webview的加载

最新推荐文章于 2023-05-12 23:10:01 发布

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最新推荐文章于 2023-05-12 23:10:01 发布

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本文链接：https://blog.csdn.net/helloworld183/article/details/79015377

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该博客介绍了如何在iOS应用中使用KJWebProgressLayer来显示UIWebView的加载进度条。作者首先创建了一个UIWebView并设置其代理，然后添加了观察者以调整表格视图的头部大小以匹配WebView的内容大小。此外，还实现了 webViewDidFinishLoad 和 webViewDidFailLoadWithError 方法来完成和失败时更新进度条状态。

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#import "ViewController.h"

#import "KJWebProgressLayer.h"

@interface ViewController ()<UIWebViewDelegate,UITableViewDataSource,UITableViewDelegate>

//@property(nonatomic,strong)UITableView *

@property(nonatomic,strong)UITableView *onetableview;

@end

@implementation ViewController

{

UIWebView *_webView;

KJWebProgressLayer *_progressLayer; //载进度条

}

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

_webview = [[UIWebView alloc]initWithFrame:CGRectMake(100, 100, self.view.frame.size.width, 300)];

_webview.delegate = self;

_webview.scrollView.scrollEnabled = NO;

_webview.scrollView.showsHorizontalScrollIndicator = NO;

_webview.scrollView.bounces = NO;

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

[self.view addSubview:_webview];

NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];

NSURLRequest *request = [NSURLRequest requestWithURL:url];

[_webview loadRequest:request];

[_webview sizeToFit];

_progressLayer = [[KJWebProgressLayer alloc] initWithStrokeColor:[UIColor redColor]];

_progressLayer.frame = CGRectMake(0, 42, SCREEN_WIDTH, 2);

[self.navigationController.navigationBar.layer addSublayer:_progressLayer];

[self.view addSubview:_webView];

[_progressLayer startLoad];

_onetableview = [[UITableView alloc]initWithFrame:CGRectMake(10, 100, self.view.frame.size.width, self.view.frame.size.height) style:UITableViewStylePlain];

_onetableview.delegate = self;

_onetableview.dataSource = self;

[self.view addSubview:_onetableview];

_onetableview.tableHeaderView = _webview;

// NSURL* url = [NSURL URLWithString:@"http://www.baidu.com"];//创建URL

// NSURLRequest* request = [NSURLRequest requestWithURL:url];//创建NSURLRequest

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

// [_webview loadRequest:request];//加载

// UIButton *redbtn = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];

// redbtn.backgroundColor = [UIColor redColor];

// [self.view addSubview:redbtn];

}

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{

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

CGFloat webViewH = [[_webview stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"]floatValue]+15;

CGRect newFrame = _webview.frame;

newFrame.size.height = webViewH;

_webview.frame = newFrame;

_onetableview.tableHeaderView = _webview;

}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{

return 1;

}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

return 4;

}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

UITableViewCell *viewcell = [UITableViewCell new];

viewcell.contentView.backgroundColor = [UIColor redColor];

return viewcell;

}

//-(void)webViewDidStartLoad:(UIWebView *)webView{

//}

//-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{

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

// CGSize fittingSize = [_webview sizeThatFits:CGSizeZero];

// _webview.frame = CGRectMake(0, 200, self.view.frame.size.width, fittingSize.height);

// NSLog(@"输出_webview.frame.size.height:%f",_webview.frame.size.height);

// }

//}

-(void)webViewDidFinishLoad:(UIWebView *)webView{

[_progressLayer finishedLoad];

NSString *str = @"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '80%'";

[webView stringByEvaluatingJavaScriptFromString:str];

}

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

[_progressLayer finishedLoad];

}

- (void)dealloc {

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

[_progressLayer closeTimer];

[_progressLayer removeFromSuperlayer];

_progressLayer = nil;

}

@end