tableHeaderView上加载wkwebView作为头部视图并更新高度
//
// ViewController.m
// WKWebViewDemo
//
// Created by Mac xk on 2019/10/25.
// Copyright © 2019 Mac xk. All rights reserved.
//
#import "ViewController.h"
#import <WebKit/WebKit.h>
#import "XKInformationHeaderView.h"
@interface ViewController ()<WKNavigationDelegate>
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (strong, nonatomic)XKInformationHeaderView *headView;
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *tabHeightCons;
@end
@implementation ViewController
-(XKInformationHeaderView *)headView{
if (!_headView) {
_headView=[[[NSBundle mainBundle]loadNibNamed:@"XKInformationHeaderView" owner:self options:nil]firstObject];
_headView.frame = [UIScreen mainScreen].bounds;
}
return _headView;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.tableView.tableHeaderView = self.headView;
self.headView.webHeightBlock = ^(CGFloat webH) {
self.tabHeightCons.constant = webH+80+(([UIScreen mainScreen].bounds.size.width-22)*240/353);
// self.headView.frame.size.height = self.tabHeightCons.constant;
[self.tableView beginUpdates];
[self.tableView setTableHeaderView:self.headView] ;
[self.tableView endUpdates];
};
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 0;
}
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return 0.01;
}
-(CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
return 0.01;
}
- (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 0.01;
}
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellID = @"topicCellId";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
if (!cell ) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
}
return cell;
}
@end
tableHeaderView类
精准计算WKWebView中html内容高度的方法
#import <UIKit/UIKit.h>
NS_ASSUME_NONNULL_BEGIN
@interface XKInformationHeaderView : UIView
@property (weak, nonatomic) IBOutlet UIImageView *imgView;
@property (assign, nonatomic)CGFloat headerHeight;
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *webVHeightCons;
@property(copy,nonatomic)void(^webHeightBlock)(CGFloat);
@end
NS_ASSUME_NONNULL_END
//
// XKInformationHeaderView.m
// eResidents
//
// Created by Mac xk on 2019/9/17.
// Copyright © 2019 Jon Shi. All rights reserved.
//
#import "XKInformationHeaderView.h"
#import <WebKit/WebKit.h>
@interface XKInformationHeaderView ()
@property (weak, nonatomic) IBOutlet UIView *imgV;
@property (weak, nonatomic) IBOutlet UILabel *titleLab;
@property (weak, nonatomic) IBOutlet UILabel *readLab;
@property (weak, nonatomic) IBOutlet UILabel *contentlab;
@property (weak, nonatomic) IBOutlet UIButton *shoucangBtn;
@property (weak, nonatomic) IBOutlet UILabel *timeLab;
@property (strong, nonatomic) WKWebView *contenWebV;
@property (weak, nonatomic) IBOutlet UIView *backV;
@end
@implementation XKInformationHeaderView
-(void)awakeFromNib
{
[super awakeFromNib];
WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc]init];
WKPreferences *preferences = [[WKPreferences alloc]init];
preferences.javaScriptCanOpenWindowsAutomatically = true;
// 图片自适应高度
NSString *jSString = @"var objs = document.getElementsByTagName('img');for(var i=0;i++){var img = objs[i];img.style.maxWidth = '100%';img.style.height='auto';}";
WKUserScript *wkUserScript = [[WKUserScript alloc]initWithSource:jSString injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
// 修改文字大小
NSString*jScript =@"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";
WKUserScript *wkScript = [[WKUserScript alloc]initWithSource:jScript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
WKUserContentController *ucontroller = [[WKUserContentController alloc]init];
[ucontroller addUserScript:wkUserScript];
[ucontroller addUserScript:wkScript];
configuration.preferences = preferences;
WKWebView *wkWebView = [[WKWebView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, [UIScreen mainScreen].bounds.size.width, 0) configuration:configuration];
NSString * htmlString = @"<p style=\"white-space: normal; text-align: center;\"><img src=\"http://main.xiekang.net/Scripts/ueditor1_4_3_3-utf8-net/utf8-net/net/upload/image/20180228/6365541345806039683723703.jpg\" title=\"1.jpg\" alt=\"1.jpg\"/></p><p style=\"white-space: normal;\"><img src=\"http://main.xiekang.net/Scripts/ueditor1_4_3_3-utf8-net/utf8-net/net/upload/image/20180228/6365541346671664682702027.jpg\" title=\"2.jpg\" alt=\"2.jpg\"/></p><p style=\"white-space: normal;\"><img src=\"http://main.xiekang.net/Scripts/ueditor1_4_3_3-utf8-net/utf8-net/net/upload/image/20180228/6365541348234164683642219.jpg\" title=\"3.jpg\" alt=\"3.jpg\"/></p><p style=\"white-space: normal;\"><img src=\"http://main.xiekang.net/Scripts/ueditor1_4_3_3-utf8-net/utf8-net/net/upload/image/20180228/6365541349057602186791886.jpg\" title=\"4.jpg\" alt=\"4.jpg\"/></p><p style=\"white-space: normal;\"><img src=\"http://main.xiekang.net/Scripts/ueditor1_4_3_3-utf8-net/utf8-net/net/upload/image/20180228/6365541349673227181637951.jpg\" title=\"5.jpg\" alt=\"5.jpg\"/></p><p><br/></p>";
wkWebView.scrollView.bounces = NO;
wkWebView.navigationDelegate = self;
[wkWebView loadHTMLString:[self setAttributedString:htmlString].string baseURL:nil];
[self.backV addSubview:wkWebView];
}
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation {
[webView evaluateJavaScript:@"document.body.scrollHeight" completionHandler:^(id _Nullable result,NSError *_Nullable error) {
//获取页面高度
CGFloat height = [result doubleValue];
NSLog(@"scrollHeight 即为所求：%f",height);
webView.frame = CGRectMake(0, 91, [UIScreen mainScreen].bounds.size.width-22, height);
self.webVHeightCons.constant = height;
self.headerHeight = self.webVHeightCons.constant;
if (self.webHeightBlock) {
self.webHeightBlock(self.webVHeightCons.constant);
}
[self layoutIfNeeded];
[self setNeedsLayout];
}];
}
-(NSMutableAttributedString *)setAttributedString:(NSString *)str
{
//如果有换行，把\n替换成<br/>
//如果有需要把换行加上
str = [str stringByReplacingOccurrencesOfString:@"\n" withString:@"<br/>"];
//设置HTML图片的宽度
str = [NSString stringWithFormat:@"<head><style>img{width:%f !important;height:auto}</style></head>%@",[UIScreen mainScreen].bounds.size.width,str];
NSMutableAttributedString *htmlString =[[NSMutableAttributedString alloc] initWithData:[str dataUsingEncoding:NSUTF8StringEncoding] options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute:[NSNumber numberWithInt:NSUTF8StringEncoding]} documentAttributes:NULL error:nil];
// //设置富文本字的大小
// [htmlString addAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:16]} range:NSMakeRange(0, htmlString.length)];
// //设置行间距
// NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
// [paragraphStyle setLineSpacing:5];
// [htmlString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [htmlString length])];
return htmlString;
}
//-(void)setModel:(XKInfoEntityMod *)model
//{
// _model = model;
// self.titleLab.text = model.wikiName;
// CGRect frame = CGRectMake(0, 91, KScreenWidth-22,0);
// frame.size.height = 0;
// self.contenWebV.frame = frame;
// [self.contenWebV loadHTMLString:[self setAttributedString:model.content].string baseURL:nil];
//
//}
- (IBAction)soucangAction:(id)sender {
}
@end
