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：
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// 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;
}
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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：
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// 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"
];
}
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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：
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// 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：
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......
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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：
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- (
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
});
});
});
}
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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
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#
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
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ProductLoadMorePicTextView.m
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#
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:@
""
];
[html appendString:@
""
];
[html appendString:@
""
];
[html appendString:[self settingWebViewBodyWithImageUrlArray:imageUrls]];
[html appendString:@
""
];
[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。
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#
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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