iOS中UIScrollView、UIWebView、UICollectionView实现图文混排

问题汇总

1、如何实现JavaScript与Objective-C间传值？

点击Webview中的图片，放大，需要JavaScript和Objective-C传值，获取到具体需要放大哪张图片。

本方案中，不需要引入WebViewJavascriptBridge，而是通过【控制Webview重定向方法，拦截发出的请求】来实现。

示例：

// 每个添加点击事件(window.location.href)，其中selectIndex为图片标识// webview发起请求拦截

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{

// 获取img标识index

NSString *url = request.URL.absoluteString;

NSRange range = [url rangeOfString:@"selectIndex="];

if (range.location != NSNotFound) {

NSInteger begin = range.location + range.length;

NSString *index = [url substringFromIndex:begin];

NSLog(@"img: %@", index);

return NO;

}

return YES;

}

2、如何实现UIWebView高度自适应？

UIWebView自适应高度的方案有很多，选择一个较为科学的方式，显得尤为重要。

本方案中，通过【KVO监听Webview的contentSize】来实现，需要注意KVO的添加、移除，稍有不慎有Crash风险。

示例：

// 添加监听

[self.webView.scrollView addObserver:self forKeyPath:@"contentSize" options:NSKeyValueObservingOptionNew context:nil];

- (UIWebView *)webView

{

if (!_webView) {

_webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];

_webView.delegate = self;

_webView.scrollView.bounces = NO;

_webView.scrollView.showsHorizontalScrollIndicator = NO;

_webView.scrollView.scrollEnabled = NO;

_webView.scalesPageToFit = YES;

}

return _webView;

}

// 修改webview的frame

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context

{

if ([keyPath isEqualToString:@"contentSize"]) {

CGSize resize = [self.webView sizeThatFits:CGSizeZero];

self.webView.frame = CGRectMake(0, 0, CGRectGetWidth(self.frame), resize.height);

}

// 移除监听

-(void)dealloc

{

[self.webView.scrollView removeObserver:self forKeyPath:@"contentSize"];

}

3、如何实现UIWebView显示webp格式图片？

UIWebView、WKWebview本身都不支持webp格式图片，需要额外扩展。

示例：

// 导入头文件

#import // 注册 MagicURLProtocol

[[MagicWebViewWebPManager shareManager] registerMagicURLProtocolWebView:self.webView];

// 销毁 MagicURLProtocol

-(void)dealloc

{

[[MagicWebViewWebPManager shareManager] unregisterMagicURLProtocolWebView:self.webView];

}

4、如何实现图文混排 + UIKit组件？

使用UIWebView加载自定义HTML代码的方式，实现图文混排。

点击图片，放大，function()跳转链接，携带selectIndex标识，通过拦截UIWebView的请求来获取selectIndex标识。

通过KVO获取到WebView高度，重新设置webView.frame，collectionView.frame，scrollView.contentSize

本方案中，图文混排+UIKit组件，具体逻辑如下：

5、如何自定义HTML代码？

本方案中，以纯图片为例，处理后的HTML如下：

......

6、如何实现并发执行多个网络请求，统一处理？

本方案中，利用GCD创建队列组，提交多个任务到队列组，多个任务同时执行，监听队列组执行完毕，在主线程刷新UI。

注意：dispatch_group_enter() 、 dispatch_group_leave()将队列组中的任务未执行完毕的任务数目加减1（两个函数要配合使用）

示例：

- (void)exampleMoreNetwork{

dispatch_group_t group = dispatch_group_create();

dispatch_queue_t serialQueue = dispatch_queue_create("magic_gcd_group", DISPATCH_QUEUE_SERIAL);

// 网络请求1

dispatch_group_enter(group);

dispatch_group_async(group, serialQueue, ^{

[[MagicNetworkManager shareManager] GET:@"网络请求1" Parameters:nil Success:^(NSURLResponse *response, id responseObject) {

dispatch_group_leave(group);

} Failure:^(NSURLResponse *response, id error) {

dispatch_group_leave(group);

}];

});

// 网络请求2

dispatch_group_enter(group);

dispatch_group_async(group, serialQueue, ^{

[[MagicNetworkManager shareManager] GET:@"网络请求2" Parameters:nil Success:^(NSURLResponse *response, id responseObject) {

dispatch_group_leave(group);

} Failure:^(NSURLResponse *response, id error) {

dispatch_group_leave(group);

}];

});

// 所有网络请求结束

dispatch_group_notify(group, serialQueue, ^{

dispatch_async(dispatch_get_global_queue(0, 0), ^{

dispatch_async(dispatch_get_main_queue(), ^{

// 主线程刷新UI

});

}

图文混排——核心

目录结构

实现代理方法，放大图片，跳转商品，置顶。

实现针对showjoy.com域名，图片url拼接.webp。

实现UIScrollView作为根容器，自适应内容高度。

实现UIWebView支持webp格式图片。

实现自定义HTML代码，图片居中，window.location.href事件传递selectIndex，UIWebView代理拦截selectIndex。

通过HTML，JavaScript，还可以实现更多功能。。。。。。

ProductLoadMorePicTextView.h

#import #import "ProductDetailModel.h"

#import "ProductLoadMorePicTextModel.h"

@protocol ProductLoadMorePicTextViewDelegate - (void)productLoadMorePicTextViewZoomImageWithIndex:(NSInteger)index;

- (void)productLoadMorePicTextViewPushProductWithSkuId:(NSString *)skuId;

- (void)productLoadMorePicTextViewGoTop;

@end

@interface ProductLoadMorePicTextView : UIView

@property (nonatomic, weak) id delegate;

- (instancetype)initWithFrame:(CGRect)frame productDetailModel:(ProductDetailModel *)productDetailModel picTextModel:(ProductLoadMorePicTextModel *)picTextModel;

- (void)reload;

@end

ProductLoadMorePicTextView.m

#import "ProductLoadMorePicTextView.h"

#import "ProductLoadMorePicTextCollectionViewCell.h"

#import "MagicScrollPageRefreshHeader.h"

#import static const CGFloat recommendViewHeight = 170.0;

static const CGFloat recommendViewSpace = 10.0;

static const CGFloat recommendItemWidth = 105.0;

static const CGFloat recommendItemSpace = 5.0;

static const CGFloat recommendTitleHeight = 40.0;

@interface ProductLoadMorePicTextView ()@property (nonatomic, strong) UIScrollView *scrollView;

@property (nonatomic, strong) UIWebView *webView;

@property (nonatomic, strong) UICollectionView *collectionView;

@property (nonatomic, strong) UILabel *recommendLabel;

@property (nonatomic, strong) NSMutableArray *recommendDataArray;

@property (nonatomic, strong) NSMutableArray *picTextDataArray;

@end

@implementation ProductLoadMorePicTextView

- (instancetype)initWithFrame:(CGRect)frame productDetailModel:(ProductDetailModel *)productDetailModel picTextModel:(ProductLoadMorePicTextModel *)picTextModel

{

self = [super initWithFrame:frame];

if (self) {

self.recommendDataArray = [NSMutableArray arrayWithArray:productDetailModel.recommend];

self.picTextDataArray = [NSMutableArray arrayWithArray:picTextModel.itemPic.packageImages];

[self createSubViewsWithPicTextModel:picTextModel];

}

return self;

}

- (void)createSubViewsWithPicTextModel:(ProductLoadMorePicTextModel *)picTextModel

{

[self addSubview:self.scrollView];

[[MagicWebViewWebPManager shareManager] registerMagicURLProtocolWebView:self.webView];

[self.scrollView addSubview:self.webView];

[self.scrollView addSubview:self.recommendLabel];

[self.scrollView addSubview:self.collectionView];

[self.webView.scrollView addObserver:self forKeyPath:@"contentSize" options:NSKeyValueObservingOptionNew context:nil];

MC_SELF_WEAK(self)

MagicScrollPageRefreshHeader *header = [MagicScrollPageRefreshHeader headerWithRefreshingBlock:^{

[weakself.scrollView.mj_header endRefreshing];

[weakself executeProductLoadMorePicTextViewGoTop];

}];

self.scrollView.mj_header = header;

}

#pragma mark -Lazy

- (UIScrollView *)scrollView

{

if (!_scrollView) {

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

_scrollView.backgroundColor = [UIColor colorWithRed:0.95 green:0.95 blue:0.95 alpha:1.00];

}

return _scrollView;

}

- (UIWebView *)webView

{

if (!_webView) {

_webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];

_webView.delegate = self;

_webView.scrollView.bounces = NO;

_webView.scrollView.showsHorizontalScrollIndicator = NO;

_webView.scrollView.scrollEnabled = NO;

_webView.scalesPageToFit = YES;

}

return _webView;

}

- (UILabel *)recommendLabel{

if (!_recommendLabel) {

_recommendLabel = [[UILabel alloc] init];

_recommendLabel.text = @" 更多推荐";

_recommendLabel.textColor = [UIColor colorWithRed:0.30 green:0.30 blue:0.30 alpha:1.00];

_recommendLabel.font = [UIFont systemFontOfSize:12];

_recommendLabel.backgroundColor = [UIColor whiteColor];

}

return _recommendLabel;

}

- (UICollectionView *)collectionView

{

if (!_collectionView) {

UICollectionViewFlowLayout *flowLayout = [UICollectionViewFlowLayout new];

flowLayout.sectionInset = UIEdgeInsetsMake(0, 0, 0, recommendItemSpace);

flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;

flowLayout.itemSize = CGSizeMake(recommendItemWidth, recommendViewHeight);

_collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:flowLayout];

_collectionView.backgroundColor = [UIColor whiteColor];

_collectionView.delegate = self;

_collectionView.dataSource = self;

[_collectionView registerClass:[ProductLoadMorePicTextCollectionViewCell class] forCellWithReuseIdentifier:@"cell"];

}

return _collectionView;

}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context

{

if ([keyPath isEqualToString:@"contentSize"]) {

CGSize resize = [self.webView sizeThatFits:CGSizeZero];

self.webView.frame = CGRectMake(0, 0, CGRectGetWidth(self.frame), resize.height);

self.recommendLabel.frame = CGRectMake(0, CGRectGetMaxY(self.webView.frame) + recommendViewSpace, CGRectGetWidth(self.frame), recommendTitleHeight);

self.collectionView.frame = CGRectMake(0, CGRectGetMaxY(self.recommendLabel.frame), CGRectGetWidth(self.frame), recommendViewHeight);

self.scrollView.contentSize = CGSizeMake(CGRectGetWidth(self.frame), CGRectGetMaxY(self.collectionView.frame) + recommendViewSpace);

}

-(void)dealloc

{

[[MagicWebViewWebPManager shareManager] unregisterMagicURLProtocolWebView:self.webView];

[self.webView.scrollView removeObserver:self forKeyPath:@"contentSize"];

self.scrollView = nil;

self.webView = nil;

self.collectionView = nil;

self.recommendDataArray = nil;

self.picTextDataArray = nil;

}

#pragma mark - UIWebViewDelegate

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{

return [self handleWebviewEventWithRequest:request];

}

- (void)webViewDidStartLoad:(UIWebView *)webView

{

}

- (void)webViewDidFinishLoad:(UIWebView *)webView

{

}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error

{

NSLog(@"商品详情web错误 %@", error);

}

- (BOOL)handleWebviewEventWithRequest:(NSURLRequest *)request

{

NSString *url = request.URL.absoluteString;

NSRange range = [url rangeOfString:@"selectIndex="];

if (range.location != NSNotFound) {

NSInteger begin = range.location + range.length;

NSString *index = [url substringFromIndex:begin];

[self executeProductLoadMorePicTextViewZoomImageWithIndexString:index];

return NO;

}

return YES;

}

#pragma mark - CustomHTML

- (void)loadWebViewCustomHTMLWithImageUrls:(NSArray *)imageUrls

{

NSMutableString *html = [NSMutableString string];

[html appendString:@""];

[html appendString:[self settingWebViewBodyWithImageUrlArray:imageUrls]];

[html appendString:@""];

[self.webView loadHTMLString:html baseURL:nil];

}

- (NSString *)settingWebViewBodyWithImageUrlArray:(NSArray *)imageUrlArray

{

NSMutableString *body = [NSMutableString string];

for (NSInteger i = 0; i < imageUrlArray.count; i++) {

NSString *imgUrl = [NSString stringWithFormat:@"%@", [imageUrlArray objectAtIndex:i]];

imgUrl = [self handlerImgUrlString:imgUrl];

NSMutableString *html = [NSMutableString string];

[html appendString:@""];

NSString *onload = [NSString stringWithFormat:@"this.onclick = function() {window.location.href = 'selectIndex=' + %ld;}", i];

[html appendFormat:@"", onload, imgUrl];

[html appendString:@""];

[body appendString:html];

}

return body;

}

#pragma mark -UICollectionViewDataSource

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{

return self.recommendDataArray.count;

}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{

ProductLoadMorePicTextCollectionViewCell *cell = (ProductLoadMorePicTextCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];

cell.productRecommendModel = [self.recommendDataArray objectAtIndex:indexPath.row];

return cell;

}

#pragma mark -UICollectionViewDelegate

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{

ProductRecommend *productRecommendModel = [self.recommendDataArray objectAtIndex:indexPath.row];

[self executeProductLoadMorePicTextViewPushProductWithSkuId:productRecommendModel.ID];

}

#pragma mark -ProductLoadMoreViewDelegate

- (void)executeProductLoadMorePicTextViewZoomImageWithIndexString:(NSString *)indexString

{

if ([self.delegate respondsToSelector:@selector(productLoadMorePicTextViewZoomImageWithIndex:)]) {

[self.delegate productLoadMorePicTextViewZoomImageWithIndex:[indexString integerValue]];

}

- (void)executeProductLoadMorePicTextViewPushProductWithSkuId:(NSInteger)skuId

{

if ([self.delegate respondsToSelector:@selector(productLoadMorePicTextViewPushProductWithSkuId:)]) {

[self.delegate productLoadMorePicTextViewPushProductWithSkuId:[NSString stringWithFormat:@"%ld", skuId]];

}

- (void)executeProductLoadMorePicTextViewGoTop

{

if ([self.delegate respondsToSelector:@selector(productLoadMorePicTextViewGoTop)]) {

[self.delegate productLoadMorePicTextViewGoTop];

}

#pragma mark - Reload

- (void)reload{

[self loadWebViewCustomHTMLWithImageUrls:self.picTextDataArray];

[self.collectionView reloadData];

}

#pragma mark - IMGURL

- (NSString *)handlerImgUrlString:(NSString *)imgUrlString

{

NSString *result = [NetworkManager httpsSchemeHandler:imgUrlString];

// webp

if ([result containsString:@"showjoy.com"] && ![result hasSuffix:@".webp"]) {

result = [result stringByAppendingString:@".webp"];

}

return result;

}

@end

图文混排——使用

ProductLoadMoreViewController中，保证两个接口都请求完成后，刷新ProductLoadMorePicTextView。

#import "ProductLoadMoreViewController.h"

#import "MagicNetworkManager.h"

#import "ProductLoadMorePicTextView.h"

static NSString * const SJProductAPI = @"https://shopappserver.showjoy.com/api/shop/sku";

static NSString * const SJProductPicTextAPI = @"https://shopappserver.showjoy.com/api/shop/item/pictext";

static NSString * const SJProductSkuId = @"146931";

@interface ProductLoadMoreViewController () @end

@implementation ProductLoadMoreViewController{

ProductDetailModel *_productModel;

ProductLoadMorePicTextModel *_productPicTextModel;

ProductLoadMorePicTextView *_picTextView;

}

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view.

self.view.backgroundColor = [UIColor grayColor];

[self networkRequestData];

}

#pragma mark - Network

- (void)networkRequestData

{

[QuicklyHUD showWindowsProgressHUDText:@"加载中..."];

dispatch_group_t group = dispatch_group_create();

dispatch_queue_t serialQueue = dispatch_queue_create("product_group", DISPATCH_QUEUE_SERIAL);

// 商品信息

dispatch_group_enter(group);

dispatch_group_async(group, serialQueue, ^{

[[MagicNetworkManager shareManager] GET:SJProductAPI Parameters:@{@"skuId" : SJProductSkuId} Success:^(NSURLResponse *response, id responseObject) {

[ProductDetailModel mj_setupObjectClassInArray:^NSDictionary *{

return @{@"shop" : [ProductShop class],

@"skuList" : [ProductSkuList class],

@"value" : [ProductValue class],

@"saleInfo" : [ProductSaleInfo class],

@"recommend" : [ProductRecommend class],

@"skuCommission" : [ProductSkuCommission class],

@"item" : [ProductItem class],

@"tagSkus" : [ProductTagSkus class],

@"tagMap" : [ProductTagMap class],

@"skuEnsures" : [ProductSkuEnsures class],

@"salesPromotion" : [ProductSalesPromotion class]};

}];

_productModel = [ProductDetailModel mj_objectWithKeyValues:[responseObject valueForKey:@"data"]];

dispatch_group_leave(group);

} Failure:^(NSURLResponse *response, id error) {

dispatch_group_leave(group);

}];

});

// 图文信息

dispatch_group_enter(group);

dispatch_group_async(group, serialQueue, ^{

[[MagicNetworkManager shareManager] GET:SJProductPicTextAPI Parameters:@{@"skuId" : SJProductSkuId} Success:^(NSURLResponse *response, id responseObject) {

[ProductLoadMorePicTextModel mj_setupObjectClassInArray:^NSDictionary *{

return @{@"item" : [PicTextItem class],

@"itemPic" : [PicTextItemPic class],

@"spu" : [PicTextSpu class]};

}];

_productPicTextModel = [ProductLoadMorePicTextModel mj_objectWithKeyValues:[responseObject valueForKey:@"data"]];

dispatch_group_leave(group);

} Failure:^(NSURLResponse *response, id error) {

dispatch_group_leave(group);

}];

});

// 主线程刷新UI

dispatch_group_notify(group, serialQueue, ^{

dispatch_async(dispatch_get_global_queue(0, 0), ^{

dispatch_async(dispatch_get_main_queue(), ^{

[QuicklyHUD hiddenMBProgressHUDForView:MC_APP_WINDOW];

[self reloadPicTextView];

});

}

#pragma mark - Reload

- (void)reloadPicTextView

{

if (_picTextView) {

[_picTextView removeFromSuperview];

_picTextView.delegate = nil;

_picTextView = nil;

}

CGFloat border = 20.0f;

_picTextView = [[ProductLoadMorePicTextView alloc] initWithFrame:CGRectMake(border, border, MC_SCREEN_W - 2 * border, MC_SCREEN_H - MC_NAVIGATION_BAR_H - MC_STATUS_BAR_H - 2 * border) productDetailModel:_productModel picTextModel:_productPicTextModel];

_picTextView.delegate = self;

[self.view addSubview:_picTextView];

[_picTextView reload];

}

#pragma mark - ProductLoadMorePicTextViewDelegate

- (void)productLoadMorePicTextViewGoTop

{

[QuicklyHUD showWindowsOnlyTextHUDText:@"Go Top"];

}

- (void)productLoadMorePicTextViewZoomImageWithIndex:(NSInteger)index

{

[QuicklyHUD showWindowsOnlyTextHUDText:[NSString stringWithFormat:@"img: %ld", index]];

}

- (void)productLoadMorePicTextViewPushProductWithSkuId:(NSString *)skuId

{

[QuicklyHUD showWindowsOnlyTextHUDText:[NSString stringWithFormat:@"skuId: %@", skuId]];

}

@end

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