma mark - ScrollView Delegate
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
   
return _imgView    ;
}

#pragma mark - target Method
- (void)zoomOutOrIn:(UITapGestureRecognizer *)tap
{

    //
获取到用户点击位置

    CGPoint point = [tap
locationInView:_imgView];

    

    // NSLog(@"%@", NSStringFromCGPoint(point));

    

    if (_scrollView.zoomScale == 1) {

        
        [_scrollView
zoomToRect:CGRectMake(point.x-40, point.y-40, 80, 80)
animated:YES];

        
    }else {

        [_scrollView
setZoomScale:1 animated:YES];
    }
}

- (void)hiddenOrShow:(UITapGestureRecognizer *)tap
{
   
if ([self.delegate
respondsToSelector:@selector(hiddenOrShow:)]) {

        [self.delegate
hiddenOrShow:self];
    }
}

@end

#import <UIKit/UIKit.h>

#import "BaseViewController.h"

#import "AblumView.h"

@interface AblumViewController :
BaseViewController <AblumViewDelegate,
UIScrollViewDelegate>
{

@private
   
UIImageView    *_navigationBar;
   
UIScrollView   *_contentScrollView;
   
UILabel        *_titleLabel;
   
NSArray *_imagesData;
}

@end

#import "AblumViewController.h"

#import "ImageModel.h"

#import "AblumView.h"

#import "MainViewController.h"

#import "ImageModel.h"

#import "WXNetworkService.h"

#import "common.h"

#define kScrollViewGap 15

@interface
AblumViewController ()
- (void)loadNavigationBar;

- (void)loadBaseScrollView;

- (void)loadTitleView;

- (void)requestData;

- (void)refreshUI;

- (void)downloadData:(NSInteger)i;

@end

@implementation AblumViewController

- (void)viewDidLoad {

    [super
viewDidLoad];

      [self
requestData];

    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {

    [super
didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.
}

//滑动做三项事情，第一把字改了，第二把上一个相册的图的比例还原了，第三个加载图片

#pragma mark - ViewController Life
- (void)loadView
{
    [super
loadView];

    //
创建滑动视图

    [self
loadBaseScrollView];

    

    //
自定义导航栏视图

    [self
loadNavigationBar];

    

    //
创建标题视图（底部视图）

    [self
loadTitleView];
}
- (void)viewWillAppear:(BOOL)animated
{
    [super
viewWillAppear:animated];

    

    if (self.navigationController.viewControllers.count
== 2) {

        

        [self.navigationController
setNavigationBarHidden:YES
animated:YES];
    }
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super
viewWillDisappear:animated];

    

    if (self.navigationController.viewControllers.count
== 1) {

        

        [self.navigationController
setNavigationBarHidden:NO
animated:YES];

        

        MainViewController *mainVC = (MainViewController *)self.tabBarController;

        [mainVC showOrHiddenTabBarView:NO];
    }
}

#pragma mark - Private Method
- (void)loadNavigationBar
{

    _navigationBar = [[UIImageView
alloc] initWithFrame:CGRectMake(0, 0,
kDeviceWidth, 44)];

    _navigationBar.userInteractionEnabled =
YES;

    _navigationBar.image = [UIImage
imageNamed:@"nav_bg_all"];

    [self.view
addSubview:_navigationBar];

    

    UIButton *backButton = [UIButton
buttonWithType:UIButtonTypeCustom];
    backButton.frame =
CGRectMake(2, 0, 44, 44);

    [backButton setBackgroundImage:[UIImage
imageNamed:@"backItem"]
forState:UIControlStateNormal];

    [backButton addTarget:self
action:@selector(backRootVC:)
forControlEvents:UIControlEventTouchUpInside];

    [_navigationBar
addSubview:backButton];

    

    UILabel *title = [[UILabel
alloc] initWithFrame:CGRectMake(60, 0, 200, 44)];
    title.text =
@"电影图片";

    title.textAlignment =
NSTextAlignmentCenter;

    title.textColor = [UIColor
whiteColor];

    title.backgroundColor = [UIColor
clearColor];

    title.font = [UIFont
boldSystemFontOfSize:22];

    [_navigationBar
addSubview:title];
}

- (void)loadBaseScrollView
{

    _contentScrollView = [[UIScrollView
alloc] initWithFrame:CGRectMake(0, 0,
kDeviceWidth+kScrollViewGap,
kDeviceHeight-20)];

    _contentScrollView.pagingEnabled =
YES;

    _contentScrollView.delegate =
self;

   _contentScrollView.tag =
INT_MAX;

    _contentScrollView.showsHorizontalScrollIndicator =
NO;

    [self.view
addSubview:_contentScrollView];
}

- (void)loadTitleView
{

    _titleLabel = [[UILabel
alloc] initWithFrame:CGRectMake(0,
kDeviceHeight-49-20,
kDeviceWidth, 49)];

    _titleLabel.textAlignment =
NSTextAlignmentCenter;

    _titleLabel.backgroundColor = [UIColor
blackColor];

    _titleLabel.textColor = [UIColor
whiteColor];

    _titleLabel.font = [UIFont
boldSystemFontOfSize:16];

    [self.view
addSubview:_titleLabel];
}

////////////////////////////////////////////////////////////////////////

//- (void)requestData

//{

//    NSArray *data = [WXNetworkService newsImageData];

//    

//    _imagesData = [[NSMutableArray alloc] initWithCapacity:data.count];

//    for (id dic in data) {

//        

//        ImageModel *imgModel = [[ImageModel alloc] initWithContent:dic];

//        [_imagesData addObject:imgModel];

//    }

//    

//    [self refreshUI];

//}
-(void)requestData
{

    NSArray *data=[WXNetworkService
newsImageData];

    _imagesData=[[NSArray
alloc]init];

    _imagesData=[ImageModel
modelArrayWithDictArray:data];

    [self
refreshUI];
}

- (void)refreshUI
{

    //
设置滑动视图的内容大小

    _contentScrollView.contentSize =
CGSizeMake((kDeviceWidth +
kScrollViewGap) *
_imagesData.count, 0);

    

    //
设置第一个标题的内容
   
ImageModel *imageModel =
_imagesData[0];
   
_titleLabel.text = imageModel.title;

    
   
int x = 0;
   
for (int index = 0; index <
_imagesData.count; index++) {

        
       
// 取出数据
       
ImageModel *imageModel =
_imagesData[index];

        
       
// 创建视图

        AblumView *ablumView = [[AblumView
alloc] initWithFrame:CGRectMake(0+x, 0,
kDeviceWidth,
kDeviceHeight-20)];
        ablumView.tag = index;
       
if (index < 2) {

            
            ablumView.url = imageModel.url1;
            [ablumView
downloadImage];
        }
        ablumView.delegate =
self;

        [_contentScrollView
addSubview:ablumView];

        

        x += (kDeviceWidth +
kScrollViewGap);
    }
}

- (void)downloadData:(NSInteger)i
{

    AblumView *_ablumView = (AblumView *)[_contentScrollView
viewWithTag:i];
   
ImageModel *imageModel =
_imagesData[i];
    _ablumView.url = imageModel.url1;
    [_ablumView
downloadImage];
}

#pragma mark - Action Method
- (void)backRootVC:(UIButton *)button
{

    [self.navigationController
popViewControllerAnimated:YES];
}

#pragma mark - ScrollView Delegate
static
int lastIndex = 0;
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
   
int index = scrollView.contentOffset.x / (kDeviceWidth+kScrollViewGap);

    
   
if (index >= _imagesData.count || index < 0) {
       
return;
    }

    

    //
设置标题
   
ImageModel *imageModel =
_imagesData[index];
   
_titleLabel.text = imageModel.title;

    

    //
还原上一个视图比例

    AblumView *ablumView = (AblumView *)[_contentScrollView
viewWithTag:lastIndex];
   
if (ablumView.scrollView.zoomScale >= 1 &&
lastIndex != index) {

        
        ablumView.scrollView.zoomScale = 1;
    }

    
   
if (index == 0) {

        // ... noting 2张图片（1， 2）
       
for (int i = 0; i <= index+1; i++) {

            // NSLog(@"before : %d", i);

            
        }

        
    }else
if (index == _imagesData.count-1) {

        // 2张图片（最后一张和倒数第二章）
       
for (int i = index; i >= index-1; i--) {
           
NSLog(@"end :i : %d", i);
            [self
downloadData:i];
        }
    }else {
       
// 3 4 5
       
for (int i = index+1; i >= index-1; i--) {
           
NSLog(@"middle : %d", i);
            [self
downloadData:i];
        }
    }

    
   
lastIndex = index;
}

#pragma mark - AblumView Delegate
- (void)hiddenOrShow:(AblumView *)ablumView
{

    [UIView
beginAnimations:nil
context:NULL];

    [UIView
setAnimationDuration:0.35];

    if (_navigationBar.alpha == 1 &&
_titleLabel.alpha == 1) {

        _navigationBar.alpha = 0;

        _titleLabel.alpha = 0;
    }else {

        _navigationBar.alpha = 1;

        _titleLabel.alpha = 1;
    }

    [UIView
commitAnimations];
}

@end